diff --git a/cl/_testdata/print/out.ll b/cl/_testdata/print/out.ll
index 0e4003b5..3288ef27 100644
--- a/cl/_testdata/print/out.ll
+++ b/cl/_testdata/print/out.ll
@@ -5,7 +5,7 @@ source_filename = "main"
 %"github.com/goplus/llgo/internal/runtime.String" = type { ptr, i64 }
 %main.stringStruct = type { ptr, i64 }
 %main.slice = type { ptr, i64, i64 }
-%"github.com/goplus/llgo/internal/runtime.iface" = type { ptr, ptr }
+%"github.com/goplus/llgo/internal/runtime.eface" = type { ptr, ptr }
 
 @"main.init$guard" = global ptr null
 @main.minhexdigits = global ptr null
@@ -104,127 +104,251 @@ _llgo_0:
   call void @main.prinfsub(double 1.001000e+02)
   call void @main.printnl()
   %6 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 13)
-  %7 = call %"github.com/goplus/llgo/internal/runtime.iface" @"github.com/goplus/llgo/internal/runtime.MakeAnyIntptr"(ptr %6, i64 1315859240)
-  call void @main.printany(%"github.com/goplus/llgo/internal/runtime.iface" %7)
+  %7 = alloca %"github.com/goplus/llgo/internal/runtime.eface", align 8
+  %8 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %7, i32 0, i32 0
+  store ptr %6, ptr %8, align 8
+  %9 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %7, i32 0, i32 1
+  store ptr inttoptr (i32 1315859240 to ptr), ptr %9, align 8
+  %10 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %7, align 8
+  call void @main.printany(%"github.com/goplus/llgo/internal/runtime.eface" %10)
   call void @main.printnl()
-  %8 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 14)
-  %9 = call %"github.com/goplus/llgo/internal/runtime.iface" @"github.com/goplus/llgo/internal/runtime.MakeAnyIntptr"(ptr %8, i64 4746175415993761792)
-  call void @main.printany(%"github.com/goplus/llgo/internal/runtime.iface" %9)
+  %11 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 14)
+  %12 = alloca %"github.com/goplus/llgo/internal/runtime.eface", align 8
+  %13 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %12, i32 0, i32 0
+  store ptr %11, ptr %13, align 8
+  %14 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %12, i32 0, i32 1
+  store ptr inttoptr (i64 4746175415993761792 to ptr), ptr %14, align 8
+  %15 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %12, align 8
+  call void @main.printany(%"github.com/goplus/llgo/internal/runtime.eface" %15)
   call void @main.printnl()
   br i1 true, label %_llgo_3, label %_llgo_2
 
 _llgo_1:                                          ; preds = %_llgo_3
-  %10 = call ptr @"github.com/goplus/llgo/internal/runtime.AllocZ"(i64 32)
-  %11 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.iface", ptr %10, i64 0
-  %12 = alloca %"github.com/goplus/llgo/internal/runtime.String", align 8
-  %13 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %12, i32 0, i32 0
-  store ptr @2, ptr %13, align 8
-  %14 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %12, i32 0, i32 1
-  store i64 10, ptr %14, align 4
-  %15 = load %"github.com/goplus/llgo/internal/runtime.String", ptr %12, align 8
-  %16 = call %"github.com/goplus/llgo/internal/runtime.iface" @"github.com/goplus/llgo/internal/runtime.MakeAnyString"(%"github.com/goplus/llgo/internal/runtime.String" %15)
-  store %"github.com/goplus/llgo/internal/runtime.iface" %16, ptr %11, align 8
-  %17 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.iface", ptr %10, i64 1
-  %18 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 1)
-  %19 = call %"github.com/goplus/llgo/internal/runtime.iface" @"github.com/goplus/llgo/internal/runtime.MakeAnyIntptr"(ptr %18, i64 -1)
-  store %"github.com/goplus/llgo/internal/runtime.iface" %19, ptr %17, align 8
-  %20 = call %"github.com/goplus/llgo/internal/runtime.Slice" @"github.com/goplus/llgo/internal/runtime.NewSlice3"(ptr %10, i64 16, i64 2, i64 0, i64 2, i64 2)
-  call void @main.println(%"github.com/goplus/llgo/internal/runtime.Slice" %20)
+  %16 = call ptr @"github.com/goplus/llgo/internal/runtime.AllocZ"(i64 32)
+  %17 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %16, i64 0
+  %18 = alloca %"github.com/goplus/llgo/internal/runtime.String", align 8
+  %19 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %18, i32 0, i32 0
+  store ptr @2, ptr %19, align 8
+  %20 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %18, i32 0, i32 1
+  store i64 10, ptr %20, align 4
+  %21 = load %"github.com/goplus/llgo/internal/runtime.String", ptr %18, align 8
+  %22 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 24)
+  %23 = call ptr @"github.com/goplus/llgo/internal/runtime.AllocU"(i64 16)
+  store %"github.com/goplus/llgo/internal/runtime.String" %21, ptr %23, align 8
+  %24 = alloca %"github.com/goplus/llgo/internal/runtime.eface", align 8
+  %25 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %24, i32 0, i32 0
+  store ptr %22, ptr %25, align 8
+  %26 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %24, i32 0, i32 1
+  store ptr %23, ptr %26, align 8
+  %27 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %24, align 8
+  store %"github.com/goplus/llgo/internal/runtime.eface" %27, ptr %17, align 8
+  %28 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %16, i64 1
+  %29 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 1)
+  %30 = alloca %"github.com/goplus/llgo/internal/runtime.eface", align 8
+  %31 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %30, i32 0, i32 0
+  store ptr %29, ptr %31, align 8
+  %32 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %30, i32 0, i32 1
+  store ptr inttoptr (i64 -1 to ptr), ptr %32, align 8
+  %33 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %30, align 8
+  store %"github.com/goplus/llgo/internal/runtime.eface" %33, ptr %28, align 8
+  %34 = call %"github.com/goplus/llgo/internal/runtime.Slice" @"github.com/goplus/llgo/internal/runtime.NewSlice3"(ptr %16, i64 16, i64 2, i64 0, i64 2, i64 2)
+  call void @main.println(%"github.com/goplus/llgo/internal/runtime.Slice" %34)
   br label %_llgo_2
 
 _llgo_2:                                          ; preds = %_llgo_3, %_llgo_1, %_llgo_0
-  %21 = call ptr @"github.com/goplus/llgo/internal/runtime.AllocZ"(i64 48)
-  %22 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.iface", ptr %21, i64 0
-  %23 = alloca %"github.com/goplus/llgo/internal/runtime.String", align 8
-  %24 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %23, i32 0, i32 0
-  store ptr @3, ptr %24, align 8
-  %25 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %23, i32 0, i32 1
-  store i64 8, ptr %25, align 4
-  %26 = load %"github.com/goplus/llgo/internal/runtime.String", ptr %23, align 8
-  %27 = call %"github.com/goplus/llgo/internal/runtime.iface" @"github.com/goplus/llgo/internal/runtime.MakeAnyString"(%"github.com/goplus/llgo/internal/runtime.String" %26)
-  store %"github.com/goplus/llgo/internal/runtime.iface" %27, ptr %22, align 8
-  %28 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.iface", ptr %21, i64 1
-  %29 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 1)
-  %30 = call %"github.com/goplus/llgo/internal/runtime.iface" @"github.com/goplus/llgo/internal/runtime.MakeAnyIntptr"(ptr %29, i64 -1)
-  store %"github.com/goplus/llgo/internal/runtime.iface" %30, ptr %28, align 8
-  %31 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.iface", ptr %21, i64 2
-  %32 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 1)
-  %33 = call %"github.com/goplus/llgo/internal/runtime.iface" @"github.com/goplus/llgo/internal/runtime.MakeAnyIntptr"(ptr %32, i64 -1)
-  store %"github.com/goplus/llgo/internal/runtime.iface" %33, ptr %31, align 8
-  %34 = call %"github.com/goplus/llgo/internal/runtime.Slice" @"github.com/goplus/llgo/internal/runtime.NewSlice3"(ptr %21, i64 16, i64 3, i64 0, i64 3, i64 3)
-  call void @main.println(%"github.com/goplus/llgo/internal/runtime.Slice" %34)
-  %35 = call ptr @"github.com/goplus/llgo/internal/runtime.AllocZ"(i64 256)
-  %36 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.iface", ptr %35, i64 0
-  %37 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 1)
-  %38 = call %"github.com/goplus/llgo/internal/runtime.iface" @"github.com/goplus/llgo/internal/runtime.MakeAnyIntptr"(ptr %37, i64 -1)
-  store %"github.com/goplus/llgo/internal/runtime.iface" %38, ptr %36, align 8
-  %39 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.iface", ptr %35, i64 1
-  %40 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 1)
-  %41 = call %"github.com/goplus/llgo/internal/runtime.iface" @"github.com/goplus/llgo/internal/runtime.MakeAnyIntptr"(ptr %40, i64 0)
-  store %"github.com/goplus/llgo/internal/runtime.iface" %41, ptr %39, align 8
-  %42 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.iface", ptr %35, i64 2
-  %43 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 5)
-  %44 = call %"github.com/goplus/llgo/internal/runtime.iface" @"github.com/goplus/llgo/internal/runtime.MakeAnyIntptr"(ptr %43, i64 97)
-  store %"github.com/goplus/llgo/internal/runtime.iface" %44, ptr %42, align 8
-  %45 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.iface", ptr %35, i64 3
-  %46 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 5)
-  %47 = call %"github.com/goplus/llgo/internal/runtime.iface" @"github.com/goplus/llgo/internal/runtime.MakeAnyIntptr"(ptr %46, i64 65)
-  store %"github.com/goplus/llgo/internal/runtime.iface" %47, ptr %45, align 8
-  %48 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.iface", ptr %35, i64 4
-  %49 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 5)
-  %50 = call %"github.com/goplus/llgo/internal/runtime.iface" @"github.com/goplus/llgo/internal/runtime.MakeAnyIntptr"(ptr %49, i64 20013)
-  store %"github.com/goplus/llgo/internal/runtime.iface" %50, ptr %48, align 8
-  %51 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.iface", ptr %35, i64 5
-  %52 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 3)
-  %53 = call %"github.com/goplus/llgo/internal/runtime.iface" @"github.com/goplus/llgo/internal/runtime.MakeAnyIntptr"(ptr %52, i64 1)
-  store %"github.com/goplus/llgo/internal/runtime.iface" %53, ptr %51, align 8
-  %54 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.iface", ptr %35, i64 6
-  %55 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 4)
-  %56 = call %"github.com/goplus/llgo/internal/runtime.iface" @"github.com/goplus/llgo/internal/runtime.MakeAnyIntptr"(ptr %55, i64 2)
-  store %"github.com/goplus/llgo/internal/runtime.iface" %56, ptr %54, align 8
-  %57 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.iface", ptr %35, i64 7
-  %58 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 5)
-  %59 = call %"github.com/goplus/llgo/internal/runtime.iface" @"github.com/goplus/llgo/internal/runtime.MakeAnyIntptr"(ptr %58, i64 3)
-  store %"github.com/goplus/llgo/internal/runtime.iface" %59, ptr %57, align 8
-  %60 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.iface", ptr %35, i64 8
-  %61 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 6)
-  %62 = call %"github.com/goplus/llgo/internal/runtime.iface" @"github.com/goplus/llgo/internal/runtime.MakeAnyIntptr"(ptr %61, i64 4)
-  store %"github.com/goplus/llgo/internal/runtime.iface" %62, ptr %60, align 8
-  %63 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.iface", ptr %35, i64 9
-  %64 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 2)
-  %65 = call %"github.com/goplus/llgo/internal/runtime.iface" @"github.com/goplus/llgo/internal/runtime.MakeAnyIntptr"(ptr %64, i64 5)
-  store %"github.com/goplus/llgo/internal/runtime.iface" %65, ptr %63, align 8
-  %66 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.iface", ptr %35, i64 10
-  %67 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 8)
-  %68 = call %"github.com/goplus/llgo/internal/runtime.iface" @"github.com/goplus/llgo/internal/runtime.MakeAnyIntptr"(ptr %67, i64 1)
-  store %"github.com/goplus/llgo/internal/runtime.iface" %68, ptr %66, align 8
-  %69 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.iface", ptr %35, i64 11
-  %70 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 9)
-  %71 = call %"github.com/goplus/llgo/internal/runtime.iface" @"github.com/goplus/llgo/internal/runtime.MakeAnyIntptr"(ptr %70, i64 2)
-  store %"github.com/goplus/llgo/internal/runtime.iface" %71, ptr %69, align 8
-  %72 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.iface", ptr %35, i64 12
-  %73 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 10)
-  %74 = call %"github.com/goplus/llgo/internal/runtime.iface" @"github.com/goplus/llgo/internal/runtime.MakeAnyIntptr"(ptr %73, i64 3)
-  store %"github.com/goplus/llgo/internal/runtime.iface" %74, ptr %72, align 8
-  %75 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.iface", ptr %35, i64 13
-  %76 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 11)
-  %77 = call %"github.com/goplus/llgo/internal/runtime.iface" @"github.com/goplus/llgo/internal/runtime.MakeAnyIntptr"(ptr %76, i64 4)
-  store %"github.com/goplus/llgo/internal/runtime.iface" %77, ptr %75, align 8
-  %78 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.iface", ptr %35, i64 14
-  %79 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 12)
-  %80 = call %"github.com/goplus/llgo/internal/runtime.iface" @"github.com/goplus/llgo/internal/runtime.MakeAnyIntptr"(ptr %79, i64 5)
-  store %"github.com/goplus/llgo/internal/runtime.iface" %80, ptr %78, align 8
-  %81 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.iface", ptr %35, i64 15
-  %82 = alloca %"github.com/goplus/llgo/internal/runtime.String", align 8
-  %83 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %82, i32 0, i32 0
-  store ptr @4, ptr %83, align 8
-  %84 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %82, i32 0, i32 1
-  store i64 4, ptr %84, align 4
-  %85 = load %"github.com/goplus/llgo/internal/runtime.String", ptr %82, align 8
-  %86 = call %"github.com/goplus/llgo/internal/runtime.iface" @"github.com/goplus/llgo/internal/runtime.MakeAnyString"(%"github.com/goplus/llgo/internal/runtime.String" %85)
-  store %"github.com/goplus/llgo/internal/runtime.iface" %86, ptr %81, align 8
-  %87 = call %"github.com/goplus/llgo/internal/runtime.Slice" @"github.com/goplus/llgo/internal/runtime.NewSlice3"(ptr %35, i64 16, i64 16, i64 0, i64 16, i64 16)
-  call void @main.println(%"github.com/goplus/llgo/internal/runtime.Slice" %87)
+  %35 = call ptr @"github.com/goplus/llgo/internal/runtime.AllocZ"(i64 48)
+  %36 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %35, i64 0
+  %37 = alloca %"github.com/goplus/llgo/internal/runtime.String", align 8
+  %38 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %37, i32 0, i32 0
+  store ptr @3, ptr %38, align 8
+  %39 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %37, i32 0, i32 1
+  store i64 8, ptr %39, align 4
+  %40 = load %"github.com/goplus/llgo/internal/runtime.String", ptr %37, align 8
+  %41 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 24)
+  %42 = call ptr @"github.com/goplus/llgo/internal/runtime.AllocU"(i64 16)
+  store %"github.com/goplus/llgo/internal/runtime.String" %40, ptr %42, align 8
+  %43 = alloca %"github.com/goplus/llgo/internal/runtime.eface", align 8
+  %44 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %43, i32 0, i32 0
+  store ptr %41, ptr %44, align 8
+  %45 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %43, i32 0, i32 1
+  store ptr %42, ptr %45, align 8
+  %46 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %43, align 8
+  store %"github.com/goplus/llgo/internal/runtime.eface" %46, ptr %36, align 8
+  %47 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %35, i64 1
+  %48 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 1)
+  %49 = alloca %"github.com/goplus/llgo/internal/runtime.eface", align 8
+  %50 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %49, i32 0, i32 0
+  store ptr %48, ptr %50, align 8
+  %51 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %49, i32 0, i32 1
+  store ptr inttoptr (i64 -1 to ptr), ptr %51, align 8
+  %52 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %49, align 8
+  store %"github.com/goplus/llgo/internal/runtime.eface" %52, ptr %47, align 8
+  %53 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %35, i64 2
+  %54 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 1)
+  %55 = alloca %"github.com/goplus/llgo/internal/runtime.eface", align 8
+  %56 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %55, i32 0, i32 0
+  store ptr %54, ptr %56, align 8
+  %57 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %55, i32 0, i32 1
+  store ptr inttoptr (i64 -1 to ptr), ptr %57, align 8
+  %58 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %55, align 8
+  store %"github.com/goplus/llgo/internal/runtime.eface" %58, ptr %53, align 8
+  %59 = call %"github.com/goplus/llgo/internal/runtime.Slice" @"github.com/goplus/llgo/internal/runtime.NewSlice3"(ptr %35, i64 16, i64 3, i64 0, i64 3, i64 3)
+  call void @main.println(%"github.com/goplus/llgo/internal/runtime.Slice" %59)
+  %60 = call ptr @"github.com/goplus/llgo/internal/runtime.AllocZ"(i64 256)
+  %61 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %60, i64 0
+  %62 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 1)
+  %63 = alloca %"github.com/goplus/llgo/internal/runtime.eface", align 8
+  %64 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %63, i32 0, i32 0
+  store ptr %62, ptr %64, align 8
+  %65 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %63, i32 0, i32 1
+  store ptr inttoptr (i64 -1 to ptr), ptr %65, align 8
+  %66 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %63, align 8
+  store %"github.com/goplus/llgo/internal/runtime.eface" %66, ptr %61, align 8
+  %67 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %60, i64 1
+  %68 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 1)
+  %69 = alloca %"github.com/goplus/llgo/internal/runtime.eface", align 8
+  %70 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %69, i32 0, i32 0
+  store ptr %68, ptr %70, align 8
+  %71 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %69, i32 0, i32 1
+  store ptr null, ptr %71, align 8
+  %72 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %69, align 8
+  store %"github.com/goplus/llgo/internal/runtime.eface" %72, ptr %67, align 8
+  %73 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %60, i64 2
+  %74 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 5)
+  %75 = alloca %"github.com/goplus/llgo/internal/runtime.eface", align 8
+  %76 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %75, i32 0, i32 0
+  store ptr %74, ptr %76, align 8
+  %77 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %75, i32 0, i32 1
+  store ptr inttoptr (i64 97 to ptr), ptr %77, align 8
+  %78 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %75, align 8
+  store %"github.com/goplus/llgo/internal/runtime.eface" %78, ptr %73, align 8
+  %79 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %60, i64 3
+  %80 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 5)
+  %81 = alloca %"github.com/goplus/llgo/internal/runtime.eface", align 8
+  %82 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %81, i32 0, i32 0
+  store ptr %80, ptr %82, align 8
+  %83 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %81, i32 0, i32 1
+  store ptr inttoptr (i64 65 to ptr), ptr %83, align 8
+  %84 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %81, align 8
+  store %"github.com/goplus/llgo/internal/runtime.eface" %84, ptr %79, align 8
+  %85 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %60, i64 4
+  %86 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 5)
+  %87 = alloca %"github.com/goplus/llgo/internal/runtime.eface", align 8
+  %88 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %87, i32 0, i32 0
+  store ptr %86, ptr %88, align 8
+  %89 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %87, i32 0, i32 1
+  store ptr inttoptr (i64 20013 to ptr), ptr %89, align 8
+  %90 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %87, align 8
+  store %"github.com/goplus/llgo/internal/runtime.eface" %90, ptr %85, align 8
+  %91 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %60, i64 5
+  %92 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 3)
+  %93 = alloca %"github.com/goplus/llgo/internal/runtime.eface", align 8
+  %94 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %93, i32 0, i32 0
+  store ptr %92, ptr %94, align 8
+  %95 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %93, i32 0, i32 1
+  store ptr inttoptr (i64 1 to ptr), ptr %95, align 8
+  %96 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %93, align 8
+  store %"github.com/goplus/llgo/internal/runtime.eface" %96, ptr %91, align 8
+  %97 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %60, i64 6
+  %98 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 4)
+  %99 = alloca %"github.com/goplus/llgo/internal/runtime.eface", align 8
+  %100 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %99, i32 0, i32 0
+  store ptr %98, ptr %100, align 8
+  %101 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %99, i32 0, i32 1
+  store ptr inttoptr (i64 2 to ptr), ptr %101, align 8
+  %102 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %99, align 8
+  store %"github.com/goplus/llgo/internal/runtime.eface" %102, ptr %97, align 8
+  %103 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %60, i64 7
+  %104 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 5)
+  %105 = alloca %"github.com/goplus/llgo/internal/runtime.eface", align 8
+  %106 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %105, i32 0, i32 0
+  store ptr %104, ptr %106, align 8
+  %107 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %105, i32 0, i32 1
+  store ptr inttoptr (i64 3 to ptr), ptr %107, align 8
+  %108 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %105, align 8
+  store %"github.com/goplus/llgo/internal/runtime.eface" %108, ptr %103, align 8
+  %109 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %60, i64 8
+  %110 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 6)
+  %111 = alloca %"github.com/goplus/llgo/internal/runtime.eface", align 8
+  %112 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %111, i32 0, i32 0
+  store ptr %110, ptr %112, align 8
+  %113 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %111, i32 0, i32 1
+  store ptr inttoptr (i64 4 to ptr), ptr %113, align 8
+  %114 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %111, align 8
+  store %"github.com/goplus/llgo/internal/runtime.eface" %114, ptr %109, align 8
+  %115 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %60, i64 9
+  %116 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 2)
+  %117 = alloca %"github.com/goplus/llgo/internal/runtime.eface", align 8
+  %118 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %117, i32 0, i32 0
+  store ptr %116, ptr %118, align 8
+  %119 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %117, i32 0, i32 1
+  store ptr inttoptr (i64 5 to ptr), ptr %119, align 8
+  %120 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %117, align 8
+  store %"github.com/goplus/llgo/internal/runtime.eface" %120, ptr %115, align 8
+  %121 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %60, i64 10
+  %122 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 8)
+  %123 = alloca %"github.com/goplus/llgo/internal/runtime.eface", align 8
+  %124 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %123, i32 0, i32 0
+  store ptr %122, ptr %124, align 8
+  %125 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %123, i32 0, i32 1
+  store ptr inttoptr (i64 1 to ptr), ptr %125, align 8
+  %126 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %123, align 8
+  store %"github.com/goplus/llgo/internal/runtime.eface" %126, ptr %121, align 8
+  %127 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %60, i64 11
+  %128 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 9)
+  %129 = alloca %"github.com/goplus/llgo/internal/runtime.eface", align 8
+  %130 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %129, i32 0, i32 0
+  store ptr %128, ptr %130, align 8
+  %131 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %129, i32 0, i32 1
+  store ptr inttoptr (i64 2 to ptr), ptr %131, align 8
+  %132 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %129, align 8
+  store %"github.com/goplus/llgo/internal/runtime.eface" %132, ptr %127, align 8
+  %133 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %60, i64 12
+  %134 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 10)
+  %135 = alloca %"github.com/goplus/llgo/internal/runtime.eface", align 8
+  %136 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %135, i32 0, i32 0
+  store ptr %134, ptr %136, align 8
+  %137 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %135, i32 0, i32 1
+  store ptr inttoptr (i64 3 to ptr), ptr %137, align 8
+  %138 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %135, align 8
+  store %"github.com/goplus/llgo/internal/runtime.eface" %138, ptr %133, align 8
+  %139 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %60, i64 13
+  %140 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 11)
+  %141 = alloca %"github.com/goplus/llgo/internal/runtime.eface", align 8
+  %142 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %141, i32 0, i32 0
+  store ptr %140, ptr %142, align 8
+  %143 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %141, i32 0, i32 1
+  store ptr inttoptr (i64 4 to ptr), ptr %143, align 8
+  %144 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %141, align 8
+  store %"github.com/goplus/llgo/internal/runtime.eface" %144, ptr %139, align 8
+  %145 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %60, i64 14
+  %146 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 12)
+  %147 = alloca %"github.com/goplus/llgo/internal/runtime.eface", align 8
+  %148 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %147, i32 0, i32 0
+  store ptr %146, ptr %148, align 8
+  %149 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %147, i32 0, i32 1
+  store ptr inttoptr (i64 5 to ptr), ptr %149, align 8
+  %150 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %147, align 8
+  store %"github.com/goplus/llgo/internal/runtime.eface" %150, ptr %145, align 8
+  %151 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %60, i64 15
+  %152 = alloca %"github.com/goplus/llgo/internal/runtime.String", align 8
+  %153 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %152, i32 0, i32 0
+  store ptr @4, ptr %153, align 8
+  %154 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %152, i32 0, i32 1
+  store i64 4, ptr %154, align 4
+  %155 = load %"github.com/goplus/llgo/internal/runtime.String", ptr %152, align 8
+  %156 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 24)
+  %157 = call ptr @"github.com/goplus/llgo/internal/runtime.AllocU"(i64 16)
+  store %"github.com/goplus/llgo/internal/runtime.String" %155, ptr %157, align 8
+  %158 = alloca %"github.com/goplus/llgo/internal/runtime.eface", align 8
+  %159 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %158, i32 0, i32 0
+  store ptr %156, ptr %159, align 8
+  %160 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %158, i32 0, i32 1
+  store ptr %157, ptr %160, align 8
+  %161 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %158, align 8
+  store %"github.com/goplus/llgo/internal/runtime.eface" %161, ptr %151, align 8
+  %162 = call %"github.com/goplus/llgo/internal/runtime.Slice" @"github.com/goplus/llgo/internal/runtime.NewSlice3"(ptr %60, i64 16, i64 16, i64 0, i64 16, i64 16)
+  call void @main.println(%"github.com/goplus/llgo/internal/runtime.Slice" %162)
   ret i32 0
 
 _llgo_3:                                          ; preds = %_llgo_0
@@ -245,190 +369,429 @@ _llgo_0:
   ret void
 }
 
-define void @main.printany(%"github.com/goplus/llgo/internal/runtime.iface" %0) {
+define void @main.printany(%"github.com/goplus/llgo/internal/runtime.eface" %0) {
 _llgo_0:
-  %1 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 1)
-  %2 = call { i64, i1 } @"github.com/goplus/llgo/internal/runtime.CheckI2Int"(%"github.com/goplus/llgo/internal/runtime.iface" %0, ptr %1)
-  %3 = extractvalue { i64, i1 } %2, 0
-  %4 = trunc i64 %3 to i1
-  %5 = extractvalue { i64, i1 } %2, 1
-  br i1 %5, label %_llgo_2, label %_llgo_3
+  %1 = extractvalue %"github.com/goplus/llgo/internal/runtime.eface" %0, 0
+  %2 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 1)
+  %3 = icmp eq ptr %1, %2
+  %4 = extractvalue %"github.com/goplus/llgo/internal/runtime.eface" %0, 1
+  %5 = ptrtoint ptr %4 to i64
+  %6 = trunc i64 %5 to i1
+  %7 = alloca { i1, i1 }, align 8
+  %8 = getelementptr inbounds { i1, i1 }, ptr %7, i32 0, i32 0
+  store i1 %6, ptr %8, align 1
+  %9 = getelementptr inbounds { i1, i1 }, ptr %7, i32 0, i32 1
+  store i1 true, ptr %9, align 1
+  %10 = load { i1, i1 }, ptr %7, align 1
+  %11 = alloca { i1, i1 }, align 8
+  %12 = getelementptr inbounds { i1, i1 }, ptr %11, i32 0, i32 0
+  store i1 false, ptr %12, align 1
+  %13 = getelementptr inbounds { i1, i1 }, ptr %11, i32 0, i32 1
+  store i1 false, ptr %13, align 1
+  %14 = load { i1, i1 }, ptr %11, align 1
+  %15 = select i1 %3, { i1, i1 } %10, { i1, i1 } %14
+  %16 = extractvalue { i1, i1 } %15, 0
+  %17 = extractvalue { i1, i1 } %15, 1
+  br i1 %17, label %_llgo_2, label %_llgo_3
 
 _llgo_1:                                          ; preds = %_llgo_30, %_llgo_29, %_llgo_28, %_llgo_26, %_llgo_24, %_llgo_22, %_llgo_20, %_llgo_18, %_llgo_16, %_llgo_14, %_llgo_12, %_llgo_10, %_llgo_8, %_llgo_6, %_llgo_4, %_llgo_2
   ret void
 
 _llgo_2:                                          ; preds = %_llgo_0
-  call void @main.printbool(i1 %4)
+  call void @main.printbool(i1 %16)
   br label %_llgo_1
 
 _llgo_3:                                          ; preds = %_llgo_0
-  %6 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 2)
-  %7 = call { i64, i1 } @"github.com/goplus/llgo/internal/runtime.CheckI2Int"(%"github.com/goplus/llgo/internal/runtime.iface" %0, ptr %6)
-  %8 = extractvalue { i64, i1 } %7, 0
-  %9 = extractvalue { i64, i1 } %7, 1
-  br i1 %9, label %_llgo_4, label %_llgo_5
+  %18 = extractvalue %"github.com/goplus/llgo/internal/runtime.eface" %0, 0
+  %19 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 2)
+  %20 = icmp eq ptr %18, %19
+  %21 = extractvalue %"github.com/goplus/llgo/internal/runtime.eface" %0, 1
+  %22 = ptrtoint ptr %21 to i64
+  %23 = alloca { i64, i1 }, align 8
+  %24 = getelementptr inbounds { i64, i1 }, ptr %23, i32 0, i32 0
+  store i64 %22, ptr %24, align 4
+  %25 = getelementptr inbounds { i64, i1 }, ptr %23, i32 0, i32 1
+  store i1 true, ptr %25, align 1
+  %26 = load { i64, i1 }, ptr %23, align 4
+  %27 = alloca { i64, i1 }, align 8
+  %28 = getelementptr inbounds { i64, i1 }, ptr %27, i32 0, i32 0
+  store i64 0, ptr %28, align 4
+  %29 = getelementptr inbounds { i64, i1 }, ptr %27, i32 0, i32 1
+  store i1 false, ptr %29, align 1
+  %30 = load { i64, i1 }, ptr %27, align 4
+  %31 = select i1 %20, { i64, i1 } %26, { i64, i1 } %30
+  %32 = extractvalue { i64, i1 } %31, 0
+  %33 = extractvalue { i64, i1 } %31, 1
+  br i1 %33, label %_llgo_4, label %_llgo_5
 
 _llgo_4:                                          ; preds = %_llgo_3
-  call void @main.printint(i64 %8)
+  call void @main.printint(i64 %32)
   br label %_llgo_1
 
 _llgo_5:                                          ; preds = %_llgo_3
-  %10 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 3)
-  %11 = call { i64, i1 } @"github.com/goplus/llgo/internal/runtime.CheckI2Int"(%"github.com/goplus/llgo/internal/runtime.iface" %0, ptr %10)
-  %12 = extractvalue { i64, i1 } %11, 0
-  %13 = trunc i64 %12 to i8
-  %14 = extractvalue { i64, i1 } %11, 1
-  br i1 %14, label %_llgo_6, label %_llgo_7
+  %34 = extractvalue %"github.com/goplus/llgo/internal/runtime.eface" %0, 0
+  %35 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 3)
+  %36 = icmp eq ptr %34, %35
+  %37 = extractvalue %"github.com/goplus/llgo/internal/runtime.eface" %0, 1
+  %38 = ptrtoint ptr %37 to i64
+  %39 = trunc i64 %38 to i8
+  %40 = alloca { i8, i1 }, align 8
+  %41 = getelementptr inbounds { i8, i1 }, ptr %40, i32 0, i32 0
+  store i8 %39, ptr %41, align 1
+  %42 = getelementptr inbounds { i8, i1 }, ptr %40, i32 0, i32 1
+  store i1 true, ptr %42, align 1
+  %43 = load { i8, i1 }, ptr %40, align 1
+  %44 = alloca { i8, i1 }, align 8
+  %45 = getelementptr inbounds { i8, i1 }, ptr %44, i32 0, i32 0
+  store i8 0, ptr %45, align 1
+  %46 = getelementptr inbounds { i8, i1 }, ptr %44, i32 0, i32 1
+  store i1 false, ptr %46, align 1
+  %47 = load { i8, i1 }, ptr %44, align 1
+  %48 = select i1 %36, { i8, i1 } %43, { i8, i1 } %47
+  %49 = extractvalue { i8, i1 } %48, 0
+  %50 = extractvalue { i8, i1 } %48, 1
+  br i1 %50, label %_llgo_6, label %_llgo_7
 
 _llgo_6:                                          ; preds = %_llgo_5
-  %15 = sext i8 %13 to i64
-  call void @main.printint(i64 %15)
+  %51 = sext i8 %49 to i64
+  call void @main.printint(i64 %51)
   br label %_llgo_1
 
 _llgo_7:                                          ; preds = %_llgo_5
-  %16 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 4)
-  %17 = call { i64, i1 } @"github.com/goplus/llgo/internal/runtime.CheckI2Int"(%"github.com/goplus/llgo/internal/runtime.iface" %0, ptr %16)
-  %18 = extractvalue { i64, i1 } %17, 0
-  %19 = trunc i64 %18 to i16
-  %20 = extractvalue { i64, i1 } %17, 1
-  br i1 %20, label %_llgo_8, label %_llgo_9
+  %52 = extractvalue %"github.com/goplus/llgo/internal/runtime.eface" %0, 0
+  %53 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 4)
+  %54 = icmp eq ptr %52, %53
+  %55 = extractvalue %"github.com/goplus/llgo/internal/runtime.eface" %0, 1
+  %56 = ptrtoint ptr %55 to i64
+  %57 = trunc i64 %56 to i16
+  %58 = alloca { i16, i1 }, align 8
+  %59 = getelementptr inbounds { i16, i1 }, ptr %58, i32 0, i32 0
+  store i16 %57, ptr %59, align 2
+  %60 = getelementptr inbounds { i16, i1 }, ptr %58, i32 0, i32 1
+  store i1 true, ptr %60, align 1
+  %61 = load { i16, i1 }, ptr %58, align 2
+  %62 = alloca { i16, i1 }, align 8
+  %63 = getelementptr inbounds { i16, i1 }, ptr %62, i32 0, i32 0
+  store i16 0, ptr %63, align 2
+  %64 = getelementptr inbounds { i16, i1 }, ptr %62, i32 0, i32 1
+  store i1 false, ptr %64, align 1
+  %65 = load { i16, i1 }, ptr %62, align 2
+  %66 = select i1 %54, { i16, i1 } %61, { i16, i1 } %65
+  %67 = extractvalue { i16, i1 } %66, 0
+  %68 = extractvalue { i16, i1 } %66, 1
+  br i1 %68, label %_llgo_8, label %_llgo_9
 
 _llgo_8:                                          ; preds = %_llgo_7
-  %21 = sext i16 %19 to i64
-  call void @main.printint(i64 %21)
+  %69 = sext i16 %67 to i64
+  call void @main.printint(i64 %69)
   br label %_llgo_1
 
 _llgo_9:                                          ; preds = %_llgo_7
-  %22 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 5)
-  %23 = call { i64, i1 } @"github.com/goplus/llgo/internal/runtime.CheckI2Int"(%"github.com/goplus/llgo/internal/runtime.iface" %0, ptr %22)
-  %24 = extractvalue { i64, i1 } %23, 0
-  %25 = trunc i64 %24 to i32
-  %26 = extractvalue { i64, i1 } %23, 1
-  br i1 %26, label %_llgo_10, label %_llgo_11
+  %70 = extractvalue %"github.com/goplus/llgo/internal/runtime.eface" %0, 0
+  %71 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 5)
+  %72 = icmp eq ptr %70, %71
+  %73 = extractvalue %"github.com/goplus/llgo/internal/runtime.eface" %0, 1
+  %74 = ptrtoint ptr %73 to i64
+  %75 = trunc i64 %74 to i32
+  %76 = alloca { i32, i1 }, align 8
+  %77 = getelementptr inbounds { i32, i1 }, ptr %76, i32 0, i32 0
+  store i32 %75, ptr %77, align 4
+  %78 = getelementptr inbounds { i32, i1 }, ptr %76, i32 0, i32 1
+  store i1 true, ptr %78, align 1
+  %79 = load { i32, i1 }, ptr %76, align 4
+  %80 = alloca { i32, i1 }, align 8
+  %81 = getelementptr inbounds { i32, i1 }, ptr %80, i32 0, i32 0
+  store i32 0, ptr %81, align 4
+  %82 = getelementptr inbounds { i32, i1 }, ptr %80, i32 0, i32 1
+  store i1 false, ptr %82, align 1
+  %83 = load { i32, i1 }, ptr %80, align 4
+  %84 = select i1 %72, { i32, i1 } %79, { i32, i1 } %83
+  %85 = extractvalue { i32, i1 } %84, 0
+  %86 = extractvalue { i32, i1 } %84, 1
+  br i1 %86, label %_llgo_10, label %_llgo_11
 
 _llgo_10:                                         ; preds = %_llgo_9
-  %27 = sext i32 %25 to i64
-  call void @main.printint(i64 %27)
+  %87 = sext i32 %85 to i64
+  call void @main.printint(i64 %87)
   br label %_llgo_1
 
 _llgo_11:                                         ; preds = %_llgo_9
-  %28 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 6)
-  %29 = call { i64, i1 } @"github.com/goplus/llgo/internal/runtime.CheckI2Int"(%"github.com/goplus/llgo/internal/runtime.iface" %0, ptr %28)
-  %30 = extractvalue { i64, i1 } %29, 0
-  %31 = extractvalue { i64, i1 } %29, 1
-  br i1 %31, label %_llgo_12, label %_llgo_13
+  %88 = extractvalue %"github.com/goplus/llgo/internal/runtime.eface" %0, 0
+  %89 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 6)
+  %90 = icmp eq ptr %88, %89
+  %91 = extractvalue %"github.com/goplus/llgo/internal/runtime.eface" %0, 1
+  %92 = ptrtoint ptr %91 to i64
+  %93 = alloca { i64, i1 }, align 8
+  %94 = getelementptr inbounds { i64, i1 }, ptr %93, i32 0, i32 0
+  store i64 %92, ptr %94, align 4
+  %95 = getelementptr inbounds { i64, i1 }, ptr %93, i32 0, i32 1
+  store i1 true, ptr %95, align 1
+  %96 = load { i64, i1 }, ptr %93, align 4
+  %97 = alloca { i64, i1 }, align 8
+  %98 = getelementptr inbounds { i64, i1 }, ptr %97, i32 0, i32 0
+  store i64 0, ptr %98, align 4
+  %99 = getelementptr inbounds { i64, i1 }, ptr %97, i32 0, i32 1
+  store i1 false, ptr %99, align 1
+  %100 = load { i64, i1 }, ptr %97, align 4
+  %101 = select i1 %90, { i64, i1 } %96, { i64, i1 } %100
+  %102 = extractvalue { i64, i1 } %101, 0
+  %103 = extractvalue { i64, i1 } %101, 1
+  br i1 %103, label %_llgo_12, label %_llgo_13
 
 _llgo_12:                                         ; preds = %_llgo_11
-  call void @main.printint(i64 %30)
+  call void @main.printint(i64 %102)
   br label %_llgo_1
 
 _llgo_13:                                         ; preds = %_llgo_11
-  %32 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 7)
-  %33 = call { i64, i1 } @"github.com/goplus/llgo/internal/runtime.CheckI2Int"(%"github.com/goplus/llgo/internal/runtime.iface" %0, ptr %32)
-  %34 = extractvalue { i64, i1 } %33, 0
-  %35 = extractvalue { i64, i1 } %33, 1
-  br i1 %35, label %_llgo_14, label %_llgo_15
+  %104 = extractvalue %"github.com/goplus/llgo/internal/runtime.eface" %0, 0
+  %105 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 7)
+  %106 = icmp eq ptr %104, %105
+  %107 = extractvalue %"github.com/goplus/llgo/internal/runtime.eface" %0, 1
+  %108 = ptrtoint ptr %107 to i64
+  %109 = alloca { i64, i1 }, align 8
+  %110 = getelementptr inbounds { i64, i1 }, ptr %109, i32 0, i32 0
+  store i64 %108, ptr %110, align 4
+  %111 = getelementptr inbounds { i64, i1 }, ptr %109, i32 0, i32 1
+  store i1 true, ptr %111, align 1
+  %112 = load { i64, i1 }, ptr %109, align 4
+  %113 = alloca { i64, i1 }, align 8
+  %114 = getelementptr inbounds { i64, i1 }, ptr %113, i32 0, i32 0
+  store i64 0, ptr %114, align 4
+  %115 = getelementptr inbounds { i64, i1 }, ptr %113, i32 0, i32 1
+  store i1 false, ptr %115, align 1
+  %116 = load { i64, i1 }, ptr %113, align 4
+  %117 = select i1 %106, { i64, i1 } %112, { i64, i1 } %116
+  %118 = extractvalue { i64, i1 } %117, 0
+  %119 = extractvalue { i64, i1 } %117, 1
+  br i1 %119, label %_llgo_14, label %_llgo_15
 
 _llgo_14:                                         ; preds = %_llgo_13
-  call void @main.printuint(i64 %34)
+  call void @main.printuint(i64 %118)
   br label %_llgo_1
 
 _llgo_15:                                         ; preds = %_llgo_13
-  %36 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 8)
-  %37 = call { i64, i1 } @"github.com/goplus/llgo/internal/runtime.CheckI2Int"(%"github.com/goplus/llgo/internal/runtime.iface" %0, ptr %36)
-  %38 = extractvalue { i64, i1 } %37, 0
-  %39 = trunc i64 %38 to i8
-  %40 = extractvalue { i64, i1 } %37, 1
-  br i1 %40, label %_llgo_16, label %_llgo_17
+  %120 = extractvalue %"github.com/goplus/llgo/internal/runtime.eface" %0, 0
+  %121 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 8)
+  %122 = icmp eq ptr %120, %121
+  %123 = extractvalue %"github.com/goplus/llgo/internal/runtime.eface" %0, 1
+  %124 = ptrtoint ptr %123 to i64
+  %125 = trunc i64 %124 to i8
+  %126 = alloca { i8, i1 }, align 8
+  %127 = getelementptr inbounds { i8, i1 }, ptr %126, i32 0, i32 0
+  store i8 %125, ptr %127, align 1
+  %128 = getelementptr inbounds { i8, i1 }, ptr %126, i32 0, i32 1
+  store i1 true, ptr %128, align 1
+  %129 = load { i8, i1 }, ptr %126, align 1
+  %130 = alloca { i8, i1 }, align 8
+  %131 = getelementptr inbounds { i8, i1 }, ptr %130, i32 0, i32 0
+  store i8 0, ptr %131, align 1
+  %132 = getelementptr inbounds { i8, i1 }, ptr %130, i32 0, i32 1
+  store i1 false, ptr %132, align 1
+  %133 = load { i8, i1 }, ptr %130, align 1
+  %134 = select i1 %122, { i8, i1 } %129, { i8, i1 } %133
+  %135 = extractvalue { i8, i1 } %134, 0
+  %136 = extractvalue { i8, i1 } %134, 1
+  br i1 %136, label %_llgo_16, label %_llgo_17
 
 _llgo_16:                                         ; preds = %_llgo_15
-  %41 = zext i8 %39 to i64
-  call void @main.printuint(i64 %41)
+  %137 = zext i8 %135 to i64
+  call void @main.printuint(i64 %137)
   br label %_llgo_1
 
 _llgo_17:                                         ; preds = %_llgo_15
-  %42 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 9)
-  %43 = call { i64, i1 } @"github.com/goplus/llgo/internal/runtime.CheckI2Int"(%"github.com/goplus/llgo/internal/runtime.iface" %0, ptr %42)
-  %44 = extractvalue { i64, i1 } %43, 0
-  %45 = trunc i64 %44 to i16
-  %46 = extractvalue { i64, i1 } %43, 1
-  br i1 %46, label %_llgo_18, label %_llgo_19
+  %138 = extractvalue %"github.com/goplus/llgo/internal/runtime.eface" %0, 0
+  %139 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 9)
+  %140 = icmp eq ptr %138, %139
+  %141 = extractvalue %"github.com/goplus/llgo/internal/runtime.eface" %0, 1
+  %142 = ptrtoint ptr %141 to i64
+  %143 = trunc i64 %142 to i16
+  %144 = alloca { i16, i1 }, align 8
+  %145 = getelementptr inbounds { i16, i1 }, ptr %144, i32 0, i32 0
+  store i16 %143, ptr %145, align 2
+  %146 = getelementptr inbounds { i16, i1 }, ptr %144, i32 0, i32 1
+  store i1 true, ptr %146, align 1
+  %147 = load { i16, i1 }, ptr %144, align 2
+  %148 = alloca { i16, i1 }, align 8
+  %149 = getelementptr inbounds { i16, i1 }, ptr %148, i32 0, i32 0
+  store i16 0, ptr %149, align 2
+  %150 = getelementptr inbounds { i16, i1 }, ptr %148, i32 0, i32 1
+  store i1 false, ptr %150, align 1
+  %151 = load { i16, i1 }, ptr %148, align 2
+  %152 = select i1 %140, { i16, i1 } %147, { i16, i1 } %151
+  %153 = extractvalue { i16, i1 } %152, 0
+  %154 = extractvalue { i16, i1 } %152, 1
+  br i1 %154, label %_llgo_18, label %_llgo_19
 
 _llgo_18:                                         ; preds = %_llgo_17
-  %47 = zext i16 %45 to i64
-  call void @main.printuint(i64 %47)
+  %155 = zext i16 %153 to i64
+  call void @main.printuint(i64 %155)
   br label %_llgo_1
 
 _llgo_19:                                         ; preds = %_llgo_17
-  %48 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 10)
-  %49 = call { i64, i1 } @"github.com/goplus/llgo/internal/runtime.CheckI2Int"(%"github.com/goplus/llgo/internal/runtime.iface" %0, ptr %48)
-  %50 = extractvalue { i64, i1 } %49, 0
-  %51 = trunc i64 %50 to i32
-  %52 = extractvalue { i64, i1 } %49, 1
-  br i1 %52, label %_llgo_20, label %_llgo_21
+  %156 = extractvalue %"github.com/goplus/llgo/internal/runtime.eface" %0, 0
+  %157 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 10)
+  %158 = icmp eq ptr %156, %157
+  %159 = extractvalue %"github.com/goplus/llgo/internal/runtime.eface" %0, 1
+  %160 = ptrtoint ptr %159 to i64
+  %161 = trunc i64 %160 to i32
+  %162 = alloca { i32, i1 }, align 8
+  %163 = getelementptr inbounds { i32, i1 }, ptr %162, i32 0, i32 0
+  store i32 %161, ptr %163, align 4
+  %164 = getelementptr inbounds { i32, i1 }, ptr %162, i32 0, i32 1
+  store i1 true, ptr %164, align 1
+  %165 = load { i32, i1 }, ptr %162, align 4
+  %166 = alloca { i32, i1 }, align 8
+  %167 = getelementptr inbounds { i32, i1 }, ptr %166, i32 0, i32 0
+  store i32 0, ptr %167, align 4
+  %168 = getelementptr inbounds { i32, i1 }, ptr %166, i32 0, i32 1
+  store i1 false, ptr %168, align 1
+  %169 = load { i32, i1 }, ptr %166, align 4
+  %170 = select i1 %158, { i32, i1 } %165, { i32, i1 } %169
+  %171 = extractvalue { i32, i1 } %170, 0
+  %172 = extractvalue { i32, i1 } %170, 1
+  br i1 %172, label %_llgo_20, label %_llgo_21
 
 _llgo_20:                                         ; preds = %_llgo_19
-  %53 = zext i32 %51 to i64
-  call void @main.printuint(i64 %53)
+  %173 = zext i32 %171 to i64
+  call void @main.printuint(i64 %173)
   br label %_llgo_1
 
 _llgo_21:                                         ; preds = %_llgo_19
-  %54 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 11)
-  %55 = call { i64, i1 } @"github.com/goplus/llgo/internal/runtime.CheckI2Int"(%"github.com/goplus/llgo/internal/runtime.iface" %0, ptr %54)
-  %56 = extractvalue { i64, i1 } %55, 0
-  %57 = extractvalue { i64, i1 } %55, 1
-  br i1 %57, label %_llgo_22, label %_llgo_23
+  %174 = extractvalue %"github.com/goplus/llgo/internal/runtime.eface" %0, 0
+  %175 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 11)
+  %176 = icmp eq ptr %174, %175
+  %177 = extractvalue %"github.com/goplus/llgo/internal/runtime.eface" %0, 1
+  %178 = ptrtoint ptr %177 to i64
+  %179 = alloca { i64, i1 }, align 8
+  %180 = getelementptr inbounds { i64, i1 }, ptr %179, i32 0, i32 0
+  store i64 %178, ptr %180, align 4
+  %181 = getelementptr inbounds { i64, i1 }, ptr %179, i32 0, i32 1
+  store i1 true, ptr %181, align 1
+  %182 = load { i64, i1 }, ptr %179, align 4
+  %183 = alloca { i64, i1 }, align 8
+  %184 = getelementptr inbounds { i64, i1 }, ptr %183, i32 0, i32 0
+  store i64 0, ptr %184, align 4
+  %185 = getelementptr inbounds { i64, i1 }, ptr %183, i32 0, i32 1
+  store i1 false, ptr %185, align 1
+  %186 = load { i64, i1 }, ptr %183, align 4
+  %187 = select i1 %176, { i64, i1 } %182, { i64, i1 } %186
+  %188 = extractvalue { i64, i1 } %187, 0
+  %189 = extractvalue { i64, i1 } %187, 1
+  br i1 %189, label %_llgo_22, label %_llgo_23
 
 _llgo_22:                                         ; preds = %_llgo_21
-  call void @main.printuint(i64 %56)
+  call void @main.printuint(i64 %188)
   br label %_llgo_1
 
 _llgo_23:                                         ; preds = %_llgo_21
-  %58 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 12)
-  %59 = call { i64, i1 } @"github.com/goplus/llgo/internal/runtime.CheckI2Int"(%"github.com/goplus/llgo/internal/runtime.iface" %0, ptr %58)
-  %60 = extractvalue { i64, i1 } %59, 0
-  %61 = extractvalue { i64, i1 } %59, 1
-  br i1 %61, label %_llgo_24, label %_llgo_25
+  %190 = extractvalue %"github.com/goplus/llgo/internal/runtime.eface" %0, 0
+  %191 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 12)
+  %192 = icmp eq ptr %190, %191
+  %193 = extractvalue %"github.com/goplus/llgo/internal/runtime.eface" %0, 1
+  %194 = ptrtoint ptr %193 to i64
+  %195 = alloca { i64, i1 }, align 8
+  %196 = getelementptr inbounds { i64, i1 }, ptr %195, i32 0, i32 0
+  store i64 %194, ptr %196, align 4
+  %197 = getelementptr inbounds { i64, i1 }, ptr %195, i32 0, i32 1
+  store i1 true, ptr %197, align 1
+  %198 = load { i64, i1 }, ptr %195, align 4
+  %199 = alloca { i64, i1 }, align 8
+  %200 = getelementptr inbounds { i64, i1 }, ptr %199, i32 0, i32 0
+  store i64 0, ptr %200, align 4
+  %201 = getelementptr inbounds { i64, i1 }, ptr %199, i32 0, i32 1
+  store i1 false, ptr %201, align 1
+  %202 = load { i64, i1 }, ptr %199, align 4
+  %203 = select i1 %192, { i64, i1 } %198, { i64, i1 } %202
+  %204 = extractvalue { i64, i1 } %203, 0
+  %205 = extractvalue { i64, i1 } %203, 1
+  br i1 %205, label %_llgo_24, label %_llgo_25
 
 _llgo_24:                                         ; preds = %_llgo_23
-  call void @main.printuint(i64 %60)
+  call void @main.printuint(i64 %204)
   br label %_llgo_1
 
 _llgo_25:                                         ; preds = %_llgo_23
-  %62 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 13)
-  %63 = call { i64, i1 } @"github.com/goplus/llgo/internal/runtime.CheckI2Int"(%"github.com/goplus/llgo/internal/runtime.iface" %0, ptr %62)
-  %64 = extractvalue { i64, i1 } %63, 0
-  %65 = trunc i64 %64 to i32
-  %66 = bitcast i32 %65 to float
-  %67 = extractvalue { i64, i1 } %63, 1
-  br i1 %67, label %_llgo_26, label %_llgo_27
+  %206 = extractvalue %"github.com/goplus/llgo/internal/runtime.eface" %0, 0
+  %207 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 13)
+  %208 = icmp eq ptr %206, %207
+  %209 = extractvalue %"github.com/goplus/llgo/internal/runtime.eface" %0, 1
+  %210 = ptrtoint ptr %209 to i64
+  %211 = bitcast i64 %210 to float
+  %212 = alloca { float, i1 }, align 8
+  %213 = getelementptr inbounds { float, i1 }, ptr %212, i32 0, i32 0
+  store float %211, ptr %213, align 4
+  %214 = getelementptr inbounds { float, i1 }, ptr %212, i32 0, i32 1
+  store i1 true, ptr %214, align 1
+  %215 = load { float, i1 }, ptr %212, align 4
+  %216 = alloca { float, i1 }, align 8
+  %217 = getelementptr inbounds { float, i1 }, ptr %216, i32 0, i32 0
+  store double 0.000000e+00, ptr %217, align 8
+  %218 = getelementptr inbounds { float, i1 }, ptr %216, i32 0, i32 1
+  store i1 false, ptr %218, align 1
+  %219 = load { float, i1 }, ptr %216, align 4
+  %220 = select i1 %208, { float, i1 } %215, { float, i1 } %219
+  %221 = extractvalue { float, i1 } %220, 0
+  %222 = extractvalue { float, i1 } %220, 1
+  br i1 %222, label %_llgo_26, label %_llgo_27
 
 _llgo_26:                                         ; preds = %_llgo_25
-  %68 = fpext float %66 to double
-  call void @main.printfloat(double %68)
+  %223 = fpext float %221 to double
+  call void @main.printfloat(double %223)
   br label %_llgo_1
 
 _llgo_27:                                         ; preds = %_llgo_25
-  %69 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 14)
-  %70 = call { i64, i1 } @"github.com/goplus/llgo/internal/runtime.CheckI2Int"(%"github.com/goplus/llgo/internal/runtime.iface" %0, ptr %69)
-  %71 = extractvalue { i64, i1 } %70, 0
-  %72 = bitcast i64 %71 to double
-  %73 = extractvalue { i64, i1 } %70, 1
-  br i1 %73, label %_llgo_28, label %_llgo_29
+  %224 = extractvalue %"github.com/goplus/llgo/internal/runtime.eface" %0, 0
+  %225 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 14)
+  %226 = icmp eq ptr %224, %225
+  %227 = extractvalue %"github.com/goplus/llgo/internal/runtime.eface" %0, 1
+  %228 = ptrtoint ptr %227 to i64
+  %229 = bitcast i64 %228 to double
+  %230 = alloca { double, i1 }, align 8
+  %231 = getelementptr inbounds { double, i1 }, ptr %230, i32 0, i32 0
+  store double %229, ptr %231, align 8
+  %232 = getelementptr inbounds { double, i1 }, ptr %230, i32 0, i32 1
+  store i1 true, ptr %232, align 1
+  %233 = load { double, i1 }, ptr %230, align 8
+  %234 = alloca { double, i1 }, align 8
+  %235 = getelementptr inbounds { double, i1 }, ptr %234, i32 0, i32 0
+  store double 0.000000e+00, ptr %235, align 8
+  %236 = getelementptr inbounds { double, i1 }, ptr %234, i32 0, i32 1
+  store i1 false, ptr %236, align 1
+  %237 = load { double, i1 }, ptr %234, align 8
+  %238 = select i1 %226, { double, i1 } %233, { double, i1 } %237
+  %239 = extractvalue { double, i1 } %238, 0
+  %240 = extractvalue { double, i1 } %238, 1
+  br i1 %240, label %_llgo_28, label %_llgo_29
 
 _llgo_28:                                         ; preds = %_llgo_27
-  call void @main.printfloat(double %72)
+  call void @main.printfloat(double %239)
   br label %_llgo_1
 
 _llgo_29:                                         ; preds = %_llgo_27
-  %74 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 24)
-  %75 = call { %"github.com/goplus/llgo/internal/runtime.String", i1 } @"github.com/goplus/llgo/internal/runtime.CheckI2String"(%"github.com/goplus/llgo/internal/runtime.iface" %0, ptr %74)
-  %76 = extractvalue { %"github.com/goplus/llgo/internal/runtime.String", i1 } %75, 0
-  %77 = extractvalue { %"github.com/goplus/llgo/internal/runtime.String", i1 } %75, 1
-  br i1 %77, label %_llgo_30, label %_llgo_1
+  %241 = extractvalue %"github.com/goplus/llgo/internal/runtime.eface" %0, 0
+  %242 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 24)
+  %243 = icmp eq ptr %241, %242
+  %244 = extractvalue %"github.com/goplus/llgo/internal/runtime.eface" %0, 1
+  %245 = load %"github.com/goplus/llgo/internal/runtime.String", ptr %244, align 8
+  %246 = alloca { %"github.com/goplus/llgo/internal/runtime.String", i1 }, align 8
+  %247 = getelementptr inbounds { %"github.com/goplus/llgo/internal/runtime.String", i1 }, ptr %246, i32 0, i32 0
+  store %"github.com/goplus/llgo/internal/runtime.String" %245, ptr %247, align 8
+  %248 = getelementptr inbounds { %"github.com/goplus/llgo/internal/runtime.String", i1 }, ptr %246, i32 0, i32 1
+  store i1 true, ptr %248, align 1
+  %249 = load { %"github.com/goplus/llgo/internal/runtime.String", i1 }, ptr %246, align 8
+  %250 = alloca { %"github.com/goplus/llgo/internal/runtime.String", i1 }, align 8
+  %251 = getelementptr inbounds { %"github.com/goplus/llgo/internal/runtime.String", i1 }, ptr %250, i32 0, i32 0
+  store { ptr, i64 } zeroinitializer, ptr %251, align 8
+  %252 = getelementptr inbounds { %"github.com/goplus/llgo/internal/runtime.String", i1 }, ptr %250, i32 0, i32 1
+  store i1 false, ptr %252, align 1
+  %253 = load { %"github.com/goplus/llgo/internal/runtime.String", i1 }, ptr %250, align 8
+  %254 = select i1 %243, { %"github.com/goplus/llgo/internal/runtime.String", i1 } %249, { %"github.com/goplus/llgo/internal/runtime.String", i1 } %253
+  %255 = extractvalue { %"github.com/goplus/llgo/internal/runtime.String", i1 } %254, 0
+  %256 = extractvalue { %"github.com/goplus/llgo/internal/runtime.String", i1 } %254, 1
+  br i1 %256, label %_llgo_30, label %_llgo_1
 
 _llgo_30:                                         ; preds = %_llgo_29
-  call void @main.printstring(%"github.com/goplus/llgo/internal/runtime.String" %76)
+  call void @main.printstring(%"github.com/goplus/llgo/internal/runtime.String" %255)
   br label %_llgo_1
 }
 
@@ -756,8 +1119,8 @@ _llgo_2:                                          ; preds = %_llgo_1
   %5 = icmp slt i64 %3, 0
   call void @"github.com/goplus/llgo/internal/runtime.AssertIndexRange"(i1 %5)
   %6 = extractvalue %"github.com/goplus/llgo/internal/runtime.Slice" %0, 0
-  %7 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.iface", ptr %6, i64 %3
-  %8 = load %"github.com/goplus/llgo/internal/runtime.iface", ptr %7, align 8
+  %7 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %6, i64 %3
+  %8 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %7, align 8
   %9 = icmp ne i64 %3, 0
   br i1 %9, label %_llgo_4, label %_llgo_5
 
@@ -776,7 +1139,7 @@ _llgo_4:                                          ; preds = %_llgo_2
   br label %_llgo_5
 
 _llgo_5:                                          ; preds = %_llgo_4, %_llgo_2
-  call void @main.printany(%"github.com/goplus/llgo/internal/runtime.iface" %8)
+  call void @main.printany(%"github.com/goplus/llgo/internal/runtime.eface" %8)
   br label %_llgo_1
 }
 
@@ -869,16 +1232,10 @@ declare i32 @printf(ptr, ...)
 
 declare void @"github.com/goplus/llgo/internal/runtime.init"()
 
-declare %"github.com/goplus/llgo/internal/runtime.iface" @"github.com/goplus/llgo/internal/runtime.MakeAnyIntptr"(ptr, i64)
-
 declare ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64)
 
-declare %"github.com/goplus/llgo/internal/runtime.iface" @"github.com/goplus/llgo/internal/runtime.MakeAnyString"(%"github.com/goplus/llgo/internal/runtime.String")
+declare ptr @"github.com/goplus/llgo/internal/runtime.AllocU"(i64)
 
 declare %"github.com/goplus/llgo/internal/runtime.Slice" @"github.com/goplus/llgo/internal/runtime.NewSlice3"(ptr, i64, i64, i64, i64, i64)
 
-declare { i64, i1 } @"github.com/goplus/llgo/internal/runtime.CheckI2Int"(%"github.com/goplus/llgo/internal/runtime.iface", ptr)
-
-declare { %"github.com/goplus/llgo/internal/runtime.String", i1 } @"github.com/goplus/llgo/internal/runtime.CheckI2String"(%"github.com/goplus/llgo/internal/runtime.iface", ptr)
-
 declare void @"github.com/goplus/llgo/internal/runtime.AssertIndexRange"(i1)
diff --git a/cl/_testdata/vargs/out.ll b/cl/_testdata/vargs/out.ll
index 86c098c9..dbb7eda8 100644
--- a/cl/_testdata/vargs/out.ll
+++ b/cl/_testdata/vargs/out.ll
@@ -1,13 +1,15 @@
 ; ModuleID = 'main'
 source_filename = "main"
 
-%"github.com/goplus/llgo/internal/runtime.iface" = type { ptr, ptr }
+%"github.com/goplus/llgo/internal/runtime.eface" = type { ptr, ptr }
 %"github.com/goplus/llgo/internal/runtime.Slice" = type { ptr, i64, i64 }
+%"github.com/goplus/llgo/internal/runtime.String" = type { ptr, i64 }
 
 @"main.init$guard" = global ptr null
 @__llgo_argc = global ptr null
 @__llgo_argv = global ptr null
 @0 = private unnamed_addr constant [4 x i8] c"%d\0A\00", align 1
+@1 = private unnamed_addr constant [22 x i8] c"type assertion failed\00", align 1
 
 define void @main.init() {
 _llgo_0:
@@ -29,20 +31,35 @@ _llgo_0:
   call void @"github.com/goplus/llgo/internal/runtime.init"()
   call void @main.init()
   %2 = call ptr @"github.com/goplus/llgo/internal/runtime.AllocZ"(i64 48)
-  %3 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.iface", ptr %2, i64 0
+  %3 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %2, i64 0
   %4 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 2)
-  %5 = call %"github.com/goplus/llgo/internal/runtime.iface" @"github.com/goplus/llgo/internal/runtime.MakeAnyIntptr"(ptr %4, i64 1)
-  store %"github.com/goplus/llgo/internal/runtime.iface" %5, ptr %3, align 8
-  %6 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.iface", ptr %2, i64 1
-  %7 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 2)
-  %8 = call %"github.com/goplus/llgo/internal/runtime.iface" @"github.com/goplus/llgo/internal/runtime.MakeAnyIntptr"(ptr %7, i64 2)
-  store %"github.com/goplus/llgo/internal/runtime.iface" %8, ptr %6, align 8
-  %9 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.iface", ptr %2, i64 2
+  %5 = alloca %"github.com/goplus/llgo/internal/runtime.eface", align 8
+  %6 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %5, i32 0, i32 0
+  store ptr %4, ptr %6, align 8
+  %7 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %5, i32 0, i32 1
+  store ptr inttoptr (i64 1 to ptr), ptr %7, align 8
+  %8 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %5, align 8
+  store %"github.com/goplus/llgo/internal/runtime.eface" %8, ptr %3, align 8
+  %9 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %2, i64 1
   %10 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 2)
-  %11 = call %"github.com/goplus/llgo/internal/runtime.iface" @"github.com/goplus/llgo/internal/runtime.MakeAnyIntptr"(ptr %10, i64 3)
-  store %"github.com/goplus/llgo/internal/runtime.iface" %11, ptr %9, align 8
-  %12 = call %"github.com/goplus/llgo/internal/runtime.Slice" @"github.com/goplus/llgo/internal/runtime.NewSlice3"(ptr %2, i64 16, i64 3, i64 0, i64 3, i64 3)
-  call void @main.test(%"github.com/goplus/llgo/internal/runtime.Slice" %12)
+  %11 = alloca %"github.com/goplus/llgo/internal/runtime.eface", align 8
+  %12 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %11, i32 0, i32 0
+  store ptr %10, ptr %12, align 8
+  %13 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %11, i32 0, i32 1
+  store ptr inttoptr (i64 2 to ptr), ptr %13, align 8
+  %14 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %11, align 8
+  store %"github.com/goplus/llgo/internal/runtime.eface" %14, ptr %9, align 8
+  %15 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %2, i64 2
+  %16 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 2)
+  %17 = alloca %"github.com/goplus/llgo/internal/runtime.eface", align 8
+  %18 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %17, i32 0, i32 0
+  store ptr %16, ptr %18, align 8
+  %19 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %17, i32 0, i32 1
+  store ptr inttoptr (i64 3 to ptr), ptr %19, align 8
+  %20 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %17, align 8
+  store %"github.com/goplus/llgo/internal/runtime.eface" %20, ptr %15, align 8
+  %21 = call %"github.com/goplus/llgo/internal/runtime.Slice" @"github.com/goplus/llgo/internal/runtime.NewSlice3"(ptr %2, i64 16, i64 3, i64 0, i64 3, i64 3)
+  call void @main.test(%"github.com/goplus/llgo/internal/runtime.Slice" %21)
   ret i32 0
 }
 
@@ -51,7 +68,7 @@ _llgo_0:
   %1 = extractvalue %"github.com/goplus/llgo/internal/runtime.Slice" %0, 1
   br label %_llgo_1
 
-_llgo_1:                                          ; preds = %_llgo_2, %_llgo_0
+_llgo_1:                                          ; preds = %_llgo_4, %_llgo_0
   %2 = phi i64 [ -1, %_llgo_0 ], [ %3, %_llgo_2 ]
   %3 = add i64 %2, 1
   %4 = icmp slt i64 %3, %1
@@ -61,29 +78,43 @@ _llgo_2:                                          ; preds = %_llgo_1
   %5 = icmp slt i64 %3, 0
   call void @"github.com/goplus/llgo/internal/runtime.AssertIndexRange"(i1 %5)
   %6 = extractvalue %"github.com/goplus/llgo/internal/runtime.Slice" %0, 0
-  %7 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.iface", ptr %6, i64 %3
-  %8 = load %"github.com/goplus/llgo/internal/runtime.iface", ptr %7, align 8
-  %9 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 2)
-  %10 = call i64 @"github.com/goplus/llgo/internal/runtime.I2Int"(%"github.com/goplus/llgo/internal/runtime.iface" %8, ptr %9)
-  %11 = call i32 (ptr, ...) @printf(ptr @0, i64 %10)
-  br label %_llgo_1
+  %7 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %6, i64 %3
+  %8 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %7, align 8
+  %9 = extractvalue %"github.com/goplus/llgo/internal/runtime.eface" %8, 0
+  %10 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 2)
+  %11 = icmp eq ptr %9, %10
+  br i1 %11, label %_llgo_4, label %_llgo_5
 
 _llgo_3:                                          ; preds = %_llgo_1
   ret void
+
+_llgo_4:                                          ; preds = %_llgo_2
+  %12 = extractvalue %"github.com/goplus/llgo/internal/runtime.eface" %8, 1
+  %13 = ptrtoint ptr %12 to i64
+  %14 = call i32 (ptr, ...) @printf(ptr @0, i64 %13)
+  br label %_llgo_1
+
+_llgo_5:                                          ; preds = %_llgo_2
+  %15 = alloca %"github.com/goplus/llgo/internal/runtime.String", align 8
+  %16 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %15, i32 0, i32 0
+  store ptr @1, ptr %16, align 8
+  %17 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %15, i32 0, i32 1
+  store i64 21, ptr %17, align 4
+  %18 = load %"github.com/goplus/llgo/internal/runtime.String", ptr %15, align 8
+  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.String" %18)
+  unreachable
 }
 
 declare void @"github.com/goplus/llgo/internal/runtime.init"()
 
 declare ptr @"github.com/goplus/llgo/internal/runtime.AllocZ"(i64)
 
-declare %"github.com/goplus/llgo/internal/runtime.iface" @"github.com/goplus/llgo/internal/runtime.MakeAnyIntptr"(ptr, i64)
-
 declare ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64)
 
 declare %"github.com/goplus/llgo/internal/runtime.Slice" @"github.com/goplus/llgo/internal/runtime.NewSlice3"(ptr, i64, i64, i64, i64, i64)
 
 declare void @"github.com/goplus/llgo/internal/runtime.AssertIndexRange"(i1)
 
-declare i64 @"github.com/goplus/llgo/internal/runtime.I2Int"(%"github.com/goplus/llgo/internal/runtime.iface", ptr)
+declare void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface")
 
 declare i32 @printf(ptr, ...)
diff --git a/cl/_testrt/gotypes/in.go b/cl/_testrt/_gotypes/in.go
similarity index 100%
rename from cl/_testrt/gotypes/in.go
rename to cl/_testrt/_gotypes/in.go
diff --git a/cl/_testrt/gotypes/out.ll b/cl/_testrt/_gotypes/out.ll
similarity index 100%
rename from cl/_testrt/gotypes/out.ll
rename to cl/_testrt/_gotypes/out.ll
diff --git a/cl/_testrt/any/out.ll b/cl/_testrt/any/out.ll
index fbf58289..207fc6d3 100644
--- a/cl/_testrt/any/out.ll
+++ b/cl/_testrt/any/out.ll
@@ -1,19 +1,37 @@
 ; ModuleID = 'main'
 source_filename = "main"
 
-%"github.com/goplus/llgo/internal/runtime.iface" = type { ptr, ptr }
+%"github.com/goplus/llgo/internal/runtime.eface" = type { ptr, ptr }
+%"github.com/goplus/llgo/internal/runtime.String" = type { ptr, i64 }
 
 @"main.init$guard" = global ptr null
+@0 = private unnamed_addr constant [22 x i8] c"type assertion failed\00", align 1
 @__llgo_argc = global ptr null
 @__llgo_argv = global ptr null
-@0 = private unnamed_addr constant [10 x i8] c"Hello %d\0A\00", align 1
+@1 = private unnamed_addr constant [10 x i8] c"Hello %d\0A\00", align 1
 
-define i64 @main.incVal(%"github.com/goplus/llgo/internal/runtime.iface" %0) {
+define i64 @main.incVal(%"github.com/goplus/llgo/internal/runtime.eface" %0) {
 _llgo_0:
-  %1 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 2)
-  %2 = call i64 @"github.com/goplus/llgo/internal/runtime.I2Int"(%"github.com/goplus/llgo/internal/runtime.iface" %0, ptr %1)
-  %3 = add i64 %2, 1
-  ret i64 %3
+  %1 = extractvalue %"github.com/goplus/llgo/internal/runtime.eface" %0, 0
+  %2 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 2)
+  %3 = icmp eq ptr %1, %2
+  br i1 %3, label %_llgo_1, label %_llgo_2
+
+_llgo_1:                                          ; preds = %_llgo_0
+  %4 = extractvalue %"github.com/goplus/llgo/internal/runtime.eface" %0, 1
+  %5 = ptrtoint ptr %4 to i64
+  %6 = add i64 %5, 1
+  ret i64 %6
+
+_llgo_2:                                          ; preds = %_llgo_0
+  %7 = alloca %"github.com/goplus/llgo/internal/runtime.String", align 8
+  %8 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %7, i32 0, i32 0
+  store ptr @0, ptr %8, align 8
+  %9 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %7, i32 0, i32 1
+  store i64 21, ptr %9, align 4
+  %10 = load %"github.com/goplus/llgo/internal/runtime.String", ptr %7, align 8
+  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.String" %10)
+  unreachable
 }
 
 define void @main.init() {
@@ -36,18 +54,21 @@ _llgo_0:
   call void @"github.com/goplus/llgo/internal/runtime.init"()
   call void @main.init()
   %2 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 2)
-  %3 = call %"github.com/goplus/llgo/internal/runtime.iface" @"github.com/goplus/llgo/internal/runtime.MakeAnyIntptr"(ptr %2, i64 100)
-  %4 = call i64 @main.incVal(%"github.com/goplus/llgo/internal/runtime.iface" %3)
-  %5 = call i32 (ptr, ...) @printf(ptr @0, i64 %4)
+  %3 = alloca %"github.com/goplus/llgo/internal/runtime.eface", align 8
+  %4 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %3, i32 0, i32 0
+  store ptr %2, ptr %4, align 8
+  %5 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %3, i32 0, i32 1
+  store ptr inttoptr (i64 100 to ptr), ptr %5, align 8
+  %6 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %3, align 8
+  %7 = call i64 @main.incVal(%"github.com/goplus/llgo/internal/runtime.eface" %6)
+  %8 = call i32 (ptr, ...) @printf(ptr @1, i64 %7)
   ret i32 0
 }
 
-declare i64 @"github.com/goplus/llgo/internal/runtime.I2Int"(%"github.com/goplus/llgo/internal/runtime.iface", ptr)
-
 declare ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64)
 
+declare void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface")
+
 declare void @"github.com/goplus/llgo/internal/runtime.init"()
 
-declare %"github.com/goplus/llgo/internal/runtime.iface" @"github.com/goplus/llgo/internal/runtime.MakeAnyIntptr"(ptr, i64)
-
 declare i32 @printf(ptr, ...)
diff --git a/cl/_testrt/builtin/out.ll b/cl/_testrt/builtin/out.ll
index c921f898..9ff25dda 100644
--- a/cl/_testrt/builtin/out.ll
+++ b/cl/_testrt/builtin/out.ll
@@ -3,7 +3,7 @@ source_filename = "main"
 
 %"github.com/goplus/llgo/internal/runtime.Slice" = type { ptr, i64, i64 }
 %"github.com/goplus/llgo/internal/runtime.String" = type { ptr, i64 }
-%"github.com/goplus/llgo/internal/runtime.iface" = type { ptr, ptr }
+%"github.com/goplus/llgo/internal/runtime.eface" = type { ptr, ptr }
 
 @main.a = global ptr null
 @main.b = global ptr null
@@ -242,10 +242,15 @@ _llgo_0:
   call void @"github.com/goplus/llgo/internal/runtime.PrintByte"(i8 10)
   %107 = call ptr @"github.com/goplus/llgo/internal/runtime.AllocZ"(i64 16)
   %108 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 2)
-  %109 = call %"github.com/goplus/llgo/internal/runtime.iface" @"github.com/goplus/llgo/internal/runtime.MakeAnyIntptr"(ptr %108, i64 100)
-  store %"github.com/goplus/llgo/internal/runtime.iface" %109, ptr %107, align 8
-  %110 = load %"github.com/goplus/llgo/internal/runtime.iface", ptr %107, align 8
-  %111 = ptrtoint ptr %107 to i64
+  %109 = alloca %"github.com/goplus/llgo/internal/runtime.eface", align 8
+  %110 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %109, i32 0, i32 0
+  store ptr %108, ptr %110, align 8
+  %111 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %109, i32 0, i32 1
+  store ptr inttoptr (i64 100 to ptr), ptr %111, align 8
+  %112 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %109, align 8
+  store %"github.com/goplus/llgo/internal/runtime.eface" %112, ptr %107, align 8
+  %113 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %107, align 8
+  %114 = ptrtoint ptr %107 to i64
   call void @"github.com/goplus/llgo/internal/runtime.PrintBool"(i1 true)
   call void @"github.com/goplus/llgo/internal/runtime.PrintByte"(i8 32)
   call void @"github.com/goplus/llgo/internal/runtime.PrintInt"(i64 0)
@@ -262,83 +267,83 @@ _llgo_0:
   call void @"github.com/goplus/llgo/internal/runtime.PrintByte"(i8 32)
   call void @"github.com/goplus/llgo/internal/runtime.PrintFloat"(double 1.005000e+02)
   call void @"github.com/goplus/llgo/internal/runtime.PrintByte"(i8 32)
-  call void @"github.com/goplus/llgo/internal/runtime.PrintIface"(%"github.com/goplus/llgo/internal/runtime.iface" %110)
+  call void @"github.com/goplus/llgo/internal/runtime.PrintEface"(%"github.com/goplus/llgo/internal/runtime.eface" %113)
   call void @"github.com/goplus/llgo/internal/runtime.PrintByte"(i8 32)
   call void @"github.com/goplus/llgo/internal/runtime.PrintPointer"(ptr %107)
   call void @"github.com/goplus/llgo/internal/runtime.PrintByte"(i8 32)
-  call void @"github.com/goplus/llgo/internal/runtime.PrintUint"(i64 %111)
+  call void @"github.com/goplus/llgo/internal/runtime.PrintUint"(i64 %114)
   call void @"github.com/goplus/llgo/internal/runtime.PrintByte"(i8 10)
-  %112 = call ptr @"github.com/goplus/llgo/internal/runtime.AllocZ"(i64 3)
-  %113 = call ptr @"github.com/goplus/llgo/internal/runtime.AllocZ"(i64 8)
-  %114 = call %"github.com/goplus/llgo/internal/runtime.Slice" @"github.com/goplus/llgo/internal/runtime.NewSlice3"(ptr %112, i64 1, i64 3, i64 0, i64 3, i64 3)
-  %115 = extractvalue %"github.com/goplus/llgo/internal/runtime.Slice" %106, 0
-  %116 = extractvalue %"github.com/goplus/llgo/internal/runtime.Slice" %106, 1
-  %117 = call i64 @"github.com/goplus/llgo/internal/runtime.SliceCopy"(%"github.com/goplus/llgo/internal/runtime.Slice" %114, ptr %115, i64 %116, i64 1)
-  store i64 %117, ptr %113, align 4
-  %118 = load i64, ptr %113, align 4
-  %119 = getelementptr inbounds i8, ptr %112, i64 0
-  %120 = load i8, ptr %119, align 1
-  %121 = getelementptr inbounds i8, ptr %112, i64 1
-  %122 = load i8, ptr %121, align 1
-  %123 = getelementptr inbounds i8, ptr %112, i64 2
-  %124 = load i8, ptr %123, align 1
-  call void @"github.com/goplus/llgo/internal/runtime.PrintInt"(i64 %118)
+  %115 = call ptr @"github.com/goplus/llgo/internal/runtime.AllocZ"(i64 3)
+  %116 = call ptr @"github.com/goplus/llgo/internal/runtime.AllocZ"(i64 8)
+  %117 = call %"github.com/goplus/llgo/internal/runtime.Slice" @"github.com/goplus/llgo/internal/runtime.NewSlice3"(ptr %115, i64 1, i64 3, i64 0, i64 3, i64 3)
+  %118 = extractvalue %"github.com/goplus/llgo/internal/runtime.Slice" %106, 0
+  %119 = extractvalue %"github.com/goplus/llgo/internal/runtime.Slice" %106, 1
+  %120 = call i64 @"github.com/goplus/llgo/internal/runtime.SliceCopy"(%"github.com/goplus/llgo/internal/runtime.Slice" %117, ptr %118, i64 %119, i64 1)
+  store i64 %120, ptr %116, align 4
+  %121 = load i64, ptr %116, align 4
+  %122 = getelementptr inbounds i8, ptr %115, i64 0
+  %123 = load i8, ptr %122, align 1
+  %124 = getelementptr inbounds i8, ptr %115, i64 1
+  %125 = load i8, ptr %124, align 1
+  %126 = getelementptr inbounds i8, ptr %115, i64 2
+  %127 = load i8, ptr %126, align 1
+  call void @"github.com/goplus/llgo/internal/runtime.PrintInt"(i64 %121)
   call void @"github.com/goplus/llgo/internal/runtime.PrintByte"(i8 32)
-  %125 = zext i8 %120 to i64
-  call void @"github.com/goplus/llgo/internal/runtime.PrintUint"(i64 %125)
+  %128 = zext i8 %123 to i64
+  call void @"github.com/goplus/llgo/internal/runtime.PrintUint"(i64 %128)
   call void @"github.com/goplus/llgo/internal/runtime.PrintByte"(i8 32)
-  %126 = zext i8 %122 to i64
-  call void @"github.com/goplus/llgo/internal/runtime.PrintUint"(i64 %126)
+  %129 = zext i8 %125 to i64
+  call void @"github.com/goplus/llgo/internal/runtime.PrintUint"(i64 %129)
   call void @"github.com/goplus/llgo/internal/runtime.PrintByte"(i8 32)
-  %127 = zext i8 %124 to i64
-  call void @"github.com/goplus/llgo/internal/runtime.PrintUint"(i64 %127)
+  %130 = zext i8 %127 to i64
+  call void @"github.com/goplus/llgo/internal/runtime.PrintUint"(i64 %130)
   call void @"github.com/goplus/llgo/internal/runtime.PrintByte"(i8 10)
-  %128 = call %"github.com/goplus/llgo/internal/runtime.Slice" @"github.com/goplus/llgo/internal/runtime.NewSlice3"(ptr %112, i64 1, i64 3, i64 1, i64 3, i64 3)
-  %129 = alloca %"github.com/goplus/llgo/internal/runtime.String", align 8
-  %130 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %129, i32 0, i32 0
-  store ptr @5, ptr %130, align 8
-  %131 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %129, i32 0, i32 1
-  store i64 4, ptr %131, align 4
-  %132 = load %"github.com/goplus/llgo/internal/runtime.String", ptr %129, align 8
-  %133 = extractvalue %"github.com/goplus/llgo/internal/runtime.String" %132, 0
-  %134 = extractvalue %"github.com/goplus/llgo/internal/runtime.String" %132, 1
-  %135 = call i64 @"github.com/goplus/llgo/internal/runtime.SliceCopy"(%"github.com/goplus/llgo/internal/runtime.Slice" %128, ptr %133, i64 %134, i64 1)
-  store i64 %135, ptr %113, align 4
-  %136 = load i64, ptr %113, align 4
-  %137 = getelementptr inbounds i8, ptr %112, i64 0
-  %138 = load i8, ptr %137, align 1
-  %139 = getelementptr inbounds i8, ptr %112, i64 1
-  %140 = load i8, ptr %139, align 1
-  %141 = getelementptr inbounds i8, ptr %112, i64 2
-  %142 = load i8, ptr %141, align 1
-  call void @"github.com/goplus/llgo/internal/runtime.PrintInt"(i64 %136)
+  %131 = call %"github.com/goplus/llgo/internal/runtime.Slice" @"github.com/goplus/llgo/internal/runtime.NewSlice3"(ptr %115, i64 1, i64 3, i64 1, i64 3, i64 3)
+  %132 = alloca %"github.com/goplus/llgo/internal/runtime.String", align 8
+  %133 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %132, i32 0, i32 0
+  store ptr @5, ptr %133, align 8
+  %134 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %132, i32 0, i32 1
+  store i64 4, ptr %134, align 4
+  %135 = load %"github.com/goplus/llgo/internal/runtime.String", ptr %132, align 8
+  %136 = extractvalue %"github.com/goplus/llgo/internal/runtime.String" %135, 0
+  %137 = extractvalue %"github.com/goplus/llgo/internal/runtime.String" %135, 1
+  %138 = call i64 @"github.com/goplus/llgo/internal/runtime.SliceCopy"(%"github.com/goplus/llgo/internal/runtime.Slice" %131, ptr %136, i64 %137, i64 1)
+  store i64 %138, ptr %116, align 4
+  %139 = load i64, ptr %116, align 4
+  %140 = getelementptr inbounds i8, ptr %115, i64 0
+  %141 = load i8, ptr %140, align 1
+  %142 = getelementptr inbounds i8, ptr %115, i64 1
+  %143 = load i8, ptr %142, align 1
+  %144 = getelementptr inbounds i8, ptr %115, i64 2
+  %145 = load i8, ptr %144, align 1
+  call void @"github.com/goplus/llgo/internal/runtime.PrintInt"(i64 %139)
   call void @"github.com/goplus/llgo/internal/runtime.PrintByte"(i8 32)
-  %143 = zext i8 %138 to i64
-  call void @"github.com/goplus/llgo/internal/runtime.PrintUint"(i64 %143)
+  %146 = zext i8 %141 to i64
+  call void @"github.com/goplus/llgo/internal/runtime.PrintUint"(i64 %146)
   call void @"github.com/goplus/llgo/internal/runtime.PrintByte"(i8 32)
-  %144 = zext i8 %140 to i64
-  call void @"github.com/goplus/llgo/internal/runtime.PrintUint"(i64 %144)
+  %147 = zext i8 %143 to i64
+  call void @"github.com/goplus/llgo/internal/runtime.PrintUint"(i64 %147)
   call void @"github.com/goplus/llgo/internal/runtime.PrintByte"(i8 32)
-  %145 = zext i8 %142 to i64
-  call void @"github.com/goplus/llgo/internal/runtime.PrintUint"(i64 %145)
+  %148 = zext i8 %145 to i64
+  call void @"github.com/goplus/llgo/internal/runtime.PrintUint"(i64 %148)
   call void @"github.com/goplus/llgo/internal/runtime.PrintByte"(i8 10)
-  %146 = call ptr @"github.com/goplus/llgo/internal/runtime.AllocU"(i64 8)
-  %147 = getelementptr inbounds { ptr }, ptr %146, i32 0, i32 0
-  store ptr %113, ptr %147, align 8
-  %148 = alloca { ptr, ptr }, align 8
-  %149 = getelementptr inbounds { ptr, ptr }, ptr %148, i32 0, i32 0
-  store ptr @"main.main$2", ptr %149, align 8
-  %150 = getelementptr inbounds { ptr, ptr }, ptr %148, i32 0, i32 1
-  store ptr %146, ptr %150, align 8
-  %151 = load { ptr, ptr }, ptr %148, align 8
+  %149 = call ptr @"github.com/goplus/llgo/internal/runtime.AllocU"(i64 8)
+  %150 = getelementptr inbounds { ptr }, ptr %149, i32 0, i32 0
+  store ptr %116, ptr %150, align 8
+  %151 = alloca { ptr, ptr }, align 8
+  %152 = getelementptr inbounds { ptr, ptr }, ptr %151, i32 0, i32 0
+  store ptr @"main.main$2", ptr %152, align 8
+  %153 = getelementptr inbounds { ptr, ptr }, ptr %151, i32 0, i32 1
+  store ptr %149, ptr %153, align 8
+  %154 = load { ptr, ptr }, ptr %151, align 8
   call void @"github.com/goplus/llgo/internal/runtime.PrintPointer"(ptr @main.demo)
   call void @"github.com/goplus/llgo/internal/runtime.PrintByte"(i8 32)
   call void @"github.com/goplus/llgo/internal/runtime.PrintPointer"(ptr @main.demo)
   call void @"github.com/goplus/llgo/internal/runtime.PrintByte"(i8 32)
   call void @"github.com/goplus/llgo/internal/runtime.PrintPointer"(ptr @"main.main$1")
   call void @"github.com/goplus/llgo/internal/runtime.PrintByte"(i8 32)
-  %152 = extractvalue { ptr, ptr } %151, 0
-  call void @"github.com/goplus/llgo/internal/runtime.PrintPointer"(ptr %152)
+  %155 = extractvalue { ptr, ptr } %154, 0
+  call void @"github.com/goplus/llgo/internal/runtime.PrintPointer"(ptr %155)
   call void @"github.com/goplus/llgo/internal/runtime.PrintByte"(i8 10)
   ret i32 0
 }
@@ -361,8 +366,6 @@ declare void @"github.com/goplus/llgo/internal/runtime.PrintString"(%"github.com
 
 declare %"github.com/goplus/llgo/internal/runtime.Slice" @"github.com/goplus/llgo/internal/runtime.SliceAppend"(%"github.com/goplus/llgo/internal/runtime.Slice", ptr, i64, i64)
 
-declare %"github.com/goplus/llgo/internal/runtime.iface" @"github.com/goplus/llgo/internal/runtime.MakeAnyIntptr"(ptr, i64)
-
 declare ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64)
 
 declare void @"github.com/goplus/llgo/internal/runtime.PrintBool"(i1)
@@ -371,7 +374,7 @@ declare void @"github.com/goplus/llgo/internal/runtime.PrintUint"(i64)
 
 declare void @"github.com/goplus/llgo/internal/runtime.PrintFloat"(double)
 
-declare void @"github.com/goplus/llgo/internal/runtime.PrintIface"(%"github.com/goplus/llgo/internal/runtime.iface")
+declare void @"github.com/goplus/llgo/internal/runtime.PrintEface"(%"github.com/goplus/llgo/internal/runtime.eface")
 
 declare void @"github.com/goplus/llgo/internal/runtime.PrintPointer"(ptr)
 
diff --git a/cl/_testrt/cast/out.ll b/cl/_testrt/cast/out.ll
index b6739dbb..794eea9e 100644
--- a/cl/_testrt/cast/out.ll
+++ b/cl/_testrt/cast/out.ll
@@ -2,7 +2,7 @@
 source_filename = "main"
 
 %"github.com/goplus/llgo/internal/runtime.String" = type { ptr, i64 }
-%"github.com/goplus/llgo/internal/runtime.iface" = type { ptr, ptr }
+%"github.com/goplus/llgo/internal/runtime.eface" = type { ptr, ptr }
 
 @"main.init$guard" = global ptr null
 @0 = private unnamed_addr constant [6 x i8] c"error\00", align 1
@@ -34,8 +34,16 @@ _llgo_1:                                          ; preds = %_llgo_0
   %6 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %4, i32 0, i32 1
   store i64 5, ptr %6, align 4
   %7 = load %"github.com/goplus/llgo/internal/runtime.String", ptr %4, align 8
-  %8 = call %"github.com/goplus/llgo/internal/runtime.iface" @"github.com/goplus/llgo/internal/runtime.MakeAnyString"(%"github.com/goplus/llgo/internal/runtime.String" %7)
-  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.iface" %8)
+  %8 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 24)
+  %9 = call ptr @"github.com/goplus/llgo/internal/runtime.AllocU"(i64 16)
+  store %"github.com/goplus/llgo/internal/runtime.String" %7, ptr %9, align 8
+  %10 = alloca %"github.com/goplus/llgo/internal/runtime.eface", align 8
+  %11 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, i32 0, i32 0
+  store ptr %8, ptr %11, align 8
+  %12 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, i32 0, i32 1
+  store ptr %9, ptr %12, align 8
+  %13 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, align 8
+  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface" %13)
   unreachable
 
 _llgo_2:                                          ; preds = %_llgo_0
@@ -55,8 +63,16 @@ _llgo_1:                                          ; preds = %_llgo_0
   %6 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %4, i32 0, i32 1
   store i64 5, ptr %6, align 4
   %7 = load %"github.com/goplus/llgo/internal/runtime.String", ptr %4, align 8
-  %8 = call %"github.com/goplus/llgo/internal/runtime.iface" @"github.com/goplus/llgo/internal/runtime.MakeAnyString"(%"github.com/goplus/llgo/internal/runtime.String" %7)
-  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.iface" %8)
+  %8 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 24)
+  %9 = call ptr @"github.com/goplus/llgo/internal/runtime.AllocU"(i64 16)
+  store %"github.com/goplus/llgo/internal/runtime.String" %7, ptr %9, align 8
+  %10 = alloca %"github.com/goplus/llgo/internal/runtime.eface", align 8
+  %11 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, i32 0, i32 0
+  store ptr %8, ptr %11, align 8
+  %12 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, i32 0, i32 1
+  store ptr %9, ptr %12, align 8
+  %13 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, align 8
+  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface" %13)
   unreachable
 
 _llgo_2:                                          ; preds = %_llgo_0
@@ -76,8 +92,16 @@ _llgo_1:                                          ; preds = %_llgo_0
   %6 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %4, i32 0, i32 1
   store i64 5, ptr %6, align 4
   %7 = load %"github.com/goplus/llgo/internal/runtime.String", ptr %4, align 8
-  %8 = call %"github.com/goplus/llgo/internal/runtime.iface" @"github.com/goplus/llgo/internal/runtime.MakeAnyString"(%"github.com/goplus/llgo/internal/runtime.String" %7)
-  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.iface" %8)
+  %8 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 24)
+  %9 = call ptr @"github.com/goplus/llgo/internal/runtime.AllocU"(i64 16)
+  store %"github.com/goplus/llgo/internal/runtime.String" %7, ptr %9, align 8
+  %10 = alloca %"github.com/goplus/llgo/internal/runtime.eface", align 8
+  %11 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, i32 0, i32 0
+  store ptr %8, ptr %11, align 8
+  %12 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, i32 0, i32 1
+  store ptr %9, ptr %12, align 8
+  %13 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, align 8
+  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface" %13)
   unreachable
 
 _llgo_2:                                          ; preds = %_llgo_0
@@ -97,8 +121,16 @@ _llgo_1:                                          ; preds = %_llgo_0
   %6 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %4, i32 0, i32 1
   store i64 5, ptr %6, align 4
   %7 = load %"github.com/goplus/llgo/internal/runtime.String", ptr %4, align 8
-  %8 = call %"github.com/goplus/llgo/internal/runtime.iface" @"github.com/goplus/llgo/internal/runtime.MakeAnyString"(%"github.com/goplus/llgo/internal/runtime.String" %7)
-  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.iface" %8)
+  %8 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 24)
+  %9 = call ptr @"github.com/goplus/llgo/internal/runtime.AllocU"(i64 16)
+  store %"github.com/goplus/llgo/internal/runtime.String" %7, ptr %9, align 8
+  %10 = alloca %"github.com/goplus/llgo/internal/runtime.eface", align 8
+  %11 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, i32 0, i32 0
+  store ptr %8, ptr %11, align 8
+  %12 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, i32 0, i32 1
+  store ptr %9, ptr %12, align 8
+  %13 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, align 8
+  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface" %13)
   unreachable
 
 _llgo_2:                                          ; preds = %_llgo_0
@@ -118,8 +150,16 @@ _llgo_1:                                          ; preds = %_llgo_0
   %6 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %4, i32 0, i32 1
   store i64 5, ptr %6, align 4
   %7 = load %"github.com/goplus/llgo/internal/runtime.String", ptr %4, align 8
-  %8 = call %"github.com/goplus/llgo/internal/runtime.iface" @"github.com/goplus/llgo/internal/runtime.MakeAnyString"(%"github.com/goplus/llgo/internal/runtime.String" %7)
-  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.iface" %8)
+  %8 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 24)
+  %9 = call ptr @"github.com/goplus/llgo/internal/runtime.AllocU"(i64 16)
+  store %"github.com/goplus/llgo/internal/runtime.String" %7, ptr %9, align 8
+  %10 = alloca %"github.com/goplus/llgo/internal/runtime.eface", align 8
+  %11 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, i32 0, i32 0
+  store ptr %8, ptr %11, align 8
+  %12 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, i32 0, i32 1
+  store ptr %9, ptr %12, align 8
+  %13 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, align 8
+  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface" %13)
   unreachable
 
 _llgo_2:                                          ; preds = %_llgo_0
@@ -139,8 +179,16 @@ _llgo_1:                                          ; preds = %_llgo_0
   %6 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %4, i32 0, i32 1
   store i64 5, ptr %6, align 4
   %7 = load %"github.com/goplus/llgo/internal/runtime.String", ptr %4, align 8
-  %8 = call %"github.com/goplus/llgo/internal/runtime.iface" @"github.com/goplus/llgo/internal/runtime.MakeAnyString"(%"github.com/goplus/llgo/internal/runtime.String" %7)
-  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.iface" %8)
+  %8 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 24)
+  %9 = call ptr @"github.com/goplus/llgo/internal/runtime.AllocU"(i64 16)
+  store %"github.com/goplus/llgo/internal/runtime.String" %7, ptr %9, align 8
+  %10 = alloca %"github.com/goplus/llgo/internal/runtime.eface", align 8
+  %11 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, i32 0, i32 0
+  store ptr %8, ptr %11, align 8
+  %12 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, i32 0, i32 1
+  store ptr %9, ptr %12, align 8
+  %13 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, align 8
+  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface" %13)
   unreachable
 
 _llgo_2:                                          ; preds = %_llgo_0
@@ -160,8 +208,16 @@ _llgo_1:                                          ; preds = %_llgo_0
   %6 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %4, i32 0, i32 1
   store i64 5, ptr %6, align 4
   %7 = load %"github.com/goplus/llgo/internal/runtime.String", ptr %4, align 8
-  %8 = call %"github.com/goplus/llgo/internal/runtime.iface" @"github.com/goplus/llgo/internal/runtime.MakeAnyString"(%"github.com/goplus/llgo/internal/runtime.String" %7)
-  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.iface" %8)
+  %8 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 24)
+  %9 = call ptr @"github.com/goplus/llgo/internal/runtime.AllocU"(i64 16)
+  store %"github.com/goplus/llgo/internal/runtime.String" %7, ptr %9, align 8
+  %10 = alloca %"github.com/goplus/llgo/internal/runtime.eface", align 8
+  %11 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, i32 0, i32 0
+  store ptr %8, ptr %11, align 8
+  %12 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, i32 0, i32 1
+  store ptr %9, ptr %12, align 8
+  %13 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, align 8
+  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface" %13)
   unreachable
 
 _llgo_2:                                          ; preds = %_llgo_0
@@ -181,8 +237,16 @@ _llgo_1:                                          ; preds = %_llgo_0
   %6 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %4, i32 0, i32 1
   store i64 5, ptr %6, align 4
   %7 = load %"github.com/goplus/llgo/internal/runtime.String", ptr %4, align 8
-  %8 = call %"github.com/goplus/llgo/internal/runtime.iface" @"github.com/goplus/llgo/internal/runtime.MakeAnyString"(%"github.com/goplus/llgo/internal/runtime.String" %7)
-  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.iface" %8)
+  %8 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 24)
+  %9 = call ptr @"github.com/goplus/llgo/internal/runtime.AllocU"(i64 16)
+  store %"github.com/goplus/llgo/internal/runtime.String" %7, ptr %9, align 8
+  %10 = alloca %"github.com/goplus/llgo/internal/runtime.eface", align 8
+  %11 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, i32 0, i32 0
+  store ptr %8, ptr %11, align 8
+  %12 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, i32 0, i32 1
+  store ptr %9, ptr %12, align 8
+  %13 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, align 8
+  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface" %13)
   unreachable
 
 _llgo_2:                                          ; preds = %_llgo_0
@@ -202,8 +266,16 @@ _llgo_1:                                          ; preds = %_llgo_0
   %6 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %4, i32 0, i32 1
   store i64 5, ptr %6, align 4
   %7 = load %"github.com/goplus/llgo/internal/runtime.String", ptr %4, align 8
-  %8 = call %"github.com/goplus/llgo/internal/runtime.iface" @"github.com/goplus/llgo/internal/runtime.MakeAnyString"(%"github.com/goplus/llgo/internal/runtime.String" %7)
-  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.iface" %8)
+  %8 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 24)
+  %9 = call ptr @"github.com/goplus/llgo/internal/runtime.AllocU"(i64 16)
+  store %"github.com/goplus/llgo/internal/runtime.String" %7, ptr %9, align 8
+  %10 = alloca %"github.com/goplus/llgo/internal/runtime.eface", align 8
+  %11 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, i32 0, i32 0
+  store ptr %8, ptr %11, align 8
+  %12 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, i32 0, i32 1
+  store ptr %9, ptr %12, align 8
+  %13 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, align 8
+  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface" %13)
   unreachable
 
 _llgo_2:                                          ; preds = %_llgo_0
@@ -223,8 +295,16 @@ _llgo_1:                                          ; preds = %_llgo_0
   %6 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %4, i32 0, i32 1
   store i64 5, ptr %6, align 4
   %7 = load %"github.com/goplus/llgo/internal/runtime.String", ptr %4, align 8
-  %8 = call %"github.com/goplus/llgo/internal/runtime.iface" @"github.com/goplus/llgo/internal/runtime.MakeAnyString"(%"github.com/goplus/llgo/internal/runtime.String" %7)
-  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.iface" %8)
+  %8 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 24)
+  %9 = call ptr @"github.com/goplus/llgo/internal/runtime.AllocU"(i64 16)
+  store %"github.com/goplus/llgo/internal/runtime.String" %7, ptr %9, align 8
+  %10 = alloca %"github.com/goplus/llgo/internal/runtime.eface", align 8
+  %11 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, i32 0, i32 0
+  store ptr %8, ptr %11, align 8
+  %12 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, i32 0, i32 1
+  store ptr %9, ptr %12, align 8
+  %13 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, align 8
+  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface" %13)
   unreachable
 
 _llgo_2:                                          ; preds = %_llgo_0
@@ -244,8 +324,16 @@ _llgo_1:                                          ; preds = %_llgo_0
   %6 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %4, i32 0, i32 1
   store i64 5, ptr %6, align 4
   %7 = load %"github.com/goplus/llgo/internal/runtime.String", ptr %4, align 8
-  %8 = call %"github.com/goplus/llgo/internal/runtime.iface" @"github.com/goplus/llgo/internal/runtime.MakeAnyString"(%"github.com/goplus/llgo/internal/runtime.String" %7)
-  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.iface" %8)
+  %8 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 24)
+  %9 = call ptr @"github.com/goplus/llgo/internal/runtime.AllocU"(i64 16)
+  store %"github.com/goplus/llgo/internal/runtime.String" %7, ptr %9, align 8
+  %10 = alloca %"github.com/goplus/llgo/internal/runtime.eface", align 8
+  %11 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, i32 0, i32 0
+  store ptr %8, ptr %11, align 8
+  %12 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, i32 0, i32 1
+  store ptr %9, ptr %12, align 8
+  %13 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, align 8
+  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface" %13)
   unreachable
 
 _llgo_2:                                          ; preds = %_llgo_0
@@ -265,24 +353,40 @@ _llgo_1:                                          ; preds = %_llgo_0
   %6 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %4, i32 0, i32 1
   store i64 5, ptr %6, align 4
   %7 = load %"github.com/goplus/llgo/internal/runtime.String", ptr %4, align 8
-  %8 = call %"github.com/goplus/llgo/internal/runtime.iface" @"github.com/goplus/llgo/internal/runtime.MakeAnyString"(%"github.com/goplus/llgo/internal/runtime.String" %7)
-  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.iface" %8)
+  %8 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 24)
+  %9 = call ptr @"github.com/goplus/llgo/internal/runtime.AllocU"(i64 16)
+  store %"github.com/goplus/llgo/internal/runtime.String" %7, ptr %9, align 8
+  %10 = alloca %"github.com/goplus/llgo/internal/runtime.eface", align 8
+  %11 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, i32 0, i32 0
+  store ptr %8, ptr %11, align 8
+  %12 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, i32 0, i32 1
+  store ptr %9, ptr %12, align 8
+  %13 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %10, align 8
+  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface" %13)
   unreachable
 
 _llgo_2:                                          ; preds = %_llgo_0
-  %9 = trunc i64 %1 to i32
-  %10 = icmp ne i32 %9, %0
-  br i1 %10, label %_llgo_3, label %_llgo_4
+  %14 = trunc i64 %1 to i32
+  %15 = icmp ne i32 %14, %0
+  br i1 %15, label %_llgo_3, label %_llgo_4
 
 _llgo_3:                                          ; preds = %_llgo_2
-  %11 = alloca %"github.com/goplus/llgo/internal/runtime.String", align 8
-  %12 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %11, i32 0, i32 0
-  store ptr @12, ptr %12, align 8
-  %13 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %11, i32 0, i32 1
-  store i64 5, ptr %13, align 4
-  %14 = load %"github.com/goplus/llgo/internal/runtime.String", ptr %11, align 8
-  %15 = call %"github.com/goplus/llgo/internal/runtime.iface" @"github.com/goplus/llgo/internal/runtime.MakeAnyString"(%"github.com/goplus/llgo/internal/runtime.String" %14)
-  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.iface" %15)
+  %16 = alloca %"github.com/goplus/llgo/internal/runtime.String", align 8
+  %17 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %16, i32 0, i32 0
+  store ptr @12, ptr %17, align 8
+  %18 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %16, i32 0, i32 1
+  store i64 5, ptr %18, align 4
+  %19 = load %"github.com/goplus/llgo/internal/runtime.String", ptr %16, align 8
+  %20 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 24)
+  %21 = call ptr @"github.com/goplus/llgo/internal/runtime.AllocU"(i64 16)
+  store %"github.com/goplus/llgo/internal/runtime.String" %19, ptr %21, align 8
+  %22 = alloca %"github.com/goplus/llgo/internal/runtime.eface", align 8
+  %23 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %22, i32 0, i32 0
+  store ptr %20, ptr %23, align 8
+  %24 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %22, i32 0, i32 1
+  store ptr %21, ptr %24, align 8
+  %25 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %22, align 8
+  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface" %25)
   unreachable
 
 _llgo_4:                                          ; preds = %_llgo_2
@@ -366,8 +470,10 @@ _llgo_0:
   ret i32 0
 }
 
-declare %"github.com/goplus/llgo/internal/runtime.iface" @"github.com/goplus/llgo/internal/runtime.MakeAnyString"(%"github.com/goplus/llgo/internal/runtime.String")
+declare ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64)
 
-declare void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.iface")
+declare ptr @"github.com/goplus/llgo/internal/runtime.AllocU"(i64)
+
+declare void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface")
 
 declare void @"github.com/goplus/llgo/internal/runtime.init"()
diff --git a/cl/_testrt/panic/out.ll b/cl/_testrt/panic/out.ll
index f8923d33..362b3bb2 100644
--- a/cl/_testrt/panic/out.ll
+++ b/cl/_testrt/panic/out.ll
@@ -2,7 +2,7 @@
 source_filename = "main"
 
 %"github.com/goplus/llgo/internal/runtime.String" = type { ptr, i64 }
-%"github.com/goplus/llgo/internal/runtime.iface" = type { ptr, ptr }
+%"github.com/goplus/llgo/internal/runtime.eface" = type { ptr, ptr }
 
 @"main.init$guard" = global ptr null
 @__llgo_argc = global ptr null
@@ -34,13 +34,23 @@ _llgo_0:
   %4 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %2, i32 0, i32 1
   store i64 13, ptr %4, align 4
   %5 = load %"github.com/goplus/llgo/internal/runtime.String", ptr %2, align 8
-  %6 = call %"github.com/goplus/llgo/internal/runtime.iface" @"github.com/goplus/llgo/internal/runtime.MakeAnyString"(%"github.com/goplus/llgo/internal/runtime.String" %5)
-  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.iface" %6)
+  %6 = call ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64 24)
+  %7 = call ptr @"github.com/goplus/llgo/internal/runtime.AllocU"(i64 16)
+  store %"github.com/goplus/llgo/internal/runtime.String" %5, ptr %7, align 8
+  %8 = alloca %"github.com/goplus/llgo/internal/runtime.eface", align 8
+  %9 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %8, i32 0, i32 0
+  store ptr %6, ptr %9, align 8
+  %10 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.eface", ptr %8, i32 0, i32 1
+  store ptr %7, ptr %10, align 8
+  %11 = load %"github.com/goplus/llgo/internal/runtime.eface", ptr %8, align 8
+  call void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface" %11)
   unreachable
 }
 
 declare void @"github.com/goplus/llgo/internal/runtime.init"()
 
-declare %"github.com/goplus/llgo/internal/runtime.iface" @"github.com/goplus/llgo/internal/runtime.MakeAnyString"(%"github.com/goplus/llgo/internal/runtime.String")
+declare ptr @"github.com/goplus/llgo/internal/runtime.Basic"(i64)
 
-declare void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.iface")
+declare ptr @"github.com/goplus/llgo/internal/runtime.AllocU"(i64)
+
+declare void @"github.com/goplus/llgo/internal/runtime.TracePanic"(%"github.com/goplus/llgo/internal/runtime.eface")
diff --git a/internal/abi/llgo_autogen.lla b/internal/abi/llgo_autogen.lla
index 505458a8..def779e5 100644
Binary files a/internal/abi/llgo_autogen.lla and b/internal/abi/llgo_autogen.lla differ
diff --git a/internal/runtime/llgo_autogen.lla b/internal/runtime/llgo_autogen.lla
index 3bb1386b..d0d0e4d2 100644
Binary files a/internal/runtime/llgo_autogen.lla and b/internal/runtime/llgo_autogen.lla differ
diff --git a/ssa/abi/abi.go b/ssa/abi/abi.go
index 05b09df6..042755f8 100644
--- a/ssa/abi/abi.go
+++ b/ssa/abi/abi.go
@@ -22,10 +22,25 @@ import (
 	"fmt"
 	"go/types"
 	"hash"
+
+	"github.com/goplus/llgo/internal/abi"
 )
 
 // -----------------------------------------------------------------------------
 
+func BasicKind(t *types.Basic) abi.Kind {
+	kind := t.Kind()
+	switch kind {
+	case types.String:
+		return abi.String
+	case types.UnsafePointer:
+		return abi.UnsafePointer
+	}
+	return abi.Kind(kind)
+}
+
+// -----------------------------------------------------------------------------
+
 type Kind int
 
 const (
diff --git a/ssa/interface.go b/ssa/interface.go
index 75958cbb..bc4fb6e2 100644
--- a/ssa/interface.go
+++ b/ssa/interface.go
@@ -36,7 +36,8 @@ func (b Builder) abiBasic(t *types.Basic) Expr {
 		g := b.Pkg.NewVarFrom(name, b.Prog.AbiTypePtrPtr())
 		return b.Load(g.Expr)
 	*/
-	return b.InlineCall(b.Pkg.rtFunc("Basic"), b.Prog.Val(int(t.Kind())))
+	kind := int(abi.BasicKind(t))
+	return b.InlineCall(b.Pkg.rtFunc("Basic"), b.Prog.Val(kind))
 }
 
 // abiStruct returns the abi type of the specified struct type.