diff --git a/cl/_testlibgo/complex/in.go b/cl/_testlibgo/complex/in.go
new file mode 100644
index 00000000..7610e171
--- /dev/null
+++ b/cl/_testlibgo/complex/in.go
@@ -0,0 +1,9 @@
+package main
+
+import (
+	"math/cmplx"
+)
+
+func main() {
+	println("abs(3+4i):", cmplx.Abs(3+4i))
+}
diff --git a/cl/_testlibgo/complex/out.ll b/cl/_testlibgo/complex/out.ll
new file mode 100644
index 00000000..abd63e4e
--- /dev/null
+++ b/cl/_testlibgo/complex/out.ll
@@ -0,0 +1,55 @@
+; ModuleID = 'main'
+source_filename = "main"
+
+%"github.com/goplus/llgo/internal/runtime.String" = type { ptr, i64 }
+
+@"main.init$guard" = global i1 false, align 1
+@__llgo_argc = global i32 0, align 4
+@__llgo_argv = global ptr null, align 8
+@0 = private unnamed_addr constant [10 x i8] c"abs(3+4i):", align 1
+
+define void @main.init() {
+_llgo_0:
+  %0 = load i1, ptr @"main.init$guard", align 1
+  br i1 %0, label %_llgo_2, label %_llgo_1
+
+_llgo_1:                                          ; preds = %_llgo_0
+  store i1 true, ptr @"main.init$guard", align 1
+  call void @"math/cmplx.init"()
+  br label %_llgo_2
+
+_llgo_2:                                          ; preds = %_llgo_1, %_llgo_0
+  ret void
+}
+
+define i32 @main(i32 %0, ptr %1) {
+_llgo_0:
+  store i32 %0, ptr @__llgo_argc, align 4
+  store ptr %1, ptr @__llgo_argv, align 8
+  call void @"github.com/goplus/llgo/internal/runtime.init"()
+  call void @main.init()
+  %2 = call double @"math/cmplx.Abs"({ double, double } { double 3.000000e+00, double 4.000000e+00 })
+  %3 = alloca %"github.com/goplus/llgo/internal/runtime.String", align 8
+  %4 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %3, i32 0, i32 0
+  store ptr @0, ptr %4, align 8
+  %5 = getelementptr inbounds %"github.com/goplus/llgo/internal/runtime.String", ptr %3, i32 0, i32 1
+  store i64 10, ptr %5, align 4
+  %6 = load %"github.com/goplus/llgo/internal/runtime.String", ptr %3, align 8
+  call void @"github.com/goplus/llgo/internal/runtime.PrintString"(%"github.com/goplus/llgo/internal/runtime.String" %6)
+  call void @"github.com/goplus/llgo/internal/runtime.PrintByte"(i8 32)
+  call void @"github.com/goplus/llgo/internal/runtime.PrintFloat"(double %2)
+  call void @"github.com/goplus/llgo/internal/runtime.PrintByte"(i8 10)
+  ret i32 0
+}
+
+declare void @"math/cmplx.init"()
+
+declare void @"github.com/goplus/llgo/internal/runtime.init"()
+
+declare double @"math/cmplx.Abs"({ double, double })
+
+declare void @"github.com/goplus/llgo/internal/runtime.PrintString"(%"github.com/goplus/llgo/internal/runtime.String")
+
+declare void @"github.com/goplus/llgo/internal/runtime.PrintByte"(i8)
+
+declare void @"github.com/goplus/llgo/internal/runtime.PrintFloat"(double)
diff --git a/ssa/cl_test.go b/ssa/cl_test.go
index cea2ce03..837a990a 100644
--- a/ssa/cl_test.go
+++ b/ssa/cl_test.go
@@ -29,6 +29,10 @@ func init() {
 	ssa.SetDebug(ssa.DbgFlagAll)
 }
 
+func TestFromTestlibgo(t *testing.T) {
+	cltest.FromDir(t, "", "../cl/_testlibgo", false)
+}
+
 func TestFromTestgo(t *testing.T) {
 	cltest.FromDir(t, "", "../cl/_testgo", false)
 }