diff --git a/cl/_testrt/qsort/in.go b/cl/_testrt/qsort/in.go
new file mode 100644
index 00000000..b4c65417
--- /dev/null
+++ b/cl/_testrt/qsort/in.go
@@ -0,0 +1,20 @@
+package main
+
+import (
+	"unsafe"
+
+	"github.com/goplus/llgo/internal/runtime/c"
+)
+
+//go:linkname qsort C.qsort
+func qsort(base c.Pointer, count, elem uintptr, compar func(a, b c.Pointer) c.Int)
+
+func main() {
+	a := [...]int{100, 8, 23, 2, 7}
+	qsort(c.Pointer(&a[0]), 5, unsafe.Sizeof(0), func(a, b c.Pointer) c.Int {
+		return c.Int(*(*int)(a) - *(*int)(b))
+	})
+	for _, v := range a {
+		c.Printf(c.Str("%d\n"), v)
+	}
+}
diff --git a/cl/_testrt/qsort/out.ll b/cl/_testrt/qsort/out.ll
new file mode 100644
index 00000000..fc5a788d
--- /dev/null
+++ b/cl/_testrt/qsort/out.ll
@@ -0,0 +1,64 @@
+; ModuleID = 'main'
+source_filename = "main"
+
+@"main.init$guard" = global ptr null
+@0 = private unnamed_addr constant [4 x i8] c"%d\0A\00", align 1
+
+define void @main.init() {
+_llgo_0:
+  %0 = load i1, ptr @"main.init$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
+  br label %_llgo_2
+
+_llgo_2:                                          ; preds = %_llgo_1, %_llgo_0
+  ret void
+}
+
+define void @main() {
+_llgo_0:
+  call void @"github.com/goplus/llgo/internal/runtime.init"()
+  call void @main.init()
+  %0 = call ptr @"github.com/goplus/llgo/internal/runtime.Alloc"(i64 40)
+  %1 = getelementptr inbounds i64, ptr %0, i64 0
+  %2 = getelementptr inbounds i64, ptr %0, i64 1
+  %3 = getelementptr inbounds i64, ptr %0, i64 2
+  %4 = getelementptr inbounds i64, ptr %0, i64 3
+  %5 = getelementptr inbounds i64, ptr %0, i64 4
+  store i64 100, ptr %1, align 4
+  store i64 8, ptr %2, align 4
+  store i64 23, ptr %3, align 4
+  store i64 2, ptr %4, align 4
+  store i64 7, ptr %5, align 4
+  %6 = getelementptr inbounds i64, ptr %0, i64 0
+  call void @qsort(ptr %6, i64 5, i64 8, ptr @"main.main$1")
+  %7 = load [5 x i64], ptr %0, align 4
+  br label %_llgo_1
+
+_llgo_1:                                          ; preds = %_llgo_2, %_llgo_0
+  %8 = phi i64 [ -1, %_llgo_0 ], [ %9, %_llgo_2 ]
+  %9 = add i64 %8, 1
+  %10 = icmp slt i64 %9, 5
+  br i1 %10, label %_llgo_2, label %_llgo_3
+
+_llgo_2:                                          ; preds = %_llgo_1
+  %11 = getelementptr inbounds i64, ptr %0, i64 %9
+  %12 = load i64, ptr %11, align 4
+  %13 = call i32 (ptr, ...) @printf(ptr @0, i64 %12)
+  br label %_llgo_1
+
+_llgo_3:                                          ; preds = %_llgo_1
+  ret void
+}
+
+declare void @qsort(ptr, i64, i64, ptr)
+
+declare void @"github.com/goplus/llgo/internal/runtime.init"()
+
+declare ptr @"github.com/goplus/llgo/internal/runtime.Alloc"(i64)
+
+declare i32 @"main.main$1"(ptr, ptr)
+
+declare i32 @printf(ptr, ...)