diff --git a/_demo/asmcall/asmcall.go b/_demo/asmcall/asmcall.go
new file mode 100644
index 00000000..324677a6
--- /dev/null
+++ b/_demo/asmcall/asmcall.go
@@ -0,0 +1,18 @@
+package main
+
+import (
+	"fmt"
+	"time"
+)
+
+//llgo:link asm llgo.asm
+func asm(instruction string) {}
+
+func main() {
+	start := time.Now()
+	for i := 0; i < 100000; i++ {
+		asm("nop")
+	}
+	duration := time.Since(start)
+	fmt.Println("Duration:", duration)
+}
diff --git a/cl/_testrt/asm/in.go b/cl/_testrt/asm/in.go
new file mode 100644
index 00000000..74d9a68c
--- /dev/null
+++ b/cl/_testrt/asm/in.go
@@ -0,0 +1,10 @@
+package main
+
+import _ "unsafe"
+
+//go:linkname asm llgo.asm
+func asm(instruction string)
+
+func main() {
+	asm("nop")
+}
diff --git a/cl/_testrt/asm/out.ll b/cl/_testrt/asm/out.ll
new file mode 100644
index 00000000..164617e3
--- /dev/null
+++ b/cl/_testrt/asm/out.ll
@@ -0,0 +1,23 @@
+; ModuleID = 'github.com/goplus/llgo/cl/_testrt/asm'
+source_filename = "github.com/goplus/llgo/cl/_testrt/asm"
+
+@"github.com/goplus/llgo/cl/_testrt/asm.init$guard" = global i1 false, align 1
+
+define void @"github.com/goplus/llgo/cl/_testrt/asm.init"() {
+_llgo_0:
+  %0 = load i1, ptr @"github.com/goplus/llgo/cl/_testrt/asm.init$guard", align 1
+  br i1 %0, label %_llgo_2, label %_llgo_1
+
+_llgo_1:                                          ; preds = %_llgo_0
+  store i1 true, ptr @"github.com/goplus/llgo/cl/_testrt/asm.init$guard", align 1
+  br label %_llgo_2
+
+_llgo_2:                                          ; preds = %_llgo_1, %_llgo_0
+  ret void
+}
+
+define void @"github.com/goplus/llgo/cl/_testrt/asm.main"() {
+_llgo_0:
+  call void asm sideeffect "nop", ""()
+  ret void
+}
diff --git a/cl/import.go b/cl/import.go
index b70d0046..91561e6b 100644
--- a/cl/import.go
+++ b/cl/import.go
@@ -506,6 +506,9 @@ const (
 	llgoCgoCheckPointer = llgoCgoBase + 0x6
 	llgoCgoCgocall      = llgoCgoBase + 0x7
 
+	llgoAsmBase = llgoInstrBase + 0x40
+	llgoAsm     = llgoAsmBase + 0x0
+
 	llgoAtomicOpLast = llgoAtomicOpBase + int(llssa.OpUMin)
 )
 
diff --git a/cl/instr.go b/cl/instr.go
index 2865fb2c..e988bc01 100644
--- a/cl/instr.go
+++ b/cl/instr.go
@@ -66,6 +66,17 @@ func cstr(b llssa.Builder, args []ssa.Value) (ret llssa.Expr) {
 	panic("cstr(<string-literal>): invalid arguments")
 }
 
+// func asm(string)
+func asm(b llssa.Builder, args []ssa.Value) (ret llssa.Expr) {
+	if len(args) == 1 {
+		if sv, ok := constStr(args[0]); ok {
+			b.InlineAsm(sv)
+			return llssa.Expr{Type: b.Prog.Void()}
+		}
+	}
+	panic("asm(<string-literal>): invalid arguments")
+}
+
 // -----------------------------------------------------------------------------
 
 // func _Cfunc_CString(s string) *int8
@@ -329,6 +340,8 @@ var llgoInstrs = map[string]int{
 	"_Cfunc__CMalloc":      llgoCgoCMalloc,
 	"_cgoCheckPointer":     llgoCgoCheckPointer,
 	"_cgo_runtime_cgocall": llgoCgoCgocall,
+
+	"asm": llgoAsm,
 }
 
 // funcOf returns a function by name and set ftype = goFunc, cFunc, etc.
@@ -456,6 +469,8 @@ func (p *context) call(b llssa.Builder, act llssa.DoAction, call *ssa.CallCommon
 			ret = pystr(b, args)
 		case llgoCstr:
 			ret = cstr(b, args)
+		case llgoAsm:
+			ret = asm(b, args)
 		case llgoCgoCString:
 			ret = p.cgoCString(b, args)
 		case llgoCgoCBytes:
diff --git a/ssa/expr.go b/ssa/expr.go
index ffebb888..6f98cb38 100644
--- a/ssa/expr.go
+++ b/ssa/expr.go
@@ -275,6 +275,17 @@ func (b Builder) CBytes(v Expr) Expr {
 	return b.Call(fn, v)
 }
 
+// InlineAsm generates inline assembly instruction
+func (b Builder) InlineAsm(instruction string) {
+	if debugInstr {
+		log.Printf("InlineAsm %s\n", instruction)
+	}
+
+	typ := llvm.FunctionType(b.Prog.tyVoid(), nil, false)
+	asm := llvm.InlineAsm(typ, instruction, "", true, false, llvm.InlineAsmDialectATT, false)
+	b.impl.CreateCall(typ, asm, nil, "")
+}
+
 // GoString returns a Go string
 func (b Builder) GoString(v Expr) Expr {
 	fn := b.Pkg.rtFunc("GoString")