1 // RUN: %clang_cc1 %s -triple x86_64-apple-darwin -emit-llvm -o - | FileCheck %s
2 // Exercise various use cases for local asm "register variables".
3 
4 int foo() {
5 // CHECK: [[A:%[a-zA-Z0-9]+]] = alloca i32
6 
7   register int a asm("rsi")=5;
8 // CHECK: store i32 5, i32* [[A]]
9 
10   asm volatile("; %0 This asm defines rsi" : "=r"(a));
11 // CHECK: [[Z:%[a-zA-Z0-9]+]] = call i32 asm sideeffect "; $0 This asm defines rsi", "={rsi},~{dirflag},~{fpsr},~{flags}"()
12 // CHECK: store i32 [[Z]], i32* [[A]]
13 
14   a = 42;
15 // CHECK:  store i32 42, i32* [[A]]
16 
17   asm volatile("; %0 This asm uses rsi" : : "r"(a));
18 // CHECK:  [[TMP:%[a-zA-Z0-9]+]] = load i32* [[A]]
19 // CHECK:  call void asm sideeffect "; $0 This asm uses rsi", "{rsi},~{dirflag},~{fpsr},~{flags}"(i32 [[TMP]])
20 
21   return a;
22 // CHECK:  [[TMP1:%[a-zA-Z0-9]+]] = load i32* [[A]]
23 // CHECK:  ret i32 [[TMP1]]
24 }
25