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
4int 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