src/llvm/tools/clang/test/CodeGen/asm-reg-var-local.c

   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 }