C++程序  |  30行  |  977 B

// RUN: %clang_cc1 -triple i386-unknown-unknown -fasm-blocks -fsyntax-only -verify %s -DCHECK_ASM_GOTO
// RUN: %clang_cc1 -triple i386-unknown-unknown -fasm-blocks -O0 -emit-llvm -S %s -o - | FileCheck %s
// REQUIRES: x86-registered-target

void f() {
  __asm mov eax, ebx
  __asm mov ebx, ecx
  __asm__("movl %ecx, %edx");
  // CHECK: movl    %ebx, %eax
  // CHECK: movl    %ecx, %ebx
  // CHECK: movl    %ecx, %edx

  __asm mov eax, ebx
  __asm volatile ("movl %ecx, %edx");
  // CHECK: movl    %ebx, %eax
  // CHECK: movl    %ecx, %edx

  __asm mov eax, ebx
  __asm const ("movl %ecx, %edx"); // expected-warning {{ignored const qualifier on asm}} 
  // CHECK: movl    %ebx, %eax
  // CHECK: movl    %ecx, %edx

#ifdef CHECK_ASM_GOTO
  __asm volatile goto ("movl %ecx, %edx"); // expected-error {{'asm goto' constructs are not supported yet}}

  __asm mov eax, ebx
  __asm goto ("movl %ecx, %edx"); // expected-error {{'asm goto' constructs are not supported yet}}
#endif
}