clang/test/CodeGen/pr41027.c

   1 // REQUIRES: x86-registered-target
   2 // RUN: %clang_cc1 -triple x86_64-unknown-unknown -S -O2 -o - %s | FileCheck %s
   3
   4 // CHECK-LABEL: f:
   5 // CHECK:         movl $1, %eax
   6 // CHECK-NEXT:    #APP
   7 // CHECK-NEXT:    outl %eax, $1
   8 // CHECK-NEXT:    #NO_APP
   9
  10 static inline void pr41027(unsigned a, unsigned b) {
  11   if (__builtin_constant_p(a)) {
  12     __asm__ volatile("outl %0,%w1" : : "a"(b), "n"(a));
  13   } else {
  14     __asm__ volatile("outl %0,%w1" : : "a"(b), "d"(a));
  15   }
  16 }
  17
  18 void f(unsigned port) {
  19   pr41027(1, 1);
  20 }