gcc/testsuite/gcc.target/i386/pad-9.c

/* { dg-do compile { target { ! ia32 } } } */
/* { dg-skip-if "" { *-*-* } { "-march=*" } { "-march=atom" } } */
/* { dg-options "-O2 -fomit-frame-pointer -march=atom" } */
/* { dg-final { scan-assembler-times "nop" 4 { target { ! x86_64-*-mingw* } } } } */
/* { dg-final { scan-assembler-times "nop" 2 { target x86_64-*-mingw* } } } */
/* { dg-final { scan-assembler-not "rep" } } */

extern void bar (void);

void
foo (int x)
{
  if (x)
    bar ();
}