gcc/testsuite/gcc.target/i386/clobbers.c

   1 /* Test asm clobbers on x86. */
   2
   3 /* { dg-do run { target i?86-*-* x86_64-*-* } } */
   4 /* { dg-skip-if "" { ilp32 } { "-fpic" "-fPIC" } { "" } } */
   5
   6 extern void abort (void);
   7
   8 int main ()
   9 {
  10         int i;
  11         __asm__ ("movl $1,%0\n\txorl %%eax,%%eax" : "=r" (i) : : "eax");
  12         if (i != 1)
  13                 abort ();
  14         /* On darwin you can't call external functions from non-pic code,
  15            however, clobbering ebx isn't valid in pic code. Instead of
  16            disabling the whole test, just disable the ebx clobbering part.  */
  17 #if !(defined (__MACH__))
  18         __asm__ ("movl $1,%0\n\txorl %%ebx,%%ebx" : "=r" (i) : : "ebx");
  19         if (i != 1)
  20                 abort ();
  21 #endif
  22         __asm__ ("movl $1,%0\n\txorl %%ecx,%%ecx" : "=r" (i) : : "ecx");
  23         if (i != 1)
  24                 abort ();
  25         __asm__ ("movl $1,%0\n\txorl %%edx,%%edx" : "=r" (i) : : "edx");
  26         if (i != 1)
  27                 abort ();
  28         __asm__ ("movl $1,%0\n\txorl %%esi,%%esi" : "=r" (i) : : "esi");
  29         if (i != 1)
  30                 abort ();
  31         __asm__ ("movl $1,%0\n\txorl %%edi,%%edi" : "=r" (i) : : "edi");
  32         if (i != 1)
  33                 abort ();
  34         return 0;
  35 }