gcc/testsuite/gcc.dg/pr31866.c

   1 /* PR tree-optimization/31866 */
   2 /* { dg-do compile { target alpha*-*-* cris-*-* crisv32-*-* i?86-*-* mmix-*-* powerpc*-*-* rs6000-*-* x86_64-*-* } } */
   3 /* { dg-options "-O2" } */
   4
   5 #if defined (__alpha__)
   6 # define REG "$1"
   7 #elif defined (__CRIS__)
   8 # define REG "r10"
   9 #elif defined (__i386__)
  10 # define REG "%eax"
  11 #elif defined (__MMIX__)
  12 # define REG "$8"
  13 #elif defined (__powerpc__) || defined (__PPC__) || defined (__ppc__) \
  14         || defined (__POWERPC__) || defined (PPC) || defined (_IBMR2)
  15 # define REG "6"
  16 #elif defined (__x86_64__)
  17 # define REG "rax"
  18 #endif
  19
  20 long int
  21 foo (void)
  22 {
  23   unsigned long int s;
  24   long int a = (long int) 0;
  25   register long int r asm (REG) = a;
  26   asm ("" : "=r" (s) : "0" (r));
  27   return s;
  28 }