gcc/testsuite/gcc.dg/asm-b.c

   1 /* { dg-do run  { target powerpc*-*-* i?86-*-* x86_64-*-* } } */
   2 /* { dg-options "-O1" } */
   3 /* Test to make sure that inline-asm causes the tree optimizers to get the
   4    V_MAY_DEFs and clobber memory.  */
   5 /* Test from Jakub Jelinek, modified by Andrew Pinski to work on all powerpc targets.  */
   6 extern void abort (void);
   7
   8 unsigned short v = 0x0300;
   9
  10 void
  11 foo (unsigned short *p)
  12 {
  13   *p = v;
  14 }
  15
  16 int
  17 bar (void)
  18 {
  19   unsigned short x;
  20   volatile unsigned short *z;
  21   foo (&x);
  22   const unsigned int y = x;
  23   z = &x;
  24 #if defined (__powerpc__) || defined (__PPC__) || defined (__ppc__) || defined (_POWER) || defined (__ppc64__) || defined (__ppc)
  25   __asm __volatile ("sthbrx %1,0,%2" : "=m" (*z) : "r" (y), "r" (z));
  26 #elif defined __i386__ || defined __x86_64__
  27   __asm __volatile ("movb %b1,1(%2)\n\tmovb %h1,(%2)"
  28                     : "=m" (*z) : "Q" (y), "R" (z));
  29 #endif
  30   return (x & 1) == 0;
  31 }
  32
  33 int
  34 main (void)
  35 {
  36   if (bar ())
  37     abort ();
  38   return 0;
  39 }