gcc/testsuite/gcc.dg/20000720-1.c

   1 /* { dg-do compile { target i?86-*-* x86_64-*-* } } */
   2 /* { dg-require-effective-target ilp32 } */
   3 /* { dg-options "-mpreferred-stack-boundary=2 -march=i586 -O2 -fomit-frame-pointer" } */
   4
   5 extern void *foo(void *a, const void *b, unsigned c);
   6
   7 extern inline void *
   8 bar(void *a, const void *b, unsigned c)
   9 {
  10   int d0, d1, d2;
  11   __asm__ __volatile__(
  12     "" :
  13     "=&c" (d0), "=&D" (d1), "=&S" (d2) :
  14     "0" (c/4), "q" (c), "1" (a), "2" (b) :
  15     "memory");
  16   return a;
  17 }
  18
  19 typedef struct {
  20   unsigned char a;
  21   unsigned b : 2;
  22   unsigned c : 4;
  23   unsigned d : 2;
  24 } *baz;
  25
  26 static int
  27 dead(unsigned short *v, char *w, unsigned char *x, int y, int z)
  28 {
  29   int i = 0;
  30   unsigned short j = *v;
  31
  32   while (y > 0) {
  33     ((baz)x)->a = j;
  34     ((baz)x)->b = 0;
  35     ((baz)x)->c = 0;
  36     ((baz)x)->d = 0;
  37     __builtin_constant_p(i) ? foo(x, w, i) : bar(x, w, i);
  38   }
  39   return z - y;
  40 }