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

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