gcc/testsuite/gcc.dg/pr53942.c

   1 /* PR rtl-optimization/53942 */
   2 /* { dg-do compile } */
   3 /* { dg-options "-O2" } */
   4 /* { dg-additional-options "-mtune=pentium2" { target { { i?86-*-* x86_64-*-* } && ia32 } } } */
   5
   6 struct S
   7 {
   8   unsigned short w[3];
   9   unsigned int x, y;
  10 };
  11
  12 struct S *baz (void);
  13
  14 __attribute__ ((noinline))
  15 static unsigned char
  16 foo (struct S *x, unsigned char y)
  17 {
  18   unsigned char c = 0;
  19   unsigned char v = x->w[0];
  20   c |= v;
  21   v = ((x->w[1]) & (1 << y)) ? 1 : 0;
  22   c |= v << 1;
  23   v = ((x->w[2]) & 0xff) & (1 << y);
  24   c |= v << 2;
  25   return c;
  26 }
  27
  28 void
  29 bar (void)
  30 {
  31   struct S *s = baz ();
  32   s->x = foo (s, 6);
  33   s->y = foo (s, 7);
  34 }