gcc/testsuite/gcc.dg/pr46212.c

   1 /* PR rtl-optimization/46212 */
   2 /* { dg-do compile } */
   3 /* { dg-options "-O3 -funroll-loops" } */
   4 /* { dg-options "-O3 -funroll-loops -march=i386" { target { { i?86-*-* x86_64-*-* } && ia32 } } } */
   5 /* { dg-require-effective-target int32plus } */
   6
   7 static inline unsigned
   8 foo (void *x)
   9 {
  10   unsigned y = *(volatile unsigned *) (x);
  11   return (y >> 24) | ((y >> 8) & 0xff00) | ((y & 0xff00) << 8) | (y << 24);
  12 }
  13
  14 void
  15 bar (void *x, void *y, int z)
  16 {
  17   unsigned c;
  18   while (z--)
  19     {
  20       c = foo (y);
  21       *(unsigned *) x = (c & 0xf80000) >> 9 | (c & 0xf800) >> 6
  22                         | (c & 0xf8) >> 3 | (c & 0x80000000) >> 16;
  23     }
  24 }