gcc-4.9/gcc/testsuite/gcc.dg/pr46212.c


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/* PR rtl-optimization/46212 */
/* { dg-do compile } */
/* { dg-options "-O3 -funroll-loops" } */
/* { dg-options "-O3 -funroll-loops -march=i386" { target { { i686-*-* x86_64-*-* } && ia32 } } } */
/* { dg-require-effective-target int32plus } */

static inline unsigned
foo (void *x)
{
  unsigned y = *(volatile unsigned *) (x);
  return (y >> 24) | ((y >> 8) & 0xff00) | ((y & 0xff00) << 8) | (y << 24);
}

void
bar (void *x, void *y, int z)
{
  unsigned c;
  while (z--)
    {
      c = foo (y);
      *(unsigned *) x = (c & 0xf80000) >> 9 | (c & 0xf800) >> 6
			| (c & 0xf8) >> 3 | (c & 0x80000000) >> 16;
    }
}