gcc/testsuite/gcc.target/i386/pr50038.c

   1 /* PR target/50038 */
   2 /* { dg-do compile } */
   3 /* { dg-options "-O2" } */
   4
   5 void
   6 test (int len, unsigned char *in, unsigned char *out)
   7 {
   8   int i;
   9   unsigned char xr, xg;
  10   unsigned char xy=0;
  11   for (i = 0; i < len; i++)
  12     {
  13       xr = *in++;
  14       xg = *in++;
  15       xy = (unsigned char) ((19595 * xr + 38470 * xg) >> 16);
  16
  17       *out++ = xy;
  18     }
  19 }
  20
  21 /* { dg-final { scan-assembler-times "movzbl" 2 } } */