Re: [PATCH, i386]: Fix PR 65871, bzhi builtin/intrinsic wrongly assumes bzhi instruction doesn't set the ZF flag

[Jakub Jelinek]

On Wed, Apr 29, 2015 at 09:02:16PM +0200, Uros Bizjak wrote:
> Hello!
> 
> Attached patch implements a CCZ-only setting pattern for a couple of
> BMI[,2] intrinsics.

What about the case when the result is used, but also tested for zero or
non-zero?  Like e.g.
int bar (void);
int foo (unsigned int x, unsigned int y)
{
  int v = __builtin_ia32_bextr_u32 (x, y);
  if (v)
    return v;
  return bar ();
}

        Jakub