Re: [PATCH, i386]: Use missing gcc math builtins

[Ulrich Drepper <drepper at redhat dot com>]

Uros Bizjak wrote:
> This patch enhances libc's mathinline.h header to use some missing builtins
> (mainly rounding builtins) that were added during 4.0 timeframe.

But those builtins seem not to do much.  Just look at

#include <stdio.h>
int
main (void)
{
  double x = 4.5;
  printf ("%g\n", __builtin_exp2l (x));
  return 0;
}

The __builtin_exp2l call is not expanded inline, it's expanded to a call
to exp2l.  The definition in the libc header is complicated for a reason
and I don't think gcc wants to hardcode that.

I haven't looked at the remainder of the patch.  If there are some
builtins which are indeed useful and there is a difference in the code
generation, send a new patch.

-- 
â Ulrich Drepper â Red Hat, Inc. â 444 Castro St â Mountain View, CA â

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