[PATCH]: PR29335 use MPFR for builtin sincos

[Roger Sayle]

On Wed, 1 Nov 2006, Kaveh R. GHAZI wrote:
> Is there any other testcase you would like me to try or can I install
> the patch?

The patch is OK for mainline.  It would also be nice if you could
turn the sincos(zero,&s,&c) test case into something suitable for
GCC's dejagnu testsuite and check that in.  And just for good luck
perhaps something like:

void foo(double x)
{
  double s, c;

  if (x == 0.0)
  {
    sincos(x,&s,&c);
    /* Check s and c.  */
  }
}

However these new test cases can be committed as a follow-up patch.
We've no reason to believe the tree-ssa passes can't handle the new
non-gimple (*sp=X, *cp=Y) idiom that sincos folding can now produce,
but it does no harm as to make sure things don't break in future.

[I'll admit that I'm a bit curious as to which pass actually performs
the simplification you tested for, but it'll be easy enough for me
to investigate this for myself once your patch goes in. :-)]

Thanks again, and to Richard for looking things over.

Roger
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