[PATCH][BZ #14412] Define __sincos_finite as a fast version of sincos

[Joseph S. Myers]

On Mon, 29 Apr 2013, Siddhesh Poyarekar wrote:

> This patch brings back the assembly implementation of sincos (with
> some changes) to give a fast alternative to the default sincos
> implementation.  This is defined as __sincos_finite and is used if the
> implementing program is compiled with the -ffinite-math-only gcc flag.

The changes don't seem to include accurate range reduction.  Without that, 
I think this is inappropriate, as it will result in wildly inaccurate 
results for large but finite inputs.

(I've stated before that all libm tests with finite inputs and outputs 
should be run with -ffinite-math-only - and I consider that they should 
pass when they pass without that option, and should not need different 
ulps for the different ways of running them.)

-- 
Joseph S. Myers
joseph@codesourcery.com