[patch, mips] Add new inline functions to mips math_private.h

[Joseph S. Myers]

On Tue, 25 Feb 2014, Steve Ellcey wrote:

> This is a patch to the MIPS math_private.h file to define HAVE_RM_CTX and
> implement the ctx macros.  I also defined a few other macros and inline
> functions that I skipped the first time.
> 
> Testing did not show any correctness regressions and I got some performance
> improvements plus a few small regressions.  I included a before and after
> bench.out file along with the patch.  Some tests slowed down but log2() was
> the only one that slowed down more then 1%.  5 tests improved by about 2.5%,
> cosh improved by 11.55%, sinh by 7.8%, and sincos() by 10%.  I think the
> sinh/cosh improvements being larger are due to simple/small inputs in the
> test cases.
> 
> I am not completely sure about the difference between the libc_feholdsetround
> functions and the libc_feholdexcept_setround functions (likewise
> libc_feupdateenv and libc_feresetround), but I believe my changes are safe,
> even if they may not be optimal.  If anyone has any comments on these in
> particular I would like to hear them.
> 
> OK to checkin?

OK.

-- 
Joseph S. Myers
joseph@codesourcery.com