[PATCH] Cleanup FAST_MATH misc functions from sysdeps/x86/fpu/bits/mathinline.h

[Joseph Myers]

On Thu, 26 Apr 2018, Uros Bizjak wrote:

> Hello!
> 
> Attached patch cleans up FAST_MATH misc functions from
> sysdeps/x86/fpu/bits/mathinline.h. The patch uses x87 __builtin

What we actually want to do is eliminate bits/mathinline.h completely 
(with libc-internal inlines moving to an internal header) (and then 
eliminate the separate inline function ulps and tests).  There may be a 
few remaining cases that would be useful for GCC to optimize with 
-ffast-math but that it doesn't currently have built-in optimizations for, 
however.

The header, while it exists, does need to work with old GCC versions as 
it's an installed header (optimizations might be disabled with old 
versions, however).

> Patch was tested on x86_64-linux-gnu, and the resulting mathinline.h
> was used to calculate test results of all changed functions.

Note this code isn't used for 64-bit anyway (it's all inside "#if !defined 
__SSE2_MATH__ && !defined __x86_64__").

-- 
Joseph S. Myers
joseph@codesourcery.com