Remove more old-compilers parts of sysdeps/x86/fpu/bits/mathinline.h.

This patch removes further parts of sysdeps/x86/fpu/bits/mathinline.h
that are only of value for optimization with older compiler versions,
in accordance with general principles of preferring the let the
compiler deal with such inlining through built-in functions.

In general, GCC supports inlining all these functions as of version
4.3 or earlier.  However, some inlines in GCC may have had excessively
restrictive conditions in past GCC versions (e.g. requiring
-ffast-math when the inline is valid under broader conditions).  (In
particular, GCC had, before GCC 7, unnecessarily restrictive
conditions on when it could apply floor and ceil inlines corresponding
to the ones removed here.  The same was true for rint, but
bits/mathinline.h *also* was excessively restrictive there.)

The removed sincos inlines are for __sincos etc. functions (not a
public interface and not currently used in this header either; not in
a part of the header ever used for building glibc itself).  Likewise,
the atan2 inlines included one for __atan2l, also not a public
interface and not used for building glibc itself (calls inside glibc
generally use __ieee754_atan2l, for which there is a separate
__LIBC_INTERNAL_MATH_INLINES case in this header).

Tested for x86_64 and x86.

	* sysdeps/x86/fpu/bits/mathinline.h [__FAST_MATH__]
	(__sincos_code): Remove define and undefine.
	[__FAST_MATH__] (__sincos): Remove inline function.
	[__FAST_MATH__] (__sincosf): Remove inline function.
	[__FAST_MATH__] (__sincosl): Remove inline function.
	(__atan2l): Remove inline functions.
	[!__GNUC_PREREQ (3, 4)] (__atan2_code): Remove macro.
	[!__GNUC_PREREQ (3, 4) && __FAST_MATH__] (atan2): Remove inline
	function.
	(floor): Remove inline function.
	(ceil): Likewise.
	[__FAST_MATH__] (__ldexp_code): Remove macro.
	[__FAST_MATH__] (ldexp): Remove inline function.
	[__FAST_MATH__ && __USE_ISOC99] (ldexpf): Likewise.
	[__FAST_MATH__ && __USE_ISOC99] (ldexpl): Likewise.
	[__FAST_MATH__ && __USE_ISOC99] (rint): Likewise.
	[__USE_ISOC99] (__lrint_code): Remove macro.
	[__USE_ISOC99] (__llrint_code): Likewise.
	[__USE_ISOC99] (lrintf): Remove inline function.
	[__USE_ISOC99] (lrint): Likewise.
	[__USE_ISOC99] (lrintl): Likewise.
	[__USE_ISOC99] (llrint): Likewise.
	[__USE_ISOC99] (llrintf): Likewise.
	[__USE_ISOC99] (llrintl): Likewise.

1 files changed, 27 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index ca38d1dcd7..6c8c880243 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,30 @@
+2018-03-15  Joseph Myers  <joseph@codesourcery.com>
+
+	* sysdeps/x86/fpu/bits/mathinline.h [__FAST_MATH__]
+	(__sincos_code): Remove define and undefine.
+	[__FAST_MATH__] (__sincos): Remove inline function.
+	[__FAST_MATH__] (__sincosf): Remove inline function.
+	[__FAST_MATH__] (__sincosl): Remove inline function.
+	(__atan2l): Remove inline functions.
+	[!__GNUC_PREREQ (3, 4)] (__atan2_code): Remove macro.
+	[!__GNUC_PREREQ (3, 4) && __FAST_MATH__] (atan2): Remove inline
+	function.
+	(floor): Remove inline function.
+	(ceil): Likewise.
+	[__FAST_MATH__] (__ldexp_code): Remove macro.
+	[__FAST_MATH__] (ldexp): Remove inline function.
+	[__FAST_MATH__ && __USE_ISOC99] (ldexpf): Likewise.
+	[__FAST_MATH__ && __USE_ISOC99] (ldexpl): Likewise.
+	[__FAST_MATH__ && __USE_ISOC99] (rint): Likewise.
+	[__USE_ISOC99] (__lrint_code): Remove macro.
+	[__USE_ISOC99] (__llrint_code): Likewise.
+	[__USE_ISOC99] (lrintf): Remove inline function.
+	[__USE_ISOC99] (lrint): Likewise.
+	[__USE_ISOC99] (lrintl): Likewise.
+	[__USE_ISOC99] (llrint): Likewise.
+	[__USE_ISOC99] (llrintf): Likewise.
+	[__USE_ISOC99] (llrintl): Likewise.
+
 2018-03-15  Wilco Dijkstra  <wdijkstr@arm.com>
 
 	* benchtests/Makefile: Define _ISOMAC.