[Bug math/15367] Let gcc use __builtin_isinf

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https://sourceware.org/bugzilla/show_bug.cgi?id=15367

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=8df4e219e43a4a257d0759b54fef8c488e2f282e

commit 8df4e219e43a4a257d0759b54fef8c488e2f282e
Author: Wilco Dijkstra <wdijkstr@arm.com>
Date:   Fri Sep 18 16:30:43 2015 +0100

    Add inlining of the C99 math functions
isinf/isnan/signbit/isfinite/isnormal/fpclassify using GCC
    built-ins when available. Since going through the PLT is expensive for
these small functions,
    inlining results in major speedups (about 7x on Cortex-A57 for isinf). The
GCC built-ins are not
    correct if signalling NaN support is required, and thus are turned off in
that case (see GCC bug
    66462). The test-snan.c tests sNaNs and so must be explicitly built with
-fsignaling-nans.

    2015-09-18  Wilco Dijkstra  <wdijkstr@arm.com>

            [BZ #15367]
            [BZ #17441]

            * math/Makefile: Build test-snan.c with -fsignaling-nans.
            * math/math.h (fpclassify): Use __builtin_fpclassify when
            available.  (signbit): Use __builtin_signbit(f/l).
            (isfinite): Use__builtin_isfinite.  (isnormal): Use
            __builtin_isnormal.  (isnan): Use __builtin_isnan.
            (isinf): Use __builtin_isinf_sign.

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog     |   12 ++++++++++++
 NEWS          |   15 ++++++++-------
 math/Makefile |    3 ++-
 math/math.h   |   42 ++++++++++++++++++++++++++++++++++--------
 4 files changed, 56 insertions(+), 16 deletions(-)

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