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[Bug math/15367] Let gcc use __builtin_isinf
- From: "cvs-commit at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Fri, 18 Sep 2015 15:40:18 +0000
- Subject: [Bug math/15367] Let gcc use __builtin_isinf
- Auto-submitted: auto-generated
- References: <bug-15367-131 at http dot sourceware dot org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=15367
--- Comment #12 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
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- Log -----------------------------------------------------------------
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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