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From: "cvs-commit at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug math/18825] pow missing underflows
Date: Fri, 25 Sep 2015 22:30:00 -0000 [thread overview]
Message-ID: <bug-18825-131-JCqM5HKpvQ@http.sourceware.org/bugzilla/> (raw)
In-Reply-To: <bug-18825-131@http.sourceware.org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=18825
--- Comment #2 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
This is an automated email from the git hooks/post-receive script. It was
generated because a ref change was pushed to the repository containing
the project "GNU C Library master sources".
The branch, master has been updated
via 6ace39382120dd0668b2168591611f71b04ac8f3 (commit)
from 5a9af6376d43b58c6545feb86002812a57956654 (commit)
Those revisions listed above that are new to this repository have
not appeared on any other notification email; so we list those
revisions in full, below.
- Log -----------------------------------------------------------------
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=6ace39382120dd0668b2168591611f71b04ac8f3
commit 6ace39382120dd0668b2168591611f71b04ac8f3
Author: Joseph Myers <joseph@codesourcery.com>
Date: Fri Sep 25 22:29:10 2015 +0000
Fix pow missing underflows (bug 18825).
Similar to various other bugs in this area, pow functions can fail to
raise the underflow exception when the result is tiny and inexact but
one or more low bits of the intermediate result that is scaled down
(or, in the i386 case, converted from a wider evaluation format) are
zero. This patch forces the exception in a similar way to previous
fixes, thereby concluding the fixes for known bugs with missing
underflow exceptions currently filed in Bugzilla.
Tested for x86_64, x86, mips64 and powerpc.
[BZ #18825]
* sysdeps/i386/fpu/i386-math-asm.h (FLT_NARROW_EVAL_UFLOW_NONNAN):
New macro.
(DBL_NARROW_EVAL_UFLOW_NONNAN): Likewise.
(LDBL_CHECK_FORCE_UFLOW_NONNAN): Likewise.
* sysdeps/i386/fpu/e_pow.S: Use DEFINE_DBL_MIN.
(__ieee754_pow): Use DBL_NARROW_EVAL_UFLOW_NONNAN instead of
DBL_NARROW_EVAL, reloading the PIC register as needed.
* sysdeps/i386/fpu/e_powf.S: Use DEFINE_FLT_MIN.
(__ieee754_powf): Use FLT_NARROW_EVAL_UFLOW_NONNAN instead of
FLT_NARROW_EVAL. Use separate return path for case when first
argument is NaN.
* sysdeps/i386/fpu/e_powl.S: Include <i386-math-asm.h>. Use
DEFINE_LDBL_MIN.
(__ieee754_powl): Use LDBL_CHECK_FORCE_UFLOW_NONNAN, reloading the
PIC register.
* sysdeps/ieee754/dbl-64/e_pow.c (__ieee754_pow): Use
math_check_force_underflow_nonneg.
* sysdeps/ieee754/flt-32/e_powf.c (__ieee754_powf): Force
underflow for subnormal result.
* sysdeps/ieee754/ldbl-128/e_powl.c (__ieee754_powl): Likewise.
* sysdeps/ieee754/ldbl-128ibm/e_powl.c (__ieee754_powl): Use
math_check_force_underflow_nonneg.
* sysdeps/x86/fpu/powl_helper.c (__powl_helper): Use
math_check_force_underflow.
* sysdeps/x86_64/fpu/x86_64-math-asm.h
(LDBL_CHECK_FORCE_UFLOW_NONNAN): New macro.
* sysdeps/x86_64/fpu/e_powl.S: Include <x86_64-math-asm.h>. Use
DEFINE_LDBL_MIN.
(__ieee754_powl): Use LDBL_CHECK_FORCE_UFLOW_NONNAN.
* math/auto-libm-test-in: Add more tests of pow.
* math/auto-libm-test-out: Regenerated.
-----------------------------------------------------------------------
Summary of changes:
ChangeLog | 35 +
NEWS | 6 +-
math/auto-libm-test-in | 145 ++
math/auto-libm-test-out | 3644 ++++++++++++++++++++++++++++++++++
sysdeps/i386/fpu/e_pow.S | 8 +-
sysdeps/i386/fpu/e_powf.S | 13 +-
sysdeps/i386/fpu/e_powl.S | 6 +
sysdeps/i386/fpu/i386-math-asm.h | 46 +
sysdeps/ieee754/dbl-64/e_pow.c | 2 +
sysdeps/ieee754/flt-32/e_powf.c | 7 +-
sysdeps/ieee754/ldbl-128/e_powl.c | 6 +-
sysdeps/ieee754/ldbl-128ibm/e_powl.c | 1 +
sysdeps/x86/fpu/powl_helper.c | 1 +
sysdeps/x86_64/fpu/e_powl.S | 3 +
sysdeps/x86_64/fpu/x86_64-math-asm.h | 13 +
15 files changed, 3926 insertions(+), 10 deletions(-)
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next prev parent reply other threads:[~2015-09-25 22:30 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-08-13 23:10 [Bug math/18825] New: " jsm28 at gcc dot gnu.org
2015-08-13 23:12 ` [Bug math/18825] " jsm28 at gcc dot gnu.org
2015-09-25 22:30 ` cvs-commit at gcc dot gnu.org [this message]
2015-09-25 22:31 ` jsm28 at gcc dot gnu.org
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