From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 103478 invoked by alias); 25 Sep 2015 22:30:32 -0000 Mailing-List: contact glibc-bugs-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Post: List-Help: , Sender: glibc-bugs-owner@sourceware.org Received: (qmail 103167 invoked by uid 55); 25 Sep 2015 22:30:27 -0000 From: "cvs-commit at gcc dot gnu.org" To: glibc-bugs@sourceware.org Subject: [Bug math/18825] pow missing underflows Date: Fri, 25 Sep 2015 22:30:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: glibc X-Bugzilla-Component: math X-Bugzilla-Version: 2.22 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: cvs-commit at gcc dot gnu.org X-Bugzilla-Status: NEW X-Bugzilla-Resolution: X-Bugzilla-Priority: P2 X-Bugzilla-Assigned-To: unassigned at sourceware dot org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Flags: security- X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-Bugzilla-URL: http://sourceware.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-SW-Source: 2015-09/txt/msg00328.txt.bz2 https://sourceware.org/bugzilla/show_bug.cgi?id=18825 --- Comment #2 from 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 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 . 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 . 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(-) -- You are receiving this mail because: You are on the CC list for the bug.