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[Bug rtl-optimization/20532] [4.0 Regression] Bad code for DImode left shifts by 31 and then 1
- From: "cvs-commit at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 30 Mar 2005 02:42:04 -0000
- Subject: [Bug rtl-optimization/20532] [4.0 Regression] Bad code for DImode left shifts by 31 and then 1
- References: <20050318134456.20532.macro@linux-mips.org>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Additional Comments From cvs-commit at gcc dot gnu dot org 2005-03-30 02:41 -------
Subject: Bug 20532
CVSROOT: /cvs/gcc
Module name: gcc
Branch: gcc-4_0-branch
Changes by: aoliva@gcc.gnu.org 2005-03-30 02:41:35
Modified files:
gcc : ChangeLog simplify-rtx.c
gcc/testsuite : ChangeLog
Added files:
gcc/testsuite/gcc.dg/torture: badshift.c
Log message:
gcc/ChangeLog:
PR rtl-optimization/20532
* simplify-rtx.c (simplify_binary_operation): Protect from
overflow when adding coefficients for PLUS or MINUS. Handle
CONST_DOUBLE exact power of two as multiplier.
gcc/testsuite/ChangeLog:
PR rtl-optimization/20532
* gcc.dg/torture/badshift.c: New.
Patches:
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/ChangeLog.diff?cvsroot=gcc&only_with_tag=gcc-4_0-branch&r1=2.7592.2.91&r2=2.7592.2.92
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/simplify-rtx.c.diff?cvsroot=gcc&only_with_tag=gcc-4_0-branch&r1=1.230.2.1&r2=1.230.2.2
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/ChangeLog.diff?cvsroot=gcc&only_with_tag=gcc-4_0-branch&r1=1.5084.2.76&r2=1.5084.2.77
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/gcc.dg/torture/badshift.c.diff?cvsroot=gcc&only_with_tag=gcc-4_0-branch&r1=NONE&r2=1.1.2.1
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20532