[Bug rtl-optimization/20532] [4.0 Regression] Bad code for DImode left shifts by 31 and then 1

["cvs-commit at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.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



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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20532