From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 25027 invoked by alias); 13 Sep 2010 21:00:44 -0000 Received: (qmail 24990 invoked by alias); 13 Sep 2010 21:00:27 -0000 Date: Mon, 13 Sep 2010 21:00:00 -0000 Message-ID: <20100913210027.24989.qmail@sourceware.org> X-Bugzilla-Reason: CC References: Subject: [Bug rtl-optimization/45617] optimize bit shift+compare at RTL level In-Reply-To: Reply-To: gcc-bugzilla@gcc.gnu.org To: gcc-bugs@gcc.gnu.org From: "jakub at gcc dot gnu dot org" Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-bugs-owner@gcc.gnu.org X-SW-Source: 2010-09/txt/msg01580.txt.bz2 ------- Comment #2 from jakub at gcc dot gnu dot org 2010-09-13 21:00 ------- Subject: Bug 45617 Author: jakub Date: Mon Sep 13 21:00:03 2010 New Revision: 164257 URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=164257 Log: PR rtl-optimization/45617 * combine.c (simplify_comparison): Optimize (X >> N) {>,>=,<,<=} C even if low N bits of X aren't known to be zero. * gcc.target/i386/pr45617.c: New test. Added: trunk/gcc/testsuite/gcc.target/i386/pr45617.c Modified: trunk/gcc/ChangeLog trunk/gcc/combine.c trunk/gcc/testsuite/ChangeLog -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45617