From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 24904 invoked by alias); 15 May 2008 09:22:37 -0000 Received: (qmail 24834 invoked by uid 48); 15 May 2008 09:21:53 -0000 Date: Thu, 15 May 2008 09:22:00 -0000 Message-ID: <20080515092153.24833.qmail@sourceware.org> X-Bugzilla-Reason: CC References: Subject: [Bug target/36241] Executable compiled with -m64 almost three times faster than the one compiled with -m32 on Core2Duo In-Reply-To: Reply-To: gcc-bugzilla@gcc.gnu.org To: gcc-bugs@gcc.gnu.org From: "ubizjak at gmail dot com" 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: 2008-05/txt/msg01157.txt.bz2 ------- Comment #2 from ubizjak at gmail dot com 2008-05-15 09:21 ------- This regression is due to store forwarding penalty: ... movl %esi, -408(%ebp) movl %edi, -404(%ebp) fldl -408(%ebp) ... -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36241