From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 29197 invoked by alias); 9 Feb 2009 13:38:03 -0000 Received: (qmail 29070 invoked by uid 48); 9 Feb 2009 13:37:51 -0000 Date: Mon, 09 Feb 2009 13:38:00 -0000 Message-ID: <20090209133751.29069.qmail@sourceware.org> X-Bugzilla-Reason: CC References: Subject: [Bug target/38824] [4.4 Regression] performance regression of sse code from 4.2/4.3 In-Reply-To: Reply-To: gcc-bugzilla@gcc.gnu.org To: gcc-bugs@gcc.gnu.org From: "bonzini at 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: 2009-02/txt/msg00766.txt.bz2 ------- Comment #19 from bonzini at gnu dot org 2009-02-09 13:37 ------- Also, Dwarak, here the change is not from addps (%rax, %rsi), %xmm1 to movps (%rax, %rsi), %xmm0 addps %xmm0, %xmm1 but rather from movps %xmm0, %xmm1 addps (%rax, %rsi), %xmm1 to the second snippet above. Does this pessimize on AMD too? I don't think so, it should be 1 uop less, but I'd rather have confirmation. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38824