From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 16830 invoked by alias); 10 Mar 2010 01:57:29 -0000 Received: (qmail 16190 invoked by uid 48); 10 Mar 2010 01:57:14 -0000 Date: Wed, 10 Mar 2010 01:57:00 -0000 Message-ID: <20100310015714.16189.qmail@sourceware.org> X-Bugzilla-Reason: CC References: Subject: [Bug middle-end/40979] induct benchmark 60% slower when compiled with -fgraphite-identity In-Reply-To: Reply-To: gcc-bugzilla@gcc.gnu.org To: gcc-bugs@gcc.gnu.org From: "howarth at nitro dot med dot uc dot edu" 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: 2010-03/txt/msg00914.txt.bz2 ------- Comment #6 from howarth at nitro dot med dot uc dot edu 2010-03-10 01:57 ------- The code being degraded by -fgraphite-identity (when using -ffast-math -funroll-loops -O3) is in the mqr_m and mqc_m modules. The exact distribution of performance loss in execution time for the induct benchmark is... no use of -fgraphite-identity 12.695 sec -fgraphite-identity for all 20.177 sec -fgraphite-identity for all but mqc_m 14.293 sec -fgraphite-identity for all but mqr_m 18.598 sec -fgraphite-identity for all but mqc_m and mqr_m 12.677 sec as benchmarked on x86_64-apple-darwin10. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40979