From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 12440 invoked by alias); 28 Jan 2005 17:22:36 -0000 Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Archive: List-Post: List-Help: Sender: gcc-bugs-owner@gcc.gnu.org Received: (qmail 12350 invoked by alias); 28 Jan 2005 17:22:24 -0000 Date: Fri, 28 Jan 2005 17:22:00 -0000 Message-ID: <20050128172224.12345.qmail@sourceware.org> From: "dberlin at dberlin dot org" To: gcc-bugs@gcc.gnu.org In-Reply-To: <20040326121739.14741.jv244@cam.ac.uk> References: <20040326121739.14741.jv244@cam.ac.uk> Reply-To: gcc-bugzilla@gcc.gnu.org Subject: [Bug tree-optimization/14741] missing transformations lead to poorly optimized code X-Bugzilla-Reason: CC X-SW-Source: 2005-01/txt/msg04202.txt.bz2 List-Id: ------- Additional Comments From dberlin at gcc dot gnu dot org 2005-01-28 17:22 ------- Subject: Re: missing transformations lead to poorly optimized code On Fri, 28 Jan 2005, jv244 at cam dot ac dot uk wrote: > > ------- Additional Comments From jv244 at cam dot ac dot uk 2005-01-28 16:31 ------- > >> You could try "gfortran -O3 -mtune=pentium4 -ffast-math -mfpmath=sse >> -ftree-loop-linear -ftree-vectorize yourcode.f90" and see if it helps. > > Unhappily, seems to make things slower: > > multgen/basic_mult> gfortran -O3 -mtune=pentium4 -ffast-math -mfpmath=sse > -ftree-loop-linear -ftree-vectorize mult.f90 > mult.f90:0: warning: SSE instruction set disabled, using 387 arithmetics You'd need -msse2 or -msse (or is it -march=pentium4 that enables these?) -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14741