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From: "dberlin at dberlin dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/14741] missing transformations lead to poorly optimized code
Date: Fri, 28 Jan 2005 17:22:00 -0000 [thread overview]
Message-ID: <20050128172224.12345.qmail@sourceware.org> (raw)
In-Reply-To: <20040326121739.14741.jv244@cam.ac.uk>
------- 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
next prev parent reply other threads:[~2005-01-28 17:22 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-03-26 12:17 [Bug optimization/14741] New: " jv244 at cam dot ac dot uk
2004-03-28 3:20 ` [Bug optimization/14741] " giovannibajo at libero dot it
2004-05-31 5:18 ` [Bug rtl-optimization/14741] " pinskia at gcc dot gnu dot org
2004-05-31 9:26 ` [Bug rtl-optimization/14741] [gfortran] " tobi at gcc dot gnu dot org
2004-09-23 16:48 ` [Bug rtl-optimization/14741] " pinskia at gcc dot gnu dot org
2004-12-23 2:21 ` pinskia at gcc dot gnu dot org
2005-01-18 11:35 ` [Bug tree-optimization/14741] " rakdver at gcc dot gnu dot org
2005-01-19 23:39 ` pinskia at gcc dot gnu dot org
2005-01-23 13:31 ` steven at gcc dot gnu dot org
2005-01-23 19:43 ` steven at gcc dot gnu dot org
2005-01-23 20:00 ` steven at gcc dot gnu dot org
2005-01-28 16:00 ` jv244 at cam dot ac dot uk
2005-01-28 16:23 ` steven at gcc dot gnu dot org
2005-01-28 16:31 ` jv244 at cam dot ac dot uk
2005-01-28 17:22 ` Daniel Berlin
2005-01-28 17:22 ` dberlin at dberlin dot org [this message]
[not found] <bug-14741-6642@http.gcc.gnu.org/bugzilla/>
2005-10-07 21:21 ` steven at gcc dot gnu dot org
2007-07-03 18:10 ` jv244 at cam dot ac dot uk
2009-09-29 18:59 ` jv244 at cam dot ac dot uk
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