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Re: Wow!

From: "Daniel Berlin" <dberlin at dberlin dot org>
To: "Uros Bizjak" <ubizjak at gmail dot com>
Cc: GCC <gcc at gcc dot gnu dot org>
Date: Mon, 2 Jul 2007 14:37:23 -0400
Subject: Re: Wow!
References: <46894415.4080903@gmail.com>

I'm curious if it was the pre/fre changes.  can you try -fno-tree-pre
and -fno-tree-fre and see if it slows down again?

On 7/2/07, Uros Bizjak <ubizjak@gmail.com> wrote:

Hello!

It is worth noticing that latest changes to gcc brought more than 75%
speed-up on Polyhedron aermod.f90 benchmark [1]. I can confirm this on
32bit nocona, and double-checked on 64bit core2:

gcc -O3 -funroll-loops -ftree-vectorize -ffast-math:

(GCC) 4.3.0 20070622 : 0m33.530s
(GCC) 4.3.0 20070702 : 0m11.805s

[1]:
http://www.suse.de/~gcctest/c++bench/polyhedron/polyhedron-summary.txt-2-0.html

Uros.

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