Re: optimization/9319: slower code generated for simple loop on linux

[Eric Botcazou <ebotcazou@libertysurf.fr>]

The following reply was made to PR optimization/9319; it has been noted by GNATS.

From: Eric Botcazou <ebotcazou@libertysurf.fr>
To: Amnon Cohen <amnon_cohen@yahoo.com>
Cc: Richard Henderson <rth@redhat.com>,
 gcc-bugs@gcc.gnu.org,
 gcc-prs@gcc.gnu.org,
 nobody@gcc.gnu.org,
 gcc-gnats@gcc.gnu.org
Subject: Re: optimization/9319: slower code generated for simple loop on linux
Date: Thu, 16 Jan 2003 20:12:03 +0100

 > I have done a few more tests, and it seems
 > that this is a regression
 > on all platforms  (not just intel) introduced by
 > gcc3.1
 
 Confirmed. The regression actually started to show up in gcc 3.0.4 (that'=
 s why=20
 I asked you to post the assembly code, I only had the 3.0.4 version on my=
 =20
 system) and has affected all versions since then.
 
 > The performance is significantly reduced on intel
 > linux and on Solaris (I have not sent solaris asm
 > files, let me know if you need them). So I do
 > not think that this is architecture related
 
 A nasty side-effect of the patch that fixed PR optimization/5076, which w=
 as=20
 foreseen by Richard: http://gcc.gnu.org/ml/gcc-patches/2002-01/msg02111.h=
 tml
 
 Richard, do you think that the problem is worth looking into or that it i=
 s a=20
 lost cause ?
 
 --=20
 Eric Botcazou