This is the mail archive of the
gcc-prs@gcc.gnu.org
mailing list for the GCC project.
Re: optimization/10772: Result differences between debug and optmizelibs on linux; and with sol/nt on optimize mode
- From: Wolfgang Bangerth <bangerth at ices dot utexas dot edu>
- To: nobody at gcc dot gnu dot org
- Cc: gcc-prs at gcc dot gnu dot org,
- Date: 14 May 2003 20:56:01 -0000
- Subject: Re: optimization/10772: Result differences between debug and optmizelibs on linux; and with sol/nt on optimize mode
- Reply-to: Wolfgang Bangerth <bangerth at ices dot utexas dot edu>
The following reply was made to PR optimization/10772; it has been noted by GNATS.
From: Wolfgang Bangerth <bangerth@ices.utexas.edu>
To: omar beo <omarbeo@hotmail.com>
Cc: gcc-bugs@gcc.gnu.org, <gcc-gnats@gcc.gnu.org>
Subject: Re: optimization/10772: Result differences between debug and optmize
libs on linux; and with sol/nt on optimize mode
Date: Wed, 14 May 2003 15:52:52 -0500 (CDT)
> But this did not answer the original question, why I?m not getting the same
> results in the other platforms?
Because x86 has a fundamentally broken floating point model with different
accuracy of floats in registers and in memory. x86 FP computations are
fundamentally unreliable if you're used to thinking in what "decent"
processors do.
W.
-------------------------------------------------------------------------
Wolfgang Bangerth email: bangerth@ices.utexas.edu
www: http://www.ices.utexas.edu/~bangerth/