From: "DeHackEd" <Not DOT given AT out>
References: <1998Mar16 DOT 112343 DOT 6612 AT news>
Subject: Re: -ffast-math option
Date: Mon, 16 Mar 1998 10:56:52 -0500
Lines: 33
Message-ID: <eulbWRPU9GA.314@upnetnews02.moswest.msn.net>
Newsgroups: comp.os.msdos.djgpp
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Precedence: bulk

Extracted from:
info gcc
search -ffast-math

This option allows GCC to violate some ANSI or IEEE rules and/or specifications
in the interest of optimizing code for speed.  For example, it allows the
compiler to assume arguments to the `sqrt' function are non-negative numbers and
that no floating-point values are NaNs.

This option should never be turned on by any `-O' option since it can result in
incorrect output for programs which depend on an exact implementation of IEEE or
ANSI rules/specifications for math functions.


--
"DeHackEd"

EMail address not given out due to low-life spammers.



Gautier wrote in message <1998Mar16 DOT 112343 DOT 6612 AT news>...
>... what is its effect, precisely ?
>
>--
>Gautier
>
>--------
>Homepage: http://www.unine.ch/math/Personnel/Assistants/Gautier/Montmollin.html
>Software: http://www.unine.ch/math/Personnel/Assistants/Gautier/Gaut_FTP.htm
>