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Re: gcc -O3 bug

From: Zack Weinberg <zack at codesourcery dot com>
To: Zhou Jingtao <zhoujing at comp dot nus dot edu dot sg>
Cc: gcc at gcc dot gnu dot org
Date: Thu, 4 Jul 2002 20:12:04 -0700
Subject: Re: gcc -O3 bug
References: <1158.137.132.82.193.1025835110.squirrel@mysoc.nus.edu.sg>

On Fri, Jul 05, 2002 at 10:11:50AM +0800, Zhou Jingtao wrote:
> I heard that gcc has a bug when trying to use the option "-O3". I am
> wondering what it is and whether gcc-3.1 has fixed the bug.
> Thanks in advance.

There certainly were bugs in -O3, and some of them were indeed fixed
in the 3.1 release.  Whether the bug you heard about has been fixed,
we do not know; we do not know which bug it was.

We suggest you try 3.1 and see if it works.

Keep in mind that -O3 enables optimizations that generally make code
worse, not better.  Use it only if you know it will improve your code.

zw

References:
- gcc -O3 bug
  - From: Zhou Jingtao

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