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Re: [Chicken-users] GCC, dereferencing type-punned pointer...

From: felix
Subject: Re: [Chicken-users] GCC, dereferencing type-punned pointer...
Date: Sun, 07 Sep 2003 09:26:47 +0200
User-agent: Opera7.11/Linux M2 build 406

On Sat, 06 Sep 2003 09:01:10 +0200 (CEST), <address@hidden> wrote:

On 05 Sep 2003, Johannes Groedem <address@hidden> wrote:
I'm getting hundreds (thousands?) of these warnings from GCC (3.3.2
20030831 (Debian prerelease)):

warning: dereferencing type-punned pointer will break
strict-aliasing rules

For 3.3.1 too (this started in the 3.3 branch).

I'm just wondering whether I can safely ignore them,

From my experience: yes.
But I typically modify configure as follows:

sed -i -e "s/-fstrict-aliasing/-fno-strict-aliasing/g" configure

-O3 normally implies -fstrict-aliasing, therefore you have to turn
it off explicitly.
I don't know whether performance changes ... Does anybody have numbers?

Sorry, no hard numbers yet, but it does give slightly better performance.
Sven, have you had any problems with -fstrict-aliasing? I would be interested
how your nallch performs with/without that option.


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