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c.f. bug 424647
List Archive: gentoo-amd64
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To: gentoo-amd64@g.o
From: Frank Peters <frank.peters@...>
Subject: Re: Re: GCC-4.5.2 Has Serious Problems
Date: Thu, 30 Jun 2011 21:04:29 -0400
On Fri, 01 Jul 2011 02:44:36 +0300
Nikos Chantziaras <realnc@...> wrote:

> 
> And here you can read more thorough information about strict aliasing:
> 
>    http://labs.qt.nokia.com/2011/06/10/type-punning-and-strict-aliasing
> 

You've saved the day in more ways than one.

A few days ago I posted about a possible problem with a floating
point test called the UCBTEST.  After examining the source code
of this test, I see violations of aliasing rules throughout.
It's hard to efficiently manipulate variables without them.

Of course, this code was written before the C99 standard and
so is exempt.  But the use of "-fno-strict-aliasing" will
apply with the UCBTEST as well.

Thanks again for the information.

Frank Peters

 


Replies:
Re: GCC-4.5.2 Has Serious Problems
-- Nikos Chantziaras
Re: Re: GCC-4.5.2 Has Serious Problems
-- Barry Schwartz
Re: GCC-4.5.2 Has Serious Problems
-- Duncan
References:
GCC-4.5.2 Has Serious Problems
-- Frank Peters
Re: GCC-4.5.2 Has Serious Problems
-- Nikos Chantziaras
Re: GCC-4.5.2 Has Serious Problems
-- Nikos Chantziaras
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Updated Jun 28, 2012

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