linux-kernel - Re: gcc-4.3 considers unaligned accesses on X86 as undefined

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Message-ID: <20080325211102.44aa7ce7@core>
Date:	Tue, 25 Mar 2008 21:11:02 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Török Edwin <edwintorok@...il.com>
Cc:	"Thomas Gleixner mingo@...hat.com" <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: gcc-4.3 considers unaligned accesses on X86 as undefined

On Tue, 25 Mar 2008 22:51:09 +0200
Török Edwin <edwintorok@...il.com> wrote:

> Hello x86 architecture maintainers,
> 
> GCC-4.3 now considers that it is undefined behaviour to access memory
> through an int*  that is not aligned to sizeof(int).
> At -O3 it generates vectorized code 

FPU/MMX/SSE are not available or usable for the kernel anyway fortunately
in this case.

Alan
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