linux-kernel - Re: [PATCH 2/4] x86/xor: improve XMM register spill/fill

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Date:	Mon, 10 Sep 2012 07:05:48 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Jan Beulich <JBeulich@...e.com>
CC:	mingo@...e.hu, tglx@...utronix.de, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] x86/xor: improve XMM register spill/fill

On 09/10/2012 05:38 AM, Jan Beulich wrote:
> +/*
> + * By forcing the alignment beyond the default of 16 bytes, we make the
> + * compiler guarantee the alignment. Passing -mincoming-stack-boundary=3
> + * (which would have been the better global alternative, as the kernel
> + * never guarantees better stack alignment) isn't permitted on x86-64.
> + */

The very latest gcc should handle it, and in fact we compile with 
-mstack-alignment=3 if gcc accepts it (if it is not yet upstream it will 
be soon.)  This affects the validity of this patch.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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