Re: [BK+PATCH] remove __constant_memcpy

Alan Cox (alan@lxorguk.ukuu.org.uk)
17 Apr 2003 14:17:10 +0100

On Iau, 2003-04-17 at 01:57, Jeff Garzik wrote:
> The patch below is the conservative, obvious patch. It only kicks in
> when __builtin_constant_p() is true, and it only applies to the i386
> arch.

You are assuming the compiler is smart about stuff - it doesnt know
SSE/MMX for page copies etc. For small copies it should alays win, but
isn't it best if so to use __builtin_memcpy without our existing
macros not just trust the compiler ?

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