Re: [BK+PATCH] remove __constant_memcpy

["H. Peter Anvin" <hpa@zytor.com>]

Followup to:  <1050585430.31390.32.camel@dhcp22.swansea.linux.org.uk>
By author:    Alan Cox <alan@lxorguk.ukuu.org.uk>
In newsgroup: linux.dev.kernel
> 
> 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 ?
> 

For large or variable-sized copies __builtin_memcpy() just generates a
call to memcpy().  What's more, if you don't specify
-fno-builtin-memcpy memcpy() defaults to __builtin_memcpy()
automatically unless you override it (which Linux does with its
macros.)

	-hpa

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