rawhide report: 20050510 changes

Owen Taylor otaylor at redhat.com
Tue May 10 15:30:06 UTC 2005


On Tue, 2005-05-10 at 08:26 -0400, Jakub Jelinek wrote:

> a) on x86-64 this is unnecessary, all x86-64's have -msse2 by default
> b) -msse2 implies -msse
> c) if you use -msse2 in CFLAGS for all files, you can't run the latest
>    GIMP on e.g. Pentium2, or pre-x86_64 AMD chips.
>    -msse2 should be ONLY used on sources that have SSE/SSE2 stuff in it,
>    and GIMP should make sure that no routine from those sources will be
>    ever called on pre-SSE2 chips

This sounds like a big pain ... shouldn't there be a way to say 
"use sse2/sse only for builtins" ? 

Without that, there is no way to use builtins in single functions; you
need to have one file for sse2, one for sse, one for mmx, and do the
detection of the current processor somewhere else entirely.

						Owen

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