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Re: "SSE instruction set disabled?"
- From: Andi Kleen <ak at suse dot de>
- To: "Scott Robert Ladd" <scott at coyotegulch dot com>
- Cc: "Jakub Jelinek" <jakub at redhat dot com>, <gcc at gcc dot gnu dot org>,"Jan Hubicka" <jh at suse dot cz>
- Date: 05 Dec 2002 02:22:25 +0100
- Subject: Re: "SSE instruction set disabled?"
- References: <20021204220754.GU5173@kam.mff.cuni.cz.suse.lists.egcs> <FKEAJLBKJCGBDJJIPJLJMENFDJAA.scott@coyotegulch.com.suse.lists.egcs>
"Scott Robert Ladd" <scott@coyotegulch.com> writes:
> Implied -fpmath=sse may *not* be a good thing under certain circumstances...
One problem is that SSE2 instructions are much bigger than x87. SSE is usually
three bytes or more for everthing, while x87 has shorter encodings. You usually
bloat the program a lot when you use a lot of floating point.
Fortunately that's rare.
-Andi