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[Bug target/59405] Incorrect FP<->MMX transition during call/ret
- From: "ubizjak at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Fri, 06 Dec 2013 12:30:37 +0000
- Subject: [Bug target/59405] Incorrect FP<->MMX transition during call/ret
- Auto-submitted: auto-generated
- References: <bug-59405-4 at http dot gcc dot gnu dot org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59405
--- Comment #7 from UroÅ Bizjak <ubizjak at gmail dot com> ---
(In reply to H.J. Lu from comment #6)
> I think this is a dup of PR48397.
No, this one happens due to missing interdependencies between x87 and MMX
registers. We could make all MMX instructions dependant on st(0) register, but
this would mean that no MMX instruction whatsoever will be reordered.