[Bug target/34256] mmx and movd/movq on x86_64

[ubizjak at gmail dot com]

------- Comment #2 from ubizjak at gmail dot com  2007-11-28 12:45 -------
Created an attachment (id=14653)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=14653&action=view)
Patch to adjust mmx move instructions

It looks that mmx move instructions need some tuning.  Attached patch fixes
your problems and generates (-march=core2):

foo:
.LFB4:
        movq    x(%rip), %mm0
        paddd   y(%rip), %mm0
        movd    %mm0, %rax
        ret

Since these RA adjustments are very fragile, this patch is not appropriate for
stage3.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34256