[Bug rtl-optimization/21395] Performance degradation when building code that uses MMX intrinsics with gcc-4.0.0

[ubizjak at gmail dot com]

------- Comment #10 from ubizjak at gmail dot com  2008-03-23 10:46 -------
(In reply to comment #9)

> So on my duron 4.3 seems to beat 4.4 as i expected from the generated asm.

Can you tell from code dumps of 4.4 vs 4.3, where you think that 4.4 code is
worse than 4.3 for Duron? For Core2, 4.4 avoids store forwarding stall, but I'm
not sure why Duron prefers moves via memory instead of keeping values in %mm
registers.


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ubizjak at gmail dot com changed:

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21395