[Bug tree-optimization/32183] [4.3 Regression] reassoc2 can more extra calculations into a loop

[pinskia at gcc dot gnu dot org]

------- Comment #14 from pinskia at gcc dot gnu dot org  2007-06-02 02:23 -------
(In reply to comment #13)
> Has anyone measured impact of adding DCE on SPEC CPU 2000/2006 peformance?

Take a look at:
http://www.suse.de/~gcctest/SPEC/CFP/sb-haydn-head-64-32o-32bit/172_mgrid_recent_big.png
And:
http://www.suse.de/~gcctest/SPEC/CFP/sb-haydn-head-64-32o-32bit/301_apsi_recent_big.png

You will see two big jumps, those are from the impact of adding the DCE.

Likewise for ia64:
http://www.suse.de/~gcctest/SPEC/CFP/sb-terbium-head-64/172_mgrid_recent_big.png
http://www.suse.de/~gcctest/SPEC/CFP/sb-terbium-head-64/301_apsi_recent_big.png

And amd64:
http://www.suse.de/~gcctest/SPEC/CFP/sb-vangelis-head-64/172_mgrid_recent_big.png
http://www.suse.de/~gcctest/SPEC/CFP/sb-vangelis-head-64/301_apsi_recent_big.png

Thanks,
Andrew Pinski 


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32183