[Bug middle-end/40029] [4.5 Regression] Big degradation on swim/mgrid on powerpc 32/64 after alias improvement merge (gcc r145494)

[rguenth at gcc dot gnu dot org]

------- Comment #4 from rguenth at gcc dot gnu dot org  2009-05-27 20:57 -------
Actually PRE seems to be more powerful than predictive commoning here.  We
just lose one opportunity while gaining.  With predictive commoning we have
8 loads and 4 stores, 11 multiplications and one division.
With PRE it is 6 loads and 4 stores, 10 multiplications and one division.
The only thing we gain from predictive commoning in 4.4 is unrolling the
loop once.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40029