[Bug tree-optimization/24123] [4.1 Regression] Massive performance regression for -ffast-math due to the recip tree pass

[bonzini at gcc dot gnu dot org]

------- Additional Comments From bonzini at gcc dot gnu dot org  2005-09-30 13:16 -------
hum, strange.  i don't get absolutely any difference before and after recip on
sbisect (and the family of functions it invokes, i.e. polyeval, regula_falsa and
numchanges) in polysolv.cpp from povray 3.6.1.  and indeed by browsing at the
source code, i saw no optimization opportunities there.

uros, can you do the same test? (i.e. compile polysolv.cpp with all your options
+ -fdump-tree-all, and then "diff -u polysolv.cpp.*.loopdone polysolv.cpp.*.recip").

tnx,

Paolo

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24123