[Bug tree-optimization/19590] IVs with the same evolution not eliminated

[steven at gcc dot gnu dot org]

------- Comment #7 from steven at gcc dot gnu dot org  2005-11-14 10:32 -------
It would be more interesting to measure than think ;-)

My experience is that when it is in Briggs' test suite, it usually also happens
in actually useful code. But, only the numbers will tell :-)

Zdenek is right, it's just a matter of comparing the evolutions of loop PHI
nodes.  Instrumenting the compiler to count how often this happens is half the
work of implementing the optimization if it turns out to be useful. 


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19590