[Bug tree-optimization/31885] Not removing empty loop, scev not finding the correct result

[rakdver at gcc dot gnu dot org]

------- Comment #1 from rakdver at gcc dot gnu dot org  2007-05-10 11:01 -------
This gets fixed by the scev changes of

http://gcc.gnu.org/ml/gcc-patches/2007-05/msg00634.html

(the part about "chrec_contains_undetermined considers NULL_TREE to be a
special automatically generated chrec... However, NULL_TREE is a valid
argument of some of the tree nodes, so chrec_contains_undetermined
ould for example return true for &a[5](which causes some of the
analyses to stop consider such expressions and fail).")

I will commit those separately.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31885