[Bug tree-optimization/18595] [4.0 Regression] IV-OPTS is O(N^3)

[dberlin at dberlin dot org]

------- Additional Comments From dberlin at gcc dot gnu dot org  2005-01-24 22:25 -------
Subject: Re:  [4.0 Regression] IV-OPTS is O(N^3)

>
> Other part is that scev tries to be too clever.  Without need to
> represent nonaffine induction variables (that we do not use anywhere)
> we could use more memory efficient representation of ivs.
> Without need to handle symbolic references (that we also do not use
> anywhere, we could store evolutions in a fully instantiated form, and
> we would not need instantiate_parameters/resolve_mixers functions atall.

Uh, symbolic references are or will be used to do data dependence when 
MEM_REF and ARRAY_REF couldn't be generated from the pointers.



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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18595