[Bug c/38856] loop iv detection failure, SSA autoincrement

[sergei_lus at yahoo dot com]

------- Comment #2 from sergei_lus at yahoo dot com  2009-01-15 21:03 -------
Andrew, thank you for the prompt reply. 

I have seen PR 31849 and used the patch suggested. Without it autoincrement
would not work at all for either case. But the patch seems to deal with the
case when iv _were_ detected and generally alters cost computation to take that
addressing mode into account, while in this case I see that ivs are _not_
detected in the first place.  This seems to be a more fundamental issue -
should SSA be made "minimal" at that point or should iv detection be improved
to "see" trough “aliased” PHI node – I lack better words to describe it.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38856