[Bug tree-optimization/35164] [4.3 regression] Unable to coalesce ab SSA_NAMEs

[rakdver at kam dot mff dot cuni dot cz]

------- Comment #4 from rakdver at kam dot mff dot cuni dot cz  2008-02-13 04:05 -------
Subject: Re:  [4.3 regression] Unable to coalesce ab SSA_NAMEs

> Actually it is the call to rewrite_into_loop_closed_ssa inserting these
> PHIs.  I don't know if it actually makes sense to speak of loop-closed SSA form
> if we deal with abnormal SSA names - Zdenek?

Some pieces of the scev analysis assume lcSSA for all gimple_reg SSA
names, regardless of whether they appear in abnormal phi nodes or not.
The phi nodes created by lcSSA conversion should always be eliminable,
though.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35164