[Bug tree-optimization/23821] [4.3/4.4/4.5 Regression] DOM and VRP creating harder to optimize code

[rahul at icerasemi dot com]

------- Comment #25 from rahul at icerasemi dot com  2009-09-25 14:26 -------
Do the fixes in comment #11 and #24 alone solve the missed induction variable
problem?

I'm using the 4.4.1 release branch and it doesn't seem to work for me.
After DOM i get

# i_10 = PHI <x_4(3)>
i_5 = i_10 + 1;

and PHI propagation turns this into

i_5 = x_4 + 1;


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23821