[Bug tree-optimization/50557] [4.7 Regression] Register pressure increase after reassociation (x86, 32 bits)

[wschmidt at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50557

--- Comment #2 from William J. Schmidt <wschmidt at gcc dot gnu.org> 2011-09-28 12:13:50 UTC ---
The fix for 49749 is intended to remove dependencies between loop iterations. 
One possibility would be to condition the changes on the presence of
-funroll-loops.  Another would be to limit the changes to loops containing
fewer blocks or otherwise measuring simpler control flow.

To help make a good decision here, can you please try your test case with
-funroll-loops before and after the fix for 49749?