[Bug tree-optimization/39839] [4.3/4.4/4.5/4.6 regression] loop invariant motion causes stack spill

[sandra at codesourcery dot com]

------- Comment #13 from sandra at codesourcery dot com  2010-07-11 01:22 -------
Some further analysis:

The part of my PR42505 patch that made the difference was the change to
estimate_register_pressure_cost in cfgloopanal.c, to make it exclude the
call-clobbered registers.  This part was finally committed separately in a
revised version as r162043.

I'm still looking into what to do about the test case and 4.5 backport.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39839