Reviewers: titzer,
Description:
More aggressive reuse of spill slots in the register allocator.
Two improvements:
- At phi nodes, we now try to merge operands into one spill slot and
then reuse the spill slot for the phi.
- After register allocation we merge disjoint spill slots.
With this change, I see about 4% improvement in zlib.
BUG=
Please review this at https://codereview.chromium.org/310003003/
SVN Base: https://v8.googlecode.com/svn/branches/bleeding_edge
Affected files (+309, -44 lines):
M src/hydrogen.cc
M src/lithium-allocator.h
M src/lithium-allocator.cc
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