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Commit e3f247bc authored by Chris Lattner's avatar Chris Lattner
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In a "seeing the forest through the trees" kinda situation, I realized that a 

complete rewrite of load-vn will make it a bit faster.  This changes speeds up
the gcse pass (which uses load-vn) from 25.45s to 0.42s on the testcase in
PR209.

I've also verified that this gives the exact same results as the old one.

llvm-svn: 11132
parent d3e4d81a
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