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Commit 28a2d449 authored by Owen Anderson's avatar Owen Anderson
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Make a bunch of optimizations for compile time to GVNPRE, including smarter... 

Make a bunch of optimizations for compile time to GVNPRE, including smarter set unions, deferring blocks rather than computing maximal sets, and smarter use of sets.  With these enhancements, the time to optimize 273.perlbmk goes from 5.3s to 2.7s.

llvm-svn: 37698
parent 6d7b6f1a
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