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Commit b39e0dec authored by Owen Anderson's avatar Owen Anderson
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Put a heuristic in place to prevent GVN from falling into bad cases with... 

Put a heuristic in place to prevent GVN from falling into bad cases with massively complicated CFGs.
This speeds up a particular testcase from 12+ hours to 5 seconds with little perceptible loss of quality.

llvm-svn: 55391
parent 3c76cb5c
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