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Commit cb36b8c2 authored by Manman Ren's avatar Manman Ren
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MachineCSE: Update the heuristics for isProfitableToCSE. 

If the result of a common subexpression is used at all uses of the candidate
expression, CSE should not increase the live range of the common subexpression.

rdar://11393714 and rdar://11819721

llvm-svn: 161396
parent 847cea72
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