Sanjoy Das a9f1e27a04 [SCEV] Strengthen SCEVExpander::isHighCostExpansion. ...

Summary:

Teach `isHighCostExpansion` to consider divisions by power-of-two
constants as cheap and add a test case.  This change is needed for a new
user of `isHighCostExpansion` that will be added in a subsequent change.

Depends on D8995.

Reviewers: atrick

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D8993

llvm-svn: 234845

2015-04-14 03:20:32 +00:00

76 KiB

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