tree cdc0710c458931e3ea07b911144a432eb2f734d3
parent 1e141a854e0ecaace5925039159daf9dd8426196
author Chandler Carruth <chandlerc@gmail.com> 1325761555 +0000
committer Chandler Carruth <chandlerc@gmail.com> 1325761555 +0000

Prevent a DAGCombine from firing where there are two uses of
a combined-away node and the result of the combine isn't substantially
smaller than the input, it's just canonicalized. This is the first part
of a significant (7%) performance gain for Snappy's hot decompression
loop.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147604 91177308-0d34-0410-b5e6-96231b3b80d8