Anton Korobeynikov a9790d739a Some cheap DAG combine goodness for multiplication with a particular constant.
This can be extended later on to handle more "complex" constants.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103881 91177308-0d34-0410-b5e6-96231b3b80d8
2010-05-15 18:16:59 +00:00
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