Benjamin Kramer 7159a307b9 InstCombine: Don't claim to be able to evaluate any shl in a zexted type. ...

The shift amount may be larger than the type leading to undefined behavior.
Limit the transform to constant shift amounts. While there update the bits to
clear in the result which may enable additional optimizations.

PR15959.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@181604 91177308-0d34-0410-b5e6-96231b3b80d8

2013-05-10 16:26:37 +00:00

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