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2 Commits

Author SHA1 Message Date
David Majnemer
49c14f54b2 InstSimplify: Exact shifts of X by Y are X if X has the lsb set 
Exact shifts may not shift out any non-zero bits. Use computeKnownBits
to determine when this occurs and just return the left hand side.

This fixes PR21477.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@221325 91177308-0d34-0410-b5e6-96231b3b80d8
 2014-11-05 00:59:59 +00:00
David Majnemer
dea8105323 InstCombine: Simplify FoldICmpCstShrCst 
This function was complicated by the fact that it tried to perform
canonicalizations that were already preformed by InstSimplify.  Remove
this extra code and move the tests over to InstSimplify.  Add asserts to
make sure our preconditions hold before we make any assumptions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@220314 91177308-0d34-0410-b5e6-96231b3b80d8
 2014-10-21 19:51:55 +00:00