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archived-llvm/test/CodeGen/SystemZ
Elliot Colp b22cfb7859 [SystemZ] Remove AND mask of bottom 6 bits when result is used for shift/rotate
On SystemZ, shift and rotate instructions only use the bottom 6 bits of the shift/rotate amount.
Therefore, if the amount is ANDed with an immediate mask that has all of the bottom 6 bits set, we
can remove the AND operation entirely.

Differential Revision: http://reviews.llvm.org/D21854


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@274650 91177308-0d34-0410-b5e6-96231b3b80d8
2016-07-06 18:13:11 +00:00
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