Elliot Colp bc2cfc2291 [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

llvm-svn: 274650

2016-07-06 18:13:11 +00:00

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