[PATCH] D21854: Remove AND mask of bottom 6 bits when result is used for SystemZ shift/rotate

[Elliot Colp via llvm-commits]

colpell created this revision.
colpell added a reviewer: uweigand.
colpell added a subscriber: llvm-commits.

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.

http://reviews.llvm.org/D21854

Files:
  lib/Target/SystemZ/SystemZInstrInfo.td
  lib/Target/SystemZ/SystemZOperands.td
  test/CodeGen/SystemZ/rot-01.ll
  test/CodeGen/SystemZ/rot-02.ll
  test/CodeGen/SystemZ/shift-12.ll

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