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The 64-bit semantics of cntlzw are not special, the 32-bit population count is stored as a 64-bit value in the range [0,32]. As a result, it is always zero extended, and it can be added to the PPCISelDAGToDAG peephole optimization as a frontier instruction for the removal of unnecessary zero extensions. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225192 91177308-0d34-0410-b5e6-96231b3b80d8
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