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ee84973420
We already exploit a number of instructions specific to z196, but not yet POPCNT. Add support for the population-count facility, MC support for the POPCNT instruction, CodeGen support for using POPCNT, and implement the getPopcntSupport TargetTransformInfo hook. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@233689 91177308-0d34-0410-b5e6-96231b3b80d8
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