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The popcntw instruction is available whenever the popcntd instruction is available, and performs a separate popcnt on the lower and upper 32-bits. Ignoring the high-order count, this can be used for the 32-bit input case (saving on the explicit zero extension otherwise required to use popcntd). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@178470 91177308-0d34-0410-b5e6-96231b3b80d8
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