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Roman Lebedev
b71bcdb26c
This is the naive implementation of x86 BZHI/BEXTR instruction: it takes input and bit count, and extracts low nbits up to bit width. I.e. unlike shift it does not have any UB when nbits >= bitwidth. Which means we don't need a while PHI here, simple select will do. And if it's a select, it should then be trivial to fix codegen to select it to BEXTR/BZHI. See https://bugs.llvm.org/show_bug.cgi?id=34704 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@370369 91177308-0d34-0410-b5e6-96231b3b80d8
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