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Commit 76fd79b9 authored by Danila Malyutin's avatar Danila Malyutin
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[X86] Recognize standalone `(1 << nbits) - 1` pattern as bzhi 

This can be thought as a subcase of `x & ((1 << nbits) - 1)` where x == -1

Differential Revision: https://reviews.llvm.org/D155622
parent c1013a6e
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