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PR for llvm/llvm-project#54694 #159

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PR for llvm/llvm-project#54694 #159

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Commits on Apr 8, 2022

  1. [x86] Fix infinite loop inside DAG combiner with lzcnt feature. 

    The issue affects targets supporting fast-lzcnt such as btver2.
This removes extraneous zext/trunc node insertions to fix the infinite
loop.
This fixes Issue llvm#54694

Differential Revision: https://reviews.llvm.org/D122900

Reviewed By: RKSimon, spatel, lebedev.ri

(cherry picked from commit a3d5f1c)
    @goussepi @llvmbot
    goussepi authored and llvmbot committed Apr 8, 2022
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