PR for llvm/llvm-project#54694 #159
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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)
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resolves llvm#54694