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Commit 7fa8c430 authored by Benjamin Kramer's avatar Benjamin Kramer
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InstCombine: fold (A << C) == (B << C) --> ((A^B) & (~0U >> C)) == 0 

Anding and comparing with zero can be done in a single instruction on
most archs so this is a bit cheaper.

llvm-svn: 233291
parent c632cda8
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