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Commit 27e89ba2 authored by David Majnemer's avatar David Majnemer
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[InstCombine] X - 0 is equal to X, not undef 

A refactoring made @llvm.ssub.with.overflow.i32(i32 %X, i32 0) transform
into undef instead of %X.

This fixes PR23624.

llvm-svn: 237968
parent eb31b68c
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