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Commit fbe1dc24 authored by Zhou Sheng's avatar Zhou Sheng
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If BitWidth equals to ShtAmt, the RHSKnownZero[BitWidth-ShiftAmt-1] will 

crash the opt. Just fix this.

Test case in llvm/test/Transforms/InstCombine/2008-06-05-ashr-crash.ll

llvm-svn: 52003
parent 5eef32ba
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