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Commit 09020ec2 authored by Nikita Popov's avatar Nikita Popov
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[InstCombine] Handle usubo always overflow 

Check AlwaysOverflow condition for usubo. The implementation is the
same as the existing handling for uaddo and umulo. Handling for saddo
and ssubo will follow (smulo doesn't have the necessary ValueTracking
support).

Differential Revision: https://reviews.llvm.org/D60483

llvm-svn: 358052
parent 596cbeb7
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