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This adds an instcombine matcher for code that attempts to perform signed saturating arithmetic by casting to a higher type. Unsigned cases are already matched, this adds extra matches for the more complex signed cases, which involves matching the min(max(add a b)) nodes with proper extends to ensure legality. Differential Revision: https://reviews.llvm.org/D68651 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@375505 91177308-0d34-0410-b5e6-96231b3b80d8
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