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Commit 20a6db5a authored by Craig Topper's avatar Craig Topper
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[X86] Create PSUBUS from (add (umax X, C), -C) 

InstCombine seems to canonicalize or PSUB patter into a max with the cosntant and an add with an inverse of the constant.

This patch recognizes this pattern and turns it into PSUBUS. Future work could improve undef element handling.

Fixes some of PR40053

Differential Revision: https://reviews.llvm.org/D55780

llvm-svn: 349519
parent b536bf52
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