[PATCH] D55787: [X86] Use UADDSAT/USUBSAT instead of ADDUS/SUBUS

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon added a comment.

In D55787#1333569 <https://reviews.llvm.org/D55787#1333569>, @craig.topper wrote:

> You’ll need to use an intrinsic to test the changes Simon asked for. The existing combines for X86 do their own split for AVX1.


If that is going to be tricky you can just add a Subtarget->hasInt256() limit and a TODO comment.


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https://reviews.llvm.org/D55787