Sanjay Patel 6a6e808b69 [TargetLowering] improve the default expansion of uaddsat/usubsat ...

This is a subset of what was proposed in:
D59006
...and may overlap with test changes from:
D59174
...but it seems like a good general optimization to turn selects
into bitwise-logic when possible because we never know exactly
what can happen at this stage of DAG combining depending on how
the target has defined things.

Differential Revision: https://reviews.llvm.org/D59066

llvm-svn: 356332

2019-03-17 14:57:40 +00:00

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