Craig Topper fdfdee98ac [DAGCombiner] Teach SimplifySetCC SETUGE X, SINTMIN -> SETLT X, 0 and SETULE X, SINTMAX -> SETGT X, -1. ...

These aren't the canonical forms we'd get from InstCombine, but
we do have X86 tests for them. Recognizing them is pretty cheap.

While there make use of APInt:isSignedMinValue/isSignedMaxValue
instead of creating a new APInt to compare with. Also use
SelectionDAG::getAllOnesConstant helper to hide the all ones
APInt creation.

2020-08-08 22:27:16 -07:00

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