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[RISCV] Fold (select_cc (xor X, Y), 0, eq/ne, trueV, falseV) -> (select_cc X, Y, eq/ne, trueV, falseV)

Authored by craig.topper on Mar 6 2021, 2:51 PM.



This pattern occurs when lowering for overflow operations
introduce an xor after select_cc has already been formed.

I had to rework another combine that looked for select_cc of an xor
with 1. That xor will now get combined away so we just need to
look for the RHS of the select_cc being 1.

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craig.topper created this revision.Mar 6 2021, 2:51 PM
craig.topper requested review of this revision.Mar 6 2021, 2:51 PM
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luismarques accepted this revision.Mar 7 2021, 6:05 AM

Seems correct.

This revision is now accepted and ready to land.Mar 7 2021, 6:05 AM
This revision was landed with ongoing or failed builds.Mar 7 2021, 9:36 AM
This revision was automatically updated to reflect the committed changes.