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Author SHA1 Message Date
Juneyoung Lee 5af8bacc94 [InstSimplify] Add more poison folding optimizations 
This adds more poison folding optimizations to InstSimplify.

Since all binary operators propagate poison, these are fine.

Also, the precondition of `select cond, undef, x` -> `x` is relaxed to allow the case when `x` is undef.

Reviewed By: nikic

Differential Revision: https://reviews.llvm.org/D104661
 2021-06-23 20:25:24 +09:00
Juneyoung Lee 864dda5fd5 [InstSimplify] Add tests that fold instructions with poison operands (NFC) 2020-12-02 01:01:59 +09:00