Antonio Frighetto d2a26a7bd5 [InstCombine] Do not perform binop-of-shuffle when mask is poison ...

A miscompilation issue has been addressed with refined checking.
Shuffle masks operand may be turned into `poison` if this does
not lead to observable changes. This however may not guarantee
binop to binop-of-shuffle replacement to be sound anymore.

Fixes: https://github.com/llvm/llvm-project/issues/82052.

2024-02-20 08:37:51 +01:00

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