Nikita Popov 67d247a441 [InstCombine] Decompose more icmps into masks (#110836) ...

Extend decomposeBitTestICmp() to handle cases where the resulting
comparison is of the form `icmp (X & Mask) pred C` with non-zero
`C`. Add a flag to allow code to opt-in to this behavior and use it in
the "log op of icmp" fold infrastructure.

This addresses regressions from #97289.

Proofs: https://alive2.llvm.org/ce/z/hUhdbU

2024-10-04 10:17:23 +02:00

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