Roman Lebedev 4fc417ec37 [DAGCombiner] convertBuildVecZextToBuildVecWithZeros(): rework split factor calculation ...

The original computation was both making assumptions that do not hold
in practice, and being overly pessimistic. We should just check
every possible split factor, and pick the best one.

Fixes https://github.com/llvm/llvm-project/issues/59781

2023-01-02 18:34:35 +03:00

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