[llvm-dev] Why are generic dag combines run before target dag combines?

[Thomas Lively via llvm-dev]

Hi llvm-dev,

I just tried to implement a target-specific dag combine to preempt a
generic dag combine, and I was surprised to see that it didn't work because
the generic dag combines are run first. Does anyone know the rationale for
running the generic dag combines first? I would have expected the target
dag combines to run first because they have more specific information about
what combines will be useful.

Thanks,

Thomas
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