[LLVMdev] Whether GEP fits an addressing mode

[Jingyue Wu]

Hi,

I wonder there's an API that determines whether an getelementptr can be
completely folded into an addressing mode. I need one such interface in my
own transformation pass. I saw TTI has a low-level interface on addressing
mode (isLegalAddressingMode), but requires the user to compute the base
register, offset, scale, and etc.

I am writing one such interface right now that computes low-level info
(e.g. base and offset) from a GEP and calls isLegalAddressingMode, but
please shout out if you know any existing/better way.

Thanks,
Jingyue
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