[llvm-dev] Deprecating ADDC/ADDE/SUBC/SUBE

[Friedman, Eli via llvm-dev]

On 5/30/2018 10:29 AM, Krzysztof Parzyszek via llvm-dev wrote:
> For targets where ADDCARRY and SUBCARRY are legal, would it make sense 
> to expand ADDC/UADDO/ADDE/etc. into ADDCARRY (and same for sub)?

SelectionDAG will never generate ADDC/ADDE on targets where they aren't 
legal.  Targets which custom-lower ADDCARRY generally also custom-lower 
UADDO; not sure what sort of expansion you're thinking of.

-Eli

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