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c34fde7b
2017 Jun 27
2
Question about ISD::SUBCARRY
Dear all,
a couple of new generic DAG nodes ISD::ADCARRY and ISD::SUBCARRY were recently introduced in https://reviews.llvm.org/D29872
These nodes have three inputs and two outputs, the second output being the "carry". I understand that carry is well defined for ADDCARRY but my question is about SUBCARRY.
Some architectures set the "carry" of a "x - y" subtraction