[PATCH] D47927: [RISCV] Custom lower ISD::{U,S}{ADD,SUB}O nodes

[Roger Ferrer Ibanez via Phabricator via llvm-commits]

rogfer01 created this revision.
rogfer01 added a reviewer: asb.
Herald added subscribers: mgrang, edward-jones, zzheng, shiva0217, kito-cheng, niosHD, sabuasal, apazos, simoncook, johnrusso, rbar.

`ISD::UADDO` and `ISD::USUBO` should be relatively straightforward and the current codegen work sensibly (so perhaps we do not need to custom lower them in any way?)

`ISD::SADDO` uses the suggested sequence described in the not found in §2.4 of the RISCV Spec v2.2. `ISD::SSUBO` uses a dual approach.


https://reviews.llvm.org/D47927

Files:
  lib/Target/RISCV/RISCVISelLowering.cpp
  lib/Target/RISCV/RISCVISelLowering.h
  test/CodeGen/RISCV/overflow.ll

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