[PATCH] D47718: [Mips] Use UADDO/ADDCARRY instead of ADDC/ADDE

Mon Jun 4 07:25:55 PDT 2018

deadalnix created this revision.
deadalnix added reviewers: smaksimovic, atanasyan, abeserminji.
Herald added subscribers: arichardson, sdardis.

This changes the DAG to DAG to lower from UADDO/ADDCARRY. It involves some trickery to make sure we do not materialize the carry when it comes from ADDSC.

The spec doesn't mention if ADDWC clear with 20, however, code clearing it was removed as The carry now always comes from a ADDSC and previous version of the code did not seems to worry about bit 20 being set in that case, so my assumption is that this is the proper thing to do.

Repository:
  rL LLVM

https://reviews.llvm.org/D47718

Files:
  lib/Target/Mips/MicroMips32r6InstrInfo.td
  lib/Target/Mips/MicroMipsInstrInfo.td
  lib/Target/Mips/Mips64InstrInfo.td
  lib/Target/Mips/MipsDSPInstrInfo.td
  lib/Target/Mips/MipsInstrInfo.td
  lib/Target/Mips/MipsSEISelDAGToDAG.cpp
  lib/Target/Mips/MipsSEISelDAGToDAG.h
  lib/Target/Mips/MipsSEISelLowering.cpp

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