[PATCH] D89222: [X86][SelectionDAG] WIP Add SADDO_CARRY and SSUBO_CARRY to support multipart signed add/sub overflow legalization.

Craig Topper via Phabricator via llvm-commits llvm-commits at lists.llvm.org
Mon Oct 12 00:54:15 PDT 2020


craig.topper created this revision.
craig.topper added reviewers: RKSimon, spatel, efriedma.
Herald added subscribers: ecnelises, pengfei, hiraditya.
Herald added a reviewer: ecnelises.
Herald added a project: LLVM.
craig.topper requested review of this revision.

This passes existing X86 test but I'm not sure if it handles all type
legalization cases it needs to.

Alternative to D89200 <https://reviews.llvm.org/D89200>


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D89222

Files:
  llvm/include/llvm/CodeGen/ISDOpcodes.h
  llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  llvm/lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp
  llvm/lib/CodeGen/SelectionDAG/LegalizeTypes.h
  llvm/lib/CodeGen/SelectionDAG/SelectionDAGDumper.cpp
  llvm/lib/Target/X86/X86ISelLowering.cpp
  llvm/test/CodeGen/X86/known-bits.ll
  llvm/test/CodeGen/X86/sadd_sat.ll
  llvm/test/CodeGen/X86/sadd_sat_plus.ll
  llvm/test/CodeGen/X86/sadd_sat_vec.ll
  llvm/test/CodeGen/X86/ssub_sat.ll
  llvm/test/CodeGen/X86/ssub_sat_plus.ll
  llvm/test/CodeGen/X86/ssub_sat_vec.ll
  llvm/test/CodeGen/X86/vec_saddo.ll
  llvm/test/CodeGen/X86/vec_ssubo.ll

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