Commit 9ae04a77 authored by Craig Topper's avatar Craig Topper
Browse files

[RISCV] Don't set nsw/nuw/exact flag after MachineCombiner reassociation. 

This matches what PowerPC and X86 do.
parent d1e9c7b6

llvm/lib/Target/RISCV/RISCVInstrInfo.cpp

+9 −0
Original line number Diff line number Diff line
@@ -1614,9 +1614,18 @@ void RISCVInstrInfo::setSpecialOperandAttr(MachineInstr &OldMI1, 
                                           MachineInstr &OldMI2,

                                           MachineInstr &NewMI1,

                                           MachineInstr &NewMI2) const {

  // Propagate FP flags from the original instructions.

  // But clear poison-generating flags because those may not be valid now.

  uint32_t IntersectedFlags = OldMI1.getFlags() & OldMI2.getFlags();

  NewMI1.setFlags(IntersectedFlags);

  NewMI1.clearFlag(MachineInstr::MIFlag::NoSWrap);

  NewMI1.clearFlag(MachineInstr::MIFlag::NoUWrap);

  NewMI1.clearFlag(MachineInstr::MIFlag::IsExact);



  NewMI2.setFlags(IntersectedFlags);

  NewMI2.clearFlag(MachineInstr::MIFlag::NoSWrap);

  NewMI2.clearFlag(MachineInstr::MIFlag::NoUWrap);

  NewMI2.clearFlag(MachineInstr::MIFlag::IsExact);

}



void RISCVInstrInfo::finalizeInsInstrs(