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AArch64/GlobalISel: Remove some null checks for getVRegDef 

getVRegDef is not allowed to fail for generic virtual registers, so
there's not much point in checking it.
This commit is contained in:
Matt Arsenault 2022-04-09 09:11:06 -04:00
parent 96c9190761
commit e38c5fded6
1 changed files with 13 additions and 29 deletions
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24
llvm/lib/Target/AArch64/GISel/AArch64InstructionSelector.cpp
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@ -1748,7 +1748,6 @@ static Optional<int64_t> getVectorShiftImm(Register Reg,
MachineRegisterInfo &MRI) {
assert(MRI.getType(Reg).isVector() && "Expected a *vector* shift operand");
MachineInstr *OpMI = MRI.getVRegDef(Reg);
assert(OpMI && "Expected to find a vreg def for vector shift operand");
return getAArch64VectorSplatScalar(*OpMI, MRI);
}
@ -2979,8 +2978,6 @@ bool AArch64InstructionSelector::select(MachineInstr &I) {
if (!SrcTy.isVector() && SrcTy.getSizeInBits() == 32 &&
ShiftTy.getSizeInBits() == 64) {
assert(!ShiftTy.isVector() && "unexpected vector shift ty");
assert(MRI.getVRegDef(ShiftReg) &&
"could not find a vreg definition for shift amount");
// Insert a subregister copy to implement a 64->32 trunc
auto Trunc = MIB.buildInstr(TargetOpcode::COPY, {SrcTy}, {})
.addReg(ShiftReg, 0, AArch64::sub_32);
@ -5043,9 +5040,6 @@ bool AArch64InstructionSelector::tryOptSelect(GSelect &I) {
}
// Is the condition defined by a compare?
if (!CondDef)
return false;
unsigned CondOpc = CondDef->getOpcode();
if (CondOpc != TargetOpcode::G_ICMP && CondOpc != TargetOpcode::G_FCMP) {
if (tryOptSelectConjunction(I, *CondDef))
@ -6073,8 +6067,6 @@ AArch64InstructionSelector::selectExtendedSHL(
MachineRegisterInfo &MRI = Root.getParent()->getMF()->getRegInfo();
MachineInstr *OffsetInst = MRI.getVRegDef(Offset.getReg());
if (!OffsetInst)
return None;
unsigned OffsetOpc = OffsetInst->getOpcode();
bool LookedThroughZExt = false;
@ -6228,7 +6220,7 @@ AArch64InstructionSelector::selectAddrModeRegisterOffset(
// We need a GEP.
MachineInstr *Gep = MRI.getVRegDef(Root.getReg());
if (!Gep || Gep->getOpcode() != TargetOpcode::G_PTR_ADD)
if (Gep->getOpcode() != TargetOpcode::G_PTR_ADD)
return None;
// If this is used more than once, let's not bother folding.
@ -6408,14 +6400,12 @@ AArch64InstructionSelector::selectAddrModeUnscaled(MachineOperand &Root,
return None;
MachineInstr *RootDef = MRI.getVRegDef(Root.getReg());
if (!RootDef)
return None;
MachineOperand &OffImm = RootDef->getOperand(2);
if (!OffImm.isReg())
return None;
MachineInstr *RHS = MRI.getVRegDef(OffImm.getReg());
if (!RHS || RHS->getOpcode() != TargetOpcode::G_CONSTANT)
if (RHS->getOpcode() != TargetOpcode::G_CONSTANT)
return None;
int64_t RHSC;
MachineOperand &RHSOp1 = RHS->getOperand(1);
@ -6483,9 +6473,6 @@ AArch64InstructionSelector::selectAddrModeIndexed(MachineOperand &Root,
return None;
MachineInstr *RootDef = MRI.getVRegDef(Root.getReg());
if (!RootDef)
return None;
if (RootDef->getOpcode() == TargetOpcode::G_FRAME_INDEX) {
return {{
[=](MachineInstrBuilder &MIB) { MIB.add(RootDef->getOperand(1)); },
@ -6506,7 +6493,7 @@ AArch64InstructionSelector::selectAddrModeIndexed(MachineOperand &Root,
MachineOperand &RHS = RootDef->getOperand(2);
MachineInstr *LHSDef = MRI.getVRegDef(LHS.getReg());
MachineInstr *RHSDef = MRI.getVRegDef(RHS.getReg());
if (LHSDef && RHSDef) {
int64_t RHSC = (int64_t)RHSDef->getOperand(1).getCImm()->getZExtValue();
unsigned Scale = Log2_32(Size);
if ((RHSC & (Size - 1)) == 0 && RHSC >= 0 && RHSC < (0x1000 << Scale)) {
@ -6522,7 +6509,6 @@ AArch64InstructionSelector::selectAddrModeIndexed(MachineOperand &Root,
}};
}
}
}
// Before falling back to our general case, check if the unscaled
// instructions can handle this. If so, that's preferable.
@ -6565,8 +6551,6 @@ AArch64InstructionSelector::selectShiftedRegister(MachineOperand &Root,
// Check if the operand is defined by an instruction which corresponds to
// a ShiftExtendType. E.g. a G_SHL, G_LSHR, etc.
MachineInstr *ShiftInst = MRI.getVRegDef(Root.getReg());
if (!ShiftInst)
return None;
AArch64_AM::ShiftExtendType ShType = getShiftTypeForInst(*ShiftInst);
if (ShType == AArch64_AM::InvalidShiftExtend)
return None;
@ -6721,7 +6705,7 @@ AArch64InstructionSelector::selectArithExtendedRegister(
// to.
if (Ext == AArch64_AM::UXTW && MRI.getType(ExtReg).getSizeInBits() == 32) {
MachineInstr *ExtInst = MRI.getVRegDef(ExtReg);
if (ExtInst && isDef32(*ExtInst))
if (isDef32(*ExtInst))
return None;
}
}