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Model some vld3 instructions with REG_SEQUENCE. 

llvm-svn: 103437
This commit is contained in:
Evan Cheng 2010-05-10 21:26:24 +00:00
parent d6908dc4a2
commit 630063aa0d
2 changed files with 89 additions and 32 deletions
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35
llvm/lib/Target/ARM/ARMISelDAGToDAG.cpp
View File

@ -1044,7 +1044,40 @@ SDNode *ARMDAGToDAGISel::SelectVLD(SDNode *N, unsigned NumVecs,
const SDValue Ops[] = { MemAddr, Align, Pred, Reg0, Chain };
std::vector<EVT> ResTys(NumVecs, VT);
ResTys.push_back(MVT::Other);
return CurDAG->getMachineNode(Opc, dl, ResTys, Ops, 5);
SDNode *VLd = CurDAG->getMachineNode(Opc, dl, ResTys, Ops, 5);
if (!llvm::ModelWithRegSequence() || NumVecs < 2)
return VLd;
assert(NumVecs <= 4);
SDValue V0 = SDValue(VLd, 0);
SDValue V1 = SDValue(VLd, 1);
SDValue RegSeq;
if (NumVecs == 2)
RegSeq = SDValue(PairDRegs(MVT::v2i64, V0, V1), 0);
else {
SDValue V2 = SDValue(VLd, 2);
SDValue V3 = (NumVecs == 3)
? SDValue(CurDAG->getMachineNode(TargetOpcode::IMPLICIT_DEF,dl,VT), 0)
: SDValue(VLd, 3);
RegSeq = SDValue(QuadDRegs(MVT::v4i64, V0, V1, V2, V3), 0);
}
SDValue D0 = CurDAG->getTargetExtractSubreg(ARM::DSUBREG_0, dl, VT, RegSeq);
ReplaceUses(SDValue(N, 0), D0);
SDValue D1 = CurDAG->getTargetExtractSubreg(ARM::DSUBREG_1, dl, VT, RegSeq);
ReplaceUses(SDValue(N, 1), D1);
if (NumVecs > 2) {
SDValue D2 = CurDAG->getTargetExtractSubreg(ARM::DSUBREG_2, dl, VT, RegSeq);
ReplaceUses(SDValue(N, 2), D2);
}
if (NumVecs > 3) {
SDValue D3 = CurDAG->getTargetExtractSubreg(ARM::DSUBREG_3, dl, VT, RegSeq);
ReplaceUses(SDValue(N, 3), D3);
}
ReplaceUses(SDValue(N, NumVecs), SDValue(VLd, NumVecs));
return NULL;
}
EVT RegVT = GetNEONSubregVT(VT);

42
llvm/lib/Target/ARM/NEONPreAllocPass.cpp
View File

@ -33,7 +33,7 @@ namespace {
private:
bool FormsRegSequence(MachineInstr *MI,
unsigned FirstOpnd, unsigned NumRegs);
unsigned FirstOpnd, unsigned NumRegs) const;
bool PreAllocNEONRegisters(MachineBasicBlock &MBB);
};
@ -338,18 +338,22 @@ static bool isNEONMultiRegOp(int Opcode, unsigned &FirstOpnd, unsigned &NumRegs,
return false;
}
bool NEONPreAllocPass::FormsRegSequence(MachineInstr *MI,
unsigned FirstOpnd, unsigned NumRegs) {
bool
NEONPreAllocPass::FormsRegSequence(MachineInstr *MI,
unsigned FirstOpnd, unsigned NumRegs) const {
MachineOperand &FMO = MI->getOperand(FirstOpnd);
assert(FMO.isReg() && FMO.getSubReg() == 0 && "unexpected operand");
unsigned VirtReg = FMO.getReg();
assert(TargetRegisterInfo::isVirtualRegister(VirtReg) &&
"expected a virtual register");
if (FMO.isDef()) {
MachineInstr *RegSeq = 0;
unsigned LastSrcReg = 0;
unsigned LastSubIdx = 0;
for (unsigned R = 0; R < NumRegs; ++R) {
MachineOperand &MO = MI->getOperand(FirstOpnd + R);
const MachineOperand &MO = MI->getOperand(FirstOpnd + R);
assert(MO.isReg() && MO.getSubReg() == 0 && "unexpected operand");
unsigned VirtReg = MO.getReg();
assert(TargetRegisterInfo::isVirtualRegister(VirtReg) &&
"expected a virtual register");
if (MO.isDef()) {
// Feeding into a REG_SEQUENCE.
if (!MRI->hasOneNonDBGUse(VirtReg))
return false;
@ -359,7 +363,28 @@ bool NEONPreAllocPass::FormsRegSequence(MachineInstr *MI,
if (RegSeq && RegSeq != UseMI)
return false;
RegSeq = UseMI;
} else {
}
// Make sure trailing operands of REG_SEQUENCE are undef.
unsigned NumExps = (RegSeq->getNumOperands() - 1) / 2;
for (unsigned i = NumRegs * 2 + 1; i < NumExps; i += 2) {
const MachineOperand &MO = RegSeq->getOperand(i);
unsigned VirtReg = MO.getReg();
MachineInstr *DefMI = MRI->getVRegDef(VirtReg);
if (!DefMI || !DefMI->isImplicitDef())
return false;
}
return true;
}
unsigned LastSrcReg = 0;
unsigned LastSubIdx = 0;
for (unsigned R = 0; R < NumRegs; ++R) {
const MachineOperand &MO = MI->getOperand(FirstOpnd + R);
assert(MO.isReg() && MO.getSubReg() == 0 && "unexpected operand");
unsigned VirtReg = MO.getReg();
assert(TargetRegisterInfo::isVirtualRegister(VirtReg) &&
"expected a virtual register");
// Extracting from a Q or QQ register.
MachineInstr *DefMI = MRI->getVRegDef(VirtReg);
if (!DefMI || !DefMI->isExtractSubreg())
@ -378,7 +403,6 @@ bool NEONPreAllocPass::FormsRegSequence(MachineInstr *MI,
return false;
LastSubIdx = SubIdx;
}
}
return true;
}