STATISTIC(NumTailCalls, "Number of tail calls");
-// This option should go away when tail calls fully work.
+// This option should go away when Machine LICM is smart enough to hoist a
+// reg-to-reg VDUP.
static cl::opt<bool>
-EnableARMTailCalls("arm-tail-calls", cl::Hidden,
- cl::desc("Generate tail calls (TEMPORARY OPTION)."),
- cl::init(true));
+EnableARMVDUPsplat("arm-vdup-splat", cl::Hidden,
+ cl::desc("Generate VDUP for integer constant splats (TEMPORARY OPTION)."),
+ cl::init(false));
static cl::opt<bool>
EnableARMLongCalls("arm-long-calls", cl::Hidden,
ARMTargetLowering::ARMTargetLowering(TargetMachine &TM)
: TargetLowering(TM, createTLOF(TM)) {
Subtarget = &TM.getSubtarget<ARMSubtarget>();
+ RegInfo = TM.getRegisterInfo();
if (Subtarget->isTargetDarwin()) {
// Uses VFP for Thumb libfuncs if available.
// doesn't yet know how to not do that for SjLj.
setExceptionSelectorRegister(ARM::R0);
setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i32, Expand);
- // Handle atomics directly for ARMv[67] (except for Thumb1), otherwise
- // use the default expansion.
- bool canHandleAtomics =
- (Subtarget->hasV7Ops() ||
- (Subtarget->hasV6Ops() && !Subtarget->isThumb1Only()));
- if (canHandleAtomics) {
+ // ARMv6 Thumb1 (except for CPUs that support dmb / dsb) and earlier use
+ // the default expansion.
+ if (Subtarget->hasDataBarrier() ||
+ (Subtarget->hasV6Ops() && !Subtarget->isThumb1Only())) {
// membarrier needs custom lowering; the rest are legal and handled
// normally.
setOperationAction(ISD::MEMBARRIER, MVT::Other, Custom);
}
setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1, Expand);
- if (!UseSoftFloat && Subtarget->hasVFP2() && !Subtarget->isThumb1Only())
+ if (!UseSoftFloat && Subtarget->hasVFP2() && !Subtarget->isThumb1Only()) {
// Turn f64->i64 into VMOVRRD, i64 -> f64 to VMOVDRR
// iff target supports vfp2.
setOperationAction(ISD::BIT_CONVERT, MVT::i64, Custom);
+ setOperationAction(ISD::FLT_ROUNDS_, MVT::i32, Custom);
+ }
// We want to custom lower some of our intrinsics.
setOperationAction(ISD::INTRINSIC_WO_CHAIN, MVT::Other, Custom);
benefitFromCodePlacementOpt = true;
}
+std::pair<const TargetRegisterClass*, uint8_t>
+ARMTargetLowering::findRepresentativeClass(EVT VT) const{
+ const TargetRegisterClass *RRC = 0;
+ uint8_t Cost = 1;
+ switch (VT.getSimpleVT().SimpleTy) {
+ default:
+ return TargetLowering::findRepresentativeClass(VT);
+ // Use DPR as representative register class for all floating point
+ // and vector types. Since there are 32 SPR registers and 32 DPR registers so
+ // the cost is 1 for both f32 and f64.
+ case MVT::f32: case MVT::f64: case MVT::v8i8: case MVT::v4i16:
+ case MVT::v2i32: case MVT::v1i64: case MVT::v2f32:
+ RRC = ARM::DPRRegisterClass;
+ break;
+ case MVT::v16i8: case MVT::v8i16: case MVT::v4i32: case MVT::v2i64:
+ case MVT::v4f32: case MVT::v2f64:
+ RRC = ARM::DPRRegisterClass;
+ Cost = 2;
+ break;
+ case MVT::v4i64:
+ RRC = ARM::DPRRegisterClass;
+ Cost = 4;
+ break;
+ case MVT::v8i64:
+ RRC = ARM::DPRRegisterClass;
+ Cost = 8;
+ break;
+ }
+ return std::make_pair(RRC, Cost);
+}
+
const char *ARMTargetLowering::getTargetNodeName(unsigned Opcode) const {
switch (Opcode) {
default: return 0;
return TargetLowering::getRegClassFor(VT);
}
+// Create a fast isel object.
+FastISel *
+ARMTargetLowering::createFastISel(FunctionLoweringInfo &funcInfo) const {
+ return ARM::createFastISel(funcInfo);
+}
+
/// getFunctionAlignment - Return the Log2 alignment of this function.
unsigned ARMTargetLowering::getFunctionAlignment(const Function *F) const {
return getTargetMachine().getSubtarget<ARMSubtarget>().isThumb() ? 1 : 2;
}
+/// getMaximalGlobalOffset - Returns the maximal possible offset which can
+/// be used for loads / stores from the global.
+unsigned ARMTargetLowering::getMaximalGlobalOffset() const {
+ return (Subtarget->isThumb1Only() ? 127 : 4095);
+}
+
Sched::Preference ARMTargetLowering::getSchedulingPreference(SDNode *N) const {
unsigned NumVals = N->getNumValues();
if (!NumVals)
return Sched::RegPressure;
}
+unsigned
+ARMTargetLowering::getRegPressureLimit(const TargetRegisterClass *RC,
+ MachineFunction &MF) const {
+ switch (RC->getID()) {
+ default:
+ return 0;
+ case ARM::tGPRRegClassID:
+ return RegInfo->hasFP(MF) ? 4 : 5;
+ case ARM::GPRRegClassID: {
+ unsigned FP = RegInfo->hasFP(MF) ? 1 : 0;
+ return 10 - FP - (Subtarget->isR9Reserved() ? 1 : 0);
+ }
+ case ARM::SPRRegClassID: // Currently not used as 'rep' register class.
+ case ARM::DPRRegClassID:
+ return 32 - 10;
+ }
+}
+
//===----------------------------------------------------------------------===//
// Lowering Code
//===----------------------------------------------------------------------===//
CCState &State, bool CanFail) {
static const unsigned HiRegList[] = { ARM::R0, ARM::R2 };
static const unsigned LoRegList[] = { ARM::R1, ARM::R3 };
+ static const unsigned ShadowRegList[] = { ARM::R0, ARM::R1 };
- unsigned Reg = State.AllocateReg(HiRegList, LoRegList, 2);
+ unsigned Reg = State.AllocateReg(HiRegList, ShadowRegList, 2);
if (Reg == 0) {
// For the 2nd half of a v2f64, do not just fail.
if (CanFail)
if (HiRegList[i] == Reg)
break;
+ unsigned T = State.AllocateReg(LoRegList[i]);
+ (void)T;
+ assert(T == LoRegList[i] && "Could not allocate register");
+
State.addLoc(CCValAssign::getCustomReg(ValNo, ValVT, Reg, LocVT, LocInfo));
State.addLoc(CCValAssign::getCustomReg(ValNo, ValVT, LoRegList[i],
LocVT, LocInfo));
MachineFunction &MF = DAG.getMachineFunction();
bool IsStructRet = (Outs.empty()) ? false : Outs[0].Flags.isSRet();
bool IsSibCall = false;
- // Temporarily disable tail calls so things don't break.
- if (!EnableARMTailCalls)
- isTailCall = false;
if (isTailCall) {
// Check if it's really possible to do a tail call.
isTailCall = IsEligibleForTailCallOptimization(Callee, CallConv,
DebugLoc dl = Op.getDebugLoc();
SDValue Op5 = Op.getOperand(5);
unsigned isDeviceBarrier = cast<ConstantSDNode>(Op5)->getZExtValue();
- // v6 and v7 can both handle barriers directly, but need handled a bit
- // differently. Thumb1 and pre-v6 ARM mode use a libcall instead and should
+ // Some subtargets which have dmb and dsb instructions can handle barriers
+ // directly. Some ARMv6 cpus can support them with the help of mcr
+ // instruction. Thumb1 and pre-v6 ARM mode use a libcall instead and should
// never get here.
unsigned Opc = isDeviceBarrier ? ARMISD::SYNCBARRIER : ARMISD::MEMBARRIER;
- if (Subtarget->hasV7Ops())
+ if (Subtarget->hasDataBarrier())
return DAG.getNode(Opc, dl, MVT::Other, Op.getOperand(0));
- else if (Subtarget->hasV6Ops() && !Subtarget->isThumb1Only())
+ else {
+ assert(Subtarget->hasV6Ops() && !Subtarget->isThumb1Only() &&
+ "Unexpected ISD::MEMBARRIER encountered. Should be libcall!");
return DAG.getNode(Opc, dl, MVT::Other, Op.getOperand(0),
DAG.getConstant(0, MVT::i32));
- assert(0 && "Unexpected ISD::MEMBARRIER encountered. Should be libcall!");
- return SDValue();
+ }
}
static SDValue LowerVASTART(SDValue Op, SelectionDAG &DAG) {
false, false, 0);
}
-SDValue
-ARMTargetLowering::LowerDYNAMIC_STACKALLOC(SDValue Op,
- SelectionDAG &DAG) const {
- SDNode *Node = Op.getNode();
- DebugLoc dl = Node->getDebugLoc();
- EVT VT = Node->getValueType(0);
- SDValue Chain = Op.getOperand(0);
- SDValue Size = Op.getOperand(1);
- SDValue Align = Op.getOperand(2);
-
- // Chain the dynamic stack allocation so that it doesn't modify the stack
- // pointer when other instructions are using the stack.
- Chain = DAG.getCALLSEQ_START(Chain, DAG.getIntPtrConstant(0, true));
-
- unsigned AlignVal = cast<ConstantSDNode>(Align)->getZExtValue();
- unsigned StackAlign = getTargetMachine().getFrameInfo()->getStackAlignment();
- if (AlignVal > StackAlign)
- // Do this now since selection pass cannot introduce new target
- // independent node.
- Align = DAG.getConstant(-(uint64_t)AlignVal, VT);
-
- // In Thumb1 mode, there isn't a "sub r, sp, r" instruction, we will end up
- // using a "add r, sp, r" instead. Negate the size now so we don't have to
- // do even more horrible hack later.
- MachineFunction &MF = DAG.getMachineFunction();
- ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
- if (AFI->isThumb1OnlyFunction()) {
- bool Negate = true;
- ConstantSDNode *C = dyn_cast<ConstantSDNode>(Size);
- if (C) {
- uint32_t Val = C->getZExtValue();
- if (Val <= 508 && ((Val & 3) == 0))
- Negate = false;
- }
- if (Negate)
- Size = DAG.getNode(ISD::SUB, dl, VT, DAG.getConstant(0, VT), Size);
- }
-
- SDVTList VTList = DAG.getVTList(VT, MVT::Other);
- SDValue Ops1[] = { Chain, Size, Align };
- SDValue Res = DAG.getNode(ARMISD::DYN_ALLOC, dl, VTList, Ops1, 3);
- Chain = Res.getValue(1);
- Chain = DAG.getCALLSEQ_END(Chain, DAG.getIntPtrConstant(0, true),
- DAG.getIntPtrConstant(0, true), SDValue());
- SDValue Ops2[] = { Res, Chain };
- return DAG.getMergeValues(Ops2, 2, dl);
-}
-
SDValue
ARMTargetLowering::GetF64FormalArgument(CCValAssign &VA, CCValAssign &NextVA,
SDValue &Root, SelectionDAG &DAG,
}
// Return LR, which contains the return address. Mark it an implicit live-in.
- unsigned Reg = MF.addLiveIn(ARM::LR, ARM::GPRRegisterClass);
+ unsigned Reg = MF.addLiveIn(ARM::LR, getRegClassFor(MVT::i32));
return DAG.getCopyFromReg(DAG.getEntryNode(), dl, Reg, VT);
}
return DAG.getMergeValues(Ops, 2, dl);
}
+SDValue ARMTargetLowering::LowerFLT_ROUNDS_(SDValue Op,
+ SelectionDAG &DAG) const {
+ // The rounding mode is in bits 23:22 of the FPSCR.
+ // The ARM rounding mode value to FLT_ROUNDS mapping is 0->1, 1->2, 2->3, 3->0
+ // The formula we use to implement this is (((FPSCR + 1 << 22) >> 22) & 3)
+ // so that the shift + and get folded into a bitfield extract.
+ DebugLoc dl = Op.getDebugLoc();
+ SDValue FPSCR = DAG.getNode(ISD::INTRINSIC_WO_CHAIN, dl, MVT::i32,
+ DAG.getConstant(Intrinsic::arm_get_fpscr,
+ MVT::i32));
+ SDValue FltRounds = DAG.getNode(ISD::ADD, dl, MVT::i32, FPSCR,
+ DAG.getConstant(1U << 22, MVT::i32));
+ SDValue RMODE = DAG.getNode(ISD::SRL, dl, MVT::i32, FltRounds,
+ DAG.getConstant(22, MVT::i32));
+ return DAG.getNode(ISD::AND, dl, MVT::i32, RMODE,
+ DAG.getConstant(3, MVT::i32));
+}
+
static SDValue LowerCTTZ(SDNode *N, SelectionDAG &DAG,
const ARMSubtarget *ST) {
EVT VT = N->getValueType(0);
return true;
}
+// If N is an integer constant that can be moved into a register in one
+// instruction, return an SDValue of such a constant (will become a MOV
+// instruction). Otherwise return null.
+static SDValue IsSingleInstrConstant(SDValue N, SelectionDAG &DAG,
+ const ARMSubtarget *ST, DebugLoc dl) {
+ uint64_t Val;
+ if (!isa<ConstantSDNode>(N))
+ return SDValue();
+ Val = cast<ConstantSDNode>(N)->getZExtValue();
+
+ if (ST->isThumb1Only()) {
+ if (Val <= 255 || ~Val <= 255)
+ return DAG.getConstant(Val, MVT::i32);
+ } else {
+ if (ARM_AM::getSOImmVal(Val) != -1 || ARM_AM::getSOImmVal(~Val) != -1)
+ return DAG.getConstant(Val, MVT::i32);
+ }
+ return SDValue();
+}
+
// If this is a case we can't handle, return null and let the default
// expansion code take care of it.
-static SDValue LowerBUILD_VECTOR(SDValue Op, SelectionDAG &DAG) {
+static SDValue LowerBUILD_VECTOR(SDValue Op, SelectionDAG &DAG,
+ const ARMSubtarget *ST) {
BuildVectorSDNode *BVN = cast<BuildVectorSDNode>(Op.getNode());
DebugLoc dl = Op.getDebugLoc();
EVT VT = Op.getValueType();
if (isOnlyLowElement)
return DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, VT, Value);
- // If all elements are constants, fall back to the default expansion, which
- // will generate a load from the constant pool.
+ unsigned EltSize = VT.getVectorElementType().getSizeInBits();
+
+ if (EnableARMVDUPsplat) {
+ // Use VDUP for non-constant splats. For f32 constant splats, reduce to
+ // i32 and try again.
+ if (usesOnlyOneValue && EltSize <= 32) {
+ if (!isConstant)
+ return DAG.getNode(ARMISD::VDUP, dl, VT, Value);
+ if (VT.getVectorElementType().isFloatingPoint()) {
+ SmallVector<SDValue, 8> Ops;
+ for (unsigned i = 0; i < NumElts; ++i)
+ Ops.push_back(DAG.getNode(ISD::BIT_CONVERT, dl, MVT::i32,
+ Op.getOperand(i)));
+ SDValue Val = DAG.getNode(ISD::BUILD_VECTOR, dl, MVT::v4i32, &Ops[0],
+ NumElts);
+ return DAG.getNode(ISD::BIT_CONVERT, dl, VT,
+ LowerBUILD_VECTOR(Val, DAG, ST));
+ }
+ SDValue Val = IsSingleInstrConstant(Value, DAG, ST, dl);
+ if (Val.getNode())
+ return DAG.getNode(ARMISD::VDUP, dl, VT, Val);
+ }
+ }
+
+ // If all elements are constants and the case above didn't get hit, fall back
+ // to the default expansion, which will generate a load from the constant
+ // pool.
if (isConstant)
return SDValue();
- // Use VDUP for non-constant splats.
- unsigned EltSize = VT.getVectorElementType().getSizeInBits();
- if (usesOnlyOneValue && EltSize <= 32)
- return DAG.getNode(ARMISD::VDUP, dl, VT, Value);
+ if (!EnableARMVDUPsplat) {
+ // Use VDUP for non-constant splats.
+ if (usesOnlyOneValue && EltSize <= 32)
+ return DAG.getNode(ARMISD::VDUP, dl, VT, Value);
+ }
// Vectors with 32- or 64-bit elements can be built by directly assigning
// the subregisters. Lower it to an ARMISD::BUILD_VECTOR so the operands
case ISD::SELECT_CC: return LowerSELECT_CC(Op, DAG);
case ISD::BR_CC: return LowerBR_CC(Op, DAG);
case ISD::BR_JT: return LowerBR_JT(Op, DAG);
- case ISD::DYNAMIC_STACKALLOC: return LowerDYNAMIC_STACKALLOC(Op, DAG);
case ISD::VASTART: return LowerVASTART(Op, DAG);
case ISD::MEMBARRIER: return LowerMEMBARRIER(Op, DAG, Subtarget);
case ISD::SINT_TO_FP:
case ISD::SRA_PARTS: return LowerShiftRightParts(Op, DAG);
case ISD::CTTZ: return LowerCTTZ(Op.getNode(), DAG, Subtarget);
case ISD::VSETCC: return LowerVSETCC(Op, DAG);
- case ISD::BUILD_VECTOR: return LowerBUILD_VECTOR(Op, DAG);
+ case ISD::BUILD_VECTOR: return LowerBUILD_VECTOR(Op, DAG, Subtarget);
case ISD::VECTOR_SHUFFLE: return LowerVECTOR_SHUFFLE(Op, DAG);
case ISD::EXTRACT_VECTOR_ELT: return LowerEXTRACT_VECTOR_ELT(Op, DAG);
case ISD::CONCAT_VECTORS: return LowerCONCAT_VECTORS(Op, DAG);
+ case ISD::FLT_ROUNDS_: return LowerFLT_ROUNDS_(Op, DAG);
}
return SDValue();
}
MI->eraseFromParent(); // The pseudo instruction is gone now.
return BB;
}
-
- case ARM::tANDsp:
- case ARM::tADDspr_:
- case ARM::tSUBspi_:
- case ARM::t2SUBrSPi_:
- case ARM::t2SUBrSPi12_:
- case ARM::t2SUBrSPs_: {
- MachineFunction *MF = BB->getParent();
- unsigned DstReg = MI->getOperand(0).getReg();
- unsigned SrcReg = MI->getOperand(1).getReg();
- bool DstIsDead = MI->getOperand(0).isDead();
- bool SrcIsKill = MI->getOperand(1).isKill();
-
- if (SrcReg != ARM::SP) {
- // Copy the source to SP from virtual register.
- const TargetRegisterClass *RC = MF->getRegInfo().getRegClass(SrcReg);
- unsigned CopyOpc = (RC == ARM::tGPRRegisterClass)
- ? ARM::tMOVtgpr2gpr : ARM::tMOVgpr2gpr;
- BuildMI(*BB, MI, dl, TII->get(CopyOpc), ARM::SP)
- .addReg(SrcReg, getKillRegState(SrcIsKill));
- }
-
- unsigned OpOpc = 0;
- bool NeedPred = false, NeedCC = false, NeedOp3 = false;
- switch (MI->getOpcode()) {
- default:
- llvm_unreachable("Unexpected pseudo instruction!");
- case ARM::tANDsp:
- OpOpc = ARM::tAND;
- NeedPred = true;
- break;
- case ARM::tADDspr_:
- OpOpc = ARM::tADDspr;
- break;
- case ARM::tSUBspi_:
- OpOpc = ARM::tSUBspi;
- break;
- case ARM::t2SUBrSPi_:
- OpOpc = ARM::t2SUBrSPi;
- NeedPred = true; NeedCC = true;
- break;
- case ARM::t2SUBrSPi12_:
- OpOpc = ARM::t2SUBrSPi12;
- NeedPred = true;
- break;
- case ARM::t2SUBrSPs_:
- OpOpc = ARM::t2SUBrSPs;
- NeedPred = true; NeedCC = true; NeedOp3 = true;
- break;
- }
- MachineInstrBuilder MIB = BuildMI(*BB, MI, dl, TII->get(OpOpc), ARM::SP);
- if (OpOpc == ARM::tAND)
- AddDefaultT1CC(MIB);
- MIB.addReg(ARM::SP);
- MIB.addOperand(MI->getOperand(2));
- if (NeedOp3)
- MIB.addOperand(MI->getOperand(3));
- if (NeedPred)
- AddDefaultPred(MIB);
- if (NeedCC)
- AddDefaultCC(MIB);
-
- // Copy the result from SP to virtual register.
- const TargetRegisterClass *RC = MF->getRegInfo().getRegClass(DstReg);
- unsigned CopyOpc = (RC == ARM::tGPRRegisterClass)
- ? ARM::tMOVgpr2tgpr : ARM::tMOVgpr2gpr;
- BuildMI(*BB, MI, dl, TII->get(CopyOpc))
- .addReg(DstReg, getDefRegState(true) | getDeadRegState(DstIsDead))
- .addReg(ARM::SP);
- MI->eraseFromParent(); // The pseudo instruction is gone now.
- return BB;
- }
}
}
return SDValue();
}
-/// PerformADDCombine - Target-specific dag combine xforms for ISD::ADD.
-static SDValue PerformADDCombine(SDNode *N,
- TargetLowering::DAGCombinerInfo &DCI) {
- // added by evan in r37685 with no testcase.
- SDValue N0 = N->getOperand(0), N1 = N->getOperand(1);
+/// PerformADDCombineWithOperands - Try DAG combinations for an ADD with
+/// operands N0 and N1. This is a helper for PerformADDCombine that is
+/// called with the default operands, and if that fails, with commuted
+/// operands.
+static SDValue PerformADDCombineWithOperands(SDNode *N, SDValue N0, SDValue N1,
+ TargetLowering::DAGCombinerInfo &DCI) {
+ SelectionDAG &DAG = DCI.DAG;
// fold (add (select cc, 0, c), x) -> (select cc, x, (add, x, c))
if (N0.getOpcode() == ISD::SELECT && N0.getNode()->hasOneUse()) {
SDValue Result = combineSelectAndUse(N, N0, N1, DCI);
if (Result.getNode()) return Result;
}
- if (N1.getOpcode() == ISD::SELECT && N1.getNode()->hasOneUse()) {
- SDValue Result = combineSelectAndUse(N, N1, N0, DCI);
- if (Result.getNode()) return Result;
+
+ // fold (add (arm_neon_vabd a, b) c) -> (arm_neon_vaba c, a, b)
+ EVT VT = N->getValueType(0);
+ if (N0.getOpcode() == ISD::INTRINSIC_WO_CHAIN && VT.isInteger()) {
+ unsigned IntNo = cast<ConstantSDNode>(N0.getOperand(0))->getZExtValue();
+ if (IntNo == Intrinsic::arm_neon_vabds)
+ return DAG.getNode(ISD::INTRINSIC_WO_CHAIN, N->getDebugLoc(), VT,
+ DAG.getConstant(Intrinsic::arm_neon_vabas, MVT::i32),
+ N1, N0.getOperand(1), N0.getOperand(2));
+ if (IntNo == Intrinsic::arm_neon_vabdu)
+ return DAG.getNode(ISD::INTRINSIC_WO_CHAIN, N->getDebugLoc(), VT,
+ DAG.getConstant(Intrinsic::arm_neon_vabau, MVT::i32),
+ N1, N0.getOperand(1), N0.getOperand(2));
}
return SDValue();
}
+/// PerformADDCombine - Target-specific dag combine xforms for ISD::ADD.
+///
+static SDValue PerformADDCombine(SDNode *N,
+ TargetLowering::DAGCombinerInfo &DCI) {
+ SDValue N0 = N->getOperand(0);
+ SDValue N1 = N->getOperand(1);
+
+ // First try with the default operand order.
+ SDValue Result = PerformADDCombineWithOperands(N, N0, N1, DCI);
+ if (Result.getNode())
+ return Result;
+
+ // If that didn't work, try again with the operands commuted.
+ return PerformADDCombineWithOperands(N, N1, N0, DCI);
+}
+
/// PerformSUBCombine - Target-specific dag combine xforms for ISD::SUB.
+///
static SDValue PerformSUBCombine(SDNode *N,
TargetLowering::DAGCombinerInfo &DCI) {
- // added by evan in r37685 with no testcase.
- SDValue N0 = N->getOperand(0), N1 = N->getOperand(1);
+ SDValue N0 = N->getOperand(0);
+ SDValue N1 = N->getOperand(1);
// fold (sub x, (select cc, 0, c)) -> (select cc, x, (sub, x, c))
if (N1.getOpcode() == ISD::SELECT && N1.getNode()->hasOneUse()) {
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