//
//===----------------------------------------------------------------------===//
-#define DEBUG_TYPE "hexagon-isel"
+#include "Hexagon.h"
#include "HexagonISelLowering.h"
#include "HexagonTargetMachine.h"
-#include "llvm/Intrinsics.h"
+#include "llvm/ADT/DenseMap.h"
#include "llvm/CodeGen/SelectionDAGISel.h"
+#include "llvm/IR/Intrinsics.h"
+#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/Debug.h"
-
using namespace llvm;
+#define DEBUG_TYPE "hexagon-isel"
+
+static
+cl::opt<unsigned>
+MaxNumOfUsesForConstExtenders("ga-max-num-uses-for-constant-extenders",
+ cl::Hidden, cl::init(2),
+ cl::desc("Maximum number of uses of a global address such that we still us a"
+ "constant extended instruction"));
//===----------------------------------------------------------------------===//
// Instruction Selector Implementation
//===----------------------------------------------------------------------===//
+namespace llvm {
+ void initializeHexagonDAGToDAGISelPass(PassRegistry&);
+}
+
//===--------------------------------------------------------------------===//
/// HexagonDAGToDAGISel - Hexagon specific code to select Hexagon machine
/// instructions for SelectionDAG operations.
const HexagonSubtarget &Subtarget;
// Keep a reference to HexagonTargetMachine.
- HexagonTargetMachine& TM;
- const HexagonInstrInfo *TII;
-
+ const HexagonTargetMachine& TM;
+ DenseMap<const GlobalValue *, unsigned> GlobalAddressUseCountMap;
public:
- explicit HexagonDAGToDAGISel(HexagonTargetMachine &targetmachine)
- : SelectionDAGISel(targetmachine),
+ explicit HexagonDAGToDAGISel(HexagonTargetMachine &targetmachine,
+ CodeGenOpt::Level OptLevel)
+ : SelectionDAGISel(targetmachine, OptLevel),
Subtarget(targetmachine.getSubtarget<HexagonSubtarget>()),
- TM(targetmachine),
- TII(static_cast<const HexagonInstrInfo*>(TM.getInstrInfo())) {
-
+ TM(targetmachine) {
+ initializeHexagonDAGToDAGISelPass(*PassRegistry::getPassRegistry());
}
+ bool hasNumUsesBelowThresGA(SDNode *N) const;
SDNode *Select(SDNode *N);
// Complex Pattern Selectors.
+ inline bool foldGlobalAddress(SDValue &N, SDValue &R);
+ inline bool foldGlobalAddressGP(SDValue &N, SDValue &R);
+ bool foldGlobalAddressImpl(SDValue &N, SDValue &R, bool ShouldLookForGP);
bool SelectADDRri(SDValue& N, SDValue &R1, SDValue &R2);
bool SelectADDRriS11_0(SDValue& N, SDValue &R1, SDValue &R2);
bool SelectADDRriS11_1(SDValue& N, SDValue &R1, SDValue &R2);
bool SelectAddr(SDNode *Op, SDValue Addr, SDValue &Base, SDValue &Offset);
SDNode *SelectLoad(SDNode *N);
- SDNode *SelectBaseOffsetLoad(LoadSDNode *LD, DebugLoc dl);
- SDNode *SelectIndexedLoad(LoadSDNode *LD, DebugLoc dl);
+ SDNode *SelectBaseOffsetLoad(LoadSDNode *LD, SDLoc dl);
+ SDNode *SelectIndexedLoad(LoadSDNode *LD, SDLoc dl);
SDNode *SelectIndexedLoadZeroExtend64(LoadSDNode *LD, unsigned Opcode,
- DebugLoc dl);
+ SDLoc dl);
SDNode *SelectIndexedLoadSignExtend64(LoadSDNode *LD, unsigned Opcode,
- DebugLoc dl);
- SDNode *SelectBaseOffsetStore(StoreSDNode *ST, DebugLoc dl);
- SDNode *SelectIndexedStore(StoreSDNode *ST, DebugLoc dl);
+ SDLoc dl);
+ SDNode *SelectBaseOffsetStore(StoreSDNode *ST, SDLoc dl);
+ SDNode *SelectIndexedStore(StoreSDNode *ST, SDLoc dl);
SDNode *SelectStore(SDNode *N);
SDNode *SelectSHL(SDNode *N);
SDNode *SelectSelect(SDNode *N);
SDNode *SelectMul(SDNode *N);
SDNode *SelectZeroExtend(SDNode *N);
SDNode *SelectIntrinsicWOChain(SDNode *N);
+ SDNode *SelectIntrinsicWChain(SDNode *N);
SDNode *SelectConstant(SDNode *N);
+ SDNode *SelectConstantFP(SDNode *N);
SDNode *SelectAdd(SDNode *N);
+ bool isConstExtProfitable(SDNode *N) const;
+
+// XformMskToBitPosU5Imm - Returns the bit position which
+// the single bit 32 bit mask represents.
+// Used in Clr and Set bit immediate memops.
+SDValue XformMskToBitPosU5Imm(uint32_t Imm) {
+ int32_t bitPos;
+ bitPos = Log2_32(Imm);
+ assert(bitPos >= 0 && bitPos < 32 &&
+ "Constant out of range for 32 BitPos Memops");
+ return CurDAG->getTargetConstant(bitPos, MVT::i32);
+}
- // Include the pieces autogenerated from the target description.
+// XformMskToBitPosU4Imm - Returns the bit position which the single bit 16 bit
+// mask represents. Used in Clr and Set bit immediate memops.
+SDValue XformMskToBitPosU4Imm(uint16_t Imm) {
+ return XformMskToBitPosU5Imm(Imm);
+}
+
+// XformMskToBitPosU3Imm - Returns the bit position which the single bit 8 bit
+// mask represents. Used in Clr and Set bit immediate memops.
+SDValue XformMskToBitPosU3Imm(uint8_t Imm) {
+ return XformMskToBitPosU5Imm(Imm);
+}
+
+// Return true if there is exactly one bit set in V, i.e., if V is one of the
+// following integers: 2^0, 2^1, ..., 2^31.
+bool ImmIsSingleBit(uint32_t v) const {
+ uint32_t c = CountPopulation_64(v);
+ // Only return true if we counted 1 bit.
+ return c == 1;
+}
+
+// XformM5ToU5Imm - Return a target constant with the specified value, of type
+// i32 where the negative literal is transformed into a positive literal for
+// use in -= memops.
+inline SDValue XformM5ToU5Imm(signed Imm) {
+ assert( (Imm >= -31 && Imm <= -1) && "Constant out of range for Memops");
+ return CurDAG->getTargetConstant( - Imm, MVT::i32);
+}
+
+
+// XformU7ToU7M1Imm - Return a target constant decremented by 1, in range
+// [1..128], used in cmpb.gtu instructions.
+inline SDValue XformU7ToU7M1Imm(signed Imm) {
+ assert((Imm >= 1 && Imm <= 128) && "Constant out of range for cmpb op");
+ return CurDAG->getTargetConstant(Imm - 1, MVT::i8);
+}
+
+// XformS8ToS8M1Imm - Return a target constant decremented by 1.
+inline SDValue XformSToSM1Imm(signed Imm) {
+ return CurDAG->getTargetConstant(Imm - 1, MVT::i32);
+}
+
+// XformU8ToU8M1Imm - Return a target constant decremented by 1.
+inline SDValue XformUToUM1Imm(unsigned Imm) {
+ assert((Imm >= 1) && "Cannot decrement unsigned int less than 1");
+ return CurDAG->getTargetConstant(Imm - 1, MVT::i32);
+}
+
+// Include the pieces autogenerated from the target description.
#include "HexagonGenDAGISel.inc"
};
} // end anonymous namespace
/// createHexagonISelDag - This pass converts a legalized DAG into a
/// Hexagon-specific DAG, ready for instruction scheduling.
///
-FunctionPass *llvm::createHexagonISelDag(HexagonTargetMachine &TM) {
- return new HexagonDAGToDAGISel(TM);
+FunctionPass *llvm::createHexagonISelDag(HexagonTargetMachine &TM,
+ CodeGenOpt::Level OptLevel) {
+ return new HexagonDAGToDAGISel(TM, OptLevel);
+}
+
+static void initializePassOnce(PassRegistry &Registry) {
+ const char *Name = "Hexagon DAG->DAG Pattern Instruction Selection";
+ PassInfo *PI = new PassInfo(Name, "hexagon-isel",
+ &SelectionDAGISel::ID, nullptr, false, false);
+ Registry.registerPass(*PI, true);
+}
+
+void llvm::initializeHexagonDAGToDAGISelPass(PassRegistry &Registry) {
+ CALL_ONCE_INITIALIZATION(initializePassOnce)
}
+
static bool IsS11_0_Offset(SDNode * S) {
ConstantSDNode *N = cast<ConstantSDNode>(S);
// lowering for GlobalAddress nodes has already turned it into a
// CONST32.
//
-SDNode *HexagonDAGToDAGISel::SelectBaseOffsetLoad(LoadSDNode *LD, DebugLoc dl) {
+SDNode *HexagonDAGToDAGISel::SelectBaseOffsetLoad(LoadSDNode *LD, SDLoc dl) {
SDValue Chain = LD->getChain();
SDNode* Const32 = LD->getBasePtr().getNode();
unsigned Opcode = 0;
EVT LoadedVT = LD->getMemoryVT();
int64_t Offset = cast<GlobalAddressSDNode>(Base)->getOffset();
if (Offset != 0 && OffsetFitsS11(LoadedVT, Offset)) {
- MVT PointerTy = TLI.getPointerTy();
+ MVT PointerTy = getTargetLowering()->getPointerTy();
const GlobalValue* GV =
cast<GlobalAddressSDNode>(Base)->getGlobal();
SDValue TargAddr =
else if (LoadedVT == MVT::i32) Opcode = Hexagon::LDriw_indexed;
else if (LoadedVT == MVT::i16) Opcode = Hexagon::LDrih_indexed;
else if (LoadedVT == MVT::i8) Opcode = Hexagon::LDrib_indexed;
- else assert (0 && "unknown memory type");
+ else llvm_unreachable("unknown memory type");
// Build indexed load.
SDValue TargetConstOff = CurDAG->getTargetConstant(Offset, PointerTy);
SDNode *HexagonDAGToDAGISel::SelectIndexedLoadSignExtend64(LoadSDNode *LD,
unsigned Opcode,
- DebugLoc dl)
+ SDLoc dl)
{
SDValue Chain = LD->getChain();
EVT LoadedVT = LD->getMemoryVT();
SDValue N1 = LD->getOperand(1);
SDValue CPTmpN1_0;
SDValue CPTmpN1_1;
+
if (SelectADDRriS11_2(N1, CPTmpN1_0, CPTmpN1_1) &&
N1.getNode()->getValueType(0) == MVT::i32) {
+ const HexagonInstrInfo *TII =
+ static_cast<const HexagonInstrInfo*>(TM.getInstrInfo());
if (TII->isValidAutoIncImm(LoadedVT, Val)) {
SDValue TargetConst = CurDAG->getTargetConstant(Val, MVT::i32);
SDNode *Result_1 = CurDAG->getMachineNode(Opcode, dl, MVT::i32, MVT::i32,
SDNode *HexagonDAGToDAGISel::SelectIndexedLoadZeroExtend64(LoadSDNode *LD,
unsigned Opcode,
- DebugLoc dl)
+ SDLoc dl)
{
SDValue Chain = LD->getChain();
EVT LoadedVT = LD->getMemoryVT();
SDValue N1 = LD->getOperand(1);
SDValue CPTmpN1_0;
SDValue CPTmpN1_1;
+
if (SelectADDRriS11_2(N1, CPTmpN1_0, CPTmpN1_1) &&
N1.getNode()->getValueType(0) == MVT::i32) {
+ const HexagonInstrInfo *TII =
+ static_cast<const HexagonInstrInfo*>(TM.getInstrInfo());
if (TII->isValidAutoIncImm(LoadedVT, Val)) {
SDValue TargetConstVal = CurDAG->getTargetConstant(Val, MVT::i32);
SDValue TargetConst0 = CurDAG->getTargetConstant(0, MVT::i32);
}
-SDNode *HexagonDAGToDAGISel::SelectIndexedLoad(LoadSDNode *LD, DebugLoc dl) {
+SDNode *HexagonDAGToDAGISel::SelectIndexedLoad(LoadSDNode *LD, SDLoc dl) {
SDValue Chain = LD->getChain();
SDValue Base = LD->getBasePtr();
SDValue Offset = LD->getOffset();
bool zextval = (LD->getExtensionType() == ISD::ZEXTLOAD);
// Figure out the opcode.
+ const HexagonInstrInfo *TII =
+ static_cast<const HexagonInstrInfo*>(TM.getInstrInfo());
if (LoadedVT == MVT::i64) {
if (TII->isValidAutoIncImm(LoadedVT, Val))
Opcode = Hexagon::POST_LDrid;
else
Opcode = zextval ? Hexagon::LDriub : Hexagon::LDrib;
} else
- assert (0 && "unknown memory type");
+ llvm_unreachable("unknown memory type");
// For zero ext i64 loads, we need to add combine instructions.
if (LD->getValueType(0) == MVT::i64 &&
SDNode *HexagonDAGToDAGISel::SelectLoad(SDNode *N) {
SDNode *result;
- DebugLoc dl = N->getDebugLoc();
+ SDLoc dl(N);
LoadSDNode *LD = cast<LoadSDNode>(N);
ISD::MemIndexedMode AM = LD->getAddressingMode();
}
-SDNode *HexagonDAGToDAGISel::SelectIndexedStore(StoreSDNode *ST, DebugLoc dl) {
+SDNode *HexagonDAGToDAGISel::SelectIndexedStore(StoreSDNode *ST, SDLoc dl) {
SDValue Chain = ST->getChain();
SDValue Base = ST->getBasePtr();
SDValue Offset = ST->getOffset();
// Offset value must be within representable range
// and must have correct alignment properties.
+ const HexagonInstrInfo *TII =
+ static_cast<const HexagonInstrInfo*>(TM.getInstrInfo());
if (TII->isValidAutoIncImm(StoredVT, Val)) {
- SDValue Ops[] = { Value, Base,
- CurDAG->getTargetConstant(Val, MVT::i32), Chain};
+ SDValue Ops[] = {Base, CurDAG->getTargetConstant(Val, MVT::i32), Value,
+ Chain};
unsigned Opcode = 0;
// Figure out the post inc version of opcode.
else if (StoredVT == MVT::i32) Opcode = Hexagon::POST_STwri;
else if (StoredVT == MVT::i16) Opcode = Hexagon::POST_SThri;
else if (StoredVT == MVT::i8) Opcode = Hexagon::POST_STbri;
- else assert (0 && "unknown memory type");
+ else llvm_unreachable("unknown memory type");
// Build post increment store.
SDNode* Result = CurDAG->getMachineNode(Opcode, dl, MVT::i32,
- MVT::Other, Ops, 4);
+ MVT::Other, Ops);
MachineSDNode::mmo_iterator MemOp = MF->allocateMemRefsArray(1);
MemOp[0] = ST->getMemOperand();
cast<MachineSDNode>(Result)->setMemRefs(MemOp, MemOp + 1);
// Figure out the opcode.
if (StoredVT == MVT::i64) Opcode = Hexagon::STrid;
- else if (StoredVT == MVT::i32) Opcode = Hexagon::STriw;
+ else if (StoredVT == MVT::i32) Opcode = Hexagon::STriw_indexed;
else if (StoredVT == MVT::i16) Opcode = Hexagon::STrih;
else if (StoredVT == MVT::i8) Opcode = Hexagon::STrib;
- else assert (0 && "unknown memory type");
+ else llvm_unreachable("unknown memory type");
// Build regular store.
SDValue TargetConstVal = CurDAG->getTargetConstant(Val, MVT::i32);
- SDNode* Result_1 = CurDAG->getMachineNode(Opcode, dl, MVT::Other, Ops,
- 4);
+ SDNode* Result_1 = CurDAG->getMachineNode(Opcode, dl, MVT::Other, Ops);
// Build splitted incriment instruction.
SDNode* Result_2 = CurDAG->getMachineNode(Hexagon::ADD_ri, dl, MVT::i32,
Base,
SDNode *HexagonDAGToDAGISel::SelectBaseOffsetStore(StoreSDNode *ST,
- DebugLoc dl) {
+ SDLoc dl) {
SDValue Chain = ST->getChain();
SDNode* Const32 = ST->getBasePtr().getNode();
SDValue Value = ST->getValue();
EVT StoredVT = ST->getMemoryVT();
int64_t Offset = cast<GlobalAddressSDNode>(Base)->getOffset();
if (Offset != 0 && OffsetFitsS11(StoredVT, Offset)) {
- MVT PointerTy = TLI.getPointerTy();
+ MVT PointerTy = getTargetLowering()->getPointerTy();
const GlobalValue* GV =
cast<GlobalAddressSDNode>(Base)->getGlobal();
SDValue TargAddr =
else if (StoredVT == MVT::i32) Opcode = Hexagon::STriw_indexed;
else if (StoredVT == MVT::i16) Opcode = Hexagon::STrih_indexed;
else if (StoredVT == MVT::i8) Opcode = Hexagon::STrib_indexed;
- else assert (0 && "unknown memory type");
+ else llvm_unreachable("unknown memory type");
SDValue Ops[] = {SDValue(NewBase,0),
CurDAG->getTargetConstant(Offset,PointerTy),
Value, Chain};
// build indexed store
SDNode* Result = CurDAG->getMachineNode(Opcode, dl,
- MVT::Other, Ops, 4);
+ MVT::Other, Ops);
MachineSDNode::mmo_iterator MemOp = MF->allocateMemRefsArray(1);
MemOp[0] = ST->getMemOperand();
cast<MachineSDNode>(Result)->setMemRefs(MemOp, MemOp + 1);
SDNode *HexagonDAGToDAGISel::SelectStore(SDNode *N) {
- DebugLoc dl = N->getDebugLoc();
+ SDLoc dl(N);
StoreSDNode *ST = cast<StoreSDNode>(N);
ISD::MemIndexedMode AM = ST->getAddressingMode();
}
SDNode *HexagonDAGToDAGISel::SelectMul(SDNode *N) {
- DebugLoc dl = N->getDebugLoc();
+ SDLoc dl(N);
//
// %conv.i = sext i32 %tmp1 to i64
if (MulOp0.getOpcode() == ISD::SIGN_EXTEND) {
SDValue Sext0 = MulOp0.getOperand(0);
if (Sext0.getNode()->getValueType(0) != MVT::i32) {
- SelectCode(N);
+ return SelectCode(N);
}
OP0 = Sext0;
if (LD->getMemoryVT() != MVT::i32 ||
LD->getExtensionType() != ISD::SEXTLOAD ||
LD->getAddressingMode() != ISD::UNINDEXED) {
- SelectCode(N);
+ return SelectCode(N);
}
SDValue Chain = LD->getChain();
SDNode *HexagonDAGToDAGISel::SelectSelect(SDNode *N) {
- DebugLoc dl = N->getDebugLoc();
+ SDLoc dl(N);
SDValue N0 = N->getOperand(0);
if (N0.getOpcode() == ISD::SETCC) {
SDValue N00 = N0.getOperand(0);
SDNode *HexagonDAGToDAGISel::SelectTruncate(SDNode *N) {
- DebugLoc dl = N->getDebugLoc();
+ SDLoc dl(N);
SDValue Shift = N->getOperand(0);
//
SDNode *HexagonDAGToDAGISel::SelectSHL(SDNode *N) {
- DebugLoc dl = N->getDebugLoc();
+ SDLoc dl(N);
if (N->getValueType(0) == MVT::i32) {
SDValue Shl_0 = N->getOperand(0);
SDValue Shl_1 = N->getOperand(1);
// We want to preserve all the lower 8-bits and, not just 1 LSB bit.
//
SDNode *HexagonDAGToDAGISel::SelectZeroExtend(SDNode *N) {
- DebugLoc dl = N->getDebugLoc();
+ SDLoc dl(N);
SDNode *IsIntrinsic = N->getOperand(0).getNode();
if ((IsIntrinsic->getOpcode() == ISD::INTRINSIC_WO_CHAIN)) {
unsigned ID =
// and lowering to the actual intrinsic.
//
SDNode *HexagonDAGToDAGISel::SelectIntrinsicWOChain(SDNode *N) {
- DebugLoc dl = N->getDebugLoc();
+ SDLoc dl(N);
unsigned ID = cast<ConstantSDNode>(N->getOperand(0))->getZExtValue();
unsigned IntrinsicWithPred = doesIntrinsicContainPredicate(ID);
// as at least one of the operands.
if (IntrinsicWithPred) {
SmallVector<SDValue, 8> Ops;
+ const HexagonInstrInfo *TII =
+ static_cast<const HexagonInstrInfo*>(TM.getInstrInfo());
const MCInstrDesc &MCID = TII->get(IntrinsicWithPred);
const TargetRegisterInfo *TRI = TM.getRegisterInfo();
// For immediates, lower it.
for (unsigned i = 1; i < N->getNumOperands(); ++i) {
SDNode *Arg = N->getOperand(i).getNode();
- const TargetRegisterClass *RC = TII->getRegClass(MCID, i, TRI);
+ const TargetRegisterClass *RC = TII->getRegClass(MCID, i, TRI, *MF);
if (RC == &Hexagon::IntRegsRegClass ||
RC == &Hexagon::DoubleRegsRegClass) {
SDNode *PdRs = CurDAG->getMachineNode(Hexagon::TFR_PdRs, dl, MVT::i1,
SDValue(Arg, 0));
Ops.push_back(SDValue(PdRs,0));
- } else if (RC == NULL && (dyn_cast<ConstantSDNode>(Arg) != NULL)) {
+ } else if (!RC && (dyn_cast<ConstantSDNode>(Arg) != nullptr)) {
// This is immediate operand. Lower it here making sure that we DO have
// const SDNode for immediate value.
int32_t Val = cast<ConstantSDNode>(Arg)->getSExtValue();
}
EVT ReturnValueVT = N->getValueType(0);
SDNode *Result = CurDAG->getMachineNode(IntrinsicWithPred, dl,
- ReturnValueVT,
- Ops.data(), Ops.size());
+ ReturnValueVT, Ops);
ReplaceUses(N, Result);
return Result;
}
return SelectCode(N);
}
+//
+// Map floating point constant values.
+//
+SDNode *HexagonDAGToDAGISel::SelectConstantFP(SDNode *N) {
+ SDLoc dl(N);
+ ConstantFPSDNode *CN = dyn_cast<ConstantFPSDNode>(N);
+ APFloat APF = CN->getValueAPF();
+ if (N->getValueType(0) == MVT::f32) {
+ return CurDAG->getMachineNode(Hexagon::TFRI_f, dl, MVT::f32,
+ CurDAG->getTargetConstantFP(APF.convertToFloat(), MVT::f32));
+ }
+ else if (N->getValueType(0) == MVT::f64) {
+ return CurDAG->getMachineNode(Hexagon::CONST64_Float_Real, dl, MVT::f64,
+ CurDAG->getTargetConstantFP(APF.convertToDouble(), MVT::f64));
+ }
+
+ return SelectCode(N);
+}
+
//
// Map predicate true (encoded as -1 in LLVM) to a XOR.
//
SDNode *HexagonDAGToDAGISel::SelectConstant(SDNode *N) {
- DebugLoc dl = N->getDebugLoc();
+ SDLoc dl(N);
if (N->getValueType(0) == MVT::i1) {
SDNode* Result;
int32_t Val = cast<ConstantSDNode>(N)->getSExtValue();
// Map add followed by a asr -> asr +=.
//
SDNode *HexagonDAGToDAGISel::SelectAdd(SDNode *N) {
- DebugLoc dl = N->getDebugLoc();
+ SDLoc dl(N);
if (N->getValueType(0) != MVT::i32) {
return SelectCode(N);
}
SDNode *HexagonDAGToDAGISel::Select(SDNode *N) {
- if (N->isMachineOpcode())
- return NULL; // Already selected.
+ if (N->isMachineOpcode()) {
+ N->setNodeId(-1);
+ return nullptr; // Already selected.
+ }
switch (N->getOpcode()) {
case ISD::Constant:
return SelectConstant(N);
+ case ISD::ConstantFP:
+ return SelectConstantFP(N);
+
case ISD::ADD:
return SelectAdd(N);
OutOps.push_back(Op1);
return false;
}
+
+bool HexagonDAGToDAGISel::isConstExtProfitable(SDNode *N) const {
+ unsigned UseCount = 0;
+ for (SDNode::use_iterator I = N->use_begin(), E = N->use_end(); I != E; ++I) {
+ UseCount++;
+ }
+
+ return (UseCount <= 1);
+
+}
+
+//===--------------------------------------------------------------------===//
+// Return 'true' if use count of the global address is below threshold.
+//===--------------------------------------------------------------------===//
+bool HexagonDAGToDAGISel::hasNumUsesBelowThresGA(SDNode *N) const {
+ assert(N->getOpcode() == ISD::TargetGlobalAddress &&
+ "Expecting a target global address");
+
+ // Always try to fold the address.
+ if (TM.getOptLevel() == CodeGenOpt::Aggressive)
+ return true;
+
+ GlobalAddressSDNode *GA = cast<GlobalAddressSDNode>(N);
+ DenseMap<const GlobalValue *, unsigned>::const_iterator GI =
+ GlobalAddressUseCountMap.find(GA->getGlobal());
+
+ if (GI == GlobalAddressUseCountMap.end())
+ return false;
+
+ return GI->second <= MaxNumOfUsesForConstExtenders;
+}
+
+//===--------------------------------------------------------------------===//
+// Return true if the non-GP-relative global address can be folded.
+//===--------------------------------------------------------------------===//
+inline bool HexagonDAGToDAGISel::foldGlobalAddress(SDValue &N, SDValue &R) {
+ return foldGlobalAddressImpl(N, R, false);
+}
+
+//===--------------------------------------------------------------------===//
+// Return true if the GP-relative global address can be folded.
+//===--------------------------------------------------------------------===//
+inline bool HexagonDAGToDAGISel::foldGlobalAddressGP(SDValue &N, SDValue &R) {
+ return foldGlobalAddressImpl(N, R, true);
+}
+
+//===--------------------------------------------------------------------===//
+// Fold offset of the global address if number of uses are below threshold.
+//===--------------------------------------------------------------------===//
+bool HexagonDAGToDAGISel::foldGlobalAddressImpl(SDValue &N, SDValue &R,
+ bool ShouldLookForGP) {
+ if (N.getOpcode() == ISD::ADD) {
+ SDValue N0 = N.getOperand(0);
+ SDValue N1 = N.getOperand(1);
+ if ((ShouldLookForGP && (N0.getOpcode() == HexagonISD::CONST32_GP)) ||
+ (!ShouldLookForGP && (N0.getOpcode() == HexagonISD::CONST32))) {
+ ConstantSDNode *Const = dyn_cast<ConstantSDNode>(N1);
+ GlobalAddressSDNode *GA =
+ dyn_cast<GlobalAddressSDNode>(N0.getOperand(0));
+
+ if (Const && GA &&
+ (GA->getOpcode() == ISD::TargetGlobalAddress)) {
+ if ((N0.getOpcode() == HexagonISD::CONST32) &&
+ !hasNumUsesBelowThresGA(GA))
+ return false;
+ R = CurDAG->getTargetGlobalAddress(GA->getGlobal(),
+ SDLoc(Const),
+ N.getValueType(),
+ GA->getOffset() +
+ (uint64_t)Const->getSExtValue());
+ return true;
+ }
+ }
+ }
+ return false;
+}
projects / oota-llvm.git / blobdiff