-///===-- FastISel.cpp - Implementation of the FastISel class --------------===//
+//===-- FastISel.cpp - Implementation of the FastISel class ---------------===//
//
// The LLVM Compiler Infrastructure
//
//
//===----------------------------------------------------------------------===//
+#define DEBUG_TYPE "isel"
#include "llvm/Function.h"
#include "llvm/GlobalVariable.h"
#include "llvm/Instructions.h"
#include "llvm/IntrinsicInst.h"
+#include "llvm/Operator.h"
+#include "llvm/CodeGen/Analysis.h"
#include "llvm/CodeGen/FastISel.h"
+#include "llvm/CodeGen/FunctionLoweringInfo.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
-#include "llvm/CodeGen/DwarfWriter.h"
#include "llvm/Analysis/DebugInfo.h"
+#include "llvm/Analysis/Loads.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Target/TargetLowering.h"
#include "llvm/Target/TargetMachine.h"
-#include "SelectionDAGBuild.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/ADT/Statistic.h"
using namespace llvm;
-unsigned FastISel::getRegForValue(Value *V) {
- MVT RealVT = TLI.getValueType(V->getType(), /*AllowUnknown=*/true);
+STATISTIC(NumFastIselSuccessIndependent, "Number of insts selected by "
+ "target-independent selector");
+STATISTIC(NumFastIselSuccessTarget, "Number of insts selected by "
+ "target-specific selector");
+STATISTIC(NumFastIselDead, "Number of dead insts removed on failure");
+
+/// startNewBlock - Set the current block to which generated machine
+/// instructions will be appended, and clear the local CSE map.
+///
+void FastISel::startNewBlock() {
+ LocalValueMap.clear();
+
+ EmitStartPt = 0;
+
+ // Advance the emit start point past any EH_LABEL instructions.
+ MachineBasicBlock::iterator
+ I = FuncInfo.MBB->begin(), E = FuncInfo.MBB->end();
+ while (I != E && I->getOpcode() == TargetOpcode::EH_LABEL) {
+ EmitStartPt = I;
+ ++I;
+ }
+ LastLocalValue = EmitStartPt;
+}
+
+void FastISel::flushLocalValueMap() {
+ LocalValueMap.clear();
+ LastLocalValue = EmitStartPt;
+ recomputeInsertPt();
+}
+
+bool FastISel::hasTrivialKill(const Value *V) const {
+ // Don't consider constants or arguments to have trivial kills.
+ const Instruction *I = dyn_cast<Instruction>(V);
+ if (!I)
+ return false;
+
+ // No-op casts are trivially coalesced by fast-isel.
+ if (const CastInst *Cast = dyn_cast<CastInst>(I))
+ if (Cast->isNoopCast(TD.getIntPtrType(Cast->getContext())) &&
+ !hasTrivialKill(Cast->getOperand(0)))
+ return false;
+
+ // GEPs with all zero indices are trivially coalesced by fast-isel.
+ if (const GetElementPtrInst *GEP = dyn_cast<GetElementPtrInst>(I))
+ if (GEP->hasAllZeroIndices() && !hasTrivialKill(GEP->getOperand(0)))
+ return false;
+
+ // Only instructions with a single use in the same basic block are considered
+ // to have trivial kills.
+ return I->hasOneUse() &&
+ !(I->getOpcode() == Instruction::BitCast ||
+ I->getOpcode() == Instruction::PtrToInt ||
+ I->getOpcode() == Instruction::IntToPtr) &&
+ cast<Instruction>(*I->use_begin())->getParent() == I->getParent();
+}
+
+unsigned FastISel::getRegForValue(const Value *V) {
+ EVT RealVT = TLI.getValueType(V->getType(), /*AllowUnknown=*/true);
// Don't handle non-simple values in FastISel.
if (!RealVT.isSimple())
return 0;
// Ignore illegal types. We must do this before looking up the value
// in ValueMap because Arguments are given virtual registers regardless
// of whether FastISel can handle them.
- MVT::SimpleValueType VT = RealVT.getSimpleVT();
+ MVT VT = RealVT.getSimpleVT();
if (!TLI.isTypeLegal(VT)) {
- // Promote MVT::i1 to a legal type though, because it's common and easy.
- if (VT == MVT::i1)
- VT = TLI.getTypeToTransformTo(VT).getSimpleVT();
+ // Handle integer promotions, though, because they're common and easy.
+ if (VT == MVT::i1 || VT == MVT::i8 || VT == MVT::i16)
+ VT = TLI.getTypeToTransformTo(V->getContext(), VT).getSimpleVT();
else
return 0;
}
- // Look up the value to see if we already have a register for it. We
- // cache values defined by Instructions across blocks, and other values
- // only locally. This is because Instructions already have the SSA
- // def-dominatess-use requirement enforced.
- if (ValueMap.count(V))
- return ValueMap[V];
- unsigned Reg = LocalValueMap[V];
+ // Look up the value to see if we already have a register for it.
+ unsigned Reg = lookUpRegForValue(V);
if (Reg != 0)
return Reg;
- if (ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
+ // In bottom-up mode, just create the virtual register which will be used
+ // to hold the value. It will be materialized later.
+ if (isa<Instruction>(V) &&
+ (!isa<AllocaInst>(V) ||
+ !FuncInfo.StaticAllocaMap.count(cast<AllocaInst>(V))))
+ return FuncInfo.InitializeRegForValue(V);
+
+ SavePoint SaveInsertPt = enterLocalValueArea();
+
+ // Materialize the value in a register. Emit any instructions in the
+ // local value area.
+ Reg = materializeRegForValue(V, VT);
+
+ leaveLocalValueArea(SaveInsertPt);
+
+ return Reg;
+}
+
+/// materializeRegForValue - Helper for getRegForValue. This function is
+/// called when the value isn't already available in a register and must
+/// be materialized with new instructions.
+unsigned FastISel::materializeRegForValue(const Value *V, MVT VT) {
+ unsigned Reg = 0;
+
+ if (const ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
if (CI->getValue().getActiveBits() <= 64)
Reg = FastEmit_i(VT, VT, ISD::Constant, CI->getZExtValue());
} else if (isa<AllocaInst>(V)) {
} else if (isa<ConstantPointerNull>(V)) {
// Translate this as an integer zero so that it can be
// local-CSE'd with actual integer zeros.
- Reg = getRegForValue(Context->getNullValue(TD.getIntPtrType()));
- } else if (ConstantFP *CF = dyn_cast<ConstantFP>(V)) {
- Reg = FastEmit_f(VT, VT, ISD::ConstantFP, CF);
+ Reg =
+ getRegForValue(Constant::getNullValue(TD.getIntPtrType(V->getContext())));
+ } else if (const ConstantFP *CF = dyn_cast<ConstantFP>(V)) {
+ if (CF->isNullValue()) {
+ Reg = TargetMaterializeFloatZero(CF);
+ } else {
+ // Try to emit the constant directly.
+ Reg = FastEmit_f(VT, VT, ISD::ConstantFP, CF);
+ }
if (!Reg) {
+ // Try to emit the constant by using an integer constant with a cast.
const APFloat &Flt = CF->getValueAPF();
- MVT IntVT = TLI.getPointerTy();
+ EVT IntVT = TLI.getPointerTy();
uint64_t x[2];
uint32_t IntBitWidth = IntVT.getSizeInBits();
bool isExact;
(void) Flt.convertToInteger(x, IntBitWidth, /*isSigned=*/true,
- APFloat::rmTowardZero, &isExact);
+ APFloat::rmTowardZero, &isExact);
if (isExact) {
- APInt IntVal(IntBitWidth, 2, x);
+ APInt IntVal(IntBitWidth, x);
- unsigned IntegerReg = getRegForValue(Context->getConstantInt(IntVal));
+ unsigned IntegerReg =
+ getRegForValue(ConstantInt::get(V->getContext(), IntVal));
if (IntegerReg != 0)
- Reg = FastEmit_r(IntVT.getSimpleVT(), VT, ISD::SINT_TO_FP, IntegerReg);
+ Reg = FastEmit_r(IntVT.getSimpleVT(), VT, ISD::SINT_TO_FP,
+ IntegerReg, /*Kill=*/false);
}
}
- } else if (ConstantExpr *CE = dyn_cast<ConstantExpr>(V)) {
- if (!SelectOperator(CE, CE->getOpcode())) return 0;
- Reg = LocalValueMap[CE];
+ } else if (const Operator *Op = dyn_cast<Operator>(V)) {
+ if (!SelectOperator(Op, Op->getOpcode()))
+ if (!isa<Instruction>(Op) ||
+ !TargetSelectInstruction(cast<Instruction>(Op)))
+ return 0;
+ Reg = lookUpRegForValue(Op);
} else if (isa<UndefValue>(V)) {
Reg = createResultReg(TLI.getRegClassFor(VT));
- BuildMI(MBB, DL, TII.get(TargetInstrInfo::IMPLICIT_DEF), Reg);
+ BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
+ TII.get(TargetOpcode::IMPLICIT_DEF), Reg);
}
-
+
// If target-independent code couldn't handle the value, give target-specific
// code a try.
if (!Reg && isa<Constant>(V))
Reg = TargetMaterializeConstant(cast<Constant>(V));
-
+
// Don't cache constant materializations in the general ValueMap.
// To do so would require tracking what uses they dominate.
- if (Reg != 0)
+ if (Reg != 0) {
LocalValueMap[V] = Reg;
+ LastLocalValue = MRI.getVRegDef(Reg);
+ }
return Reg;
}
-unsigned FastISel::lookUpRegForValue(Value *V) {
+unsigned FastISel::lookUpRegForValue(const Value *V) {
// Look up the value to see if we already have a register for it. We
// cache values defined by Instructions across blocks, and other values
// only locally. This is because Instructions already have the SSA
- // def-dominatess-use requirement enforced.
- if (ValueMap.count(V))
- return ValueMap[V];
+ // def-dominates-use requirement enforced.
+ DenseMap<const Value *, unsigned>::iterator I = FuncInfo.ValueMap.find(V);
+ if (I != FuncInfo.ValueMap.end())
+ return I->second;
return LocalValueMap[V];
}
/// NOTE: This is only necessary because we might select a block that uses
/// a value before we select the block that defines the value. It might be
/// possible to fix this by selecting blocks in reverse postorder.
-unsigned FastISel::UpdateValueMap(Value* I, unsigned Reg) {
+void FastISel::UpdateValueMap(const Value *I, unsigned Reg, unsigned NumRegs) {
if (!isa<Instruction>(I)) {
LocalValueMap[I] = Reg;
- return Reg;
+ return;
}
-
- unsigned &AssignedReg = ValueMap[I];
+
+ unsigned &AssignedReg = FuncInfo.ValueMap[I];
if (AssignedReg == 0)
+ // Use the new register.
AssignedReg = Reg;
else if (Reg != AssignedReg) {
- const TargetRegisterClass *RegClass = MRI.getRegClass(Reg);
- TII.copyRegToReg(*MBB, MBB->end(), AssignedReg,
- Reg, RegClass, RegClass);
+ // Arrange for uses of AssignedReg to be replaced by uses of Reg.
+ for (unsigned i = 0; i < NumRegs; i++)
+ FuncInfo.RegFixups[AssignedReg+i] = Reg+i;
+
+ AssignedReg = Reg;
}
- return AssignedReg;
}
-unsigned FastISel::getRegForGEPIndex(Value *Idx) {
+std::pair<unsigned, bool> FastISel::getRegForGEPIndex(const Value *Idx) {
unsigned IdxN = getRegForValue(Idx);
if (IdxN == 0)
// Unhandled operand. Halt "fast" selection and bail.
- return 0;
+ return std::pair<unsigned, bool>(0, false);
+
+ bool IdxNIsKill = hasTrivialKill(Idx);
// If the index is smaller or larger than intptr_t, truncate or extend it.
MVT PtrVT = TLI.getPointerTy();
- MVT IdxVT = MVT::getMVT(Idx->getType(), /*HandleUnknown=*/false);
- if (IdxVT.bitsLT(PtrVT))
- IdxN = FastEmit_r(IdxVT.getSimpleVT(), PtrVT.getSimpleVT(),
- ISD::SIGN_EXTEND, IdxN);
- else if (IdxVT.bitsGT(PtrVT))
- IdxN = FastEmit_r(IdxVT.getSimpleVT(), PtrVT.getSimpleVT(),
- ISD::TRUNCATE, IdxN);
- return IdxN;
+ EVT IdxVT = EVT::getEVT(Idx->getType(), /*HandleUnknown=*/false);
+ if (IdxVT.bitsLT(PtrVT)) {
+ IdxN = FastEmit_r(IdxVT.getSimpleVT(), PtrVT, ISD::SIGN_EXTEND,
+ IdxN, IdxNIsKill);
+ IdxNIsKill = true;
+ }
+ else if (IdxVT.bitsGT(PtrVT)) {
+ IdxN = FastEmit_r(IdxVT.getSimpleVT(), PtrVT, ISD::TRUNCATE,
+ IdxN, IdxNIsKill);
+ IdxNIsKill = true;
+ }
+ return std::pair<unsigned, bool>(IdxN, IdxNIsKill);
+}
+
+void FastISel::recomputeInsertPt() {
+ if (getLastLocalValue()) {
+ FuncInfo.InsertPt = getLastLocalValue();
+ FuncInfo.MBB = FuncInfo.InsertPt->getParent();
+ ++FuncInfo.InsertPt;
+ } else
+ FuncInfo.InsertPt = FuncInfo.MBB->getFirstNonPHI();
+
+ // Now skip past any EH_LABELs, which must remain at the beginning.
+ while (FuncInfo.InsertPt != FuncInfo.MBB->end() &&
+ FuncInfo.InsertPt->getOpcode() == TargetOpcode::EH_LABEL)
+ ++FuncInfo.InsertPt;
+}
+
+void FastISel::removeDeadCode(MachineBasicBlock::iterator I,
+ MachineBasicBlock::iterator E) {
+ assert (I && E && std::distance(I, E) > 0 && "Invalid iterator!");
+ while (I != E) {
+ MachineInstr *Dead = &*I;
+ ++I;
+ Dead->eraseFromParent();
+ ++NumFastIselDead;
+ }
+ recomputeInsertPt();
+}
+
+FastISel::SavePoint FastISel::enterLocalValueArea() {
+ MachineBasicBlock::iterator OldInsertPt = FuncInfo.InsertPt;
+ DebugLoc OldDL = DL;
+ recomputeInsertPt();
+ DL = DebugLoc();
+ SavePoint SP = { OldInsertPt, OldDL };
+ return SP;
+}
+
+void FastISel::leaveLocalValueArea(SavePoint OldInsertPt) {
+ if (FuncInfo.InsertPt != FuncInfo.MBB->begin())
+ LastLocalValue = llvm::prior(FuncInfo.InsertPt);
+
+ // Restore the previous insert position.
+ FuncInfo.InsertPt = OldInsertPt.InsertPt;
+ DL = OldInsertPt.DL;
}
/// SelectBinaryOp - Select and emit code for a binary operator instruction,
/// which has an opcode which directly corresponds to the given ISD opcode.
///
-bool FastISel::SelectBinaryOp(User *I, ISD::NodeType ISDOpcode) {
- MVT VT = MVT::getMVT(I->getType(), /*HandleUnknown=*/true);
+bool FastISel::SelectBinaryOp(const User *I, unsigned ISDOpcode) {
+ EVT VT = EVT::getEVT(I->getType(), /*HandleUnknown=*/true);
if (VT == MVT::Other || !VT.isSimple())
// Unhandled type. Halt "fast" selection and bail.
return false;
if (VT == MVT::i1 &&
(ISDOpcode == ISD::AND || ISDOpcode == ISD::OR ||
ISDOpcode == ISD::XOR))
- VT = TLI.getTypeToTransformTo(VT);
+ VT = TLI.getTypeToTransformTo(I->getContext(), VT);
else
return false;
}
+ // Check if the first operand is a constant, and handle it as "ri". At -O0,
+ // we don't have anything that canonicalizes operand order.
+ if (ConstantInt *CI = dyn_cast<ConstantInt>(I->getOperand(0)))
+ if (isa<Instruction>(I) && cast<Instruction>(I)->isCommutative()) {
+ unsigned Op1 = getRegForValue(I->getOperand(1));
+ if (Op1 == 0) return false;
+
+ bool Op1IsKill = hasTrivialKill(I->getOperand(1));
+
+ unsigned ResultReg = FastEmit_ri_(VT.getSimpleVT(), ISDOpcode, Op1,
+ Op1IsKill, CI->getZExtValue(),
+ VT.getSimpleVT());
+ if (ResultReg == 0) return false;
+
+ // We successfully emitted code for the given LLVM Instruction.
+ UpdateValueMap(I, ResultReg);
+ return true;
+ }
+
+
unsigned Op0 = getRegForValue(I->getOperand(0));
- if (Op0 == 0)
- // Unhandled operand. Halt "fast" selection and bail.
+ if (Op0 == 0) // Unhandled operand. Halt "fast" selection and bail.
return false;
+ bool Op0IsKill = hasTrivialKill(I->getOperand(0));
+
// Check if the second operand is a constant and handle it appropriately.
if (ConstantInt *CI = dyn_cast<ConstantInt>(I->getOperand(1))) {
- unsigned ResultReg = FastEmit_ri(VT.getSimpleVT(), VT.getSimpleVT(),
- ISDOpcode, Op0, CI->getZExtValue());
- if (ResultReg != 0) {
- // We successfully emitted code for the given LLVM Instruction.
- UpdateValueMap(I, ResultReg);
- return true;
+ uint64_t Imm = CI->getZExtValue();
+
+ // Transform "sdiv exact X, 8" -> "sra X, 3".
+ if (ISDOpcode == ISD::SDIV && isa<BinaryOperator>(I) &&
+ cast<BinaryOperator>(I)->isExact() &&
+ isPowerOf2_64(Imm)) {
+ Imm = Log2_64(Imm);
+ ISDOpcode = ISD::SRA;
+ }
+
+ // Transform "urem x, pow2" -> "and x, pow2-1".
+ if (ISDOpcode == ISD::UREM && isa<BinaryOperator>(I) &&
+ isPowerOf2_64(Imm)) {
+ --Imm;
+ ISDOpcode = ISD::AND;
}
+
+ unsigned ResultReg = FastEmit_ri_(VT.getSimpleVT(), ISDOpcode, Op0,
+ Op0IsKill, Imm, VT.getSimpleVT());
+ if (ResultReg == 0) return false;
+
+ // We successfully emitted code for the given LLVM Instruction.
+ UpdateValueMap(I, ResultReg);
+ return true;
}
// Check if the second operand is a constant float.
if (ConstantFP *CF = dyn_cast<ConstantFP>(I->getOperand(1))) {
unsigned ResultReg = FastEmit_rf(VT.getSimpleVT(), VT.getSimpleVT(),
- ISDOpcode, Op0, CF);
+ ISDOpcode, Op0, Op0IsKill, CF);
if (ResultReg != 0) {
// We successfully emitted code for the given LLVM Instruction.
UpdateValueMap(I, ResultReg);
// Unhandled operand. Halt "fast" selection and bail.
return false;
+ bool Op1IsKill = hasTrivialKill(I->getOperand(1));
+
// Now we have both operands in registers. Emit the instruction.
unsigned ResultReg = FastEmit_rr(VT.getSimpleVT(), VT.getSimpleVT(),
- ISDOpcode, Op0, Op1);
+ ISDOpcode,
+ Op0, Op0IsKill,
+ Op1, Op1IsKill);
if (ResultReg == 0)
// Target-specific code wasn't able to find a machine opcode for
// the given ISD opcode and type. Halt "fast" selection and bail.
return true;
}
-bool FastISel::SelectGetElementPtr(User *I) {
+bool FastISel::SelectGetElementPtr(const User *I) {
unsigned N = getRegForValue(I->getOperand(0));
if (N == 0)
// Unhandled operand. Halt "fast" selection and bail.
return false;
- const Type *Ty = I->getOperand(0)->getType();
- MVT::SimpleValueType VT = TLI.getPointerTy().getSimpleVT();
- for (GetElementPtrInst::op_iterator OI = I->op_begin()+1, E = I->op_end();
- OI != E; ++OI) {
- Value *Idx = *OI;
- if (const StructType *StTy = dyn_cast<StructType>(Ty)) {
+ bool NIsKill = hasTrivialKill(I->getOperand(0));
+
+ // Keep a running tab of the total offset to coalesce multiple N = N + Offset
+ // into a single N = N + TotalOffset.
+ uint64_t TotalOffs = 0;
+ // FIXME: What's a good SWAG number for MaxOffs?
+ uint64_t MaxOffs = 2048;
+ Type *Ty = I->getOperand(0)->getType();
+ MVT VT = TLI.getPointerTy();
+ for (GetElementPtrInst::const_op_iterator OI = I->op_begin()+1,
+ E = I->op_end(); OI != E; ++OI) {
+ const Value *Idx = *OI;
+ if (StructType *StTy = dyn_cast<StructType>(Ty)) {
unsigned Field = cast<ConstantInt>(Idx)->getZExtValue();
if (Field) {
// N = N + Offset
- uint64_t Offs = TD.getStructLayout(StTy)->getElementOffset(Field);
- // FIXME: This can be optimized by combining the add with a
- // subsequent one.
- N = FastEmit_ri_(VT, ISD::ADD, N, Offs, VT);
- if (N == 0)
- // Unhandled operand. Halt "fast" selection and bail.
- return false;
+ TotalOffs += TD.getStructLayout(StTy)->getElementOffset(Field);
+ if (TotalOffs >= MaxOffs) {
+ N = FastEmit_ri_(VT, ISD::ADD, N, NIsKill, TotalOffs, VT);
+ if (N == 0)
+ // Unhandled operand. Halt "fast" selection and bail.
+ return false;
+ NIsKill = true;
+ TotalOffs = 0;
+ }
}
Ty = StTy->getElementType(Field);
} else {
Ty = cast<SequentialType>(Ty)->getElementType();
// If this is a constant subscript, handle it quickly.
- if (ConstantInt *CI = dyn_cast<ConstantInt>(Idx)) {
- if (CI->getZExtValue() == 0) continue;
- uint64_t Offs =
+ if (const ConstantInt *CI = dyn_cast<ConstantInt>(Idx)) {
+ if (CI->isZero()) continue;
+ // N = N + Offset
+ TotalOffs +=
TD.getTypeAllocSize(Ty)*cast<ConstantInt>(CI)->getSExtValue();
- N = FastEmit_ri_(VT, ISD::ADD, N, Offs, VT);
+ if (TotalOffs >= MaxOffs) {
+ N = FastEmit_ri_(VT, ISD::ADD, N, NIsKill, TotalOffs, VT);
+ if (N == 0)
+ // Unhandled operand. Halt "fast" selection and bail.
+ return false;
+ NIsKill = true;
+ TotalOffs = 0;
+ }
+ continue;
+ }
+ if (TotalOffs) {
+ N = FastEmit_ri_(VT, ISD::ADD, N, NIsKill, TotalOffs, VT);
if (N == 0)
// Unhandled operand. Halt "fast" selection and bail.
return false;
- continue;
+ NIsKill = true;
+ TotalOffs = 0;
}
-
+
// N = N + Idx * ElementSize;
uint64_t ElementSize = TD.getTypeAllocSize(Ty);
- unsigned IdxN = getRegForGEPIndex(Idx);
+ std::pair<unsigned, bool> Pair = getRegForGEPIndex(Idx);
+ unsigned IdxN = Pair.first;
+ bool IdxNIsKill = Pair.second;
if (IdxN == 0)
// Unhandled operand. Halt "fast" selection and bail.
return false;
if (ElementSize != 1) {
- IdxN = FastEmit_ri_(VT, ISD::MUL, IdxN, ElementSize, VT);
+ IdxN = FastEmit_ri_(VT, ISD::MUL, IdxN, IdxNIsKill, ElementSize, VT);
if (IdxN == 0)
// Unhandled operand. Halt "fast" selection and bail.
return false;
+ IdxNIsKill = true;
}
- N = FastEmit_rr(VT, VT, ISD::ADD, N, IdxN);
+ N = FastEmit_rr(VT, VT, ISD::ADD, N, NIsKill, IdxN, IdxNIsKill);
if (N == 0)
// Unhandled operand. Halt "fast" selection and bail.
return false;
}
}
+ if (TotalOffs) {
+ N = FastEmit_ri_(VT, ISD::ADD, N, NIsKill, TotalOffs, VT);
+ if (N == 0)
+ // Unhandled operand. Halt "fast" selection and bail.
+ return false;
+ }
// We successfully emitted code for the given LLVM Instruction.
UpdateValueMap(I, N);
return true;
}
-bool FastISel::SelectCall(User *I) {
- Function *F = cast<CallInst>(I)->getCalledFunction();
- if (!F) return false;
+bool FastISel::SelectCall(const User *I) {
+ const CallInst *Call = cast<CallInst>(I);
- unsigned IID = F->getIntrinsicID();
- switch (IID) {
- default: break;
- case Intrinsic::dbg_stoppoint: {
- DbgStopPointInst *SPI = cast<DbgStopPointInst>(I);
- if (isValidDebugInfoIntrinsic(*SPI, CodeGenOpt::None))
- setCurDebugLoc(ExtractDebugLocation(*SPI, MF.getDebugLocInfo()));
- return true;
- }
- case Intrinsic::dbg_region_start: {
- DbgRegionStartInst *RSI = cast<DbgRegionStartInst>(I);
- if (isValidDebugInfoIntrinsic(*RSI, CodeGenOpt::None) && DW
- && DW->ShouldEmitDwarfDebug()) {
- unsigned ID =
- DW->RecordRegionStart(cast<GlobalVariable>(RSI->getContext()));
- const TargetInstrDesc &II = TII.get(TargetInstrInfo::DBG_LABEL);
- BuildMI(MBB, DL, II).addImm(ID);
- }
- return true;
- }
- case Intrinsic::dbg_region_end: {
- DbgRegionEndInst *REI = cast<DbgRegionEndInst>(I);
- if (isValidDebugInfoIntrinsic(*REI, CodeGenOpt::None) && DW
- && DW->ShouldEmitDwarfDebug()) {
- unsigned ID = 0;
- DISubprogram Subprogram(cast<GlobalVariable>(REI->getContext()));
- if (isInlinedFnEnd(*REI, MF.getFunction())) {
- // This is end of an inlined function.
- const TargetInstrDesc &II = TII.get(TargetInstrInfo::DBG_LABEL);
- ID = DW->RecordInlinedFnEnd(Subprogram);
- if (ID)
- // Returned ID is 0 if this is unbalanced "end of inlined
- // scope". This could happen if optimizer eats dbg intrinsics
- // or "beginning of inlined scope" is not recoginized due to
- // missing location info. In such cases, ignore this region.end.
- BuildMI(MBB, DL, II).addImm(ID);
- } else {
- const TargetInstrDesc &II = TII.get(TargetInstrInfo::DBG_LABEL);
- ID = DW->RecordRegionEnd(cast<GlobalVariable>(REI->getContext()));
- BuildMI(MBB, DL, II).addImm(ID);
- }
- }
+ // Handle simple inline asms.
+ if (const InlineAsm *IA = dyn_cast<InlineAsm>(Call->getCalledValue())) {
+ // Don't attempt to handle constraints.
+ if (!IA->getConstraintString().empty())
+ return false;
+
+ unsigned ExtraInfo = 0;
+ if (IA->hasSideEffects())
+ ExtraInfo |= InlineAsm::Extra_HasSideEffects;
+ if (IA->isAlignStack())
+ ExtraInfo |= InlineAsm::Extra_IsAlignStack;
+
+ BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
+ TII.get(TargetOpcode::INLINEASM))
+ .addExternalSymbol(IA->getAsmString().c_str())
+ .addImm(ExtraInfo);
return true;
}
- case Intrinsic::dbg_func_start: {
- DbgFuncStartInst *FSI = cast<DbgFuncStartInst>(I);
- if (!isValidDebugInfoIntrinsic(*FSI, CodeGenOpt::None) || !DW
- || !DW->ShouldEmitDwarfDebug())
- return true;
- if (isInlinedFnStart(*FSI, MF.getFunction())) {
- // This is a beginning of an inlined function.
-
- // If llvm.dbg.func.start is seen in a new block before any
- // llvm.dbg.stoppoint intrinsic then the location info is unknown.
- // FIXME : Why DebugLoc is reset at the beginning of each block ?
- DebugLoc PrevLoc = DL;
- if (PrevLoc.isUnknown())
- return true;
- // Record the source line.
- setCurDebugLoc(ExtractDebugLocation(*FSI, MF.getDebugLocInfo()));
-
- DebugLocTuple PrevLocTpl = MF.getDebugLocTuple(PrevLoc);
- DISubprogram SP(cast<GlobalVariable>(FSI->getSubprogram()));
- unsigned LabelID = DW->RecordInlinedFnStart(SP,
- DICompileUnit(PrevLocTpl.CompileUnit),
- PrevLocTpl.Line,
- PrevLocTpl.Col);
- const TargetInstrDesc &II = TII.get(TargetInstrInfo::DBG_LABEL);
- BuildMI(MBB, DL, II).addImm(LabelID);
- return true;
- }
-
- // This is a beginning of a new function.
- MF.setDefaultDebugLoc(ExtractDebugLocation(*FSI, MF.getDebugLocInfo()));
-
- // llvm.dbg.func_start also defines beginning of function scope.
- DW->RecordRegionStart(cast<GlobalVariable>(FSI->getSubprogram()));
+ MachineModuleInfo &MMI = FuncInfo.MF->getMMI();
+ ComputeUsesVAFloatArgument(*Call, &MMI);
+
+ const Function *F = Call->getCalledFunction();
+ if (!F) return false;
+
+ // Handle selected intrinsic function calls.
+ switch (F->getIntrinsicID()) {
+ default: break;
+ // At -O0 we don't care about the lifetime intrinsics.
+ case Intrinsic::lifetime_start:
+ case Intrinsic::lifetime_end:
return true;
- }
case Intrinsic::dbg_declare: {
- DbgDeclareInst *DI = cast<DbgDeclareInst>(I);
- if (!isValidDebugInfoIntrinsic(*DI, CodeGenOpt::None) || !DW
- || !DW->ShouldEmitDwarfDebug())
+ const DbgDeclareInst *DI = cast<DbgDeclareInst>(Call);
+ if (!DIVariable(DI->getVariable()).Verify() ||
+ !FuncInfo.MF->getMMI().hasDebugInfo()) {
+ DEBUG(dbgs() << "Dropping debug info for " << *DI << "\n");
return true;
+ }
- Value *Variable = DI->getVariable();
- Value *Address = DI->getAddress();
- if (BitCastInst *BCI = dyn_cast<BitCastInst>(Address))
- Address = BCI->getOperand(0);
- AllocaInst *AI = dyn_cast<AllocaInst>(Address);
- // Don't handle byval struct arguments or VLAs, for example.
- if (!AI) break;
- DenseMap<const AllocaInst*, int>::iterator SI =
- StaticAllocaMap.find(AI);
- if (SI == StaticAllocaMap.end()) break; // VLAs.
- int FI = SI->second;
-
- // Determine the debug globalvariable.
- GlobalValue *GV = cast<GlobalVariable>(Variable);
-
- // Build the DECLARE instruction.
- const TargetInstrDesc &II = TII.get(TargetInstrInfo::DECLARE);
- MachineInstr *DeclareMI
- = BuildMI(MBB, DL, II).addFrameIndex(FI).addGlobalAddress(GV);
- DIVariable DV(cast<GlobalVariable>(GV));
- DW->RecordVariableScope(DV, DeclareMI);
- return true;
- }
- case Intrinsic::eh_exception: {
- MVT VT = TLI.getValueType(I->getType());
- switch (TLI.getOperationAction(ISD::EXCEPTIONADDR, VT)) {
- default: break;
- case TargetLowering::Expand: {
- assert(MBB->isLandingPad() && "Call to eh.exception not in landing pad!");
- unsigned Reg = TLI.getExceptionAddressRegister();
- const TargetRegisterClass *RC = TLI.getRegClassFor(VT);
- unsigned ResultReg = createResultReg(RC);
- bool InsertedCopy = TII.copyRegToReg(*MBB, MBB->end(), ResultReg,
- Reg, RC, RC);
- assert(InsertedCopy && "Can't copy address registers!");
- InsertedCopy = InsertedCopy;
- UpdateValueMap(I, ResultReg);
+ const Value *Address = DI->getAddress();
+ if (!Address || isa<UndefValue>(Address)) {
+ DEBUG(dbgs() << "Dropping debug info for " << *DI << "\n");
return true;
}
- }
- break;
- }
- case Intrinsic::eh_selector_i32:
- case Intrinsic::eh_selector_i64: {
- MVT VT = TLI.getValueType(I->getType());
- switch (TLI.getOperationAction(ISD::EHSELECTION, VT)) {
- default: break;
- case TargetLowering::Expand: {
- MVT VT = (IID == Intrinsic::eh_selector_i32 ?
- MVT::i32 : MVT::i64);
-
- if (MMI) {
- if (MBB->isLandingPad())
- AddCatchInfo(*cast<CallInst>(I), MMI, MBB);
- else {
-#ifndef NDEBUG
- CatchInfoLost.insert(cast<CallInst>(I));
-#endif
- // FIXME: Mark exception selector register as live in. Hack for PR1508.
- unsigned Reg = TLI.getExceptionSelectorRegister();
- if (Reg) MBB->addLiveIn(Reg);
- }
- unsigned Reg = TLI.getExceptionSelectorRegister();
- const TargetRegisterClass *RC = TLI.getRegClassFor(VT);
- unsigned ResultReg = createResultReg(RC);
- bool InsertedCopy = TII.copyRegToReg(*MBB, MBB->end(), ResultReg,
- Reg, RC, RC);
- assert(InsertedCopy && "Can't copy address registers!");
- InsertedCopy = InsertedCopy;
- UpdateValueMap(I, ResultReg);
- } else {
- unsigned ResultReg =
- getRegForValue(Context->getNullValue(I->getType()));
- UpdateValueMap(I, ResultReg);
- }
- return true;
+ unsigned Reg = 0;
+ unsigned Offset = 0;
+ if (const Argument *Arg = dyn_cast<Argument>(Address)) {
+ // Some arguments' frame index is recorded during argument lowering.
+ Offset = FuncInfo.getArgumentFrameIndex(Arg);
+ if (Offset)
+ Reg = TRI.getFrameRegister(*FuncInfo.MF);
}
+ if (!Reg)
+ Reg = lookUpRegForValue(Address);
+
+ if (!Reg && isa<Instruction>(Address) &&
+ (!isa<AllocaInst>(Address) ||
+ !FuncInfo.StaticAllocaMap.count(cast<AllocaInst>(Address))))
+ Reg = FuncInfo.InitializeRegForValue(Address);
+
+ if (Reg)
+ BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
+ TII.get(TargetOpcode::DBG_VALUE))
+ .addReg(Reg, RegState::Debug).addImm(Offset)
+ .addMetadata(DI->getVariable());
+ else
+ // We can't yet handle anything else here because it would require
+ // generating code, thus altering codegen because of debug info.
+ DEBUG(dbgs() << "Dropping debug info for " << DI);
+ return true;
+ }
+ case Intrinsic::dbg_value: {
+ // This form of DBG_VALUE is target-independent.
+ const DbgValueInst *DI = cast<DbgValueInst>(Call);
+ const MCInstrDesc &II = TII.get(TargetOpcode::DBG_VALUE);
+ const Value *V = DI->getValue();
+ if (!V) {
+ // Currently the optimizer can produce this; insert an undef to
+ // help debugging. Probably the optimizer should not do this.
+ BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II)
+ .addReg(0U).addImm(DI->getOffset())
+ .addMetadata(DI->getVariable());
+ } else if (const ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
+ if (CI->getBitWidth() > 64)
+ BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II)
+ .addCImm(CI).addImm(DI->getOffset())
+ .addMetadata(DI->getVariable());
+ else
+ BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II)
+ .addImm(CI->getZExtValue()).addImm(DI->getOffset())
+ .addMetadata(DI->getVariable());
+ } else if (const ConstantFP *CF = dyn_cast<ConstantFP>(V)) {
+ BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II)
+ .addFPImm(CF).addImm(DI->getOffset())
+ .addMetadata(DI->getVariable());
+ } else if (unsigned Reg = lookUpRegForValue(V)) {
+ BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II)
+ .addReg(Reg, RegState::Debug).addImm(DI->getOffset())
+ .addMetadata(DI->getVariable());
+ } else {
+ // We can't yet handle anything else here because it would require
+ // generating code, thus altering codegen because of debug info.
+ DEBUG(dbgs() << "Dropping debug info for " << DI);
}
- break;
+ return true;
}
+ case Intrinsic::objectsize: {
+ ConstantInt *CI = cast<ConstantInt>(Call->getArgOperand(1));
+ unsigned long long Res = CI->isZero() ? -1ULL : 0;
+ Constant *ResCI = ConstantInt::get(Call->getType(), Res);
+ unsigned ResultReg = getRegForValue(ResCI);
+ if (ResultReg == 0)
+ return false;
+ UpdateValueMap(Call, ResultReg);
+ return true;
}
+ }
+
+ // Usually, it does not make sense to initialize a value,
+ // make an unrelated function call and use the value, because
+ // it tends to be spilled on the stack. So, we move the pointer
+ // to the last local value to the beginning of the block, so that
+ // all the values which have already been materialized,
+ // appear after the call. It also makes sense to skip intrinsics
+ // since they tend to be inlined.
+ if (!isa<IntrinsicInst>(F))
+ flushLocalValueMap();
+
+ // An arbitrary call. Bail.
return false;
}
-bool FastISel::SelectCast(User *I, ISD::NodeType Opcode) {
- MVT SrcVT = TLI.getValueType(I->getOperand(0)->getType());
- MVT DstVT = TLI.getValueType(I->getType());
-
+bool FastISel::SelectCast(const User *I, unsigned Opcode) {
+ EVT SrcVT = TLI.getValueType(I->getOperand(0)->getType());
+ EVT DstVT = TLI.getValueType(I->getType());
+
if (SrcVT == MVT::Other || !SrcVT.isSimple() ||
DstVT == MVT::Other || !DstVT.isSimple())
// Unhandled type. Halt "fast" selection and bail.
return false;
-
- // Check if the destination type is legal. Or as a special case,
- // it may be i1 if we're doing a truncate because that's
- // easy and somewhat common.
+
+ // Check if the destination type is legal.
if (!TLI.isTypeLegal(DstVT))
- if (DstVT != MVT::i1 || Opcode != ISD::TRUNCATE)
- // Unhandled type. Halt "fast" selection and bail.
- return false;
+ return false;
- // Check if the source operand is legal. Or as a special case,
- // it may be i1 if we're doing zero-extension because that's
- // easy and somewhat common.
+ // Check if the source operand is legal.
if (!TLI.isTypeLegal(SrcVT))
- if (SrcVT != MVT::i1 || Opcode != ISD::ZERO_EXTEND)
- // Unhandled type. Halt "fast" selection and bail.
- return false;
+ return false;
unsigned InputReg = getRegForValue(I->getOperand(0));
if (!InputReg)
// Unhandled operand. Halt "fast" selection and bail.
return false;
- // If the operand is i1, arrange for the high bits in the register to be zero.
- if (SrcVT == MVT::i1) {
- SrcVT = TLI.getTypeToTransformTo(SrcVT);
- InputReg = FastEmitZExtFromI1(SrcVT.getSimpleVT(), InputReg);
- if (!InputReg)
- return false;
- }
- // If the result is i1, truncate to the target's type for i1 first.
- if (DstVT == MVT::i1)
- DstVT = TLI.getTypeToTransformTo(DstVT);
+ bool InputRegIsKill = hasTrivialKill(I->getOperand(0));
unsigned ResultReg = FastEmit_r(SrcVT.getSimpleVT(),
DstVT.getSimpleVT(),
Opcode,
- InputReg);
+ InputReg, InputRegIsKill);
if (!ResultReg)
return false;
-
+
UpdateValueMap(I, ResultReg);
return true;
}
-bool FastISel::SelectBitCast(User *I) {
+bool FastISel::SelectBitCast(const User *I) {
// If the bitcast doesn't change the type, just use the operand value.
if (I->getType() == I->getOperand(0)->getType()) {
unsigned Reg = getRegForValue(I->getOperand(0));
return true;
}
- // Bitcasts of other values become reg-reg copies or BIT_CONVERT operators.
- MVT SrcVT = TLI.getValueType(I->getOperand(0)->getType());
- MVT DstVT = TLI.getValueType(I->getType());
-
+ // Bitcasts of other values become reg-reg copies or BITCAST operators.
+ EVT SrcVT = TLI.getValueType(I->getOperand(0)->getType());
+ EVT DstVT = TLI.getValueType(I->getType());
+
if (SrcVT == MVT::Other || !SrcVT.isSimple() ||
DstVT == MVT::Other || !DstVT.isSimple() ||
!TLI.isTypeLegal(SrcVT) || !TLI.isTypeLegal(DstVT))
// Unhandled type. Halt "fast" selection and bail.
return false;
-
+
unsigned Op0 = getRegForValue(I->getOperand(0));
if (Op0 == 0)
// Unhandled operand. Halt "fast" selection and bail.
return false;
-
+
+ bool Op0IsKill = hasTrivialKill(I->getOperand(0));
+
// First, try to perform the bitcast by inserting a reg-reg copy.
unsigned ResultReg = 0;
if (SrcVT.getSimpleVT() == DstVT.getSimpleVT()) {
- TargetRegisterClass* SrcClass = TLI.getRegClassFor(SrcVT);
- TargetRegisterClass* DstClass = TLI.getRegClassFor(DstVT);
- ResultReg = createResultReg(DstClass);
-
- bool InsertedCopy = TII.copyRegToReg(*MBB, MBB->end(), ResultReg,
- Op0, DstClass, SrcClass);
- if (!InsertedCopy)
- ResultReg = 0;
- }
-
- // If the reg-reg copy failed, select a BIT_CONVERT opcode.
+ const TargetRegisterClass* SrcClass = TLI.getRegClassFor(SrcVT);
+ const TargetRegisterClass* DstClass = TLI.getRegClassFor(DstVT);
+ // Don't attempt a cross-class copy. It will likely fail.
+ if (SrcClass == DstClass) {
+ ResultReg = createResultReg(DstClass);
+ BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(TargetOpcode::COPY),
+ ResultReg).addReg(Op0);
+ }
+ }
+
+ // If the reg-reg copy failed, select a BITCAST opcode.
if (!ResultReg)
ResultReg = FastEmit_r(SrcVT.getSimpleVT(), DstVT.getSimpleVT(),
- ISD::BIT_CONVERT, Op0);
-
+ ISD::BITCAST, Op0, Op0IsKill);
+
if (!ResultReg)
return false;
-
+
UpdateValueMap(I, ResultReg);
return true;
}
bool
-FastISel::SelectInstruction(Instruction *I) {
- return SelectOperator(I, I->getOpcode());
+FastISel::SelectInstruction(const Instruction *I) {
+ // Just before the terminator instruction, insert instructions to
+ // feed PHI nodes in successor blocks.
+ if (isa<TerminatorInst>(I))
+ if (!HandlePHINodesInSuccessorBlocks(I->getParent()))
+ return false;
+
+ DL = I->getDebugLoc();
+
+ MachineBasicBlock::iterator SavedInsertPt = FuncInfo.InsertPt;
+
+ // First, try doing target-independent selection.
+ if (SelectOperator(I, I->getOpcode())) {
+ ++NumFastIselSuccessIndependent;
+ DL = DebugLoc();
+ return true;
+ }
+ // Remove dead code. However, ignore call instructions since we've flushed
+ // the local value map and recomputed the insert point.
+ if (!isa<CallInst>(I)) {
+ recomputeInsertPt();
+ if (SavedInsertPt != FuncInfo.InsertPt)
+ removeDeadCode(FuncInfo.InsertPt, SavedInsertPt);
+ }
+
+ // Next, try calling the target to attempt to handle the instruction.
+ SavedInsertPt = FuncInfo.InsertPt;
+ if (TargetSelectInstruction(I)) {
+ ++NumFastIselSuccessTarget;
+ DL = DebugLoc();
+ return true;
+ }
+ // Check for dead code and remove as necessary.
+ recomputeInsertPt();
+ if (SavedInsertPt != FuncInfo.InsertPt)
+ removeDeadCode(FuncInfo.InsertPt, SavedInsertPt);
+
+ DL = DebugLoc();
+ return false;
}
/// FastEmitBranch - Emit an unconditional branch to the given block,
/// unless it is the immediate (fall-through) successor, and update
/// the CFG.
void
-FastISel::FastEmitBranch(MachineBasicBlock *MSucc) {
- MachineFunction::iterator NextMBB =
- next(MachineFunction::iterator(MBB));
-
- if (MBB->isLayoutSuccessor(MSucc)) {
+FastISel::FastEmitBranch(MachineBasicBlock *MSucc, DebugLoc DL) {
+ if (FuncInfo.MBB->isLayoutSuccessor(MSucc)) {
// The unconditional fall-through case, which needs no instructions.
} else {
// The unconditional branch case.
- TII.InsertBranch(*MBB, MSucc, NULL, SmallVector<MachineOperand, 0>());
+ TII.InsertBranch(*FuncInfo.MBB, MSucc, NULL,
+ SmallVector<MachineOperand, 0>(), DL);
+ }
+ FuncInfo.MBB->addSuccessor(MSucc);
+}
+
+/// SelectFNeg - Emit an FNeg operation.
+///
+bool
+FastISel::SelectFNeg(const User *I) {
+ unsigned OpReg = getRegForValue(BinaryOperator::getFNegArgument(I));
+ if (OpReg == 0) return false;
+
+ bool OpRegIsKill = hasTrivialKill(I);
+
+ // If the target has ISD::FNEG, use it.
+ EVT VT = TLI.getValueType(I->getType());
+ unsigned ResultReg = FastEmit_r(VT.getSimpleVT(), VT.getSimpleVT(),
+ ISD::FNEG, OpReg, OpRegIsKill);
+ if (ResultReg != 0) {
+ UpdateValueMap(I, ResultReg);
+ return true;
}
- MBB->addSuccessor(MSucc);
+
+ // Bitcast the value to integer, twiddle the sign bit with xor,
+ // and then bitcast it back to floating-point.
+ if (VT.getSizeInBits() > 64) return false;
+ EVT IntVT = EVT::getIntegerVT(I->getContext(), VT.getSizeInBits());
+ if (!TLI.isTypeLegal(IntVT))
+ return false;
+
+ unsigned IntReg = FastEmit_r(VT.getSimpleVT(), IntVT.getSimpleVT(),
+ ISD::BITCAST, OpReg, OpRegIsKill);
+ if (IntReg == 0)
+ return false;
+
+ unsigned IntResultReg = FastEmit_ri_(IntVT.getSimpleVT(), ISD::XOR,
+ IntReg, /*Kill=*/true,
+ UINT64_C(1) << (VT.getSizeInBits()-1),
+ IntVT.getSimpleVT());
+ if (IntResultReg == 0)
+ return false;
+
+ ResultReg = FastEmit_r(IntVT.getSimpleVT(), VT.getSimpleVT(),
+ ISD::BITCAST, IntResultReg, /*Kill=*/true);
+ if (ResultReg == 0)
+ return false;
+
+ UpdateValueMap(I, ResultReg);
+ return true;
+}
+
+bool
+FastISel::SelectExtractValue(const User *U) {
+ const ExtractValueInst *EVI = dyn_cast<ExtractValueInst>(U);
+ if (!EVI)
+ return false;
+
+ // Make sure we only try to handle extracts with a legal result. But also
+ // allow i1 because it's easy.
+ EVT RealVT = TLI.getValueType(EVI->getType(), /*AllowUnknown=*/true);
+ if (!RealVT.isSimple())
+ return false;
+ MVT VT = RealVT.getSimpleVT();
+ if (!TLI.isTypeLegal(VT) && VT != MVT::i1)
+ return false;
+
+ const Value *Op0 = EVI->getOperand(0);
+ Type *AggTy = Op0->getType();
+
+ // Get the base result register.
+ unsigned ResultReg;
+ DenseMap<const Value *, unsigned>::iterator I = FuncInfo.ValueMap.find(Op0);
+ if (I != FuncInfo.ValueMap.end())
+ ResultReg = I->second;
+ else if (isa<Instruction>(Op0))
+ ResultReg = FuncInfo.InitializeRegForValue(Op0);
+ else
+ return false; // fast-isel can't handle aggregate constants at the moment
+
+ // Get the actual result register, which is an offset from the base register.
+ unsigned VTIndex = ComputeLinearIndex(AggTy, EVI->getIndices());
+
+ SmallVector<EVT, 4> AggValueVTs;
+ ComputeValueVTs(TLI, AggTy, AggValueVTs);
+
+ for (unsigned i = 0; i < VTIndex; i++)
+ ResultReg += TLI.getNumRegisters(FuncInfo.Fn->getContext(), AggValueVTs[i]);
+
+ UpdateValueMap(EVI, ResultReg);
+ return true;
}
bool
-FastISel::SelectOperator(User *I, unsigned Opcode) {
+FastISel::SelectOperator(const User *I, unsigned Opcode) {
switch (Opcode) {
case Instruction::Add:
return SelectBinaryOp(I, ISD::ADD);
case Instruction::Sub:
return SelectBinaryOp(I, ISD::SUB);
case Instruction::FSub:
+ // FNeg is currently represented in LLVM IR as a special case of FSub.
+ if (BinaryOperator::isFNeg(I))
+ return SelectFNeg(I);
return SelectBinaryOp(I, ISD::FSUB);
case Instruction::Mul:
return SelectBinaryOp(I, ISD::MUL);
return SelectGetElementPtr(I);
case Instruction::Br: {
- BranchInst *BI = cast<BranchInst>(I);
+ const BranchInst *BI = cast<BranchInst>(I);
if (BI->isUnconditional()) {
- BasicBlock *LLVMSucc = BI->getSuccessor(0);
- MachineBasicBlock *MSucc = MBBMap[LLVMSucc];
- FastEmitBranch(MSucc);
+ const BasicBlock *LLVMSucc = BI->getSuccessor(0);
+ MachineBasicBlock *MSucc = FuncInfo.MBBMap[LLVMSucc];
+ FastEmitBranch(MSucc, BI->getDebugLoc());
return true;
}
// Nothing to emit.
return true;
- case Instruction::PHI:
- // PHI nodes are already emitted.
- return true;
-
case Instruction::Alloca:
// FunctionLowering has the static-sized case covered.
- if (StaticAllocaMap.count(cast<AllocaInst>(I)))
+ if (
FuncInfo.StaticAllocaMap.count(cast<AllocaInst>(I)))
return true;
// Dynamic-sized alloca is not handled yet.
return false;
-
+
case Instruction::Call:
return SelectCall(I);
-
+
case Instruction::BitCast:
return SelectBitCast(I);
case Instruction::IntToPtr: // Deliberate fall-through.
case Instruction::PtrToInt: {
- MVT SrcVT = TLI.getValueType(I->getOperand(0)->getType());
- MVT DstVT = TLI.getValueType(I->getType());
+ EVT SrcVT = TLI.getValueType(I->getOperand(0)->getType());
+ EVT DstVT = TLI.getValueType(I->getType());
if (DstVT.bitsGT(SrcVT))
return SelectCast(I, ISD::ZERO_EXTEND);
if (DstVT.bitsLT(SrcVT))
return true;
}
+ case Instruction::ExtractValue:
+ return SelectExtractValue(I);
+
+ case Instruction::PHI:
+ llvm_unreachable("FastISel shouldn't visit PHI nodes!");
+
default:
// Unhandled instruction. Halt "fast" selection and bail.
return false;
}
}
-FastISel::FastISel(MachineFunction &mf,
- MachineModuleInfo *mmi,
- DwarfWriter *dw,
- DenseMap<const Value *, unsigned> &vm,
- DenseMap<const BasicBlock *, MachineBasicBlock *> &bm,
- DenseMap<const AllocaInst *, int> &am
-#ifndef NDEBUG
- , SmallSet<Instruction*, 8> &cil
-#endif
- )
- : MBB(0),
- ValueMap(vm),
- MBBMap(bm),
- StaticAllocaMap(am),
-#ifndef NDEBUG
- CatchInfoLost(cil),
-#endif
- MF(mf),
- MMI(mmi),
- DW(dw),
- MRI(MF.getRegInfo()),
- MFI(*MF.getFrameInfo()),
- MCP(*MF.getConstantPool()),
- TM(MF.getTarget()),
+FastISel::FastISel(FunctionLoweringInfo &funcInfo)
+ : FuncInfo(funcInfo),
+ MRI(FuncInfo.MF->getRegInfo()),
+ MFI(*FuncInfo.MF->getFrameInfo()),
+ MCP(*FuncInfo.MF->getConstantPool()),
+ TM(FuncInfo.MF->getTarget()),
TD(*TM.getTargetData()),
TII(*TM.getInstrInfo()),
TLI(*TM.getTargetLowering()),
- Context(mf.getFunction()->getContext()) {
+ TRI(*TM.getRegisterInfo()) {
}
FastISel::~FastISel() {}
-unsigned FastISel::FastEmit_(MVT::SimpleValueType, MVT::SimpleValueType,
- ISD::NodeType) {
+unsigned FastISel::FastEmit_(MVT, MVT,
+ unsigned) {
return 0;
}
-unsigned FastISel::FastEmit_r(MVT::SimpleValueType, MVT::SimpleValueType,
- ISD::NodeType, unsigned /*Op0*/) {
+unsigned FastISel::FastEmit_r(MVT, MVT,
+ unsigned,
+ unsigned /*Op0*/, bool /*Op0IsKill*/) {
return 0;
}
-unsigned FastISel::FastEmit_rr(MVT::SimpleValueType, MVT::SimpleValueType,
- ISD::NodeType, unsigned /*Op0*/,
- unsigned /*Op0*/) {
+unsigned FastISel::FastEmit_rr(MVT, MVT,
+ unsigned,
+ unsigned /*Op0*/, bool /*Op0IsKill*/,
+ unsigned /*Op1*/, bool /*Op1IsKill*/) {
return 0;
}
-unsigned FastISel::FastEmit_i(MVT::SimpleValueType, MVT::SimpleValueType,
- ISD::NodeType, uint64_t /*Imm*/) {
+unsigned FastISel::FastEmit_i(MVT, MVT, unsigned, uint64_t /*Imm*/) {
return 0;
}
-unsigned FastISel::FastEmit_f(MVT::SimpleValueType, MVT::SimpleValueType,
- ISD::NodeType, ConstantFP * /*FPImm*/) {
+unsigned FastISel::FastEmit_f(MVT, MVT,
+ unsigned, const ConstantFP * /*FPImm*/) {
return 0;
}
-unsigned FastISel::FastEmit_ri(MVT::SimpleValueType, MVT::SimpleValueType,
- ISD::NodeType, unsigned /*Op0*/,
+unsigned FastISel::FastEmit_ri(MVT, MVT,
+ unsigned,
+ unsigned /*Op0*/, bool /*Op0IsKill*/,
uint64_t /*Imm*/) {
return 0;
}
-unsigned FastISel::FastEmit_rf(MVT::SimpleValueType, MVT::SimpleValueType,
- ISD::NodeType, unsigned /*Op0*/,
- ConstantFP * /*FPImm*/) {
+unsigned FastISel::FastEmit_rf(MVT, MVT,
+ unsigned,
+ unsigned /*Op0*/, bool /*Op0IsKill*/,
+ const ConstantFP * /*FPImm*/) {
return 0;
}
-unsigned FastISel::FastEmit_rri(MVT::SimpleValueType, MVT::SimpleValueType,
- ISD::NodeType,
- unsigned /*Op0*/, unsigned /*Op1*/,
+unsigned FastISel::FastEmit_rri(MVT, MVT,
+ unsigned,
+ unsigned /*Op0*/, bool /*Op0IsKill*/,
+ unsigned /*Op1*/, bool /*Op1IsKill*/,
uint64_t /*Imm*/) {
return 0;
}
/// to emit an instruction with an immediate operand using FastEmit_ri.
/// If that fails, it materializes the immediate into a register and try
/// FastEmit_rr instead.
-unsigned FastISel::FastEmit_ri_(MVT::SimpleValueType VT, ISD::NodeType Opcode,
- unsigned Op0, uint64_t Imm,
- MVT::SimpleValueType ImmType) {
+unsigned FastISel::FastEmit_ri_(MVT VT, unsigned Opcode,
+ unsigned Op0, bool Op0IsKill,
+ uint64_t Imm, MVT ImmType) {
+ // If this is a multiply by a power of two, emit this as a shift left.
+ if (Opcode == ISD::MUL && isPowerOf2_64(Imm)) {
+ Opcode = ISD::SHL;
+ Imm = Log2_64(Imm);
+ } else if (Opcode == ISD::UDIV && isPowerOf2_64(Imm)) {
+ // div x, 8 -> srl x, 3
+ Opcode = ISD::SRL;
+ Imm = Log2_64(Imm);
+ }
+
+ // Horrible hack (to be removed), check to make sure shift amounts are
+ // in-range.
+ if ((Opcode == ISD::SHL || Opcode == ISD::SRA || Opcode == ISD::SRL) &&
+ Imm >= VT.getSizeInBits())
+ return 0;
+
// First check if immediate type is legal. If not, we can't use the ri form.
- unsigned ResultReg = FastEmit_ri(VT, VT, Opcode, Op0, Imm);
+ unsigned ResultReg = FastEmit_ri(VT, VT, Opcode, Op0, Op0IsKill, Imm);
if (ResultReg != 0)
return ResultReg;
unsigned MaterialReg = FastEmit_i(ImmType, ImmType, ISD::Constant, Imm);
- if (MaterialReg == 0)
- return 0;
- return FastEmit_rr(VT, VT, Opcode, Op0, MaterialReg);
-}
-
-/// FastEmit_rf_ - This method is a wrapper of FastEmit_ri. It first tries
-/// to emit an instruction with a floating-point immediate operand using
-/// FastEmit_rf. If that fails, it materializes the immediate into a register
-/// and try FastEmit_rr instead.
-unsigned FastISel::FastEmit_rf_(MVT::SimpleValueType VT, ISD::NodeType Opcode,
- unsigned Op0, ConstantFP *FPImm,
- MVT::SimpleValueType ImmType) {
- // First check if immediate type is legal. If not, we can't use the rf form.
- unsigned ResultReg = FastEmit_rf(VT, VT, Opcode, Op0, FPImm);
- if (ResultReg != 0)
- return ResultReg;
-
- // Materialize the constant in a register.
- unsigned MaterialReg = FastEmit_f(ImmType, ImmType, ISD::ConstantFP, FPImm);
if (MaterialReg == 0) {
- // If the target doesn't have a way to directly enter a floating-point
- // value into a register, use an alternate approach.
- // TODO: The current approach only supports floating-point constants
- // that can be constructed by conversion from integer values. This should
- // be replaced by code that creates a load from a constant-pool entry,
- // which will require some target-specific work.
- const APFloat &Flt = FPImm->getValueAPF();
- MVT IntVT = TLI.getPointerTy();
-
- uint64_t x[2];
- uint32_t IntBitWidth = IntVT.getSizeInBits();
- bool isExact;
- (void) Flt.convertToInteger(x, IntBitWidth, /*isSigned=*/true,
- APFloat::rmTowardZero, &isExact);
- if (!isExact)
- return 0;
- APInt IntVal(IntBitWidth, 2, x);
-
- unsigned IntegerReg = FastEmit_i(IntVT.getSimpleVT(), IntVT.getSimpleVT(),
- ISD::Constant, IntVal.getZExtValue());
- if (IntegerReg == 0)
- return 0;
- MaterialReg = FastEmit_r(IntVT.getSimpleVT(), VT,
- ISD::SINT_TO_FP, IntegerReg);
- if (MaterialReg == 0)
- return 0;
+ // This is a bit ugly/slow, but failing here means falling out of
+ // fast-isel, which would be very slow.
+ IntegerType *ITy = IntegerType::get(FuncInfo.Fn->getContext(),
+ VT.getSizeInBits());
+ MaterialReg = getRegForValue(ConstantInt::get(ITy, Imm));
}
- return FastEmit_rr(VT, VT, Opcode, Op0, MaterialReg);
+ return FastEmit_rr(VT, VT, Opcode,
+ Op0, Op0IsKill,
+ MaterialReg, /*Kill=*/true);
}
unsigned FastISel::createResultReg(const TargetRegisterClass* RC) {
unsigned FastISel::FastEmitInst_(unsigned MachineInstOpcode,
const TargetRegisterClass* RC) {
unsigned ResultReg = createResultReg(RC);
- const TargetInstrDesc &II = TII.get(MachineInstOpcode);
+ const MCInstrDesc &II = TII.get(MachineInstOpcode);
- BuildMI(MBB, DL, II, ResultReg);
+ BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II, ResultReg);
return ResultReg;
}
unsigned FastISel::FastEmitInst_r(unsigned MachineInstOpcode,
const TargetRegisterClass *RC,
- unsigned Op0) {
+ unsigned Op0, bool Op0IsKill) {
unsigned ResultReg = createResultReg(RC);
- const TargetInstrDesc &II = TII.get(MachineInstOpcode);
+ const MCInstrDesc &II = TII.get(MachineInstOpcode);
if (II.getNumDefs() >= 1)
- BuildMI(MBB, DL, II, ResultReg).addReg(Op0);
+ BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II, ResultReg)
+ .addReg(Op0, Op0IsKill * RegState::Kill);
else {
- BuildMI(MBB, DL, II).addReg(Op0);
- bool InsertedCopy = TII.copyRegToReg(*MBB, MBB->end(), ResultReg,
- II.ImplicitDefs[0], RC, RC);
- if (!InsertedCopy)
- ResultReg = 0;
+ BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II)
+ .addReg(Op0, Op0IsKill * RegState::Kill);
+ BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(TargetOpcode::COPY),
+ ResultReg).addReg(II.ImplicitDefs[0]);
}
return ResultReg;
unsigned FastISel::FastEmitInst_rr(unsigned MachineInstOpcode,
const TargetRegisterClass *RC,
- unsigned Op0, unsigned Op1) {
+ unsigned Op0, bool Op0IsKill,
+ unsigned Op1, bool Op1IsKill) {
unsigned ResultReg = createResultReg(RC);
- const TargetInstrDesc &II = TII.get(MachineInstOpcode);
+ const MCInstrDesc &II = TII.get(MachineInstOpcode);
if (II.getNumDefs() >= 1)
- BuildMI(MBB, DL, II, ResultReg).addReg(Op0).addReg(Op1);
+ BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II, ResultReg)
+ .addReg(Op0, Op0IsKill * RegState::Kill)
+ .addReg(Op1, Op1IsKill * RegState::Kill);
else {
- BuildMI(MBB, DL, II).addReg(Op0).addReg(Op1);
- bool InsertedCopy = TII.copyRegToReg(*MBB, MBB->end(), ResultReg,
- II.ImplicitDefs[0], RC, RC);
- if (!InsertedCopy)
- ResultReg = 0;
+ BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II)
+ .addReg(Op0, Op0IsKill * RegState::Kill)
+ .addReg(Op1, Op1IsKill * RegState::Kill);
+ BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(TargetOpcode::COPY),
+ ResultReg).addReg(II.ImplicitDefs[0]);
+ }
+ return ResultReg;
+}
+
+unsigned FastISel::FastEmitInst_rrr(unsigned MachineInstOpcode,
+ const TargetRegisterClass *RC,
+ unsigned Op0, bool Op0IsKill,
+ unsigned Op1, bool Op1IsKill,
+ unsigned Op2, bool Op2IsKill) {
+ unsigned ResultReg = createResultReg(RC);
+ const MCInstrDesc &II = TII.get(MachineInstOpcode);
+
+ if (II.getNumDefs() >= 1)
+ BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II, ResultReg)
+ .addReg(Op0, Op0IsKill * RegState::Kill)
+ .addReg(Op1, Op1IsKill * RegState::Kill)
+ .addReg(Op2, Op2IsKill * RegState::Kill);
+ else {
+ BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II)
+ .addReg(Op0, Op0IsKill * RegState::Kill)
+ .addReg(Op1, Op1IsKill * RegState::Kill)
+ .addReg(Op2, Op2IsKill * RegState::Kill);
+ BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(TargetOpcode::COPY),
+ ResultReg).addReg(II.ImplicitDefs[0]);
}
return ResultReg;
}
unsigned FastISel::FastEmitInst_ri(unsigned MachineInstOpcode,
const TargetRegisterClass *RC,
- unsigned Op0, uint64_t Imm) {
+ unsigned Op0, bool Op0IsKill,
+ uint64_t Imm) {
+ unsigned ResultReg = createResultReg(RC);
+ const MCInstrDesc &II = TII.get(MachineInstOpcode);
+
+ if (II.getNumDefs() >= 1)
+ BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II, ResultReg)
+ .addReg(Op0, Op0IsKill * RegState::Kill)
+ .addImm(Imm);
+ else {
+ BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II)
+ .addReg(Op0, Op0IsKill * RegState::Kill)
+ .addImm(Imm);
+ BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(TargetOpcode::COPY),
+ ResultReg).addReg(II.ImplicitDefs[0]);
+ }
+ return ResultReg;
+}
+
+unsigned FastISel::FastEmitInst_rii(unsigned MachineInstOpcode,
+ const TargetRegisterClass *RC,
+ unsigned Op0, bool Op0IsKill,
+ uint64_t Imm1, uint64_t Imm2) {
unsigned ResultReg = createResultReg(RC);
- const TargetInstrDesc &II = TII.get(MachineInstOpcode);
+ const MCInstrDesc &II = TII.get(MachineInstOpcode);
if (II.getNumDefs() >= 1)
- BuildMI(MBB, DL, II, ResultReg).addReg(Op0).addImm(Imm);
+ BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II, ResultReg)
+ .addReg(Op0, Op0IsKill * RegState::Kill)
+ .addImm(Imm1)
+ .addImm(Imm2);
else {
- BuildMI(MBB, DL, II).addReg(Op0).addImm(Imm);
- bool InsertedCopy = TII.copyRegToReg(*MBB, MBB->end(), ResultReg,
- II.ImplicitDefs[0], RC, RC);
- if (!InsertedCopy)
- ResultReg = 0;
+ BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II)
+ .addReg(Op0, Op0IsKill * RegState::Kill)
+ .addImm(Imm1)
+ .addImm(Imm2);
+ BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(TargetOpcode::COPY),
+ ResultReg).addReg(II.ImplicitDefs[0]);
}
return ResultReg;
}
unsigned FastISel::FastEmitInst_rf(unsigned MachineInstOpcode,
const TargetRegisterClass *RC,
- unsigned Op0, ConstantFP *FPImm) {
+ unsigned Op0, bool Op0IsKill,
+ const ConstantFP *FPImm) {
unsigned ResultReg = createResultReg(RC);
- const TargetInstrDesc &II = TII.get(MachineInstOpcode);
+ const MCInstrDesc &II = TII.get(MachineInstOpcode);
if (II.getNumDefs() >= 1)
- BuildMI(MBB, DL, II, ResultReg).addReg(Op0).addFPImm(FPImm);
+ BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II, ResultReg)
+ .addReg(Op0, Op0IsKill * RegState::Kill)
+ .addFPImm(FPImm);
else {
- BuildMI(MBB, DL, II).addReg(Op0).addFPImm(FPImm);
- bool InsertedCopy = TII.copyRegToReg(*MBB, MBB->end(), ResultReg,
- II.ImplicitDefs[0], RC, RC);
- if (!InsertedCopy)
- ResultReg = 0;
+ BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II)
+ .addReg(Op0, Op0IsKill * RegState::Kill)
+ .addFPImm(FPImm);
+ BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(TargetOpcode::COPY),
+ ResultReg).addReg(II.ImplicitDefs[0]);
}
return ResultReg;
}
unsigned FastISel::FastEmitInst_rri(unsigned MachineInstOpcode,
const TargetRegisterClass *RC,
- unsigned Op0, unsigned Op1, uint64_t Imm) {
+ unsigned Op0, bool Op0IsKill,
+ unsigned Op1, bool Op1IsKill,
+ uint64_t Imm) {
unsigned ResultReg = createResultReg(RC);
- const TargetInstrDesc &II = TII.get(MachineInstOpcode);
+ const MCInstrDesc &II = TII.get(MachineInstOpcode);
if (II.getNumDefs() >= 1)
- BuildMI(MBB, DL, II, ResultReg).addReg(Op0).addReg(Op1).addImm(Imm);
+ BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II, ResultReg)
+ .addReg(Op0, Op0IsKill * RegState::Kill)
+ .addReg(Op1, Op1IsKill * RegState::Kill)
+ .addImm(Imm);
else {
- BuildMI(MBB, DL, II).addReg(Op0).addReg(Op1).addImm(Imm);
- bool InsertedCopy = TII.copyRegToReg(*MBB, MBB->end(), ResultReg,
- II.ImplicitDefs[0], RC, RC);
- if (!InsertedCopy)
- ResultReg = 0;
+ BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II)
+ .addReg(Op0, Op0IsKill * RegState::Kill)
+ .addReg(Op1, Op1IsKill * RegState::Kill)
+ .addImm(Imm);
+ BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(TargetOpcode::COPY),
+ ResultReg).addReg(II.ImplicitDefs[0]);
}
return ResultReg;
}
const TargetRegisterClass *RC,
uint64_t Imm) {
unsigned ResultReg = createResultReg(RC);
- const TargetInstrDesc &II = TII.get(MachineInstOpcode);
-
+ const MCInstrDesc &II = TII.get(MachineInstOpcode);
+
if (II.getNumDefs() >= 1)
- BuildMI(MBB, DL, II, ResultReg).addImm(Imm);
+ BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II, ResultReg).addImm(Imm);
else {
- BuildMI(MBB, DL, II).addImm(Imm);
- bool InsertedCopy = TII.copyRegToReg(*MBB, MBB->end(), ResultReg,
- II.ImplicitDefs[0], RC, RC);
- if (!InsertedCopy)
- ResultReg = 0;
+ BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II).addImm(Imm);
+ BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(TargetOpcode::COPY),
+ ResultReg).addReg(II.ImplicitDefs[0]);
}
return ResultReg;
}
-unsigned FastISel::FastEmitInst_extractsubreg(MVT::SimpleValueType RetVT,
- unsigned Op0, uint32_t Idx) {
- const TargetRegisterClass* RC = MRI.getRegClass(Op0);
-
- unsigned ResultReg = createResultReg(TLI.getRegClassFor(RetVT));
- const TargetInstrDesc &II = TII.get(TargetInstrInfo::EXTRACT_SUBREG);
-
+unsigned FastISel::FastEmitInst_ii(unsigned MachineInstOpcode,
+ const TargetRegisterClass *RC,
+ uint64_t Imm1, uint64_t Imm2) {
+ unsigned ResultReg = createResultReg(RC);
+ const MCInstrDesc &II = TII.get(MachineInstOpcode);
+
if (II.getNumDefs() >= 1)
- BuildMI(MBB, DL, II, ResultReg).addReg(Op0).addImm(Idx);
+ BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II, ResultReg)
+ .addImm(Imm1).addImm(Imm2);
else {
- BuildMI(MBB, DL, II).addReg(Op0).addImm(Idx);
- bool InsertedCopy = TII.copyRegToReg(*MBB, MBB->end(), ResultReg,
- II.ImplicitDefs[0], RC, RC);
- if (!InsertedCopy)
- ResultReg = 0;
+ BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II).addImm(Imm1).addImm(Imm2);
+ BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(TargetOpcode::COPY),
+ ResultReg).addReg(II.ImplicitDefs[0]);
}
return ResultReg;
}
+unsigned FastISel::FastEmitInst_extractsubreg(MVT RetVT,
+ unsigned Op0, bool Op0IsKill,
+ uint32_t Idx) {
+ unsigned ResultReg = createResultReg(TLI.getRegClassFor(RetVT));
+ assert(TargetRegisterInfo::isVirtualRegister(Op0) &&
+ "Cannot yet extract from physregs");
+ BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt,
+ DL, TII.get(TargetOpcode::COPY), ResultReg)
+ .addReg(Op0, getKillRegState(Op0IsKill), Idx);
+ return ResultReg;
+}
+
/// FastEmitZExtFromI1 - Emit MachineInstrs to compute the value of Op
/// with all but the least significant bit set to zero.
-unsigned FastISel::FastEmitZExtFromI1(MVT::SimpleValueType VT, unsigned Op) {
- return FastEmit_ri(VT, VT, ISD::AND, Op, 1);
+unsigned FastISel::FastEmitZExtFromI1(MVT VT, unsigned Op0, bool Op0IsKill) {
+ return FastEmit_ri(VT, VT, ISD::AND, Op0, Op0IsKill, 1);
+}
+
+/// HandlePHINodesInSuccessorBlocks - Handle PHI nodes in successor blocks.
+/// Emit code to ensure constants are copied into registers when needed.
+/// Remember the virtual registers that need to be added to the Machine PHI
+/// nodes as input. We cannot just directly add them, because expansion
+/// might result in multiple MBB's for one BB. As such, the start of the
+/// BB might correspond to a different MBB than the end.
+bool FastISel::HandlePHINodesInSuccessorBlocks(const BasicBlock *LLVMBB) {
+ const TerminatorInst *TI = LLVMBB->getTerminator();
+
+ SmallPtrSet<MachineBasicBlock *, 4> SuccsHandled;
+ unsigned OrigNumPHINodesToUpdate = FuncInfo.PHINodesToUpdate.size();
+
+ // Check successor nodes' PHI nodes that expect a constant to be available
+ // from this block.
+ for (unsigned succ = 0, e = TI->getNumSuccessors(); succ != e; ++succ) {
+ const BasicBlock *SuccBB = TI->getSuccessor(succ);
+ if (!isa<PHINode>(SuccBB->begin())) continue;
+ MachineBasicBlock *SuccMBB = FuncInfo.MBBMap[SuccBB];
+
+ // If this terminator has multiple identical successors (common for
+ // switches), only handle each succ once.
+ if (!SuccsHandled.insert(SuccMBB)) continue;
+
+ MachineBasicBlock::iterator MBBI = SuccMBB->begin();
+
+ // At this point we know that there is a 1-1 correspondence between LLVM PHI
+ // nodes and Machine PHI nodes, but the incoming operands have not been
+ // emitted yet.
+ for (BasicBlock::const_iterator I = SuccBB->begin();
+ const PHINode *PN = dyn_cast<PHINode>(I); ++I) {
+
+ // Ignore dead phi's.
+ if (PN->use_empty()) continue;
+
+ // Only handle legal types. Two interesting things to note here. First,
+ // by bailing out early, we may leave behind some dead instructions,
+ // since SelectionDAG's HandlePHINodesInSuccessorBlocks will insert its
+ // own moves. Second, this check is necessary because FastISel doesn't
+ // use CreateRegs to create registers, so it always creates
+ // exactly one register for each non-void instruction.
+ EVT VT = TLI.getValueType(PN->getType(), /*AllowUnknown=*/true);
+ if (VT == MVT::Other || !TLI.isTypeLegal(VT)) {
+ // Handle integer promotions, though, because they're common and easy.
+ if (VT == MVT::i1 || VT == MVT::i8 || VT == MVT::i16)
+ VT = TLI.getTypeToTransformTo(LLVMBB->getContext(), VT);
+ else {
+ FuncInfo.PHINodesToUpdate.resize(OrigNumPHINodesToUpdate);
+ return false;
+ }
+ }
+
+ const Value *PHIOp = PN->getIncomingValueForBlock(LLVMBB);
+
+ // Set the DebugLoc for the copy. Prefer the location of the operand
+ // if there is one; use the location of the PHI otherwise.
+ DL = PN->getDebugLoc();
+ if (const Instruction *Inst = dyn_cast<Instruction>(PHIOp))
+ DL = Inst->getDebugLoc();
+
+ unsigned Reg = getRegForValue(PHIOp);
+ if (Reg == 0) {
+ FuncInfo.PHINodesToUpdate.resize(OrigNumPHINodesToUpdate);
+ return false;
+ }
+ FuncInfo.PHINodesToUpdate.push_back(std::make_pair(MBBI++, Reg));
+ DL = DebugLoc();
+ }
+ }
+
+ return true;
}
projects / oota-llvm.git / blobdiff