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Diffstat (limited to 'lib/Target/Sparc/SparcV8ISelSimple.cpp')
| -rw-r--r-- | lib/Target/Sparc/SparcV8ISelSimple.cpp | 1823 |
1 files changed, 0 insertions, 1823 deletions
diff --git a/lib/Target/Sparc/SparcV8ISelSimple.cpp b/lib/Target/Sparc/SparcV8ISelSimple.cpp deleted file mode 100644 index f10859d5b9..0000000000 --- a/lib/Target/Sparc/SparcV8ISelSimple.cpp +++ /dev/null @@ -1,1823 +0,0 @@ -//===-- InstSelectSimple.cpp - A simple instruction selector for SparcV8 --===// -// -// The LLVM Compiler Infrastructure -// -// This file was developed by the LLVM research group and is distributed under -// the University of Illinois Open Source License. See LICENSE.TXT for details. -// -//===----------------------------------------------------------------------===// -// -// This file defines a simple peephole instruction selector for the V8 target -// -//===----------------------------------------------------------------------===// - -#include "SparcV8.h" -#include "SparcV8InstrInfo.h" -#include "llvm/Support/Debug.h" -#include "llvm/Instructions.h" -#include "llvm/Pass.h" -#include "llvm/Constants.h" -#include "llvm/DerivedTypes.h" -#include "llvm/CodeGen/IntrinsicLowering.h" -#include "llvm/CodeGen/MachineInstrBuilder.h" -#include "llvm/CodeGen/MachineFrameInfo.h" -#include "llvm/CodeGen/MachineConstantPool.h" -#include "llvm/CodeGen/MachineFunction.h" -#include "llvm/CodeGen/SSARegMap.h" -#include "llvm/Target/TargetMachine.h" -#include "llvm/Support/InstVisitor.h" -#include "llvm/Support/CFG.h" -#include <iostream> -using namespace llvm; - -namespace { - struct V8ISel : public FunctionPass, public InstVisitor<V8ISel> { - TargetMachine &TM; - MachineFunction *F; // The function we are compiling into - MachineBasicBlock *BB; // The current MBB we are compiling - int VarArgsOffset; // Offset from fp for start of varargs area - - std::map<Value*, unsigned> RegMap; // Mapping between Val's and SSA Regs - - // MBBMap - Mapping between LLVM BB -> Machine BB - std::map<const BasicBlock*, MachineBasicBlock*> MBBMap; - - V8ISel(TargetMachine &tm) : TM(tm), F(0), BB(0) {} - - /// runOnFunction - Top level implementation of instruction selection for - /// the entire function. - /// - bool runOnFunction(Function &Fn); - - virtual const char *getPassName() const { - return "SparcV8 Simple Instruction Selection"; - } - - /// emitGEPOperation - Common code shared between visitGetElementPtrInst and - /// constant expression GEP support. - /// - void emitGEPOperation(MachineBasicBlock *BB, MachineBasicBlock::iterator IP, - Value *Src, User::op_iterator IdxBegin, - User::op_iterator IdxEnd, unsigned TargetReg); - - /// emitCastOperation - Common code shared between visitCastInst and - /// constant expression cast support. - /// - void emitCastOperation(MachineBasicBlock *BB,MachineBasicBlock::iterator IP, - Value *Src, const Type *DestTy, unsigned TargetReg); - - /// emitIntegerCast, emitFPToIntegerCast - Helper methods for - /// emitCastOperation. - /// - unsigned emitIntegerCast (MachineBasicBlock *BB, - MachineBasicBlock::iterator IP, - const Type *oldTy, unsigned SrcReg, - const Type *newTy, unsigned DestReg, - bool castToLong = false); - void emitFPToIntegerCast (MachineBasicBlock *BB, - MachineBasicBlock::iterator IP, const Type *oldTy, - unsigned SrcReg, const Type *newTy, - unsigned DestReg); - - /// visitBasicBlock - This method is called when we are visiting a new basic - /// block. This simply creates a new MachineBasicBlock to emit code into - /// and adds it to the current MachineFunction. Subsequent visit* for - /// instructions will be invoked for all instructions in the basic block. - /// - void visitBasicBlock(BasicBlock &LLVM_BB) { - BB = MBBMap[&LLVM_BB]; - } - - void emitOp64LibraryCall (MachineBasicBlock *MBB, - MachineBasicBlock::iterator IP, - unsigned DestReg, const char *FuncName, - unsigned Op0Reg, unsigned Op1Reg); - void emitShift64 (MachineBasicBlock *MBB, MachineBasicBlock::iterator IP, - Instruction &I, unsigned DestReg, unsigned Op0Reg, - unsigned Op1Reg); - void visitBinaryOperator(Instruction &I); - void visitShiftInst (ShiftInst &SI) { visitBinaryOperator (SI); } - void visitSetCondInst(SetCondInst &I); - void visitCallInst(CallInst &I); - void visitReturnInst(ReturnInst &I); - void visitBranchInst(BranchInst &I); - void visitUnreachableInst(UnreachableInst &I) {} - void visitCastInst(CastInst &I); - void visitVAArgInst(VAArgInst &I); - void visitLoadInst(LoadInst &I); - void visitStoreInst(StoreInst &I); - void visitPHINode(PHINode &I) {} // PHI nodes handled by second pass - void visitGetElementPtrInst(GetElementPtrInst &I); - void visitAllocaInst(AllocaInst &I); - - void visitInstruction(Instruction &I) { - std::cerr << "Unhandled instruction: " << I; - abort(); - } - - /// LowerUnknownIntrinsicFunctionCalls - This performs a prepass over the - /// function, lowering any calls to unknown intrinsic functions into the - /// equivalent LLVM code. - void LowerUnknownIntrinsicFunctionCalls(Function &F); - void visitIntrinsicCall(Intrinsic::ID ID, CallInst &CI); - - void LoadArgumentsToVirtualRegs(Function *F); - - /// SelectPHINodes - Insert machine code to generate phis. This is tricky - /// because we have to generate our sources into the source basic blocks, - /// not the current one. - /// - void SelectPHINodes(); - - /// copyConstantToRegister - Output the instructions required to put the - /// specified constant into the specified register. - /// - void copyConstantToRegister(MachineBasicBlock *MBB, - MachineBasicBlock::iterator IP, - Constant *C, unsigned R); - - /// makeAnotherReg - This method returns the next register number we haven't - /// yet used. - /// - /// Long values are handled somewhat specially. They are always allocated - /// as pairs of 32 bit integer values. The register number returned is the - /// lower 32 bits of the long value, and the regNum+1 is the upper 32 bits - /// of the long value. - /// - unsigned makeAnotherReg(const Type *Ty) { - assert(dynamic_cast<const SparcV8RegisterInfo*>(TM.getRegisterInfo()) && - "Current target doesn't have SparcV8 reg info??"); - const SparcV8RegisterInfo *MRI = - static_cast<const SparcV8RegisterInfo*>(TM.getRegisterInfo()); - if (Ty == Type::LongTy || Ty == Type::ULongTy) { - const TargetRegisterClass *RC = MRI->getRegClassForType(Type::IntTy); - // Create the lower part - F->getSSARegMap()->createVirtualRegister(RC); - // Create the upper part. - return F->getSSARegMap()->createVirtualRegister(RC)-1; - } - - // Add the mapping of regnumber => reg class to MachineFunction - const TargetRegisterClass *RC = MRI->getRegClassForType(Ty); - return F->getSSARegMap()->createVirtualRegister(RC); - } - - unsigned getReg(Value &V) { return getReg (&V); } // allow refs. - unsigned getReg(Value *V) { - // Just append to the end of the current bb. - MachineBasicBlock::iterator It = BB->end(); - return getReg(V, BB, It); - } - unsigned getReg(Value *V, MachineBasicBlock *MBB, - MachineBasicBlock::iterator IPt) { - unsigned &Reg = RegMap[V]; - if (Reg == 0) { - Reg = makeAnotherReg(V->getType()); - RegMap[V] = Reg; - } - // If this operand is a constant, emit the code to copy the constant into - // the register here... - // - if (Constant *C = dyn_cast<Constant>(V)) { - copyConstantToRegister(MBB, IPt, C, Reg); - RegMap.erase(V); // Assign a new name to this constant if ref'd again - } else if (GlobalValue *GV = dyn_cast<GlobalValue>(V)) { - // Move the address of the global into the register - unsigned TmpReg = makeAnotherReg(V->getType()); - BuildMI (*MBB, IPt, V8::SETHIi, 1, TmpReg).addGlobalAddress (GV); - BuildMI (*MBB, IPt, V8::ORri, 2, Reg).addReg (TmpReg) - .addGlobalAddress (GV); - RegMap.erase(V); // Assign a new name to this address if ref'd again - } - - return Reg; - } - - }; -} - -FunctionPass *llvm::createSparcV8SimpleInstructionSelector(TargetMachine &TM) { - return new V8ISel(TM); -} - -enum TypeClass { - cByte, cShort, cInt, cLong, cFloat, cDouble -}; - -static TypeClass getClass (const Type *T) { - switch (T->getTypeID()) { - case Type::UByteTyID: case Type::SByteTyID: return cByte; - case Type::UShortTyID: case Type::ShortTyID: return cShort; - case Type::PointerTyID: - case Type::UIntTyID: case Type::IntTyID: return cInt; - case Type::ULongTyID: case Type::LongTyID: return cLong; - case Type::FloatTyID: return cFloat; - case Type::DoubleTyID: return cDouble; - default: - assert (0 && "Type of unknown class passed to getClass?"); - return cByte; - } -} - -static TypeClass getClassB(const Type *T) { - if (T == Type::BoolTy) return cByte; - return getClass(T); -} - -/// copyConstantToRegister - Output the instructions required to put the -/// specified constant into the specified register. -/// -void V8ISel::copyConstantToRegister(MachineBasicBlock *MBB, - MachineBasicBlock::iterator IP, - Constant *C, unsigned R) { - if (ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) { - switch (CE->getOpcode()) { - case Instruction::GetElementPtr: - emitGEPOperation(MBB, IP, CE->getOperand(0), - CE->op_begin()+1, CE->op_end(), R); - return; - case Instruction::Cast: - emitCastOperation(MBB, IP, CE->getOperand(0), CE->getType(), R); - return; - default: - std::cerr << "Copying this constant expr not yet handled: " << *CE; - abort(); - } - } else if (isa<UndefValue>(C)) { - BuildMI(*MBB, IP, V8::IMPLICIT_DEF_Int, 0, R); - if (getClassB (C->getType ()) == cLong) - BuildMI(*MBB, IP, V8::IMPLICIT_DEF_Int, 0, R+1); - return; - } - - if (C->getType()->isIntegral ()) { - unsigned Class = getClassB (C->getType ()); - if (Class == cLong) { - unsigned TmpReg = makeAnotherReg (Type::IntTy); - unsigned TmpReg2 = makeAnotherReg (Type::IntTy); - // Copy the value into the register pair. - // R = top(more-significant) half, R+1 = bottom(less-significant) half - uint64_t Val = cast<ConstantInt>(C)->getRawValue(); - copyConstantToRegister(MBB, IP, ConstantUInt::get(Type::UIntTy, - Val >> 32), R); - copyConstantToRegister(MBB, IP, ConstantUInt::get(Type::UIntTy, - Val & 0xffffffffU), R+1); - return; - } - - assert(Class <= cInt && "Type not handled yet!"); - unsigned Val; - - if (C->getType() == Type::BoolTy) { - Val = (C == ConstantBool::True); - } else { - ConstantIntegral *CI = cast<ConstantIntegral> (C); - Val = CI->getRawValue(); - } - if (C->getType()->isSigned()) { - switch (Class) { - case cByte: Val = (int8_t) Val; break; - case cShort: Val = (int16_t) Val; break; - case cInt: Val = (int32_t) Val; break; - } - } else { - switch (Class) { - case cByte: Val = (uint8_t) Val; break; - case cShort: Val = (uint16_t) Val; break; - case cInt: Val = (uint32_t) Val; break; - } - } - if (Val == 0) { - BuildMI (*MBB, IP, V8::ORrr, 2, R).addReg (V8::G0).addReg(V8::G0); - } else if ((int)Val >= -4096 && (int)Val <= 4095) { - BuildMI (*MBB, IP, V8::ORri, 2, R).addReg (V8::G0).addSImm(Val); - } else { - unsigned TmpReg = makeAnotherReg (C->getType ()); - BuildMI (*MBB, IP, V8::SETHIi, 1, TmpReg) - .addSImm (((uint32_t) Val) >> 10); - BuildMI (*MBB, IP, V8::ORri, 2, R).addReg (TmpReg) - .addSImm (((uint32_t) Val) & 0x03ff); - return; - } - } else if (ConstantFP *CFP = dyn_cast<ConstantFP>(C)) { - // We need to spill the constant to memory... - MachineConstantPool *CP = F->getConstantPool(); - unsigned CPI = CP->getConstantPoolIndex(CFP); - const Type *Ty = CFP->getType(); - unsigned TmpReg = makeAnotherReg (Type::UIntTy); - unsigned AddrReg = makeAnotherReg (Type::UIntTy); - - assert(Ty == Type::FloatTy || Ty == Type::DoubleTy && "Unknown FP type!"); - unsigned LoadOpcode = Ty == Type::FloatTy ? V8::LDFri : V8::LDDFri; - BuildMI (*MBB, IP, V8::SETHIi, 1, TmpReg).addConstantPoolIndex (CPI); - BuildMI (*MBB, IP, V8::ORri, 2, AddrReg).addReg (TmpReg) - .addConstantPoolIndex (CPI); - BuildMI (*MBB, IP, LoadOpcode, 2, R).addReg (AddrReg).addSImm (0); - } else if (isa<ConstantPointerNull>(C)) { - // Copy zero (null pointer) to the register. - BuildMI (*MBB, IP, V8::ORri, 2, R).addReg (V8::G0).addSImm (0); - } else if (GlobalValue *GV = dyn_cast<GlobalValue>(C)) { - // Copy it with a SETHI/OR pair; the JIT + asmwriter should recognize - // that SETHI %reg,global == SETHI %reg,%hi(global) and - // OR %reg,global,%reg == OR %reg,%lo(global),%reg. - unsigned TmpReg = makeAnotherReg (C->getType ()); - BuildMI (*MBB, IP, V8::SETHIi, 1, TmpReg).addGlobalAddress(GV); - BuildMI (*MBB, IP, V8::ORri, 2, R).addReg(TmpReg).addGlobalAddress(GV); - } else { - std::cerr << "Offending constant: " << *C << "\n"; - assert (0 && "Can't copy this kind of constant into register yet"); - } -} - -void V8ISel::LoadArgumentsToVirtualRegs (Function *LF) { - static const unsigned IncomingArgRegs[] = { V8::I0, V8::I1, V8::I2, - V8::I3, V8::I4, V8::I5 }; - - // Add IMPLICIT_DEFs of input regs. - unsigned ArgNo = 0; - for (Function::arg_iterator I = LF->arg_begin(), E = LF->arg_end(); - I != E && ArgNo < 6; ++I, ++ArgNo) { - switch (getClassB(I->getType())) { - case cByte: - case cShort: - case cInt: - case cFloat: - BuildMI(BB, V8::IMPLICIT_DEF_Int, 0, IncomingArgRegs[ArgNo]); - break; - case cDouble: - case cLong: - // Double and Long use register pairs. - BuildMI(BB, V8::IMPLICIT_DEF_Int, 0, IncomingArgRegs[ArgNo]); - ++ArgNo; - if (ArgNo < 6) - BuildMI(BB, V8::IMPLICIT_DEF_Int, 0, IncomingArgRegs[ArgNo]); - break; - default: - assert (0 && "type not handled"); - return; - } - } - - const unsigned *IAREnd = &IncomingArgRegs[6]; - const unsigned *IAR = &IncomingArgRegs[0]; - unsigned ArgOffset = 68; - - // Store registers onto stack if this is a varargs function. - // FIXME: This doesn't really pertain to "loading arguments into - // virtual registers", so it's not clear that it really belongs here. - // FIXME: We could avoid storing any args onto the stack that don't - // need to be in memory, because they come before the ellipsis in the - // parameter list (and thus could never be accessed through va_arg). - if (LF->getFunctionType()->isVarArg()) { - for (unsigned i = 0; i < 6; ++i) { - int FI = F->getFrameInfo()->CreateFixedObject(4, ArgOffset); - assert (IAR != IAREnd - && "About to dereference past end of IncomingArgRegs"); - BuildMI (BB, V8::STri, 3).addFrameIndex (FI).addSImm (0).addReg (*IAR++); - ArgOffset += 4; - } - // Reset the pointers now that we're done. - ArgOffset = 68; - IAR = &IncomingArgRegs[0]; - } - - // Copy args out of their incoming hard regs or stack slots into virtual regs. - for (Function::arg_iterator I = LF->arg_begin(), E = LF->arg_end(); I != E; ++I) { - Argument &A = *I; - unsigned ArgReg = getReg (A); - if (getClassB (A.getType ()) < cLong) { - // Get it out of the incoming arg register - if (ArgOffset < 92) { - assert (IAR != IAREnd - && "About to dereference past end of IncomingArgRegs"); - BuildMI (BB, V8::ORrr, 2, ArgReg).addReg (V8::G0).addReg (*IAR++); - } else { - int FI = F->getFrameInfo()->CreateFixedObject(4, ArgOffset); - BuildMI (BB, V8::LDri, 3, ArgReg).addFrameIndex (FI).addSImm (0); - } - ArgOffset += 4; - } else if (getClassB (A.getType ()) == cFloat) { - if (ArgOffset < 92) { - // Single-fp args are passed in integer registers; go through - // memory to get them out of integer registers and back into fp. (Bleh!) - unsigned FltAlign = TM.getTargetData().getFloatAlignment(); - int FI = F->getFrameInfo()->CreateStackObject(4, FltAlign); - assert (IAR != IAREnd - && "About to dereference past end of IncomingArgRegs"); - BuildMI (BB, V8::STri, 3).addFrameIndex (FI).addSImm (0).addReg (*IAR++); - BuildMI (BB, V8::LDFri, 2, ArgReg).addFrameIndex (FI).addSImm (0); - } else { - int FI = F->getFrameInfo()->CreateFixedObject(4, ArgOffset); - BuildMI (BB, V8::LDFri, 3, ArgReg).addFrameIndex (FI).addSImm (0); - } - ArgOffset += 4; - } else if (getClassB (A.getType ()) == cDouble) { - // Double-fp args are passed in pairs of integer registers; go through - // memory to get them out of integer registers and back into fp. (Bleh!) - // We'd like to 'ldd' these right out of the incoming-args area, - // but it might not be 8-byte aligned (e.g., call x(int x, double d)). - unsigned DblAlign = TM.getTargetData().getDoubleAlignment(); - int FI = F->getFrameInfo()->CreateStackObject(8, DblAlign); - if (ArgOffset < 92 && IAR != IAREnd) { - BuildMI (BB, V8::STri, 3).addFrameIndex (FI).addSImm (0).addReg (*IAR++); - } else { - unsigned TempReg = makeAnotherReg (Type::IntTy); - BuildMI (BB, V8::LDri, 2, TempReg).addFrameIndex (FI).addSImm (0); - BuildMI (BB, V8::STri, 3).addFrameIndex (FI).addSImm (0).addReg (TempReg); - } - ArgOffset += 4; - if (ArgOffset < 92 && IAR != IAREnd) { - BuildMI (BB, V8::STri, 3).addFrameIndex (FI).addSImm (4).addReg (*IAR++); - } else { - unsigned TempReg = makeAnotherReg (Type::IntTy); - BuildMI (BB, V8::LDri, 2, TempReg).addFrameIndex (FI).addSImm (4); - BuildMI (BB, V8::STri, 3).addFrameIndex (FI).addSImm (4).addReg (TempReg); - } - ArgOffset += 4; - BuildMI (BB, V8::LDDFri, 2, ArgReg).addFrameIndex (FI).addSImm (0); - } else if (getClassB (A.getType ()) == cLong) { - // do the first half... - if (ArgOffset < 92) { - assert (IAR != IAREnd - && "About to dereference past end of IncomingArgRegs"); - BuildMI (BB, V8::ORrr, 2, ArgReg).addReg (V8::G0).addReg (*IAR++); - } else { - int FI = F->getFrameInfo()->CreateFixedObject(4, ArgOffset); - BuildMI (BB, V8::LDri, 2, ArgReg).addFrameIndex (FI).addSImm (0); - } - ArgOffset += 4; - // ...then do the second half - if (ArgOffset < 92) { - assert (IAR != IAREnd - && "About to dereference past end of IncomingArgRegs"); - BuildMI (BB, V8::ORrr, 2, ArgReg+1).addReg (V8::G0).addReg (*IAR++); - } else { - int FI = F->getFrameInfo()->CreateFixedObject(4, ArgOffset); - BuildMI (BB, V8::LDri, 2, ArgReg+1).addFrameIndex (FI).addSImm (0); - } - ArgOffset += 4; - } else { - assert (0 && "Unknown class?!"); - } - } - - // If the function takes variable number of arguments, remember the fp - // offset for the start of the first vararg value... this is used to expand - // llvm.va_start. - if (LF->getFunctionType ()->isVarArg ()) - VarArgsOffset = ArgOffset; -} - -void V8ISel::SelectPHINodes() { - const TargetInstrInfo &TII = *TM.getInstrInfo(); - const Function &LF = *F->getFunction(); // The LLVM function... - for (Function::const_iterator I = LF.begin(), E = LF.end(); I != E; ++I) { - const BasicBlock *BB = I; - MachineBasicBlock &MBB = *MBBMap[I]; - - // Loop over all of the PHI nodes in the LLVM basic block... - MachineBasicBlock::iterator PHIInsertPoint = MBB.begin(); - for (BasicBlock::const_iterator I = BB->begin(); - PHINode *PN = const_cast<PHINode*>(dyn_cast<PHINode>(I)); ++I) { - - // Create a new machine instr PHI node, and insert it. - unsigned PHIReg = getReg(*PN); - MachineInstr *PhiMI = BuildMI(MBB, PHIInsertPoint, - V8::PHI, PN->getNumOperands(), PHIReg); - - MachineInstr *LongPhiMI = 0; - if (PN->getType() == Type::LongTy || PN->getType() == Type::ULongTy) - LongPhiMI = BuildMI(MBB, PHIInsertPoint, - V8::PHI, PN->getNumOperands(), PHIReg+1); - - // PHIValues - Map of blocks to incoming virtual registers. We use this - // so that we only initialize one incoming value for a particular block, - // even if the block has multiple entries in the PHI node. - // - std::map<MachineBasicBlock*, unsigned> PHIValues; - - for (unsigned i = 0, e = PN->getNumIncomingValues(); i != e; ++i) { - MachineBasicBlock *PredMBB = 0; - for (MachineBasicBlock::pred_iterator PI = MBB.pred_begin (), - PE = MBB.pred_end (); PI != PE; ++PI) - if (PN->getIncomingBlock(i) == (*PI)->getBasicBlock()) { - PredMBB = *PI; - break; - } - assert (PredMBB && "Couldn't find incoming machine-cfg edge for phi"); - - unsigned ValReg; - std::map<MachineBasicBlock*, unsigned>::iterator EntryIt = - PHIValues.lower_bound(PredMBB); - - if (EntryIt != PHIValues.end() && EntryIt->first == PredMBB) { - // We already inserted an initialization of the register for this - // predecessor. Recycle it. - ValReg = EntryIt->second; - - } else { - // Get the incoming value into a virtual register. - // - Value *Val = PN->getIncomingValue(i); - - // If this is a constant or GlobalValue, we may have to insert code - // into the basic block to compute it into a virtual register. - if ((isa<Constant>(Val) && !isa<ConstantExpr>(Val)) || - isa<GlobalValue>(Val)) { - // Simple constants get emitted at the end of the basic block, - // before any terminator instructions. We "know" that the code to - // move a constant into a register will never clobber any flags. - ValReg = getReg(Val, PredMBB, PredMBB->getFirstTerminator()); - } else { - // Because we don't want to clobber any values which might be in - // physical registers with the computation of this constant (which - // might be arbitrarily complex if it is a constant expression), - // just insert the computation at the top of the basic block. - MachineBasicBlock::iterator PI = PredMBB->begin(); - - // Skip over any PHI nodes though! - while (PI != PredMBB->end() && PI->getOpcode() == V8::PHI) - ++PI; - - ValReg = getReg(Val, PredMBB, PI); - } - - // Remember that we inserted a value for this PHI for this predecessor - PHIValues.insert(EntryIt, std::make_pair(PredMBB, ValReg)); - } - - PhiMI->addRegOperand(ValReg); - PhiMI->addMachineBasicBlockOperand(PredMBB); - if (LongPhiMI) { - LongPhiMI->addRegOperand(ValReg+1); - LongPhiMI->addMachineBasicBlockOperand(PredMBB); - } - } - - // Now that we emitted all of the incoming values for the PHI node, make - // sure to reposition the InsertPoint after the PHI that we just added. - // This is needed because we might have inserted a constant into this - // block, right after the PHI's which is before the old insert point! - PHIInsertPoint = LongPhiMI ? LongPhiMI : PhiMI; - ++PHIInsertPoint; - } - } -} - -bool V8ISel::runOnFunction(Function &Fn) { - // First pass over the function, lower any unknown intrinsic functions - // with the IntrinsicLowering class. - LowerUnknownIntrinsicFunctionCalls(Fn); - - F = &MachineFunction::construct(&Fn, TM); - - // Create all of the machine basic blocks for the function... - for (Function::iterator I = Fn.begin(), E = Fn.end(); I != E; ++I) - F->getBasicBlockList().push_back(MBBMap[I] = new MachineBasicBlock(I)); - - BB = &F->front(); - - // Set up a frame object for the return address. This is used by the - // llvm.returnaddress & llvm.frameaddress intrinisics. - //ReturnAddressIndex = F->getFrameInfo()->CreateFixedObject(4, -4); - - // Copy incoming arguments off of the stack and out of fixed registers. - LoadArgumentsToVirtualRegs(&Fn); - - // Instruction select everything except PHI nodes - visit(Fn); - - // Select the PHI nodes - SelectPHINodes(); - - RegMap.clear(); - MBBMap.clear(); - F = 0; - // We always build a machine code representation for the function - return true; -} - -void V8ISel::visitCastInst(CastInst &I) { - Value *Op = I.getOperand(0); - unsigned DestReg = getReg(I); - MachineBasicBlock::iterator MI = BB->end(); - emitCastOperation(BB, MI, Op, I.getType(), DestReg); -} - -unsigned V8ISel::emitIntegerCast (MachineBasicBlock *BB, - MachineBasicBlock::iterator IP, const Type *oldTy, - unsigned SrcReg, const Type *newTy, - unsigned DestReg, bool castToLong) { - unsigned shiftWidth = 32 - (8 * TM.getTargetData ().getTypeSize (newTy)); - if (oldTy == newTy || (!castToLong && shiftWidth == 0)) { - // No-op cast - just emit a copy; assume the reg. allocator will zap it. - BuildMI (*BB, IP, V8::ORrr, 2, DestReg).addReg (V8::G0).addReg(SrcReg); - return SrcReg; - } - // Emit left-shift, then right-shift to sign- or zero-extend. - unsigned TmpReg = makeAnotherReg (newTy); - BuildMI (*BB, IP, V8::SLLri, 2, TmpReg).addZImm (shiftWidth).addReg(SrcReg); - if (newTy->isSigned ()) { // sign-extend with SRA - BuildMI(*BB, IP, V8::SRAri, 2, DestReg).addZImm (shiftWidth).addReg(TmpReg); - } else { // zero-extend with SRL - BuildMI(*BB, IP, V8::SRLri, 2, DestReg).addZImm (shiftWidth).addReg(TmpReg); - } - // Return the temp reg. in case this is one half of a cast to long. - return TmpReg; -} - -void V8ISel::emitFPToIntegerCast (MachineBasicBlock *BB, - MachineBasicBlock::iterator IP, - const Type *oldTy, unsigned SrcReg, - const Type *newTy, unsigned DestReg) { - unsigned FPCastOpcode, FPStoreOpcode, FPSize, FPAlign; - unsigned oldTyClass = getClassB(oldTy); - if (oldTyClass == cFloat) { - FPCastOpcode = V8::FSTOI; FPStoreOpcode = V8::STFri; FPSize = 4; - FPAlign = TM.getTargetData().getFloatAlignment(); - } else { // it's a double - FPCastOpcode = V8::FDTOI; FPStoreOpcode = V8::STDFri; FPSize = 8; - FPAlign = TM.getTargetData().getDoubleAlignment(); - } - unsigned TempReg = makeAnotherReg (oldTy); - BuildMI (*BB, IP, FPCastOpcode, 1, TempReg).addReg (SrcReg); - int FI = F->getFrameInfo()->CreateStackObject(FPSize, FPAlign); - BuildMI (*BB, IP, FPStoreOpcode, 3).addFrameIndex (FI).addSImm (0) - .addReg (TempReg); - unsigned TempReg2 = makeAnotherReg (newTy); - BuildMI (*BB, IP, V8::LDri, 3, TempReg2).addFrameIndex (FI).addSImm (0); - emitIntegerCast (BB, IP, Type::IntTy, TempReg2, newTy, DestReg); -} - -/// emitCastOperation - Common code shared between visitCastInst and constant -/// expression cast support. -/// -void V8ISel::emitCastOperation(MachineBasicBlock *BB, - MachineBasicBlock::iterator IP, Value *Src, - const Type *DestTy, unsigned DestReg) { - const Type *SrcTy = Src->getType(); - unsigned SrcClass = getClassB(SrcTy); - unsigned DestClass = getClassB(DestTy); - unsigned SrcReg = getReg(Src, BB, IP); - - const Type *oldTy = SrcTy; - const Type *newTy = DestTy; - unsigned oldTyClass = SrcClass; - unsigned newTyClass = DestClass; - - if (oldTyClass < cLong && newTyClass < cLong) { - emitIntegerCast (BB, IP, oldTy, SrcReg, newTy, DestReg); - } else switch (newTyClass) { - case cByte: - case cShort: - case cInt: - switch (oldTyClass) { - case cLong: - // Treat it like a cast from the lower half of the value. - emitIntegerCast (BB, IP, Type::IntTy, SrcReg+1, newTy, DestReg); - break; - case cFloat: - case cDouble: - emitFPToIntegerCast (BB, IP, oldTy, SrcReg, newTy, DestReg); - break; - default: goto not_yet; - } - return; - - case cFloat: - switch (oldTyClass) { - case cLong: goto not_yet; - case cFloat: - BuildMI (*BB, IP, V8::FMOVS, 1, DestReg).addReg (SrcReg); - break; - case cDouble: - BuildMI (*BB, IP, V8::FDTOS, 1, DestReg).addReg (SrcReg); - break; - default: { - unsigned FltAlign = TM.getTargetData().getFloatAlignment(); - // cast integer type to float. Store it to a stack slot and then load - // it using ldf into a floating point register. then do fitos. - unsigned TmpReg = makeAnotherReg (newTy); - int FI = F->getFrameInfo()->CreateStackObject(4, FltAlign); - BuildMI (*BB, IP, V8::STri, 3).addFrameIndex (FI).addSImm (0) - .addReg (SrcReg); - BuildMI (*BB, IP, V8::LDFri, 2, TmpReg).addFrameIndex (FI).addSImm (0); - BuildMI (*BB, IP, V8::FITOS, 1, DestReg).addReg(TmpReg); - break; - } - } - return; - - case cDouble: - switch (oldTyClass) { - case cLong: goto not_yet; - case cFloat: - BuildMI (*BB, IP, V8::FSTOD, 1, DestReg).addReg (SrcReg); - break; - case cDouble: // use double move pseudo-instr - BuildMI (*BB, IP, V8::FpMOVD, 1, DestReg).addReg (SrcReg); - break; - default: { - unsigned DoubleAlignment = TM.getTargetData().getDoubleAlignment(); - unsigned TmpReg = makeAnotherReg (newTy); - int FI = F->getFrameInfo()->CreateStackObject(8, DoubleAlignment); - BuildMI (*BB, IP, V8::STri, 3).addFrameIndex (FI).addSImm (0) - .addReg (SrcReg); - BuildMI (*BB, IP, V8::LDDFri, 2, TmpReg).addFrameIndex (FI).addSImm (0); - BuildMI (*BB, IP, V8::FITOD, 1, DestReg).addReg(TmpReg); - break; - } - } - return; - - case cLong: - switch (oldTyClass) { - case cByte: - case cShort: - case cInt: { - // Cast to (u)int in the bottom half, and sign(zero) extend in the top - // half. - const Type *OldHalfTy = oldTy->isSigned() ? Type::IntTy : Type::UIntTy; - const Type *NewHalfTy = newTy->isSigned() ? Type::IntTy : Type::UIntTy; - unsigned TempReg = emitIntegerCast (BB, IP, OldHalfTy, SrcReg, - NewHalfTy, DestReg+1, true); - if (newTy->isSigned ()) { - BuildMI (*BB, IP, V8::SRAri, 2, DestReg).addReg (TempReg) - .addZImm (31); - } else { - BuildMI (*BB, IP, V8::ORrr, 2, DestReg).addReg (V8::G0) - .addReg (V8::G0); - } - break; - } - case cLong: - // Just copy both halves. - BuildMI (*BB, IP, V8::ORrr, 2, DestReg).addReg (V8::G0).addReg (SrcReg); - BuildMI (*BB, IP, V8::ORrr, 2, DestReg+1).addReg (V8::G0) - .addReg (SrcReg+1); - break; - default: goto not_yet; - } - return; - - default: goto not_yet; - } - return; -not_yet: - std::cerr << "Sorry, cast still unsupported: SrcTy = " << *SrcTy - << ", DestTy = " << *DestTy << "\n"; - abort (); -} - -void V8ISel::visitLoadInst(LoadInst &I) { - unsigned DestReg = getReg (I); - unsigned PtrReg = getReg (I.getOperand (0)); - switch (getClassB (I.getType ())) { - case cByte: - if (I.getType ()->isSigned ()) - BuildMI (BB, V8::LDSBri, 2, DestReg).addReg (PtrReg).addSImm(0); - else - BuildMI (BB, V8::LDUBri, 2, DestReg).addReg (PtrReg).addSImm(0); - return; - case cShort: - if (I.getType ()->isSigned ()) - BuildMI (BB, V8::LDSHri, 2, DestReg).addReg (PtrReg).addSImm(0); - else - BuildMI (BB, V8::LDUHri, 2, DestReg).addReg (PtrReg).addSImm(0); - return; - case cInt: - BuildMI (BB, V8::LDri, 2, DestReg).addReg (PtrReg).addSImm(0); - return; - case cLong: - BuildMI (BB, V8::LDri, 2, DestReg).addReg (PtrReg).addSImm(0); - BuildMI (BB, V8::LDri, 2, DestReg+1).addReg (PtrReg).addSImm(4); - return; - case cFloat: - BuildMI (BB, V8::LDFri, 2, DestReg).addReg (PtrReg).addSImm(0); - return; - case cDouble: - BuildMI (BB, V8::LDDFri, 2, DestReg).addReg (PtrReg).addSImm(0); - return; - default: - std::cerr << "Load instruction not handled: " << I; - abort (); - return; - } -} - -void V8ISel::visitStoreInst(StoreInst &I) { - Value *SrcVal = I.getOperand (0); - unsigned SrcReg = getReg (SrcVal); - unsigned PtrReg = getReg (I.getOperand (1)); - switch (getClassB (SrcVal->getType ())) { - case cByte: - BuildMI (BB, V8::STBri, 3).addReg (PtrReg).addSImm (0).addReg (SrcReg); - return; - case cShort: - BuildMI (BB, V8::STHri, 3).addReg (PtrReg).addSImm (0).addReg (SrcReg); - return; - case cInt: - BuildMI (BB, V8::STri, 3).addReg (PtrReg).addSImm (0).addReg (SrcReg); - return; - case cLong: - BuildMI (BB, V8::STri, 3).addReg (PtrReg).addSImm (0).addReg (SrcReg); - BuildMI (BB, V8::STri, 3).addReg (PtrReg).addSImm (4).addReg (SrcReg+1); - return; - case cFloat: - BuildMI (BB, V8::STFri, 3).addReg (PtrReg).addSImm (0).addReg (SrcReg); - return; - case cDouble: - BuildMI (BB, V8::STDFri, 3).addReg (PtrReg).addSImm (0).addReg (SrcReg); - return; - default: - std::cerr << "Store instruction not handled: " << I; - abort (); - return; - } -} - -void V8ISel::visitCallInst(CallInst &I) { - MachineInstr *TheCall; - // Is it an intrinsic function call? - if (Function *F = I.getCalledFunction()) { - if (Intrinsic::ID ID = (Intrinsic::ID)F->getIntrinsicID()) { - visitIntrinsicCall(ID, I); // Special intrinsics are not handled here - return; - } - } - - // How much extra call stack will we need? - int extraStack = 0; - for (unsigned i = 0; i < I.getNumOperands (); ++i) { - switch (getClassB (I.getOperand (i)->getType ())) { - case cLong: extraStack += 8; break; - case cFloat: extraStack += 4; break; - case cDouble: extraStack += 8; break; - default: extraStack += 4; break; - } - } - extraStack -= 24; - if (extraStack < 0) { - extraStack = 0; - } else { - // Round up extra stack size to the nearest doubleword. - extraStack = (extraStack + 7) & ~7; - } - - // Deal with args - static const unsigned OutgoingArgRegs[] = { V8::O0, V8::O1, V8::O2, V8::O3, - V8::O4, V8::O5 }; - const unsigned *OAREnd = &OutgoingArgRegs[6]; - const unsigned *OAR = &OutgoingArgRegs[0]; - unsigned ArgOffset = 68; - if (extraStack) BuildMI (BB, V8::ADJCALLSTACKDOWN, 1).addImm (extraStack); - for (unsigned i = 1; i < I.getNumOperands (); ++i) { - unsigned ArgReg = getReg (I.getOperand (i)); - if (getClassB (I.getOperand (i)->getType ()) < cLong) { - // Schlep it over into the incoming arg register - if (ArgOffset < 92) { - assert (OAR != OAREnd && - "About to dereference past end of OutgoingArgRegs"); - BuildMI (BB, V8::ORrr, 2, *OAR++).addReg (V8::G0).addReg (ArgReg); - } else { - BuildMI (BB, V8::STri, 3).addReg (V8::O6).addSImm (ArgOffset) - .addReg (ArgReg); - } - ArgOffset += 4; - } else if (getClassB (I.getOperand (i)->getType ()) == cFloat) { - if (ArgOffset < 92) { - // Single-fp args are passed in integer registers; go through - // memory to get them out of FP registers. (Bleh!) - unsigned FltAlign = TM.getTargetData().getFloatAlignment(); - int FI = F->getFrameInfo()->CreateStackObject(4, FltAlign); - BuildMI (BB, V8::STFri, 3).addFrameIndex(FI).addSImm(0).addReg(ArgReg); - assert (OAR != OAREnd && - "About to dereference past end of OutgoingArgRegs"); - BuildMI (BB, V8::LDri, 2, *OAR++).addFrameIndex (FI).addSImm (0); - } else { - BuildMI (BB, V8::STFri, 3).addReg (V8::O6).addSImm (ArgOffset) - .addReg (ArgReg); - } - ArgOffset += 4; - } else if (getClassB (I.getOperand (i)->getType ()) == cDouble) { - // Double-fp args are passed in pairs of integer registers; go through - // memory to get them out of FP registers. (Bleh!) - // We'd like to 'std' these right onto the outgoing-args area, but it might - // not be 8-byte aligned (e.g., call x(int x, double d)). sigh. - unsigned DblAlign = TM.getTargetData().getDoubleAlignment(); - int FI = F->getFrameInfo()->CreateStackObject(8, DblAlign); - BuildMI (BB, V8::STDFri, 3).addFrameIndex (FI).addSImm (0).addReg (ArgReg); |