+++ /dev/null
-//===-- 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/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/GetElementPtrTypeIterator.h"
-#include "llvm/Support/InstVisitor.h"
-#include "llvm/Support/CFG.h"
-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
-
- 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);
-
- /// 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 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 visitCastInst(CastInst &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();
- }
- }
-
- if (C->getType()->isIntegral ()) {
- uint64_t Val;
- 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();
- unsigned bottomHalf = Val & 0xffffffffU;
- unsigned topHalf = Val >> 32;
- unsigned HH = topHalf >> 10;
- unsigned HM = topHalf & 0x03ff;
- unsigned LM = bottomHalf >> 10;
- unsigned LO = bottomHalf & 0x03ff;
- BuildMI (*MBB, IP, V8::SETHIi, 1, TmpReg).addZImm(HH);
- BuildMI (*MBB, IP, V8::ORri, 2, R).addReg (TmpReg)
- .addSImm (HM);
- BuildMI (*MBB, IP, V8::SETHIi, 1, TmpReg2).addZImm(LM);
- BuildMI (*MBB, IP, V8::ORri, 2, R+1).addReg (TmpReg2)
- .addSImm (LO);
- return;
- }
-
- assert(Class <= cInt && "Type not handled yet!");
-
- if (C->getType() == Type::BoolTy) {
- Val = (C == ConstantBool::True);
- } else {
- ConstantInt *CI = cast<ConstantInt> (C);
- Val = CI->getRawValue ();
- }
- switch (Class) {
- case cByte: Val = (int8_t) Val; break;
- case cShort: Val = (int16_t) Val; break;
- case cInt: Val = (int32_t) Val; break;
- default:
- std::cerr << "Offending constant: " << *C << "\n";
- assert (0 && "Can't copy this kind of constant into register yet");
- return;
- }
- if (Val == 0) {
- BuildMI (*MBB, IP, V8::ORrr, 2, R).addReg (V8::G0).addReg(V8::G0);
- } else if (((int64_t)Val >= -4096) && ((int64_t)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();
-
- assert(Ty == Type::FloatTy || Ty == Type::DoubleTy && "Unknown FP type!");
- unsigned LoadOpcode = Ty == Type::FloatTy ? V8::LDFri : V8::LDDFri;
- BuildMI (*MBB, IP, LoadOpcode, 2, R).addConstantPoolIndex (CPI).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) {
- unsigned ArgOffset;
- static const unsigned IncomingArgRegs[] = { V8::I0, V8::I1, V8::I2,
- V8::I3, V8::I4, V8::I5 };
- assert (LF->asize () < 7
- && "Can't handle loading excess call args off the stack yet");
-
- // Add IMPLICIT_DEFs of input regs.
- ArgOffset = 0;
- for (Function::aiterator I = LF->abegin(), E = LF->aend(); I != E; ++I) {
- unsigned Reg = getReg(*I);
- switch (getClassB(I->getType())) {
- case cByte:
- case cShort:
- case cInt:
- case cFloat:
- BuildMI(BB, V8::IMPLICIT_DEF, 0, IncomingArgRegs[ArgOffset]);
- break;
- default:
- // FIXME: handle cDouble, cLong
- assert (0 && "64-bit (double, long, etc.) function args not handled");
- return;
- }
- ++ArgOffset;
- }
-
- ArgOffset = 0;
- for (Function::aiterator I = LF->abegin(), E = LF->aend(); I != E; ++I) {
- unsigned Reg = getReg(*I);
- switch (getClassB(I->getType())) {
- case cByte:
- case cShort:
- case cInt:
- BuildMI(BB, V8::ORrr, 2, Reg).addReg (V8::G0)
- .addReg (IncomingArgRegs[ArgOffset]);
- break;
- case cFloat: {
- // Single-fp args are passed in integer registers; go through
- // memory to get them into FP registers. (Bleh!)
- unsigned FltAlign = TM.getTargetData().getFloatAlignment();
- int FI = F->getFrameInfo()->CreateStackObject(4, FltAlign);
- BuildMI (BB, V8::ST, 3).addFrameIndex (FI).addSImm (0)
- .addReg (IncomingArgRegs[ArgOffset]);
- BuildMI (BB, V8::LDFri, 2, Reg).addFrameIndex (FI).addSImm (0);
- break;
- }
- default:
- // FIXME: handle cDouble, cLong
- assert (0 && "64-bit (double, long, etc.) function args not handled");
- return;
- }
- ++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);
-}
-
-/// 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) {
- if (oldTyClass >= newTyClass) {
- // Emit a reg->reg copy to do a equal-size or narrowing cast,
- // and do sign/zero extension (necessary if we change signedness).
- unsigned TmpReg1 = makeAnotherReg (newTy);
- unsigned TmpReg2 = makeAnotherReg (newTy);
- BuildMI (*BB, IP, V8::ORrr, 2, TmpReg1).addReg (V8::G0).addReg (SrcReg);
- unsigned shiftWidth = 32 - (8 * TM.getTargetData ().getTypeSize (newTy));
- BuildMI (*BB, IP, V8::SLLri, 2, TmpReg2).addZImm (shiftWidth).addReg(TmpReg1);
- if (newTy->isSigned ()) { // sign-extend with SRA
- BuildMI(*BB, IP, V8::SRAri, 2, DestReg).addZImm (shiftWidth).addReg(TmpReg2);
- } else { // zero-extend with SRL
- BuildMI(*BB, IP, V8::SRLri, 2, DestReg).addZImm (shiftWidth).addReg(TmpReg2);
- }
- } else {
- unsigned TmpReg1 = makeAnotherReg (oldTy);
- unsigned TmpReg2 = makeAnotherReg (newTy);
- unsigned TmpReg3 = makeAnotherReg (newTy);
- // Widening integer cast. Make sure it's fully sign/zero-extended
- // wrt the input type, then make sure it's fully sign/zero-extended wrt
- // the output type. Kind of stupid, but simple...
- unsigned shiftWidth = 32 - (8 * TM.getTargetData ().getTypeSize (oldTy));
- BuildMI (*BB, IP, V8::SLLri, 2, TmpReg1).addZImm (shiftWidth).addReg(SrcReg);
- if (oldTy->isSigned ()) { // sign-extend with SRA
- BuildMI(*BB, IP, V8::SRAri, 2, TmpReg2).addZImm (shiftWidth).addReg(TmpReg1);
- } else { // zero-extend with SRL
- BuildMI(*BB, IP, V8::SRLri, 2, TmpReg2).addZImm (shiftWidth).addReg(TmpReg1);
- }
- shiftWidth = 32 - (8 * TM.getTargetData ().getTypeSize (newTy));
- BuildMI (*BB, IP, V8::SLLri, 2, TmpReg3).addZImm (shiftWidth).addReg(TmpReg2);
- if (newTy->isSigned ()) { // sign-extend with SRA
- BuildMI(*BB, IP, V8::SRAri, 2, DestReg).addZImm (shiftWidth).addReg(TmpReg3);
- } else { // zero-extend with SRL
- BuildMI(*BB, IP, V8::SRLri, 2, DestReg).addZImm (shiftWidth).addReg(TmpReg3);
- }
- }
- } else {
- if (newTyClass == cFloat) {
- assert (oldTyClass != cLong && "cast long to float not implemented yet");
- switch (oldTyClass) {
- 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 int 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::ST, 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;
- }
- }
- } else if (newTyClass == cDouble) {
- assert (oldTyClass != cLong && "cast long to double not implemented yet");
- switch (oldTyClass) {
- case cFloat:
- BuildMI (*BB, IP, V8::FSTOD, 1, DestReg).addReg (SrcReg);
- break;
- case cDouble: {
- // go through memory, for now
- unsigned DoubleAlignment = TM.getTargetData().getDoubleAlignment();
- int FI = F->getFrameInfo()->CreateStackObject(8, DoubleAlignment);
- BuildMI (*BB, IP, V8::STDFri, 3).addFrameIndex (FI).addSImm (0)
- .addReg (SrcReg);
- BuildMI (*BB, IP, V8::LDDFri, 2, DestReg).addFrameIndex (FI)
- .addSImm (0);
- break;
- }
- default: {
- unsigned DoubleAlignment = TM.getTargetData().getDoubleAlignment();
- unsigned TmpReg = makeAnotherReg (newTy);
- int FI = F->getFrameInfo()->CreateStackObject(8, DoubleAlignment);
- BuildMI (*BB, IP, V8::ST, 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;
- }
- }
- } else if (newTyClass == cLong) {
- if (oldTyClass == cLong) {
- // Just copy it
- 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);
- } else {
- std::cerr << "Cast still unsupported: SrcTy = "
- << *SrcTy << ", DestTy = " << *DestTy << "\n";
- abort ();
- }
- } else {
- std::cerr << "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::LDSB, 2, DestReg).addReg (PtrReg).addSImm(0);
- else
- BuildMI (BB, V8::LDUB, 2, DestReg).addReg (PtrReg).addSImm(0);
- return;
- case cShort:
- if (I.getType ()->isSigned ())
- BuildMI (BB, V8::LDSH, 2, DestReg).addReg (PtrReg).addSImm(0);
- else
- BuildMI (BB, V8::LDUH, 2, DestReg).addReg (PtrReg).addSImm(0);
- return;
- case cInt:
- BuildMI (BB, V8::LD, 2, DestReg).addReg (PtrReg).addSImm(0);
- return;
- case cLong:
- BuildMI (BB, V8::LD, 2, DestReg).addReg (PtrReg).addSImm(0);
- BuildMI (BB, V8::LD, 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::STB, 3).addReg (PtrReg).addSImm (0).addReg (SrcReg);
- return;
- case cShort:
- BuildMI (BB, V8::STH, 3).addReg (PtrReg).addSImm (0).addReg (SrcReg);
- return;
- case cInt:
- BuildMI (BB, V8::ST, 3).addReg (PtrReg).addSImm (0).addReg (SrcReg);
- return;
- case cLong:
- BuildMI (BB, V8::ST, 3).addReg (PtrReg).addSImm (0).addReg (SrcReg);
- BuildMI (BB, V8::ST, 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;
- }
- }
-
- // Deal with args
- assert (I.getNumOperands () < 8
- && "Can't handle pushing excess call args on the stack yet");
- static const unsigned OutgoingArgRegs[] = { V8::O0, V8::O1, V8::O2, V8::O3,
- V8::O4, V8::O5 };
- for (unsigned i = 1; i < 7; ++i)
- if (i < I.getNumOperands ()) {
- unsigned ArgReg = getReg (I.getOperand (i));
- if (getClassB (I.getOperand (i)->getType ()) < cLong) {
- // Schlep it over into the incoming arg register
- BuildMI (BB, V8::ORrr, 2, OutgoingArgRegs[i - 1]).addReg (V8::G0)
- .addReg (ArgReg);
- } else if (getClassB (I.getOperand (i)->getType ()) == cFloat) {
- // 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);
- BuildMI (BB, V8::LD, 2, OutgoingArgRegs[i - 1]).addFrameIndex (FI)
- .addSImm (0);
- } else {
- assert (0 && "64-bit (double, long, etc.) 'call' opnds not handled");
- }
- }
-
- // Emit call instruction
- if (Function *F = I.getCalledFunction ()) {
- BuildMI (BB, V8::CALL, 1).addGlobalAddress (F, true);
- } else { // Emit an indirect call...
- unsigned Reg = getReg (I.getCalledValue ());
- BuildMI (BB, V8::JMPLrr, 3, V8::O7).addReg (Reg).addReg (V8::G0);
- }
-
- // Deal w/ return value: schlep it over into the destination register
- if (I.getType () == Type::VoidTy)
- return;
- unsigned DestReg = getReg (I);
- switch (getClass (I.getType ())) {
- case cByte:
- case cShort:
- case cInt:
- BuildMI (BB, V8::ORrr, 2, DestReg).addReg(V8::G0).addReg(V8::O0);
- break;
- case cFloat:
- BuildMI (BB, V8::FMOVS, 2, DestReg).addReg(V8::F0);
- break;
- default:
- std::cerr << "Return type of call instruction not handled: " << I;
- abort ();
- }
-}
-
-void V8ISel::visitReturnInst(ReturnInst &I) {
- if (I.getNumOperands () == 1) {
- unsigned RetValReg = getReg (I.getOperand (0));
- switch (getClass (I.getOperand (0)->getType ())) {
- case cByte:
- case cShort:
- case cInt:
- // Schlep it over into i0 (where it will become o0 after restore).
- BuildMI (BB, V8::ORrr, 2, V8::I0).addReg(V8::G0).addReg(RetValReg);
- break;
- case cFloat:
- BuildMI (BB, V8::FMOVS, 2, V8::F0).addReg(RetValReg);
- break;
- case cDouble: {
- unsigned DoubleAlignment = TM.getTargetData().getDoubleAlignment();
- int FI = F->getFrameInfo()->CreateStackObject(8, DoubleAlignment);
- BuildMI (BB, V8::STDFri, 3).addFrameIndex (FI).addSImm (0)
- .addReg (RetValReg);
- BuildMI (BB, V8::LDDFri, 2, V8::F0).addFrameIndex (FI).addSImm (0);
- break;
- }
- case cLong:
- BuildMI (BB, V8::ORrr, 2, V8::I0).addReg(V8::G0).addReg(RetValReg);
- BuildMI (BB, V8::ORrr, 2, V8::I1).addReg(V8::G0).addReg(RetValReg+1);
- break;
- default:
- std::cerr << "Return instruction of this type not handled: " << I;
- abort ();
- }
- }
-
- // Just emit a 'retl' instruction to return.
- BuildMI(BB, V8::RETL, 0);
- return;
-}
-
-static inline BasicBlock *getBlockAfter(BasicBlock *BB) {
- Function::iterator I = BB; ++I; // Get iterator to next block
- return I != BB->getParent()->end() ? &*I : 0;
-}
-
-/// visitBranchInst - Handles conditional and unconditional branches.
-///
-void V8ISel::visitBranchInst(BranchInst &I) {
- BasicBlock *takenSucc = I.getSuccessor (0);
- MachineBasicBlock *takenSuccMBB = MBBMap[takenSucc];
- BB->addSuccessor (takenSuccMBB);
- if (I.isConditional()) { // conditional branch
- BasicBlock *notTakenSucc = I.getSuccessor (1);
- MachineBasicBlock *notTakenSuccMBB = MBBMap[notTakenSucc];
- BB->addSuccessor (notTakenSuccMBB);
-
- // CondReg=(<condition>);
- // If (CondReg==0) goto notTakenSuccMBB;
- unsigned CondReg = getReg (I.getCondition ());
- BuildMI (BB, V8::CMPri, 2).addSImm (0).addReg (CondReg);
- BuildMI (BB, V8::BE, 1).addMBB (notTakenSuccMBB);
- }
- // goto takenSuccMBB;
- BuildMI (BB, V8::BA, 1).addMBB (takenSuccMBB);
-}
-
-/// emitGEPOperation - Common code shared between visitGetElementPtrInst and
-/// constant expression GEP support.
-///
-void V8ISel::emitGEPOperation (MachineBasicBlock *MBB,
- MachineBasicBlock::iterator IP,
- Value *Src, User::op_iterator IdxBegin,
- User::op_iterator IdxEnd, unsigned TargetReg) {
- const TargetData &TD = TM.getTargetData ();
- const Type *Ty = Src->getType ();
- unsigned basePtrReg = getReg (Src, MBB, IP);
-
- // GEPs have zero or more indices; we must perform a struct access
- // or array access for each one.
- for (GetElementPtrInst::op_iterator oi = IdxBegin, oe = IdxEnd; oi != oe;
- ++oi) {
- Value *idx = *oi;
- unsigned nextBasePtrReg = makeAnotherReg (Type::UIntTy);
- if (const StructType *StTy = dyn_cast<StructType> (Ty)) {
- // It's a struct access. idx is the index into the structure,
- // which names the field. Use the TargetData structure to
- // pick out what the layout of the structure is in memory.
- // Use the (constant) structure index's value to find the
- // right byte offset from the StructLayout class's list of
- // structure member offsets.
- unsigned fieldIndex = cast<ConstantUInt> (idx)->getValue ();
- unsigned memberOffset =
- TD.getStructLayout (StTy)->MemberOffsets[fieldIndex];
- // Emit an ADD to add memberOffset to the basePtr.
- BuildMI (*MBB, IP, V8::ADDri, 2,
- nextBasePtrReg).addReg (basePtrReg).addZImm (memberOffset);
- // The next type is the member of the structure selected by the
- // index.
- Ty = StTy->getElementType (fieldIndex);
- } else if (const SequentialType *SqTy = dyn_cast<SequentialType> (Ty)) {
- // It's an array or pointer access: [ArraySize x ElementType].
- // We want to add basePtrReg to (idxReg * sizeof ElementType). First, we
- // must find the size of the pointed-to type (Not coincidentally, the next
- // type is the type of the elements in the array).
- Ty = SqTy->getElementType ();
- unsigned elementSize = TD.getTypeSize (Ty);
- unsigned idxReg = getReg (idx, MBB, IP);
- unsigned OffsetReg = makeAnotherReg (Type::IntTy);
- unsigned elementSizeReg = makeAnotherReg (Type::UIntTy);
- copyConstantToRegister (MBB, IP,
- ConstantUInt::get(Type::UIntTy, elementSize), elementSizeReg);
- // Emit a SMUL to multiply the register holding the index by
- // elementSize, putting the result in OffsetReg.
- BuildMI (*MBB, IP, V8::SMULrr, 2,
- OffsetReg).addReg (elementSizeReg).addReg (idxReg);
- // Emit an ADD to add OffsetReg to the basePtr.
- BuildMI (*MBB, IP, V8::ADDrr, 2,
- nextBasePtrReg).addReg (basePtrReg).addReg (OffsetReg);
- }
- basePtrReg = nextBasePtrReg;
- }
- // After we have processed all the indices, the result is left in
- // basePtrReg. Move it to the register where we were expected to
- // put the answer.
- BuildMI (BB, V8::ORrr, 1, TargetReg).addReg (V8::G0).addReg (basePtrReg);
-}
-
-void V8ISel::visitGetElementPtrInst (GetElementPtrInst &I) {
- unsigned outputReg = getReg (I);
- emitGEPOperation (BB, BB->end (), I.getOperand (0),
- I.op_begin ()+1, I.op_end (), outputReg);
-}
-
-
-void V8ISel::visitBinaryOperator (Instruction &I) {
- unsigned DestReg = getReg (I);
- unsigned Op0Reg = getReg (I.getOperand (0));
- unsigned Op1Reg = getReg (I.getOperand (1));
-
- unsigned Class = getClassB (I.getType());
- unsigned OpCase = ~0;
-
- if (Class > cLong) {
- switch (I.getOpcode ()) {
- case Instruction::Add: OpCase = 0; break;
- case Instruction::Sub: OpCase = 1; break;
- case Instruction::Mul: OpCase = 2; break;
- case Instruction::Div: OpCase = 3; break;
- default: visitInstruction (I); return;
- }
- static unsigned Opcodes[] = { V8::FADDS, V8::FADDD,
- V8::FSUBS, V8::FSUBD,
- V8::FMULS, V8::FMULD,
- V8::FDIVS, V8::FDIVD };
- BuildMI (BB, Opcodes[2*OpCase + (Class - cFloat)], 2, DestReg)
- .addReg (Op0Reg).addReg (Op1Reg);
- return;
- }
-
- unsigned ResultReg = DestReg;
- if (Class != cInt)
- ResultReg = makeAnotherReg (I.getType ());
-
- // FIXME: support long, ulong, fp.
- switch (I.getOpcode ()) {
- case Instruction::Add: OpCase = 0; break;
- case Instruction::Sub: OpCase = 1; break;
- case Instruction::Mul: OpCase = 2; break;
- case Instruction::And: OpCase = 3; break;
- case Instruction::Or: OpCase = 4; break;
- case Instruction::Xor: OpCase = 5; break;
- case Instruction::Shl: OpCase = 6; break;
- case Instruction::Shr: OpCase = 7+I.getType()->isSigned(); break;
-
- case Instruction::Div:
- case Instruction::Rem: {
- unsigned Dest = ResultReg;
- if (I.getOpcode() == Instruction::Rem)
- Dest = makeAnotherReg(I.getType());
-
- // FIXME: this is probably only right for 32 bit operands.
- if (I.getType ()->isSigned()) {
- unsigned Tmp = makeAnotherReg (I.getType ());
- // Sign extend into the Y register
- BuildMI (BB, V8::SRAri, 2, Tmp).addReg (Op0Reg).addZImm (31);
- BuildMI (BB, V8::WRrr, 2, V8::Y).addReg (Tmp).addReg (V8::G0);
- BuildMI (BB, V8::SDIVrr, 2, Dest).addReg (Op0Reg).addReg (Op1Reg);
- } else {
- // Zero extend into the Y register, ie, just set it to zero
- BuildMI (BB, V8::WRrr, 2, V8::Y).addReg (V8::G0).addReg (V8::G0);
- BuildMI (BB, V8::UDIVrr, 2, Dest).addReg (Op0Reg).addReg (Op1Reg);
- }
-
- if (I.getOpcode() == Instruction::Rem) {
- unsigned Tmp = makeAnotherReg (I.getType ());
- BuildMI (BB, V8::SMULrr, 2, Tmp).addReg(Dest).addReg(Op1Reg);
- BuildMI (BB, V8::SUBrr, 2, ResultReg).addReg(Op0Reg).addReg(Tmp);
- }
- break;
- }
- default:
- visitInstruction (I);
- return;
- }
-
- static const unsigned Opcodes[] = {
- V8::ADDrr, V8::SUBrr, V8::SMULrr, V8::ANDrr, V8::ORrr, V8::XORrr,
- V8::SLLrr, V8::SRLrr, V8::SRArr
- };
- if (OpCase != ~0U) {
- BuildMI (BB, Opcodes[OpCase], 2, ResultReg).addReg (Op0Reg).addReg (Op1Reg);
- }
-
- switch (getClassB (I.getType ())) {
- case cByte:
- if (I.getType ()->isSigned ()) { // add byte
- BuildMI (BB, V8::ANDri, 2, DestReg).addReg (ResultReg).addZImm (0xff);
- } else { // add ubyte
- unsigned TmpReg = makeAnotherReg (I.getType ());
- BuildMI (BB, V8::SLLri, 2, TmpReg).addReg (ResultReg).addZImm (24);
- BuildMI (BB, V8::SRAri, 2, DestReg).addReg (TmpReg).addZImm (24);
- }
- break;
- case cShort:
- if (I.getType ()->isSigned ()) { // add short
- unsigned TmpReg = makeAnotherReg (I.getType ());
- BuildMI (BB, V8::SLLri, 2, TmpReg).addReg (ResultReg).addZImm (16);
- BuildMI (BB, V8::SRAri, 2, DestReg).addReg (TmpReg).addZImm (16);
- } else { // add ushort
- unsigned TmpReg = makeAnotherReg (I.getType ());
- BuildMI (BB, V8::SLLri, 2, TmpReg).addReg (ResultReg).addZImm (16);
- BuildMI (BB, V8::SRLri, 2, DestReg).addReg (TmpReg).addZImm (16);
- }
- break;
- case cInt:
- // Nothing to do here.
- break;
- case cLong:
- // Only support and, or, xor.
- if (OpCase < 3 || OpCase > 5) {
- visitInstruction (I);
- return;
- }
- // Do the other half of the value:
- BuildMI (BB, Opcodes[OpCase], 2, ResultReg+1).addReg (Op0Reg+1)
- .addReg (Op1Reg+1);
- break;
- default:
- visitInstruction (I);
- }
-}
-
-void V8ISel::visitSetCondInst(SetCondInst &I) {
- unsigned Op0Reg = getReg (I.getOperand (0));
- unsigned Op1Reg = getReg (I.getOperand (1));
- unsigned DestReg = getReg (I);
- const Type *Ty = I.getOperand (0)->getType ();
-
- // Compare the two values.
- assert (getClass (Ty) != cLong && "can't setcc on longs yet");
- if (getClass (Ty) < cLong) {
- BuildMI(BB, V8::SUBCCrr, 2, V8::G0).addReg(Op0Reg).addReg(Op1Reg);
- } else if (getClass (Ty) == cFloat) {
- BuildMI(BB, V8::FCMPS, 2).addReg(Op0Reg).addReg(Op1Reg);
- } else if (getClass (Ty) == cDouble) {
- BuildMI(BB, V8::FCMPD, 2).addReg(Op0Reg).addReg(Op1Reg);
- }
-
- unsigned BranchIdx;
- switch (I.getOpcode()) {
- default: assert(0 && "Unknown setcc instruction!");
- case Instruction::SetEQ: BranchIdx = 0; break;
- case Instruction::SetNE: BranchIdx = 1; break;
- case Instruction::SetLT: BranchIdx = 2; break;
- case Instruction::SetGT: BranchIdx = 3; break;
- case Instruction::SetLE: BranchIdx = 4; break;
- case Instruction::SetGE: BranchIdx = 5; break;
- }
- unsigned Column = 0;
- if (Ty->isSigned()) ++Column;
- if (Ty->isFloatingPoint()) ++Column;
- static unsigned OpcodeTab[3*6] = {
- // LLVM SparcV8
- // unsigned signed fp
- V8::BE, V8::BE, V8::FBE, // seteq = be be fbe
- V8::BNE, V8::BNE, V8::FBNE, // setne = bne bne fbne
- V8::BCS, V8::BL, V8::FBL, // setlt = bcs bl fbl
- V8::BGU, V8::BG, V8::FBG, // setgt = bgu bg fbg
- V8::BLEU, V8::BLE, V8::FBLE, // setle = bleu ble fble
- V8::BCC, V8::BGE, V8::FBGE // setge = bcc bge fbge
- };
- unsigned Opcode = OpcodeTab[3*BranchIdx + Column];
-
- MachineBasicBlock *thisMBB = BB;
- const BasicBlock *LLVM_BB = BB->getBasicBlock ();
- // thisMBB:
- // ...
- // subcc %reg0, %reg1, %g0
- // bCC copy1MBB
- // ba copy0MBB
-
- // FIXME: we wouldn't need copy0MBB (we could fold it into thisMBB)
- // if we could insert other, non-terminator instructions after the
- // bCC. But MBB->getFirstTerminator() can't understand this.
- MachineBasicBlock *copy1MBB = new MachineBasicBlock (LLVM_BB);
- F->getBasicBlockList ().push_back (copy1MBB);
- BuildMI (BB, Opcode, 1).addMBB (copy1MBB);
- MachineBasicBlock *copy0MBB = new MachineBasicBlock (LLVM_BB);
- F->getBasicBlockList ().push_back (copy0MBB);
- BuildMI (BB, V8::BA, 1).addMBB (copy0MBB);
- // Update machine-CFG edges
- BB->addSuccessor (copy1MBB);
- BB->addSuccessor (copy0MBB);
-
- // copy0MBB:
- // %FalseValue = or %G0, 0
- // ba sinkMBB
- BB = copy0MBB;
- unsigned FalseValue = makeAnotherReg (I.getType ());
- BuildMI (BB, V8::ORri, 2, FalseValue).addReg (V8::G0).addZImm (0);
- MachineBasicBlock *sinkMBB = new MachineBasicBlock (LLVM_BB);
- F->getBasicBlockList ().push_back (sinkMBB);
- BuildMI (BB, V8::BA, 1).addMBB (sinkMBB);
- // Update machine-CFG edges
- BB->addSuccessor (sinkMBB);
-
- DEBUG (std::cerr << "thisMBB is at " << (void*)thisMBB << "\n");
- DEBUG (std::cerr << "copy1MBB is at " << (void*)copy1MBB << "\n");
- DEBUG (std::cerr << "copy0MBB is at " << (void*)copy0MBB << "\n");
- DEBUG (std::cerr << "sinkMBB is at " << (void*)sinkMBB << "\n");
-
- // copy1MBB:
- // %TrueValue = or %G0, 1
- // ba sinkMBB
- BB = copy1MBB;
- unsigned TrueValue = makeAnotherReg (I.getType ());
- BuildMI (BB, V8::ORri, 2, TrueValue).addReg (V8::G0).addZImm (1);
- BuildMI (BB, V8::BA, 1).addMBB (sinkMBB);
- // Update machine-CFG edges
- BB->addSuccessor (sinkMBB);
-
- // sinkMBB:
- // %Result = phi [ %FalseValue, copy0MBB ], [ %TrueValue, copy1MBB ]
- // ...
- BB = sinkMBB;
- BuildMI (BB, V8::PHI, 4, DestReg).addReg (FalseValue)
- .addMBB (copy0MBB).addReg (TrueValue).addMBB (copy1MBB);
-}
-
-void V8ISel::visitAllocaInst(AllocaInst &I) {
- // Find the data size of the alloca inst's getAllocatedType.
- const Type *Ty = I.getAllocatedType();
- unsigned TySize = TM.getTargetData().getTypeSize(Ty);
-
- unsigned ArraySizeReg = getReg (I.getArraySize ());
- unsigned TySizeReg = getReg (ConstantUInt::get (Type::UIntTy, TySize));
- unsigned TmpReg1 = makeAnotherReg (Type::UIntTy);
- unsigned TmpReg2 = makeAnotherReg (Type::UIntTy);
- unsigned StackAdjReg = makeAnotherReg (Type::UIntTy);
-
- // StackAdjReg = (ArraySize * TySize) rounded up to nearest doubleword boundary
- BuildMI (BB, V8::UMULrr, 2, TmpReg1).addReg (ArraySizeReg).addReg (TySizeReg);
-
- // Round up TmpReg1 to nearest doubleword boundary:
- BuildMI (BB, V8::ADDri, 2, TmpReg2).addReg (TmpReg1).addSImm (7);
- BuildMI (BB, V8::ANDri, 2, StackAdjReg).addReg (TmpReg2).addSImm (-8);
-
- // Subtract size from stack pointer, thereby allocating some space.
- BuildMI (BB, V8::SUBrr, 2, V8::SP).addReg (V8::SP).addReg (StackAdjReg);
-
- // Put a pointer to the space into the result register, by copying
- // the stack pointer.
- BuildMI (BB, V8::ADDri, 2, getReg(I)).addReg (V8::SP).addSImm (96);
-
- // Inform the Frame Information that we have just allocated a variable-sized
- // object.
- F->getFrameInfo()->CreateVariableSizedObject();
-}
-
-/// LowerUnknownIntrinsicFunctionCalls - This performs a prepass over the
-/// function, lowering any calls to unknown intrinsic functions into the
-/// equivalent LLVM code.
-void V8ISel::LowerUnknownIntrinsicFunctionCalls(Function &F) {
- for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
- for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; )
- if (CallInst *CI = dyn_cast<CallInst>(I++))
- if (Function *F = CI->getCalledFunction())
- switch (F->getIntrinsicID()) {
- case Intrinsic::not_intrinsic: break;
- default:
- // All other intrinsic calls we must lower.
- Instruction *Before = CI->getPrev();
- TM.getIntrinsicLowering().LowerIntrinsicCall(CI);
- if (Before) { // Move iterator to instruction after call
- I = Before; ++I;
- } else {
- I = BB->begin();
- }
- }
-}
-
-
-void V8ISel::visitIntrinsicCall(Intrinsic::ID ID, CallInst &CI) {
- unsigned TmpReg1, TmpReg2;
- switch (ID) {
- default: assert(0 && "Intrinsic not supported!");
- }
-}
+++ /dev/null
-//===-- 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/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/GetElementPtrTypeIterator.h"
-#include "llvm/Support/InstVisitor.h"
-#include "llvm/Support/CFG.h"
-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
-
- 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);
-
- /// 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 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 visitCastInst(CastInst &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();
- }
- }
-
- if (C->getType()->isIntegral ()) {
- uint64_t Val;
- 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();
- unsigned bottomHalf = Val & 0xffffffffU;
- unsigned topHalf = Val >> 32;
- unsigned HH = topHalf >> 10;
- unsigned HM = topHalf & 0x03ff;
- unsigned LM = bottomHalf >> 10;
- unsigned LO = bottomHalf & 0x03ff;
- BuildMI (*MBB, IP, V8::SETHIi, 1, TmpReg).addZImm(HH);
- BuildMI (*MBB, IP, V8::ORri, 2, R).addReg (TmpReg)
- .addSImm (HM);
- BuildMI (*MBB, IP, V8::SETHIi, 1, TmpReg2).addZImm(LM);
- BuildMI (*MBB, IP, V8::ORri, 2, R+1).addReg (TmpReg2)
- .addSImm (LO);
- return;
- }
-
- assert(Class <= cInt && "Type not handled yet!");
-
- if (C->getType() == Type::BoolTy) {
- Val = (C == ConstantBool::True);
- } else {
- ConstantInt *CI = cast<ConstantInt> (C);
- Val = CI->getRawValue ();
- }
- switch (Class) {
- case cByte: Val = (int8_t) Val; break;
- case cShort: Val = (int16_t) Val; break;
- case cInt: Val = (int32_t) Val; break;
- default:
- std::cerr << "Offending constant: " << *C << "\n";
- assert (0 && "Can't copy this kind of constant into register yet");
- return;
- }
- if (Val == 0) {
- BuildMI (*MBB, IP, V8::ORrr, 2, R).addReg (V8::G0).addReg(V8::G0);
- } else if (((int64_t)Val >= -4096) && ((int64_t)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();
-
- assert(Ty == Type::FloatTy || Ty == Type::DoubleTy && "Unknown FP type!");
- unsigned LoadOpcode = Ty == Type::FloatTy ? V8::LDFri : V8::LDDFri;
- BuildMI (*MBB, IP, LoadOpcode, 2, R).addConstantPoolIndex (CPI).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) {
- unsigned ArgOffset;
- static const unsigned IncomingArgRegs[] = { V8::I0, V8::I1, V8::I2,
- V8::I3, V8::I4, V8::I5 };
- assert (LF->asize () < 7
- && "Can't handle loading excess call args off the stack yet");
-
- // Add IMPLICIT_DEFs of input regs.
- ArgOffset = 0;
- for (Function::aiterator I = LF->abegin(), E = LF->aend(); I != E; ++I) {
- unsigned Reg = getReg(*I);
- switch (getClassB(I->getType())) {
- case cByte:
- case cShort:
- case cInt:
- case cFloat:
- BuildMI(BB, V8::IMPLICIT_DEF, 0, IncomingArgRegs[ArgOffset]);
- break;
- default:
- // FIXME: handle cDouble, cLong
- assert (0 && "64-bit (double, long, etc.) function args not handled");
- return;
- }
- ++ArgOffset;
- }
-
- ArgOffset = 0;
- for (Function::aiterator I = LF->abegin(), E = LF->aend(); I != E; ++I) {
- unsigned Reg = getReg(*I);
- switch (getClassB(I->getType())) {
- case cByte:
- case cShort:
- case cInt:
- BuildMI(BB, V8::ORrr, 2, Reg).addReg (V8::G0)
- .addReg (IncomingArgRegs[ArgOffset]);
- break;
- case cFloat: {
- // Single-fp args are passed in integer registers; go through
- // memory to get them into FP registers. (Bleh!)
- unsigned FltAlign = TM.getTargetData().getFloatAlignment();
- int FI = F->getFrameInfo()->CreateStackObject(4, FltAlign);
- BuildMI (BB, V8::ST, 3).addFrameIndex (FI).addSImm (0)
- .addReg (IncomingArgRegs[ArgOffset]);
- BuildMI (BB, V8::LDFri, 2, Reg).addFrameIndex (FI).addSImm (0);
- break;
- }
- default:
- // FIXME: handle cDouble, cLong
- assert (0 && "64-bit (double, long, etc.) function args not handled");
- return;
- }
- ++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);
-}
-
-/// 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) {
- if (oldTyClass >= newTyClass) {
- // Emit a reg->reg copy to do a equal-size or narrowing cast,
- // and do sign/zero extension (necessary if we change signedness).
- unsigned TmpReg1 = makeAnotherReg (newTy);
- unsigned TmpReg2 = makeAnotherReg (newTy);
- BuildMI (*BB, IP, V8::ORrr, 2, TmpReg1).addReg (V8::G0).addReg (SrcReg);
- unsigned shiftWidth = 32 - (8 * TM.getTargetData ().getTypeSize (newTy));
- BuildMI (*BB, IP, V8::SLLri, 2, TmpReg2).addZImm (shiftWidth).addReg(TmpReg1);
- if (newTy->isSigned ()) { // sign-extend with SRA
- BuildMI(*BB, IP, V8::SRAri, 2, DestReg).addZImm (shiftWidth).addReg(TmpReg2);
- } else { // zero-extend with SRL
- BuildMI(*BB, IP, V8::SRLri, 2, DestReg).addZImm (shiftWidth).addReg(TmpReg2);
- }
- } else {
- unsigned TmpReg1 = makeAnotherReg (oldTy);
- unsigned TmpReg2 = makeAnotherReg (newTy);
- unsigned TmpReg3 = makeAnotherReg (newTy);
- // Widening integer cast. Make sure it's fully sign/zero-extended
- // wrt the input type, then make sure it's fully sign/zero-extended wrt
- // the output type. Kind of stupid, but simple...
- unsigned shiftWidth = 32 - (8 * TM.getTargetData ().getTypeSize (oldTy));
- BuildMI (*BB, IP, V8::SLLri, 2, TmpReg1).addZImm (shiftWidth).addReg(SrcReg);
- if (oldTy->isSigned ()) { // sign-extend with SRA
- BuildMI(*BB, IP, V8::SRAri, 2, TmpReg2).addZImm (shiftWidth).addReg(TmpReg1);
- } else { // zero-extend with SRL
- BuildMI(*BB, IP, V8::SRLri, 2, TmpReg2).addZImm (shiftWidth).addReg(TmpReg1);
- }
- shiftWidth = 32 - (8 * TM.getTargetData ().getTypeSize (newTy));
- BuildMI (*BB, IP, V8::SLLri, 2, TmpReg3).addZImm (shiftWidth).addReg(TmpReg2);
- if (newTy->isSigned ()) { // sign-extend with SRA
- BuildMI(*BB, IP, V8::SRAri, 2, DestReg).addZImm (shiftWidth).addReg(TmpReg3);
- } else { // zero-extend with SRL
- BuildMI(*BB, IP, V8::SRLri, 2, DestReg).addZImm (shiftWidth).addReg(TmpReg3);
- }
- }
- } else {
- if (newTyClass == cFloat) {
- assert (oldTyClass != cLong && "cast long to float not implemented yet");
- switch (oldTyClass) {
- 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 int 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::ST, 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;
- }
- }
- } else if (newTyClass == cDouble) {
- assert (oldTyClass != cLong && "cast long to double not implemented yet");
- switch (oldTyClass) {
- case cFloat:
- BuildMI (*BB, IP, V8::FSTOD, 1, DestReg).addReg (SrcReg);
- break;
- case cDouble: {
- // go through memory, for now
- unsigned DoubleAlignment = TM.getTargetData().getDoubleAlignment();
- int FI = F->getFrameInfo()->CreateStackObject(8, DoubleAlignment);
- BuildMI (*BB, IP, V8::STDFri, 3).addFrameIndex (FI).addSImm (0)
- .addReg (SrcReg);
- BuildMI (*BB, IP, V8::LDDFri, 2, DestReg).addFrameIndex (FI)
- .addSImm (0);
- break;
- }
- default: {
- unsigned DoubleAlignment = TM.getTargetData().getDoubleAlignment();
- unsigned TmpReg = makeAnotherReg (newTy);
- int FI = F->getFrameInfo()->CreateStackObject(8, DoubleAlignment);
- BuildMI (*BB, IP, V8::ST, 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;
- }
- }
- } else if (newTyClass == cLong) {
- if (oldTyClass == cLong) {
- // Just copy it
- 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);
- } else {
- std::cerr << "Cast still unsupported: SrcTy = "
- << *SrcTy << ", DestTy = " << *DestTy << "\n";
- abort ();
- }
- } else {
- std::cerr << "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::LDSB, 2, DestReg).addReg (PtrReg).addSImm(0);
- else
- BuildMI (BB, V8::LDUB, 2, DestReg).addReg (PtrReg).addSImm(0);
- return;
- case cShort:
- if (I.getType ()->isSigned ())
- BuildMI (BB, V8::LDSH, 2, DestReg).addReg (PtrReg).addSImm(0);
- else
- BuildMI (BB, V8::LDUH, 2, DestReg).addReg (PtrReg).addSImm(0);
- return;
- case cInt:
- BuildMI (BB, V8::LD, 2, DestReg).addReg (PtrReg).addSImm(0);
- return;
- case cLong:
- BuildMI (BB, V8::LD, 2, DestReg).addReg (PtrReg).addSImm(0);
- BuildMI (BB, V8::LD, 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::STB, 3).addReg (PtrReg).addSImm (0).addReg (SrcReg);
- return;
- case cShort:
- BuildMI (BB, V8::STH, 3).addReg (PtrReg).addSImm (0).addReg (SrcReg);
- return;
- case cInt:
- BuildMI (BB, V8::ST, 3).addReg (PtrReg).addSImm (0).addReg (SrcReg);
- return;
- case cLong:
- BuildMI (BB, V8::ST, 3).addReg (PtrReg).addSImm (0).addReg (SrcReg);
- BuildMI (BB, V8::ST, 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;
- }
- }
-
- // Deal with args
- assert (I.getNumOperands () < 8
- && "Can't handle pushing excess call args on the stack yet");
- static const unsigned OutgoingArgRegs[] = { V8::O0, V8::O1, V8::O2, V8::O3,
- V8::O4, V8::O5 };
- for (unsigned i = 1; i < 7; ++i)
- if (i < I.getNumOperands ()) {
- unsigned ArgReg = getReg (I.getOperand (i));
- if (getClassB (I.getOperand (i)->getType ()) < cLong) {
- // Schlep it over into the incoming arg register
- BuildMI (BB, V8::ORrr, 2, OutgoingArgRegs[i - 1]).addReg (V8::G0)
- .addReg (ArgReg);
- } else if (getClassB (I.getOperand (i)->getType ()) == cFloat) {
- // 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);
- BuildMI (BB, V8::LD, 2, OutgoingArgRegs[i - 1]).addFrameIndex (FI)
- .addSImm (0);
- } else {
- assert (0 && "64-bit (double, long, etc.) 'call' opnds not handled");
- }
- }
-
- // Emit call instruction
- if (Function *F = I.getCalledFunction ()) {
- BuildMI (BB, V8::CALL, 1).addGlobalAddress (F, true);
- } else { // Emit an indirect call...
- unsigned Reg = getReg (I.getCalledValue ());
- BuildMI (BB, V8::JMPLrr, 3, V8::O7).addReg (Reg).addReg (V8::G0);
- }
-
- // Deal w/ return value: schlep it over into the destination register
- if (I.getType () == Type::VoidTy)
- return;
- unsigned DestReg = getReg (I);
- switch (getClass (I.getType ())) {
- case cByte:
- case cShort:
- case cInt:
- BuildMI (BB, V8::ORrr, 2, DestReg).addReg(V8::G0).addReg(V8::O0);
- break;
- case cFloat:
- BuildMI (BB, V8::FMOVS, 2, DestReg).addReg(V8::F0);
- break;
- default:
- std::cerr << "Return type of call instruction not handled: " << I;
- abort ();
- }
-}
-
-void V8ISel::visitReturnInst(ReturnInst &I) {
- if (I.getNumOperands () == 1) {
- unsigned RetValReg = getReg (I.getOperand (0));
- switch (getClass (I.getOperand (0)->getType ())) {
- case cByte:
- case cShort:
- case cInt:
- // Schlep it over into i0 (where it will become o0 after restore).
- BuildMI (BB, V8::ORrr, 2, V8::I0).addReg(V8::G0).addReg(RetValReg);
- break;
- case cFloat:
- BuildMI (BB, V8::FMOVS, 2, V8::F0).addReg(RetValReg);
- break;
- case cDouble: {
- unsigned DoubleAlignment = TM.getTargetData().getDoubleAlignment();
- int FI = F->getFrameInfo()->CreateStackObject(8, DoubleAlignment);
- BuildMI (BB, V8::STDFri, 3).addFrameIndex (FI).addSImm (0)
- .addReg (RetValReg);
- BuildMI (BB, V8::LDDFri, 2, V8::F0).addFrameIndex (FI).addSImm (0);
- break;
- }
- case cLong:
- BuildMI (BB, V8::ORrr, 2, V8::I0).addReg(V8::G0).addReg(RetValReg);
- BuildMI (BB, V8::ORrr, 2, V8::I1).addReg(V8::G0).addReg(RetValReg+1);
- break;
- default:
- std::cerr << "Return instruction of this type not handled: " << I;
- abort ();
- }
- }
-
- // Just emit a 'retl' instruction to return.
- BuildMI(BB, V8::RETL, 0);
- return;
-}
-
-static inline BasicBlock *getBlockAfter(BasicBlock *BB) {
- Function::iterator I = BB; ++I; // Get iterator to next block
- return I != BB->getParent()->end() ? &*I : 0;
-}
-
-/// visitBranchInst - Handles conditional and unconditional branches.
-///
-void V8ISel::visitBranchInst(BranchInst &I) {
- BasicBlock *takenSucc = I.getSuccessor (0);
- MachineBasicBlock *takenSuccMBB = MBBMap[takenSucc];
- BB->addSuccessor (takenSuccMBB);
- if (I.isConditional()) { // conditional branch
- BasicBlock *notTakenSucc = I.getSuccessor (1);
- MachineBasicBlock *notTakenSuccMBB = MBBMap[notTakenSucc];
- BB->addSuccessor (notTakenSuccMBB);
-
- // CondReg=(<condition>);
- // If (CondReg==0) goto notTakenSuccMBB;
- unsigned CondReg = getReg (I.getCondition ());
- BuildMI (BB, V8::CMPri, 2).addSImm (0).addReg (CondReg);
- BuildMI (BB, V8::BE, 1).addMBB (notTakenSuccMBB);
- }
- // goto takenSuccMBB;
- BuildMI (BB, V8::BA, 1).addMBB (takenSuccMBB);
-}
-
-/// emitGEPOperation - Common code shared between visitGetElementPtrInst and
-/// constant expression GEP support.
-///
-void V8ISel::emitGEPOperation (MachineBasicBlock *MBB,
- MachineBasicBlock::iterator IP,
- Value *Src, User::op_iterator IdxBegin,
- User::op_iterator IdxEnd, unsigned TargetReg) {
- const TargetData &TD = TM.getTargetData ();
- const Type *Ty = Src->getType ();
- unsigned basePtrReg = getReg (Src, MBB, IP);
-
- // GEPs have zero or more indices; we must perform a struct access
- // or array access for each one.
- for (GetElementPtrInst::op_iterator oi = IdxBegin, oe = IdxEnd; oi != oe;
- ++oi) {
- Value *idx = *oi;
- unsigned nextBasePtrReg = makeAnotherReg (Type::UIntTy);
- if (const StructType *StTy = dyn_cast<StructType> (Ty)) {
- // It's a struct access. idx is the index into the structure,
- // which names the field. Use the TargetData structure to
- // pick out what the layout of the structure is in memory.
- // Use the (constant) structure index's value to find the
- // right byte offset from the StructLayout class's list of
- // structure member offsets.
- unsigned fieldIndex = cast<ConstantUInt> (idx)->getValue ();
- unsigned memberOffset =
- TD.getStructLayout (StTy)->MemberOffsets[fieldIndex];
- // Emit an ADD to add memberOffset to the basePtr.
- BuildMI (*MBB, IP, V8::ADDri, 2,
- nextBasePtrReg).addReg (basePtrReg).addZImm (memberOffset);
- // The next type is the member of the structure selected by the
- // index.
- Ty = StTy->getElementType (fieldIndex);
- } else if (const SequentialType *SqTy = dyn_cast<SequentialType> (Ty)) {
- // It's an array or pointer access: [ArraySize x ElementType].
- // We want to add basePtrReg to (idxReg * sizeof ElementType). First, we
- // must find the size of the pointed-to type (Not coincidentally, the next
- // type is the type of the elements in the array).
- Ty = SqTy->getElementType ();
- unsigned elementSize = TD.getTypeSize (Ty);
- unsigned idxReg = getReg (idx, MBB, IP);
- unsigned OffsetReg = makeAnotherReg (Type::IntTy);
- unsigned elementSizeReg = makeAnotherReg (Type::UIntTy);
- copyConstantToRegister (MBB, IP,
- ConstantUInt::get(Type::UIntTy, elementSize), elementSizeReg);
- // Emit a SMUL to multiply the register holding the index by
- // elementSize, putting the result in OffsetReg.
- BuildMI (*MBB, IP, V8::SMULrr, 2,
- OffsetReg).addReg (elementSizeReg).addReg (idxReg);
- // Emit an ADD to add OffsetReg to the basePtr.
- BuildMI (*MBB, IP, V8::ADDrr, 2,
- nextBasePtrReg).addReg (basePtrReg).addReg (OffsetReg);
- }
- basePtrReg = nextBasePtrReg;
- }
- // After we have processed all the indices, the result is left in
- // basePtrReg. Move it to the register where we were expected to
- // put the answer.
- BuildMI (BB, V8::ORrr, 1, TargetReg).addReg (V8::G0).addReg (basePtrReg);
-}
-
-void V8ISel::visitGetElementPtrInst (GetElementPtrInst &I) {
- unsigned outputReg = getReg (I);
- emitGEPOperation (BB, BB->end (), I.getOperand (0),
- I.op_begin ()+1, I.op_end (), outputReg);
-}
-
-
-void V8ISel::visitBinaryOperator (Instruction &I) {
- unsigned DestReg = getReg (I);
- unsigned Op0Reg = getReg (I.getOperand (0));
- unsigned Op1Reg = getReg (I.getOperand (1));
-
- unsigned Class = getClassB (I.getType());
- unsigned OpCase = ~0;
-
- if (Class > cLong) {
- switch (I.getOpcode ()) {
- case Instruction::Add: OpCase = 0; break;
- case Instruction::Sub: OpCase = 1; break;
- case Instruction::Mul: OpCase = 2; break;
- case Instruction::Div: OpCase = 3; break;
- default: visitInstruction (I); return;
- }
- static unsigned Opcodes[] = { V8::FADDS, V8::FADDD,
- V8::FSUBS, V8::FSUBD,
- V8::FMULS, V8::FMULD,
- V8::FDIVS, V8::FDIVD };
- BuildMI (BB, Opcodes[2*OpCase + (Class - cFloat)], 2, DestReg)
- .addReg (Op0Reg).addReg (Op1Reg);
- return;
- }
-
- unsigned ResultReg = DestReg;
- if (Class != cInt)
- ResultReg = makeAnotherReg (I.getType ());
-
- // FIXME: support long, ulong, fp.
- switch (I.getOpcode ()) {
- case Instruction::Add: OpCase = 0; break;
- case Instruction::Sub: OpCase = 1; break;
- case Instruction::Mul: OpCase = 2; break;
- case Instruction::And: OpCase = 3; break;
- case Instruction::Or: OpCase = 4; break;
- case Instruction::Xor: OpCase = 5; break;
- case Instruction::Shl: OpCase = 6; break;
- case Instruction::Shr: OpCase = 7+I.getType()->isSigned(); break;
-
- case Instruction::Div:
- case Instruction::Rem: {
- unsigned Dest = ResultReg;
- if (I.getOpcode() == Instruction::Rem)
- Dest = makeAnotherReg(I.getType());
-
- // FIXME: this is probably only right for 32 bit operands.
- if (I.getType ()->isSigned()) {
- unsigned Tmp = makeAnotherReg (I.getType ());
- // Sign extend into the Y register
- BuildMI (BB, V8::SRAri, 2, Tmp).addReg (Op0Reg).addZImm (31);
- BuildMI (BB, V8::WRrr, 2, V8::Y).addReg (Tmp).addReg (V8::G0);
- BuildMI (BB, V8::SDIVrr, 2, Dest).addReg (Op0Reg).addReg (Op1Reg);
- } else {
- // Zero extend into the Y register, ie, just set it to zero
- BuildMI (BB, V8::WRrr, 2, V8::Y).addReg (V8::G0).addReg (V8::G0);
- BuildMI (BB, V8::UDIVrr, 2, Dest).addReg (Op0Reg).addReg (Op1Reg);
- }
-
- if (I.getOpcode() == Instruction::Rem) {
- unsigned Tmp = makeAnotherReg (I.getType ());
- BuildMI (BB, V8::SMULrr, 2, Tmp).addReg(Dest).addReg(Op1Reg);
- BuildMI (BB, V8::SUBrr, 2, ResultReg).addReg(Op0Reg).addReg(Tmp);
- }
- break;
- }
- default:
- visitInstruction (I);
- return;
- }
-
- static const unsigned Opcodes[] = {
- V8::ADDrr, V8::SUBrr, V8::SMULrr, V8::ANDrr, V8::ORrr, V8::XORrr,
- V8::SLLrr, V8::SRLrr, V8::SRArr
- };
- if (OpCase != ~0U) {
- BuildMI (BB, Opcodes[OpCase], 2, ResultReg).addReg (Op0Reg).addReg (Op1Reg);
- }
-
- switch (getClassB (I.getType ())) {
- case cByte:
- if (I.getType ()->isSigned ()) { // add byte
- BuildMI (BB, V8::ANDri, 2, DestReg).addReg (ResultReg).addZImm (0xff);
- } else { // add ubyte
- unsigned TmpReg = makeAnotherReg (I.getType ());
- BuildMI (BB, V8::SLLri, 2, TmpReg).addReg (ResultReg).addZImm (24);
- BuildMI (BB, V8::SRAri, 2, DestReg).addReg (TmpReg).addZImm (24);
- }
- break;
- case cShort:
- if (I.getType ()->isSigned ()) { // add short
- unsigned TmpReg = makeAnotherReg (I.getType ());
- BuildMI (BB, V8::SLLri, 2, TmpReg).addReg (ResultReg).addZImm (16);
- BuildMI (BB, V8::SRAri, 2, DestReg).addReg (TmpReg).addZImm (16);
- } else { // add ushort
- unsigned TmpReg = makeAnotherReg (I.getType ());
- BuildMI (BB, V8::SLLri, 2, TmpReg).addReg (ResultReg).addZImm (16);
- BuildMI (BB, V8::SRLri, 2, DestReg).addReg (TmpReg).addZImm (16);
- }
- break;
- case cInt:
- // Nothing to do here.
- break;
- case cLong:
- // Only support and, or, xor.
- if (OpCase < 3 || OpCase > 5) {
- visitInstruction (I);
- return;
- }
- // Do the other half of the value:
- BuildMI (BB, Opcodes[OpCase], 2, ResultReg+1).addReg (Op0Reg+1)
- .addReg (Op1Reg+1);
- break;
- default:
- visitInstruction (I);
- }
-}
-
-void V8ISel::visitSetCondInst(SetCondInst &I) {
- unsigned Op0Reg = getReg (I.getOperand (0));
- unsigned Op1Reg = getReg (I.getOperand (1));
- unsigned DestReg = getReg (I);
- const Type *Ty = I.getOperand (0)->getType ();
-
- // Compare the two values.
- assert (getClass (Ty) != cLong && "can't setcc on longs yet");
- if (getClass (Ty) < cLong) {
- BuildMI(BB, V8::SUBCCrr, 2, V8::G0).addReg(Op0Reg).addReg(Op1Reg);
- } else if (getClass (Ty) == cFloat) {
- BuildMI(BB, V8::FCMPS, 2).addReg(Op0Reg).addReg(Op1Reg);
- } else if (getClass (Ty) == cDouble) {
- BuildMI(BB, V8::FCMPD, 2).addReg(Op0Reg).addReg(Op1Reg);
- }
-
- unsigned BranchIdx;
- switch (I.getOpcode()) {
- default: assert(0 && "Unknown setcc instruction!");
- case Instruction::SetEQ: BranchIdx = 0; break;
- case Instruction::SetNE: BranchIdx = 1; break;
- case Instruction::SetLT: BranchIdx = 2; break;
- case Instruction::SetGT: BranchIdx = 3; break;
- case Instruction::SetLE: BranchIdx = 4; break;
- case Instruction::SetGE: BranchIdx = 5; break;
- }
- unsigned Column = 0;
- if (Ty->isSigned()) ++Column;
- if (Ty->isFloatingPoint()) ++Column;
- static unsigned OpcodeTab[3*6] = {
- // LLVM SparcV8
- // unsigned signed fp
- V8::BE, V8::BE, V8::FBE, // seteq = be be fbe
- V8::BNE, V8::BNE, V8::FBNE, // setne = bne bne fbne
- V8::BCS, V8::BL, V8::FBL, // setlt = bcs bl fbl
- V8::BGU, V8::BG, V8::FBG, // setgt = bgu bg fbg
- V8::BLEU, V8::BLE, V8::FBLE, // setle = bleu ble fble
- V8::BCC, V8::BGE, V8::FBGE // setge = bcc bge fbge
- };
- unsigned Opcode = OpcodeTab[3*BranchIdx + Column];
-
- MachineBasicBlock *thisMBB = BB;
- const BasicBlock *LLVM_BB = BB->getBasicBlock ();
- // thisMBB:
- // ...
- // subcc %reg0, %reg1, %g0
- // bCC copy1MBB
- // ba copy0MBB
-
- // FIXME: we wouldn't need copy0MBB (we could fold it into thisMBB)
- // if we could insert other, non-terminator instructions after the
- // bCC. But MBB->getFirstTerminator() can't understand this.
- MachineBasicBlock *copy1MBB = new MachineBasicBlock (LLVM_BB);
- F->getBasicBlockList ().push_back (copy1MBB);
- BuildMI (BB, Opcode, 1).addMBB (copy1MBB);
- MachineBasicBlock *copy0MBB = new MachineBasicBlock (LLVM_BB);
- F->getBasicBlockList ().push_back (copy0MBB);
- BuildMI (BB, V8::BA, 1).addMBB (copy0MBB);
- // Update machine-CFG edges
- BB->addSuccessor (copy1MBB);
- BB->addSuccessor (copy0MBB);
-
- // copy0MBB:
- // %FalseValue = or %G0, 0
- // ba sinkMBB
- BB = copy0MBB;
- unsigned FalseValue = makeAnotherReg (I.getType ());
- BuildMI (BB, V8::ORri, 2, FalseValue).addReg (V8::G0).addZImm (0);
- MachineBasicBlock *sinkMBB = new MachineBasicBlock (LLVM_BB);
- F->getBasicBlockList ().push_back (sinkMBB);
- BuildMI (BB, V8::BA, 1).addMBB (sinkMBB);
- // Update machine-CFG edges
- BB->addSuccessor (sinkMBB);
-
- DEBUG (std::cerr << "thisMBB is at " << (void*)thisMBB << "\n");
- DEBUG (std::cerr << "copy1MBB is at " << (void*)copy1MBB << "\n");
- DEBUG (std::cerr << "copy0MBB is at " << (void*)copy0MBB << "\n");
- DEBUG (std::cerr << "sinkMBB is at " << (void*)sinkMBB << "\n");
-
- // copy1MBB:
- // %TrueValue = or %G0, 1
- // ba sinkMBB
- BB = copy1MBB;
- unsigned TrueValue = makeAnotherReg (I.getType ());
- BuildMI (BB, V8::ORri, 2, TrueValue).addReg (V8::G0).addZImm (1);
- BuildMI (BB, V8::BA, 1).addMBB (sinkMBB);
- // Update machine-CFG edges
- BB->addSuccessor (sinkMBB);
-
- // sinkMBB:
- // %Result = phi [ %FalseValue, copy0MBB ], [ %TrueValue, copy1MBB ]
- // ...
- BB = sinkMBB;
- BuildMI (BB, V8::PHI, 4, DestReg).addReg (FalseValue)
- .addMBB (copy0MBB).addReg (TrueValue).addMBB (copy1MBB);
-}
-
-void V8ISel::visitAllocaInst(AllocaInst &I) {
- // Find the data size of the alloca inst's getAllocatedType.
- const Type *Ty = I.getAllocatedType();
- unsigned TySize = TM.getTargetData().getTypeSize(Ty);
-
- unsigned ArraySizeReg = getReg (I.getArraySize ());
- unsigned TySizeReg = getReg (ConstantUInt::get (Type::UIntTy, TySize));
- unsigned TmpReg1 = makeAnotherReg (Type::UIntTy);
- unsigned TmpReg2 = makeAnotherReg (Type::UIntTy);
- unsigned StackAdjReg = makeAnotherReg (Type::UIntTy);
-
- // StackAdjReg = (ArraySize * TySize) rounded up to nearest doubleword boundary
- BuildMI (BB, V8::UMULrr, 2, TmpReg1).addReg (ArraySizeReg).addReg (TySizeReg);
-
- // Round up TmpReg1 to nearest doubleword boundary:
- BuildMI (BB, V8::ADDri, 2, TmpReg2).addReg (TmpReg1).addSImm (7);
- BuildMI (BB, V8::ANDri, 2, StackAdjReg).addReg (TmpReg2).addSImm (-8);
-
- // Subtract size from stack pointer, thereby allocating some space.
- BuildMI (BB, V8::SUBrr, 2, V8::SP).addReg (V8::SP).addReg (StackAdjReg);
-
- // Put a pointer to the space into the result register, by copying
- // the stack pointer.
- BuildMI (BB, V8::ADDri, 2, getReg(I)).addReg (V8::SP).addSImm (96);
-
- // Inform the Frame Information that we have just allocated a variable-sized
- // object.
- F->getFrameInfo()->CreateVariableSizedObject();
-}
-
-/// LowerUnknownIntrinsicFunctionCalls - This performs a prepass over the
-/// function, lowering any calls to unknown intrinsic functions into the
-/// equivalent LLVM code.
-void V8ISel::LowerUnknownIntrinsicFunctionCalls(Function &F) {
- for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
- for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; )
- if (CallInst *CI = dyn_cast<CallInst>(I++))
- if (Function *F = CI->getCalledFunction())
- switch (F->getIntrinsicID()) {
- case Intrinsic::not_intrinsic: break;
- default:
- // All other intrinsic calls we must lower.
- Instruction *Before = CI->getPrev();
- TM.getIntrinsicLowering().LowerIntrinsicCall(CI);
- if (Before) { // Move iterator to instruction after call
- I = Before; ++I;
- } else {
- I = BB->begin();
- }
- }
-}
-
-
-void V8ISel::visitIntrinsicCall(Intrinsic::ID ID, CallInst &CI) {
- unsigned TmpReg1, TmpReg2;
- switch (ID) {
- default: assert(0 && "Intrinsic not supported!");
- }
-}
projects / oota-llvm.git / commitdiff