mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-07-19 03:29:22 +00:00
Finally enable the setcc-branch folding code.
Also, fix a bug where ubyte 255 would sometimes be output as -1. This was afflicting hbd. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18823 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Brian Gaeke
parent
81cf150b5d
commit
f731be0dd5
@ -270,17 +270,21 @@ void V8ISel::copyConstantToRegister(MachineBasicBlock *MBB,
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if (C->getType() == Type::BoolTy) {
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Val = (C == ConstantBool::True);
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} else {
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ConstantInt *CI = cast<ConstantInt> (C);
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ConstantIntegral *CI = cast<ConstantIntegral> (C);
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Val = CI->getRawValue ();
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}
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switch (Class) {
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case cByte: Val = (int8_t) Val; break;
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case cShort: Val = (int16_t) Val; break;
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case cInt: Val = (int32_t) Val; break;
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default:
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std::cerr << "Offending constant: " << *C << "\n";
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assert (0 && "Can't copy this kind of constant into register yet");
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return;
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if (C->getType()->isSigned()) {
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switch (Class) {
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case cByte: Val = (int8_t) Val; break;
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case cShort: Val = (int16_t) Val; break;
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case cInt: Val = (int32_t) Val; break;
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}
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} else {
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switch (Class) {
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case cByte: Val = (uint8_t) Val; break;
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case cShort: Val = (uint16_t) Val; break;
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case cInt: Val = (uint32_t) Val; break;
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}
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}
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if (Val == 0) {
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BuildMI (*MBB, IP, V8::ORrr, 2, R).addReg (V8::G0).addReg(V8::G0);
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@ -1015,7 +1019,7 @@ static inline BasicBlock *getBlockAfter(BasicBlock *BB) {
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/// This is the case if the conditional branch is the only user of the setcc.
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///
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static SetCondInst *canFoldSetCCIntoBranch(Value *V) {
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return 0; // disable.
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//return 0; // disable.
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if (SetCondInst *SCI = dyn_cast<SetCondInst>(V))
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if (SCI->hasOneUse()) {
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BranchInst *User = dyn_cast<BranchInst>(SCI->use_back());
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@ -1039,14 +1043,66 @@ void V8ISel::visitBranchInst(BranchInst &I) {
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MachineBasicBlock *notTakenSuccMBB = MBBMap[notTakenSucc];
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BB->addSuccessor (notTakenSuccMBB);
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// CondReg=(<condition>);
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// If (CondReg==0) goto notTakenSuccMBB;
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unsigned CondReg = getReg (I.getCondition ());
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BuildMI (BB, V8::CMPri, 2).addSImm (0).addReg (CondReg);
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BuildMI (BB, V8::BE, 1).addMBB (notTakenSuccMBB);
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// See if we can fold a previous setcc instr into this branch.
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SetCondInst *SCI = canFoldSetCCIntoBranch(I.getCondition());
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if (SCI == 0) {
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// The condition did not come from a setcc which we could fold.
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// CondReg=(<condition>);
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// If (CondReg==0) goto notTakenSuccMBB;
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unsigned CondReg = getReg (I.getCondition ());
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BuildMI (BB, V8::CMPri, 2).addSImm (0).addReg (CondReg);
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BuildMI (BB, V8::BE, 1).addMBB (notTakenSuccMBB);
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BuildMI (BB, V8::BA, 1).addMBB (takenSuccMBB);
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return;
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}
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// Fold the setCC instr into the branch.
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unsigned Op0Reg = getReg (SCI->getOperand (0));
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unsigned Op1Reg = getReg (SCI->getOperand (1));
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const Type *Ty = SCI->getOperand (0)->getType ();
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// Compare the two values.
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if (getClass (Ty) < cLong) {
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BuildMI(BB, V8::SUBCCrr, 2, V8::G0).addReg(Op0Reg).addReg(Op1Reg);
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} else if (getClass (Ty) == cLong) {
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assert (0 && "Can't fold setcc long/ulong into branch");
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} else if (getClass (Ty) == cFloat) {
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BuildMI(BB, V8::FCMPS, 2).addReg(Op0Reg).addReg(Op1Reg);
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} else if (getClass (Ty) == cDouble) {
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BuildMI(BB, V8::FCMPD, 2).addReg(Op0Reg).addReg(Op1Reg);
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}
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unsigned BranchIdx;
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switch (SCI->getOpcode()) {
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default: assert(0 && "Unknown setcc instruction!");
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case Instruction::SetEQ: BranchIdx = 0; break;
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case Instruction::SetNE: BranchIdx = 1; break;
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case Instruction::SetLT: BranchIdx = 2; break;
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case Instruction::SetGT: BranchIdx = 3; break;
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case Instruction::SetLE: BranchIdx = 4; break;
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case Instruction::SetGE: BranchIdx = 5; break;
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}
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unsigned Column = 0;
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if (Ty->isSigned() && !Ty->isFloatingPoint()) Column = 1;
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if (Ty->isFloatingPoint()) Column = 2;
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static unsigned OpcodeTab[3*6] = {
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// LLVM SparcV8
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// unsigned signed fp
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V8::BE, V8::BE, V8::FBE, // seteq = be be fbe
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V8::BNE, V8::BNE, V8::FBNE, // setne = bne bne fbne
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V8::BCS, V8::BL, V8::FBL, // setlt = bcs bl fbl
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V8::BGU, V8::BG, V8::FBG, // setgt = bgu bg fbg
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V8::BLEU, V8::BLE, V8::FBLE, // setle = bleu ble fble
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V8::BCC, V8::BGE, V8::FBGE // setge = bcc bge fbge
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};
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unsigned Opcode = OpcodeTab[3*BranchIdx + Column];
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BuildMI (BB, Opcode, 1).addMBB (takenSuccMBB);
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BuildMI (BB, V8::BA, 1).addMBB (notTakenSuccMBB);
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} else {
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// goto takenSuccMBB;
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BuildMI (BB, V8::BA, 1).addMBB (takenSuccMBB);
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}
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// goto takenSuccMBB;
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BuildMI (BB, V8::BA, 1).addMBB (takenSuccMBB);
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}
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/// emitGEPOperation - Common code shared between visitGetElementPtrInst and
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@ -270,17 +270,21 @@ void V8ISel::copyConstantToRegister(MachineBasicBlock *MBB,
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if (C->getType() == Type::BoolTy) {
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Val = (C == ConstantBool::True);
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} else {
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ConstantInt *CI = cast<ConstantInt> (C);
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ConstantIntegral *CI = cast<ConstantIntegral> (C);
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Val = CI->getRawValue ();
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}
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switch (Class) {
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case cByte: Val = (int8_t) Val; break;
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case cShort: Val = (int16_t) Val; break;
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case cInt: Val = (int32_t) Val; break;
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default:
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std::cerr << "Offending constant: " << *C << "\n";
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assert (0 && "Can't copy this kind of constant into register yet");
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return;
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if (C->getType()->isSigned()) {
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switch (Class) {
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case cByte: Val = (int8_t) Val; break;
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case cShort: Val = (int16_t) Val; break;
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case cInt: Val = (int32_t) Val; break;
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}
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} else {
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switch (Class) {
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case cByte: Val = (uint8_t) Val; break;
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case cShort: Val = (uint16_t) Val; break;
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case cInt: Val = (uint32_t) Val; break;
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}
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}
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if (Val == 0) {
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BuildMI (*MBB, IP, V8::ORrr, 2, R).addReg (V8::G0).addReg(V8::G0);
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@ -1015,7 +1019,7 @@ static inline BasicBlock *getBlockAfter(BasicBlock *BB) {
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/// This is the case if the conditional branch is the only user of the setcc.
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///
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static SetCondInst *canFoldSetCCIntoBranch(Value *V) {
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return 0; // disable.
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//return 0; // disable.
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if (SetCondInst *SCI = dyn_cast<SetCondInst>(V))
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if (SCI->hasOneUse()) {
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BranchInst *User = dyn_cast<BranchInst>(SCI->use_back());
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@ -1039,14 +1043,66 @@ void V8ISel::visitBranchInst(BranchInst &I) {
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MachineBasicBlock *notTakenSuccMBB = MBBMap[notTakenSucc];
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BB->addSuccessor (notTakenSuccMBB);
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// CondReg=(<condition>);
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// If (CondReg==0) goto notTakenSuccMBB;
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unsigned CondReg = getReg (I.getCondition ());
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BuildMI (BB, V8::CMPri, 2).addSImm (0).addReg (CondReg);
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BuildMI (BB, V8::BE, 1).addMBB (notTakenSuccMBB);
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// See if we can fold a previous setcc instr into this branch.
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SetCondInst *SCI = canFoldSetCCIntoBranch(I.getCondition());
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if (SCI == 0) {
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// The condition did not come from a setcc which we could fold.
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// CondReg=(<condition>);
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// If (CondReg==0) goto notTakenSuccMBB;
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unsigned CondReg = getReg (I.getCondition ());
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BuildMI (BB, V8::CMPri, 2).addSImm (0).addReg (CondReg);
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BuildMI (BB, V8::BE, 1).addMBB (notTakenSuccMBB);
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BuildMI (BB, V8::BA, 1).addMBB (takenSuccMBB);
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return;
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}
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// Fold the setCC instr into the branch.
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unsigned Op0Reg = getReg (SCI->getOperand (0));
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unsigned Op1Reg = getReg (SCI->getOperand (1));
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const Type *Ty = SCI->getOperand (0)->getType ();
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// Compare the two values.
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if (getClass (Ty) < cLong) {
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BuildMI(BB, V8::SUBCCrr, 2, V8::G0).addReg(Op0Reg).addReg(Op1Reg);
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} else if (getClass (Ty) == cLong) {
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assert (0 && "Can't fold setcc long/ulong into branch");
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} else if (getClass (Ty) == cFloat) {
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BuildMI(BB, V8::FCMPS, 2).addReg(Op0Reg).addReg(Op1Reg);
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} else if (getClass (Ty) == cDouble) {
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BuildMI(BB, V8::FCMPD, 2).addReg(Op0Reg).addReg(Op1Reg);
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}
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unsigned BranchIdx;
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switch (SCI->getOpcode()) {
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default: assert(0 && "Unknown setcc instruction!");
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case Instruction::SetEQ: BranchIdx = 0; break;
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case Instruction::SetNE: BranchIdx = 1; break;
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case Instruction::SetLT: BranchIdx = 2; break;
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case Instruction::SetGT: BranchIdx = 3; break;
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case Instruction::SetLE: BranchIdx = 4; break;
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case Instruction::SetGE: BranchIdx = 5; break;
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}
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unsigned Column = 0;
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if (Ty->isSigned() && !Ty->isFloatingPoint()) Column = 1;
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if (Ty->isFloatingPoint()) Column = 2;
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static unsigned OpcodeTab[3*6] = {
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// LLVM SparcV8
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// unsigned signed fp
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V8::BE, V8::BE, V8::FBE, // seteq = be be fbe
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V8::BNE, V8::BNE, V8::FBNE, // setne = bne bne fbne
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V8::BCS, V8::BL, V8::FBL, // setlt = bcs bl fbl
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V8::BGU, V8::BG, V8::FBG, // setgt = bgu bg fbg
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V8::BLEU, V8::BLE, V8::FBLE, // setle = bleu ble fble
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V8::BCC, V8::BGE, V8::FBGE // setge = bcc bge fbge
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};
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unsigned Opcode = OpcodeTab[3*BranchIdx + Column];
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BuildMI (BB, Opcode, 1).addMBB (takenSuccMBB);
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BuildMI (BB, V8::BA, 1).addMBB (notTakenSuccMBB);
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} else {
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// goto takenSuccMBB;
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BuildMI (BB, V8::BA, 1).addMBB (takenSuccMBB);
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}
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// goto takenSuccMBB;
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BuildMI (BB, V8::BA, 1).addMBB (takenSuccMBB);
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}
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/// emitGEPOperation - Common code shared between visitGetElementPtrInst and
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