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https://github.com/c64scene-ar/llvm-6502.git
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Give the X86 JIT the ability to encode global+disp constants. Patch
contributed by Jeff Cohen! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17010 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -193,7 +193,7 @@ namespace {
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void emitPCRelativeBlockAddress(const MachineBasicBlock *BB);
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void emitMaybePCRelativeValue(unsigned Address, bool isPCRelative);
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void emitGlobalAddressForCall(GlobalValue *GV);
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void emitGlobalAddressForPtr(GlobalValue *GV);
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void emitGlobalAddressForPtr(GlobalValue *GV, int Disp = 0);
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void emitRegModRMByte(unsigned ModRMReg, unsigned RegOpcodeField);
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void emitSIBByte(unsigned SS, unsigned Index, unsigned Base);
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@ -294,7 +294,7 @@ void Emitter::emitGlobalAddressForCall(GlobalValue *GV) {
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/// this is part of a "take the address of a global" instruction, which is not
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/// PC relative.
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///
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void Emitter::emitGlobalAddressForPtr(GlobalValue *GV) {
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void Emitter::emitGlobalAddressForPtr(GlobalValue *GV, int Disp /* = 0 */) {
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// Get the address from the backend...
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unsigned Address = MCE.getGlobalValueAddress(GV);
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@ -306,7 +306,7 @@ void Emitter::emitGlobalAddressForPtr(GlobalValue *GV) {
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Address = getResolver(MCE).getLazyResolver((Function*)GV);
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}
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emitMaybePCRelativeValue(Address, false);
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emitMaybePCRelativeValue(Address + Disp, false);
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}
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@ -374,14 +374,25 @@ static bool isDisp8(int Value) {
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void Emitter::emitMemModRMByte(const MachineInstr &MI,
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unsigned Op, unsigned RegOpcodeField) {
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const MachineOperand &Disp = MI.getOperand(Op+3);
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const MachineOperand &Op3 = MI.getOperand(Op+3);
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GlobalValue *GV = 0;
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int DispVal = 0;
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if (Op3.isGlobalAddress()) {
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GV = Op3.getGlobal();
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DispVal = Op3.getOffset();
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} else {
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DispVal = Op3.getImmedValue();
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}
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if (MI.getOperand(Op).isConstantPoolIndex()) {
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// Emit a direct address reference [disp32] where the displacement of the
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// constant pool entry is controlled by the MCE.
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assert(!GV && "Constant Pool reference cannot be relative to global!");
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MCE.emitByte(ModRMByte(0, RegOpcodeField, 5));
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unsigned Index = MI.getOperand(Op).getConstantPoolIndex();
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unsigned Address = MCE.getConstantPoolEntryAddress(Index);
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MCE.emitWord(Address+Disp.getImmedValue());
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MCE.emitWord(Address+DispVal);
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return;
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}
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@ -394,20 +405,27 @@ void Emitter::emitMemModRMByte(const MachineInstr &MI,
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if (BaseReg.getReg() == 0) { // Just a displacement?
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// Emit special case [disp32] encoding
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MCE.emitByte(ModRMByte(0, RegOpcodeField, 5));
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emitConstant(Disp.getImmedValue(), 4);
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if (GV)
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emitGlobalAddressForPtr(GV, DispVal);
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else
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emitConstant(DispVal, 4);
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} else {
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unsigned BaseRegNo = getX86RegNum(BaseReg.getReg());
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if (Disp.getImmedValue() == 0 && BaseRegNo != N86::EBP) {
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if (GV) {
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// Emit the most general non-SIB encoding: [REG+disp32]
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MCE.emitByte(ModRMByte(2, RegOpcodeField, BaseRegNo));
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emitGlobalAddressForPtr(GV, DispVal);
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} else if (DispVal == 0 && BaseRegNo != N86::EBP) {
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// Emit simple indirect register encoding... [EAX] f.e.
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MCE.emitByte(ModRMByte(0, RegOpcodeField, BaseRegNo));
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} else if (isDisp8(Disp.getImmedValue())) {
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} else if (isDisp8(DispVal)) {
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// Emit the disp8 encoding... [REG+disp8]
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MCE.emitByte(ModRMByte(1, RegOpcodeField, BaseRegNo));
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emitConstant(Disp.getImmedValue(), 1);
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emitConstant(DispVal, 1);
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} else {
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// Emit the most general non-SIB encoding: [REG+disp32]
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MCE.emitByte(ModRMByte(2, RegOpcodeField, BaseRegNo));
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emitConstant(Disp.getImmedValue(), 4);
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emitConstant(DispVal, 4);
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}
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}
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@ -421,10 +439,14 @@ void Emitter::emitMemModRMByte(const MachineInstr &MI,
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// MOD=0, BASE=5, to JUST get the index, scale, and displacement.
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MCE.emitByte(ModRMByte(0, RegOpcodeField, 4));
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ForceDisp32 = true;
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} else if (Disp.getImmedValue() == 0 && BaseReg.getReg() != X86::EBP) {
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} else if (GV) {
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// Emit the normal disp32 encoding...
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MCE.emitByte(ModRMByte(2, RegOpcodeField, 4));
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ForceDisp32 = true;
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} else if (DispVal == 0 && BaseReg.getReg() != X86::EBP) {
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// Emit no displacement ModR/M byte
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MCE.emitByte(ModRMByte(0, RegOpcodeField, 4));
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} else if (isDisp8(Disp.getImmedValue())) {
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} else if (isDisp8(DispVal)) {
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// Emit the disp8 encoding...
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MCE.emitByte(ModRMByte(1, RegOpcodeField, 4));
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ForceDisp8 = true; // Make sure to force 8 bit disp if Base=EBP
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@ -446,18 +468,20 @@ void Emitter::emitMemModRMByte(const MachineInstr &MI,
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unsigned BaseRegNo = getX86RegNum(BaseReg.getReg());
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unsigned IndexRegNo;
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if (IndexReg.getReg())
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IndexRegNo = getX86RegNum(IndexReg.getReg());
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IndexRegNo = getX86RegNum(IndexReg.getReg());
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else
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IndexRegNo = 4; // For example [ESP+1*<noreg>+4]
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IndexRegNo = 4; // For example [ESP+1*<noreg>+4]
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emitSIBByte(SS, IndexRegNo, BaseRegNo);
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}
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// Do we need to output a displacement?
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if (Disp.getImmedValue() != 0 || ForceDisp32 || ForceDisp8) {
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if (!ForceDisp32 && isDisp8(Disp.getImmedValue()))
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emitConstant(Disp.getImmedValue(), 1);
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if (DispVal != 0 || ForceDisp32 || ForceDisp8) {
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if (!ForceDisp32 && isDisp8(DispVal))
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emitConstant(DispVal, 1);
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else if (GV)
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emitGlobalAddressForPtr(GV, DispVal);
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else
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emitConstant(Disp.getImmedValue(), 4);
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emitConstant(DispVal, 4);
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}
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}
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}
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@ -492,8 +516,8 @@ void Emitter::emitInstruction(const MachineInstr &MI) {
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case X86II::D8: case X86II::D9: case X86II::DA: case X86II::DB:
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case X86II::DC: case X86II::DD: case X86II::DE: case X86II::DF:
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MCE.emitByte(0xD8+
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(((Desc.TSFlags & X86II::Op0Mask)-X86II::D8)
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>> X86II::Op0Shift));
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(((Desc.TSFlags & X86II::Op0Mask)-X86II::D8)
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>> X86II::Op0Shift));
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break; // Two-byte opcode prefix
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default: assert(0 && "Invalid prefix!");
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case 0: break; // No prefix!
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@ -525,7 +549,7 @@ void Emitter::emitInstruction(const MachineInstr &MI) {
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} else if (MO.isImmediate()) {
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emitConstant(MO.getImmedValue(), sizeOfImm(Desc));
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} else {
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assert(0 && "Unknown RawFrm operand!");
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assert(0 && "Unknown RawFrm operand!");
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}
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}
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break;
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@ -535,15 +559,17 @@ void Emitter::emitInstruction(const MachineInstr &MI) {
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if (MI.getNumOperands() == 2) {
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const MachineOperand &MO1 = MI.getOperand(1);
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if (Value *V = MO1.getVRegValueOrNull()) {
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assert(sizeOfImm(Desc) == 4 && "Don't know how to emit non-pointer values!");
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assert(sizeOfImm(Desc) == 4 &&
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"Don't know how to emit non-pointer values!");
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emitGlobalAddressForPtr(cast<GlobalValue>(V));
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} else if (MO1.isGlobalAddress()) {
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assert(sizeOfImm(Desc) == 4 && "Don't know how to emit non-pointer values!");
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assert(sizeOfImm(Desc) == 4 &&
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"Don't know how to emit non-pointer values!");
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assert(!MO1.isPCRelative() && "Function pointer ref is PC relative?");
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emitGlobalAddressForPtr(MO1.getGlobal());
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emitGlobalAddressForPtr(MO1.getGlobal(), MO1.getOffset());
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} else if (MO1.isExternalSymbol()) {
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assert(sizeOfImm(Desc) == 4 && "Don't know how to emit non-pointer values!");
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assert(sizeOfImm(Desc) == 4 &&
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"Don't know how to emit non-pointer values!");
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unsigned Address = MCE.getGlobalValueAddress(MO1.getSymbolName());
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assert(Address && "Unknown external symbol!");
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emitMaybePCRelativeValue(Address, MO1.isPCRelative());
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@ -608,7 +634,8 @@ void Emitter::emitInstruction(const MachineInstr &MI) {
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if (MI.getOperand(4).isImmediate())
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emitConstant(MI.getOperand(4).getImmedValue(), sizeOfImm(Desc));
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else if (MI.getOperand(4).isGlobalAddress())
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emitGlobalAddressForPtr(MI.getOperand(4).getGlobal());
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emitGlobalAddressForPtr(MI.getOperand(4).getGlobal(),
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MI.getOperand(4).getOffset());
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else
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assert(0 && "Unknown operand!");
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}
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