return (STI.getFeatureBits() & X86::Mode16Bit) != 0;
}
+ /// Is16BitMemOperand - Return true if the specified instruction has
+ /// a 16-bit memory operand. Op specifies the operand # of the memoperand.
+ bool Is16BitMemOperand(const MCInst &MI, unsigned Op) const {
+ const MCOperand &BaseReg = MI.getOperand(Op+X86::AddrBaseReg);
+ const MCOperand &IndexReg = MI.getOperand(Op+X86::AddrIndexReg);
+ const MCOperand &Disp = MI.getOperand(Op+X86::AddrDisp);
+
+ if (is16BitMode() && BaseReg.getReg() == 0 &&
+ Disp.isImm() && Disp.getImm() < 0x10000)
+ return true;
+ if ((BaseReg.getReg() != 0 &&
+ X86MCRegisterClasses[X86::GR16RegClassID].contains(BaseReg.getReg())) ||
+ (IndexReg.getReg() != 0 &&
+ X86MCRegisterClasses[X86::GR16RegClassID].contains(IndexReg.getReg())))
+ return true;
+ return false;
+ }
+
unsigned GetX86RegNum(const MCOperand &MO) const {
return Ctx.getRegisterInfo()->getEncodingValue(MO.getReg()) & 0x7;
}
const MCInst &MI, const MCInstrDesc &Desc,
raw_ostream &OS) const;
- void EmitSegmentOverridePrefix(uint64_t TSFlags, unsigned &CurByte,
- int MemOperand, const MCInst &MI,
- raw_ostream &OS) const;
+ void EmitSegmentOverridePrefix(unsigned &CurByte, unsigned SegOperand,
+ const MCInst &MI, raw_ostream &OS) const;
void EmitOpcodePrefix(uint64_t TSFlags, unsigned &CurByte, int MemOperand,
const MCInst &MI, const MCInstrDesc &Desc,
}
#endif
-/// Is16BitMemOperand - Return true if the specified instruction has
-/// a 16-bit memory operand. Op specifies the operand # of the memoperand.
-static bool Is16BitMemOperand(const MCInst &MI, unsigned Op) {
- const MCOperand &BaseReg = MI.getOperand(Op+X86::AddrBaseReg);
- const MCOperand &IndexReg = MI.getOperand(Op+X86::AddrIndexReg);
-
- if ((BaseReg.getReg() != 0 &&
- X86MCRegisterClasses[X86::GR16RegClassID].contains(BaseReg.getReg())) ||
- (IndexReg.getReg() != 0 &&
- X86MCRegisterClasses[X86::GR16RegClassID].contains(IndexReg.getReg())))
- return true;
- return false;
-}
-
/// StartsWithGlobalOffsetTable - Check if this expression starts with
/// _GLOBAL_OFFSET_TABLE_ and if it is of the form
/// _GLOBAL_OFFSET_TABLE_-symbol. This is needed to support PIC on ELF
bool HasVEX_4V = (TSFlags >> X86II::VEXShift) & X86II::VEX_4V;
bool HasVEX_4VOp3 = (TSFlags >> X86II::VEXShift) & X86II::VEX_4VOp3;
bool HasMemOp4 = (TSFlags >> X86II::VEXShift) & X86II::MemOp4;
- bool HasEVEX_RC = false;
+ bool HasEVEX_RC = (TSFlags >> X86II::VEXShift) & X86II::EVEX_RC;
// VEX_R: opcode externsion equivalent to REX.R in
// 1's complement (inverted) form
unsigned char VEX_W = 0;
// XOP: Use XOP prefix byte 0x8f instead of VEX.
- bool XOP = false;
+ bool XOP = (TSFlags >> X86II::VEXShift) & X86II::XOP;
// VEX_5M (VEX m-mmmmm field):
//
// EVEX_aaa
unsigned char EVEX_aaa = 0;
- // Encode the operand size opcode prefix as needed.
- if (TSFlags & X86II::OpSize)
- VEX_PP = 0x01;
+ bool EncodeRC = false;
if ((TSFlags >> X86II::VEXShift) & X86II::VEX_W)
VEX_W = 1;
- if ((TSFlags >> X86II::VEXShift) & X86II::XOP)
- XOP = true;
-
if ((TSFlags >> X86II::VEXShift) & X86II::VEX_L)
VEX_L = 1;
if (HasEVEX && ((TSFlags >> X86II::VEXShift) & X86II::EVEX_L2))
case X86II::TA: // 0F 3A
VEX_5M = 0x3;
break;
+ case X86II::T8PD: // 66 0F 38
+ VEX_PP = 0x1;
+ VEX_5M = 0x2;
+ break;
case X86II::T8XS: // F3 0F 38
VEX_PP = 0x2;
VEX_5M = 0x2;
VEX_PP = 0x3;
VEX_5M = 0x2;
break;
+ case X86II::TAPD: // 66 0F 3A
+ VEX_PP = 0x1;
+ VEX_5M = 0x3;
+ break;
case X86II::TAXD: // F2 0F 3A
VEX_PP = 0x3;
VEX_5M = 0x3;
break;
+ case X86II::PD: // 66 0F
+ VEX_PP = 0x1;
+ break;
case X86II::XS: // F3 0F
VEX_PP = 0x2;
break;
// Classify VEX_B, VEX_4V, VEX_R, VEX_X
unsigned NumOps = Desc.getNumOperands();
- unsigned RcOperand = NumOps-1;
- unsigned CurOp = 0;
- if (NumOps > 1 && Desc.getOperandConstraint(1, MCOI::TIED_TO) == 0)
- ++CurOp;
- else if (NumOps > 3 && Desc.getOperandConstraint(2, MCOI::TIED_TO) == 0 &&
- Desc.getOperandConstraint(3, MCOI::TIED_TO) == 1)
- // Special case for AVX-512 GATHER with 2 TIED_TO operands
- // Skip the first 2 operands: dst, mask_wb
- CurOp += 2;
- else if (NumOps > 3 && Desc.getOperandConstraint(2, MCOI::TIED_TO) == 0 &&
- Desc.getOperandConstraint(NumOps - 1, MCOI::TIED_TO) == 1)
- // Special case for GATHER with 2 TIED_TO operands
- // Skip the first 2 operands: dst, mask_wb
- CurOp += 2;
- else if (NumOps > 2 && Desc.getOperandConstraint(NumOps - 2, MCOI::TIED_TO) == 0)
- // SCATTER
- ++CurOp;
+ unsigned CurOp = X86II::getOperandBias(Desc);
switch (TSFlags & X86II::FormMask) {
+ default: llvm_unreachable("Unexpected form in EmitVEXOpcodePrefix!");
+ case X86II::RawFrm:
+ break;
case X86II::MRMDestMem: {
// MRMDestMem instructions forms:
// MemAddr, src1(ModR/M)
if (HasVEX_4VOp3)
VEX_4V = getVEXRegisterEncoding(MI, CurOp++);
if (EVEX_b) {
- assert(RcOperand >= CurOp);
- EVEX_rc = MI.getOperand(RcOperand).getImm() & 0x3;
- HasEVEX_RC = true;
- }
+ if (HasEVEX_RC) {
+ unsigned RcOperand = NumOps-1;
+ assert(RcOperand >= CurOp);
+ EVEX_rc = MI.getOperand(RcOperand).getImm() & 0x3;
+ }
+ EncodeRC = true;
+ }
break;
case X86II::MRMDestReg:
// MRMDestReg instructions forms:
VEX_R = 0x0;
if (HasEVEX && X86II::is32ExtendedReg(MI.getOperand(CurOp).getReg()))
EVEX_R2 = 0x0;
+ if (EVEX_b)
+ EncodeRC = true;
break;
case X86II::MRM0r: case X86II::MRM1r:
case X86II::MRM2r: case X86II::MRM3r:
if (HasEVEX && X86II::is32ExtendedReg(MI.getOperand(CurOp).getReg()))
VEX_X = 0x0;
break;
- default: // RawFrm
- break;
}
// Emit segment override opcode prefix as needed.
- EmitSegmentOverridePrefix(TSFlags, CurByte, MemOperand, MI, OS);
+ if (MemOperand >= 0)
+ EmitSegmentOverridePrefix(CurByte, MemOperand+X86::AddrSegmentReg, MI, OS);
if (!HasEVEX) {
// VEX opcode prefix can have 2 or 3 bytes
(VEX_4V << 3) |
(EVEX_U << 2) |
VEX_PP, CurByte, OS);
- if (HasEVEX_RC)
+ if (EncodeRC)
EmitByte((EVEX_z << 7) |
(EVEX_rc << 5) |
(EVEX_b << 4) |
}
/// EmitSegmentOverridePrefix - Emit segment override opcode prefix as needed
-void X86MCCodeEmitter::EmitSegmentOverridePrefix(uint64_t TSFlags,
- unsigned &CurByte, int MemOperand,
- const MCInst &MI,
- raw_ostream &OS) const {
- if (MemOperand < 0)
- return; // No memory operand
-
+void X86MCCodeEmitter::EmitSegmentOverridePrefix(unsigned &CurByte,
+ unsigned SegOperand,
+ const MCInst &MI,
+ raw_ostream &OS) const {
// Check for explicit segment override on memory operand.
- switch (MI.getOperand(MemOperand+X86::AddrSegmentReg).getReg()) {
+ switch (MI.getOperand(SegOperand).getReg()) {
default: llvm_unreachable("Unknown segment register!");
case 0: break;
case X86::CS: EmitByte(0x2E, CurByte, OS); break;
EmitByte(0xF0, CurByte, OS);
// Emit segment override opcode prefix as needed.
- EmitSegmentOverridePrefix(TSFlags, CurByte, MemOperand, MI, OS);
+ if (MemOperand >= 0)
+ EmitSegmentOverridePrefix(CurByte, MemOperand+X86::AddrSegmentReg, MI, OS);
// Emit the repeat opcode prefix as needed.
if ((TSFlags & X86II::Op0Mask) == X86II::REP)
// Emit the address size opcode prefix as needed.
bool need_address_override;
- if (TSFlags & X86II::AdSize) {
+ // The AdSize prefix is only for 32-bit and 64-bit modes. Hm, perhaps we
+ // should introduce an AdSize16 bit instead of having seven special cases?
+ if ((!is16BitMode() && TSFlags & X86II::AdSize) ||
+ (is16BitMode() && (MI.getOpcode() == X86::JECXZ_32 ||
+ MI.getOpcode() == X86::MOV8o8a ||
+ MI.getOpcode() == X86::MOV16o16a ||
+ MI.getOpcode() == X86::MOV32o32a ||
+ MI.getOpcode() == X86::MOV8ao8 ||
+ MI.getOpcode() == X86::MOV16ao16 ||
+ MI.getOpcode() == X86::MOV32ao32))) {
need_address_override = true;
} else if (MemOperand == -1) {
need_address_override = false;
case X86II::A7: // 0F A7
Need0FPrefix = true;
break;
+ case X86II::PD: // 66 0F
+ case X86II::T8PD: // 66 0F 38
+ case X86II::TAPD: // 66 0F 3A
+ EmitByte(0x66, CurByte, OS);
+ Need0FPrefix = true;
+ break;
case X86II::XS: // F3 0F
case X86II::T8XS: // F3 0F 38
EmitByte(0xF3, CurByte, OS);
// FIXME: Pull this up into previous switch if REX can be moved earlier.
switch (TSFlags & X86II::Op0Mask) {
+ case X86II::T8PD: // 66 0F 38
case X86II::T8XS: // F3 0F 38
case X86II::T8XD: // F2 0F 38
case X86II::T8: // 0F 38
EmitByte(0x38, CurByte, OS);
break;
+ case X86II::TAPD: // 66 0F 3A
case X86II::TAXD: // F2 0F 3A
case X86II::TA: // 0F 3A
EmitByte(0x3A, CurByte, OS);
// It uses the EVEX.aaa field?
bool HasEVEX = (TSFlags >> X86II::VEXShift) & X86II::EVEX;
bool HasEVEX_K = HasEVEX && ((TSFlags >> X86II::VEXShift) & X86II::EVEX_K);
- bool HasEVEX_B = HasEVEX && ((TSFlags >> X86II::VEXShift) & X86II::EVEX_B);
+ bool HasEVEX_RC = HasEVEX && ((TSFlags >> X86II::VEXShift) & X86II::EVEX_RC);
// Determine where the memory operand starts, if present.
int MemoryOperand = X86II::getMemoryOperandNo(TSFlags, Opcode);
llvm_unreachable("Unknown FormMask value in X86MCCodeEmitter!");
case X86II::Pseudo:
llvm_unreachable("Pseudo instruction shouldn't be emitted");
+ case X86II::RawFrmDstSrc: {
+ unsigned siReg = MI.getOperand(1).getReg();
+ assert(((siReg == X86::SI && MI.getOperand(0).getReg() == X86::DI) ||
+ (siReg == X86::ESI && MI.getOperand(0).getReg() == X86::EDI) ||
+ (siReg == X86::RSI && MI.getOperand(0).getReg() == X86::RDI)) &&
+ "SI and DI register sizes do not match");
+ // Emit segment override opcode prefix as needed (not for %ds).
+ if (MI.getOperand(2).getReg() != X86::DS)
+ EmitSegmentOverridePrefix(CurByte, 2, MI, OS);
+ // Emit OpSize prefix as needed.
+ if ((!is32BitMode() && siReg == X86::ESI) ||
+ (is32BitMode() && siReg == X86::SI))
+ EmitByte(0x67, CurByte, OS);
+ CurOp += 3; // Consume operands.
+ EmitByte(BaseOpcode, CurByte, OS);
+ break;
+ }
+ case X86II::RawFrmSrc: {
+ unsigned siReg = MI.getOperand(0).getReg();
+ // Emit segment override opcode prefix as needed (not for %ds).
+ if (MI.getOperand(1).getReg() != X86::DS)
+ EmitSegmentOverridePrefix(CurByte, 1, MI, OS);
+ // Emit OpSize prefix as needed.
+ if ((!is32BitMode() && siReg == X86::ESI) ||
+ (is32BitMode() && siReg == X86::SI))
+ EmitByte(0x67, CurByte, OS);
+ CurOp += 2; // Consume operands.
+ EmitByte(BaseOpcode, CurByte, OS);
+ break;
+ }
+ case X86II::RawFrmDst: {
+ unsigned siReg = MI.getOperand(0).getReg();
+ // Emit OpSize prefix as needed.
+ if ((!is32BitMode() && siReg == X86::EDI) ||
+ (is32BitMode() && siReg == X86::DI))
+ EmitByte(0x67, CurByte, OS);
+ ++CurOp; // Consume operand.
+ EmitByte(BaseOpcode, CurByte, OS);
+ break;
+ }
case X86II::RawFrm:
EmitByte(BaseOpcode, CurByte, OS);
break;
+ case X86II::RawFrmMemOffs:
+ // Emit segment override opcode prefix as needed.
+ EmitSegmentOverridePrefix(CurByte, 1, MI, OS);
+ EmitByte(BaseOpcode, CurByte, OS);
+ EmitImmediate(MI.getOperand(CurOp++), MI.getLoc(),
+ X86II::getSizeOfImm(TSFlags), getImmFixupKind(TSFlags),
+ CurByte, OS, Fixups);
+ ++CurOp; // skip segment operand
+ break;
case X86II::RawFrmImm8:
EmitByte(BaseOpcode, CurByte, OS);
EmitImmediate(MI.getOperand(CurOp++), MI.getLoc(),
if (HasVEX_4VOp3)
++CurOp;
// do not count the rounding control operand
- if (HasEVEX_B)
+ if (HasEVEX_RC)
NumOps--;
break;
projects / oota-llvm.git / blobdiff