1 //===-- X86MCCodeEmitter.cpp - Convert X86 code to machine code -----------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the X86MCCodeEmitter class.
12 //===----------------------------------------------------------------------===//
14 #define DEBUG_TYPE "mccodeemitter"
15 #include "MCTargetDesc/X86MCTargetDesc.h"
16 #include "MCTargetDesc/X86BaseInfo.h"
17 #include "MCTargetDesc/X86FixupKinds.h"
18 #include "llvm/MC/MCCodeEmitter.h"
19 #include "llvm/MC/MCExpr.h"
20 #include "llvm/MC/MCInst.h"
21 #include "llvm/MC/MCInstrInfo.h"
22 #include "llvm/MC/MCRegisterInfo.h"
23 #include "llvm/MC/MCSubtargetInfo.h"
24 #include "llvm/MC/MCSymbol.h"
25 #include "llvm/Support/raw_ostream.h"
30 class X86MCCodeEmitter : public MCCodeEmitter {
31 X86MCCodeEmitter(const X86MCCodeEmitter &); // DO NOT IMPLEMENT
32 void operator=(const X86MCCodeEmitter &); // DO NOT IMPLEMENT
33 const MCInstrInfo &MCII;
34 const MCSubtargetInfo &STI;
37 X86MCCodeEmitter(const MCInstrInfo &mcii, const MCSubtargetInfo &sti,
39 : MCII(mcii), STI(sti), Ctx(ctx) {
42 ~X86MCCodeEmitter() {}
44 bool is64BitMode() const {
45 // FIXME: Can tablegen auto-generate this?
46 return (STI.getFeatureBits() & X86::Mode64Bit) != 0;
49 bool is32BitMode() const {
50 // FIXME: Can tablegen auto-generate this?
51 return (STI.getFeatureBits() & X86::Mode64Bit) == 0;
54 static unsigned GetX86RegNum(const MCOperand &MO) {
55 return X86_MC::getX86RegNum(MO.getReg());
58 // On regular x86, both XMM0-XMM7 and XMM8-XMM15 are encoded in the range
59 // 0-7 and the difference between the 2 groups is given by the REX prefix.
60 // In the VEX prefix, registers are seen sequencially from 0-15 and encoded
61 // in 1's complement form, example:
63 // ModRM field => XMM9 => 1
64 // VEX.VVVV => XMM9 => ~9
66 // See table 4-35 of Intel AVX Programming Reference for details.
67 static unsigned char getVEXRegisterEncoding(const MCInst &MI,
69 unsigned SrcReg = MI.getOperand(OpNum).getReg();
70 unsigned SrcRegNum = GetX86RegNum(MI.getOperand(OpNum));
71 if (X86II::isX86_64ExtendedReg(SrcReg))
74 // The registers represented through VEX_VVVV should
75 // be encoded in 1's complement form.
76 return (~SrcRegNum) & 0xf;
79 void EmitByte(unsigned char C, unsigned &CurByte, raw_ostream &OS) const {
84 void EmitConstant(uint64_t Val, unsigned Size, unsigned &CurByte,
85 raw_ostream &OS) const {
86 // Output the constant in little endian byte order.
87 for (unsigned i = 0; i != Size; ++i) {
88 EmitByte(Val & 255, CurByte, OS);
93 void EmitImmediate(const MCOperand &Disp, SMLoc Loc,
94 unsigned ImmSize, MCFixupKind FixupKind,
95 unsigned &CurByte, raw_ostream &OS,
96 SmallVectorImpl<MCFixup> &Fixups,
97 int ImmOffset = 0) const;
99 inline static unsigned char ModRMByte(unsigned Mod, unsigned RegOpcode,
101 assert(Mod < 4 && RegOpcode < 8 && RM < 8 && "ModRM Fields out of range!");
102 return RM | (RegOpcode << 3) | (Mod << 6);
105 void EmitRegModRMByte(const MCOperand &ModRMReg, unsigned RegOpcodeFld,
106 unsigned &CurByte, raw_ostream &OS) const {
107 EmitByte(ModRMByte(3, RegOpcodeFld, GetX86RegNum(ModRMReg)), CurByte, OS);
110 void EmitSIBByte(unsigned SS, unsigned Index, unsigned Base,
111 unsigned &CurByte, raw_ostream &OS) const {
112 // SIB byte is in the same format as the ModRMByte.
113 EmitByte(ModRMByte(SS, Index, Base), CurByte, OS);
117 void EmitMemModRMByte(const MCInst &MI, unsigned Op,
118 unsigned RegOpcodeField,
119 uint64_t TSFlags, unsigned &CurByte, raw_ostream &OS,
120 SmallVectorImpl<MCFixup> &Fixups) const;
122 void EncodeInstruction(const MCInst &MI, raw_ostream &OS,
123 SmallVectorImpl<MCFixup> &Fixups) const;
125 void EmitVEXOpcodePrefix(uint64_t TSFlags, unsigned &CurByte, int MemOperand,
126 const MCInst &MI, const MCInstrDesc &Desc,
127 raw_ostream &OS) const;
129 void EmitSegmentOverridePrefix(uint64_t TSFlags, unsigned &CurByte,
130 int MemOperand, const MCInst &MI,
131 raw_ostream &OS) const;
133 void EmitOpcodePrefix(uint64_t TSFlags, unsigned &CurByte, int MemOperand,
134 const MCInst &MI, const MCInstrDesc &Desc,
135 raw_ostream &OS) const;
138 } // end anonymous namespace
141 MCCodeEmitter *llvm::createX86MCCodeEmitter(const MCInstrInfo &MCII,
142 const MCRegisterInfo &MRI,
143 const MCSubtargetInfo &STI,
145 return new X86MCCodeEmitter(MCII, STI, Ctx);
148 /// isDisp8 - Return true if this signed displacement fits in a 8-bit
149 /// sign-extended field.
150 static bool isDisp8(int Value) {
151 return Value == (signed char)Value;
154 /// getImmFixupKind - Return the appropriate fixup kind to use for an immediate
155 /// in an instruction with the specified TSFlags.
156 static MCFixupKind getImmFixupKind(uint64_t TSFlags) {
157 unsigned Size = X86II::getSizeOfImm(TSFlags);
158 bool isPCRel = X86II::isImmPCRel(TSFlags);
160 return MCFixup::getKindForSize(Size, isPCRel);
163 /// Is32BitMemOperand - Return true if the specified instruction has
164 /// a 32-bit memory operand. Op specifies the operand # of the memoperand.
165 static bool Is32BitMemOperand(const MCInst &MI, unsigned Op) {
166 const MCOperand &BaseReg = MI.getOperand(Op+X86::AddrBaseReg);
167 const MCOperand &IndexReg = MI.getOperand(Op+X86::AddrIndexReg);
169 if ((BaseReg.getReg() != 0 &&
170 X86MCRegisterClasses[X86::GR32RegClassID].contains(BaseReg.getReg())) ||
171 (IndexReg.getReg() != 0 &&
172 X86MCRegisterClasses[X86::GR32RegClassID].contains(IndexReg.getReg())))
177 /// Is64BitMemOperand - Return true if the specified instruction has
178 /// a 64-bit memory operand. Op specifies the operand # of the memoperand.
180 static bool Is64BitMemOperand(const MCInst &MI, unsigned Op) {
181 const MCOperand &BaseReg = MI.getOperand(Op+X86::AddrBaseReg);
182 const MCOperand &IndexReg = MI.getOperand(Op+X86::AddrIndexReg);
184 if ((BaseReg.getReg() != 0 &&
185 X86MCRegisterClasses[X86::GR64RegClassID].contains(BaseReg.getReg())) ||
186 (IndexReg.getReg() != 0 &&
187 X86MCRegisterClasses[X86::GR64RegClassID].contains(IndexReg.getReg())))
193 /// Is16BitMemOperand - Return true if the specified instruction has
194 /// a 16-bit memory operand. Op specifies the operand # of the memoperand.
195 static bool Is16BitMemOperand(const MCInst &MI, unsigned Op) {
196 const MCOperand &BaseReg = MI.getOperand(Op+X86::AddrBaseReg);
197 const MCOperand &IndexReg = MI.getOperand(Op+X86::AddrIndexReg);
199 if ((BaseReg.getReg() != 0 &&
200 X86MCRegisterClasses[X86::GR16RegClassID].contains(BaseReg.getReg())) ||
201 (IndexReg.getReg() != 0 &&
202 X86MCRegisterClasses[X86::GR16RegClassID].contains(IndexReg.getReg())))
207 /// StartsWithGlobalOffsetTable - Check if this expression starts with
208 /// _GLOBAL_OFFSET_TABLE_ and if it is of the form
209 /// _GLOBAL_OFFSET_TABLE_-symbol. This is needed to support PIC on ELF
210 /// i386 as _GLOBAL_OFFSET_TABLE_ is magical. We check only simple case that
211 /// are know to be used: _GLOBAL_OFFSET_TABLE_ by itself or at the start
212 /// of a binary expression.
213 enum GlobalOffsetTableExprKind {
218 static GlobalOffsetTableExprKind
219 StartsWithGlobalOffsetTable(const MCExpr *Expr) {
220 const MCExpr *RHS = 0;
221 if (Expr->getKind() == MCExpr::Binary) {
222 const MCBinaryExpr *BE = static_cast<const MCBinaryExpr *>(Expr);
227 if (Expr->getKind() != MCExpr::SymbolRef)
230 const MCSymbolRefExpr *Ref = static_cast<const MCSymbolRefExpr*>(Expr);
231 const MCSymbol &S = Ref->getSymbol();
232 if (S.getName() != "_GLOBAL_OFFSET_TABLE_")
234 if (RHS && RHS->getKind() == MCExpr::SymbolRef)
239 void X86MCCodeEmitter::
240 EmitImmediate(const MCOperand &DispOp, SMLoc Loc, unsigned Size,
241 MCFixupKind FixupKind, unsigned &CurByte, raw_ostream &OS,
242 SmallVectorImpl<MCFixup> &Fixups, int ImmOffset) const {
243 const MCExpr *Expr = NULL;
244 if (DispOp.isImm()) {
245 // If this is a simple integer displacement that doesn't require a
246 // relocation, emit it now.
247 if (FixupKind != FK_PCRel_1 &&
248 FixupKind != FK_PCRel_2 &&
249 FixupKind != FK_PCRel_4) {
250 EmitConstant(DispOp.getImm()+ImmOffset, Size, CurByte, OS);
253 Expr = MCConstantExpr::Create(DispOp.getImm(), Ctx);
255 Expr = DispOp.getExpr();
258 // If we have an immoffset, add it to the expression.
259 if ((FixupKind == FK_Data_4 ||
260 FixupKind == FK_Data_8 ||
261 FixupKind == MCFixupKind(X86::reloc_signed_4byte))) {
262 GlobalOffsetTableExprKind Kind = StartsWithGlobalOffsetTable(Expr);
263 if (Kind != GOT_None) {
264 assert(ImmOffset == 0);
266 FixupKind = MCFixupKind(X86::reloc_global_offset_table);
267 if (Kind == GOT_Normal)
269 } else if (Expr->getKind() == MCExpr::SymbolRef) {
270 const MCSymbolRefExpr *Ref = static_cast<const MCSymbolRefExpr*>(Expr);
271 if (Ref->getKind() == MCSymbolRefExpr::VK_SECREL) {
272 FixupKind = MCFixupKind(FK_SecRel_4);
277 // If the fixup is pc-relative, we need to bias the value to be relative to
278 // the start of the field, not the end of the field.
279 if (FixupKind == FK_PCRel_4 ||
280 FixupKind == MCFixupKind(X86::reloc_riprel_4byte) ||
281 FixupKind == MCFixupKind(X86::reloc_riprel_4byte_movq_load))
283 if (FixupKind == FK_PCRel_2)
285 if (FixupKind == FK_PCRel_1)
289 Expr = MCBinaryExpr::CreateAdd(Expr, MCConstantExpr::Create(ImmOffset, Ctx),
292 // Emit a symbolic constant as a fixup and 4 zeros.
293 Fixups.push_back(MCFixup::Create(CurByte, Expr, FixupKind, Loc));
294 EmitConstant(0, Size, CurByte, OS);
297 void X86MCCodeEmitter::EmitMemModRMByte(const MCInst &MI, unsigned Op,
298 unsigned RegOpcodeField,
299 uint64_t TSFlags, unsigned &CurByte,
301 SmallVectorImpl<MCFixup> &Fixups) const{
302 const MCOperand &Disp = MI.getOperand(Op+X86::AddrDisp);
303 const MCOperand &Base = MI.getOperand(Op+X86::AddrBaseReg);
304 const MCOperand &Scale = MI.getOperand(Op+X86::AddrScaleAmt);
305 const MCOperand &IndexReg = MI.getOperand(Op+X86::AddrIndexReg);
306 unsigned BaseReg = Base.getReg();
308 // Handle %rip relative addressing.
309 if (BaseReg == X86::RIP) { // [disp32+RIP] in X86-64 mode
310 assert(is64BitMode() && "Rip-relative addressing requires 64-bit mode");
311 assert(IndexReg.getReg() == 0 && "Invalid rip-relative address");
312 EmitByte(ModRMByte(0, RegOpcodeField, 5), CurByte, OS);
314 unsigned FixupKind = X86::reloc_riprel_4byte;
316 // movq loads are handled with a special relocation form which allows the
317 // linker to eliminate some loads for GOT references which end up in the
318 // same linkage unit.
319 if (MI.getOpcode() == X86::MOV64rm)
320 FixupKind = X86::reloc_riprel_4byte_movq_load;
322 // rip-relative addressing is actually relative to the *next* instruction.
323 // Since an immediate can follow the mod/rm byte for an instruction, this
324 // means that we need to bias the immediate field of the instruction with
325 // the size of the immediate field. If we have this case, add it into the
326 // expression to emit.
327 int ImmSize = X86II::hasImm(TSFlags) ? X86II::getSizeOfImm(TSFlags) : 0;
329 EmitImmediate(Disp, MI.getLoc(), 4, MCFixupKind(FixupKind),
330 CurByte, OS, Fixups, -ImmSize);
334 unsigned BaseRegNo = BaseReg ? GetX86RegNum(Base) : -1U;
336 // Determine whether a SIB byte is needed.
337 // If no BaseReg, issue a RIP relative instruction only if the MCE can
338 // resolve addresses on-the-fly, otherwise use SIB (Intel Manual 2A, table
339 // 2-7) and absolute references.
341 if (// The SIB byte must be used if there is an index register.
342 IndexReg.getReg() == 0 &&
343 // The SIB byte must be used if the base is ESP/RSP/R12, all of which
344 // encode to an R/M value of 4, which indicates that a SIB byte is
346 BaseRegNo != N86::ESP &&
347 // If there is no base register and we're in 64-bit mode, we need a SIB
348 // byte to emit an addr that is just 'disp32' (the non-RIP relative form).
349 (!is64BitMode() || BaseReg != 0)) {
351 if (BaseReg == 0) { // [disp32] in X86-32 mode
352 EmitByte(ModRMByte(0, RegOpcodeField, 5), CurByte, OS);
353 EmitImmediate(Disp, MI.getLoc(), 4, FK_Data_4, CurByte, OS, Fixups);
357 // If the base is not EBP/ESP and there is no displacement, use simple
358 // indirect register encoding, this handles addresses like [EAX]. The
359 // encoding for [EBP] with no displacement means [disp32] so we handle it
360 // by emitting a displacement of 0 below.
361 if (Disp.isImm() && Disp.getImm() == 0 && BaseRegNo != N86::EBP) {
362 EmitByte(ModRMByte(0, RegOpcodeField, BaseRegNo), CurByte, OS);
366 // Otherwise, if the displacement fits in a byte, encode as [REG+disp8].
367 if (Disp.isImm() && isDisp8(Disp.getImm())) {
368 EmitByte(ModRMByte(1, RegOpcodeField, BaseRegNo), CurByte, OS);
369 EmitImmediate(Disp, MI.getLoc(), 1, FK_Data_1, CurByte, OS, Fixups);
373 // Otherwise, emit the most general non-SIB encoding: [REG+disp32]
374 EmitByte(ModRMByte(2, RegOpcodeField, BaseRegNo), CurByte, OS);
375 EmitImmediate(Disp, MI.getLoc(), 4, MCFixupKind(X86::reloc_signed_4byte), CurByte, OS,
380 // We need a SIB byte, so start by outputting the ModR/M byte first
381 assert(IndexReg.getReg() != X86::ESP &&
382 IndexReg.getReg() != X86::RSP && "Cannot use ESP as index reg!");
384 bool ForceDisp32 = false;
385 bool ForceDisp8 = false;
387 // If there is no base register, we emit the special case SIB byte with
388 // MOD=0, BASE=5, to JUST get the index, scale, and displacement.
389 EmitByte(ModRMByte(0, RegOpcodeField, 4), CurByte, OS);
391 } else if (!Disp.isImm()) {
392 // Emit the normal disp32 encoding.
393 EmitByte(ModRMByte(2, RegOpcodeField, 4), CurByte, OS);
395 } else if (Disp.getImm() == 0 &&
396 // Base reg can't be anything that ends up with '5' as the base
397 // reg, it is the magic [*] nomenclature that indicates no base.
398 BaseRegNo != N86::EBP) {
399 // Emit no displacement ModR/M byte
400 EmitByte(ModRMByte(0, RegOpcodeField, 4), CurByte, OS);
401 } else if (isDisp8(Disp.getImm())) {
402 // Emit the disp8 encoding.
403 EmitByte(ModRMByte(1, RegOpcodeField, 4), CurByte, OS);
404 ForceDisp8 = true; // Make sure to force 8 bit disp if Base=EBP
406 // Emit the normal disp32 encoding.
407 EmitByte(ModRMByte(2, RegOpcodeField, 4), CurByte, OS);
410 // Calculate what the SS field value should be...
411 static const unsigned SSTable[] = { ~0U, 0, 1, ~0U, 2, ~0U, ~0U, ~0U, 3 };
412 unsigned SS = SSTable[Scale.getImm()];
415 // Handle the SIB byte for the case where there is no base, see Intel
416 // Manual 2A, table 2-7. The displacement has already been output.
418 if (IndexReg.getReg())
419 IndexRegNo = GetX86RegNum(IndexReg);
420 else // Examples: [ESP+1*<noreg>+4] or [scaled idx]+disp32 (MOD=0,BASE=5)
422 EmitSIBByte(SS, IndexRegNo, 5, CurByte, OS);
425 if (IndexReg.getReg())
426 IndexRegNo = GetX86RegNum(IndexReg);
428 IndexRegNo = 4; // For example [ESP+1*<noreg>+4]
429 EmitSIBByte(SS, IndexRegNo, GetX86RegNum(Base), CurByte, OS);
432 // Do we need to output a displacement?
434 EmitImmediate(Disp, MI.getLoc(), 1, FK_Data_1, CurByte, OS, Fixups);
435 else if (ForceDisp32 || Disp.getImm() != 0)
436 EmitImmediate(Disp, MI.getLoc(), 4, MCFixupKind(X86::reloc_signed_4byte),
437 CurByte, OS, Fixups);
440 /// EmitVEXOpcodePrefix - AVX instructions are encoded using a opcode prefix
442 void X86MCCodeEmitter::EmitVEXOpcodePrefix(uint64_t TSFlags, unsigned &CurByte,
443 int MemOperand, const MCInst &MI,
444 const MCInstrDesc &Desc,
445 raw_ostream &OS) const {
446 bool HasVEX_4V = (TSFlags >> X86II::VEXShift) & X86II::VEX_4V;
447 bool HasVEX_4VOp3 = (TSFlags >> X86II::VEXShift) & X86II::VEX_4VOp3;
449 // VEX_R: opcode externsion equivalent to REX.R in
450 // 1's complement (inverted) form
452 // 1: Same as REX_R=0 (must be 1 in 32-bit mode)
453 // 0: Same as REX_R=1 (64 bit mode only)
455 unsigned char VEX_R = 0x1;
457 // VEX_X: equivalent to REX.X, only used when a
458 // register is used for index in SIB Byte.
460 // 1: Same as REX.X=0 (must be 1 in 32-bit mode)
461 // 0: Same as REX.X=1 (64-bit mode only)
462 unsigned char VEX_X = 0x1;
466 // 1: Same as REX_B=0 (ignored in 32-bit mode)
467 // 0: Same as REX_B=1 (64 bit mode only)
469 unsigned char VEX_B = 0x1;
471 // VEX_W: opcode specific (use like REX.W, or used for
472 // opcode extension, or ignored, depending on the opcode byte)
473 unsigned char VEX_W = 0;
475 // XOP: Use XOP prefix byte 0x8f instead of VEX.
476 unsigned char XOP = 0;
478 // VEX_5M (VEX m-mmmmm field):
480 // 0b00000: Reserved for future use
481 // 0b00001: implied 0F leading opcode
482 // 0b00010: implied 0F 38 leading opcode bytes
483 // 0b00011: implied 0F 3A leading opcode bytes
484 // 0b00100-0b11111: Reserved for future use
485 // 0b01000: XOP map select - 08h instructions with imm byte
486 // 0b10001: XOP map select - 09h instructions with no imm byte
487 unsigned char VEX_5M = 0x1;
489 // VEX_4V (VEX vvvv field): a register specifier
490 // (in 1's complement form) or 1111 if unused.
491 unsigned char VEX_4V = 0xf;
493 // VEX_L (Vector Length):
495 // 0: scalar or 128-bit vector
498 unsigned char VEX_L = 0;
500 // VEX_PP: opcode extension providing equivalent
501 // functionality of a SIMD prefix
508 unsigned char VEX_PP = 0;
510 // Encode the operand size opcode prefix as needed.
511 if (TSFlags & X86II::OpSize)
514 if ((TSFlags >> X86II::VEXShift) & X86II::VEX_W)
517 if ((TSFlags >> X86II::VEXShift) & X86II::XOP)
520 if ((TSFlags >> X86II::VEXShift) & X86II::VEX_L)
523 switch (TSFlags & X86II::Op0Mask) {
524 default: llvm_unreachable("Invalid prefix!");
525 case X86II::T8: // 0F 38
528 case X86II::TA: // 0F 3A
531 case X86II::T8XS: // F3 0F 38
535 case X86II::T8XD: // F2 0F 38
539 case X86II::TAXD: // F2 0F 3A
543 case X86II::XS: // F3 0F
546 case X86II::XD: // F2 0F
555 case X86II::A6: // Bypass: Not used by VEX
556 case X86II::A7: // Bypass: Not used by VEX
557 case X86II::TB: // Bypass: Not used by VEX
563 // Set the vector length to 256-bit if YMM0-YMM15 is used
564 for (unsigned i = 0; i != MI.getNumOperands(); ++i) {
565 if (!MI.getOperand(i).isReg())
567 unsigned SrcReg = MI.getOperand(i).getReg();
568 if (SrcReg >= X86::YMM0 && SrcReg <= X86::YMM15)
572 // Classify VEX_B, VEX_4V, VEX_R, VEX_X
573 unsigned NumOps = Desc.getNumOperands();
575 if (NumOps > 1 && Desc.getOperandConstraint(1, MCOI::TIED_TO) != -1)
578 switch (TSFlags & X86II::FormMask) {
579 case X86II::MRMInitReg: llvm_unreachable("FIXME: Remove this!");
580 case X86II::MRMDestMem: {
581 // MRMDestMem instructions forms:
582 // MemAddr, src1(ModR/M)
583 // MemAddr, src1(VEX_4V), src2(ModR/M)
584 // MemAddr, src1(ModR/M), imm8
586 if (X86II::isX86_64ExtendedReg(MI.getOperand(X86::AddrBaseReg).getReg()))
588 if (X86II::isX86_64ExtendedReg(MI.getOperand(X86::AddrIndexReg).getReg()))
591 CurOp = X86::AddrNumOperands;
593 VEX_4V = getVEXRegisterEncoding(MI, CurOp++);
595 const MCOperand &MO = MI.getOperand(CurOp);
596 if (MO.isReg() && X86II::isX86_64ExtendedReg(MO.getReg()))
600 case X86II::MRMSrcMem:
601 // MRMSrcMem instructions forms:
602 // src1(ModR/M), MemAddr
603 // src1(ModR/M), src2(VEX_4V), MemAddr
604 // src1(ModR/M), MemAddr, imm8
605 // src1(ModR/M), MemAddr, src2(VEX_I8IMM)
608 // dst(ModR/M.reg), src1(VEX_4V), src2(ModR/M), src3(VEX_I8IMM)
609 // dst(ModR/M.reg), src1(VEX_4V), src2(VEX_I8IMM), src3(ModR/M),
610 if (X86II::isX86_64ExtendedReg(MI.getOperand(CurOp++).getReg()))
614 VEX_4V = getVEXRegisterEncoding(MI, CurOp);
616 if (X86II::isX86_64ExtendedReg(
617 MI.getOperand(MemOperand+X86::AddrBaseReg).getReg()))
619 if (X86II::isX86_64ExtendedReg(
620 MI.getOperand(MemOperand+X86::AddrIndexReg).getReg()))
624 // Instruction format for 4VOp3:
625 // src1(ModR/M), MemAddr, src3(VEX_4V)
626 // CurOp points to start of the MemoryOperand,
627 // it skips TIED_TO operands if exist, then increments past src1.
628 // CurOp + X86::AddrNumOperands will point to src3.
629 VEX_4V = getVEXRegisterEncoding(MI, CurOp+X86::AddrNumOperands);
631 case X86II::MRM0m: case X86II::MRM1m:
632 case X86II::MRM2m: case X86II::MRM3m:
633 case X86II::MRM4m: case X86II::MRM5m:
634 case X86II::MRM6m: case X86II::MRM7m: {
635 // MRM[0-9]m instructions forms:
637 // src1(VEX_4V), MemAddr
639 VEX_4V = getVEXRegisterEncoding(MI, 0);
641 if (X86II::isX86_64ExtendedReg(
642 MI.getOperand(MemOperand+X86::AddrBaseReg).getReg()))
644 if (X86II::isX86_64ExtendedReg(
645 MI.getOperand(MemOperand+X86::AddrIndexReg).getReg()))
649 case X86II::MRMSrcReg:
650 // MRMSrcReg instructions forms:
651 // dst(ModR/M), src1(VEX_4V), src2(ModR/M), src3(VEX_I8IMM)
652 // dst(ModR/M), src1(ModR/M)
653 // dst(ModR/M), src1(ModR/M), imm8
655 if (X86II::isX86_64ExtendedReg(MI.getOperand(CurOp).getReg()))
660 VEX_4V = getVEXRegisterEncoding(MI, CurOp++);
661 if (X86II::isX86_64ExtendedReg(MI.getOperand(CurOp).getReg()))
665 VEX_4V = getVEXRegisterEncoding(MI, CurOp);
667 case X86II::MRMDestReg:
668 // MRMDestReg instructions forms:
669 // dst(ModR/M), src(ModR/M)
670 // dst(ModR/M), src(ModR/M), imm8
671 if (X86II::isX86_64ExtendedReg(MI.getOperand(0).getReg()))
673 if (X86II::isX86_64ExtendedReg(MI.getOperand(1).getReg()))
676 case X86II::MRM0r: case X86II::MRM1r:
677 case X86II::MRM2r: case X86II::MRM3r:
678 case X86II::MRM4r: case X86II::MRM5r:
679 case X86II::MRM6r: case X86II::MRM7r:
680 // MRM0r-MRM7r instructions forms:
681 // dst(VEX_4V), src(ModR/M), imm8
682 VEX_4V = getVEXRegisterEncoding(MI, 0);
683 if (X86II::isX86_64ExtendedReg(MI.getOperand(1).getReg()))
690 // Emit segment override opcode prefix as needed.
691 EmitSegmentOverridePrefix(TSFlags, CurByte, MemOperand, MI, OS);
693 // VEX opcode prefix can have 2 or 3 bytes
696 // +-----+ +--------------+ +-------------------+
697 // | C4h | | RXB | m-mmmm | | W | vvvv | L | pp |
698 // +-----+ +--------------+ +-------------------+
700 // +-----+ +-------------------+
701 // | C5h | | R | vvvv | L | pp |
702 // +-----+ +-------------------+
704 unsigned char LastByte = VEX_PP | (VEX_L << 2) | (VEX_4V << 3);
706 if (VEX_B && VEX_X && !VEX_W && !XOP && (VEX_5M == 1)) { // 2 byte VEX prefix
707 EmitByte(0xC5, CurByte, OS);
708 EmitByte(LastByte | (VEX_R << 7), CurByte, OS);
713 EmitByte(XOP ? 0x8F : 0xC4, CurByte, OS);
714 EmitByte(VEX_R << 7 | VEX_X << 6 | VEX_B << 5 | VEX_5M, CurByte, OS);
715 EmitByte(LastByte | (VEX_W << 7), CurByte, OS);
718 /// DetermineREXPrefix - Determine if the MCInst has to be encoded with a X86-64
719 /// REX prefix which specifies 1) 64-bit instructions, 2) non-default operand
720 /// size, and 3) use of X86-64 extended registers.
721 static unsigned DetermineREXPrefix(const MCInst &MI, uint64_t TSFlags,
722 const MCInstrDesc &Desc) {
724 if (TSFlags & X86II::REX_W)
725 REX |= 1 << 3; // set REX.W
727 if (MI.getNumOperands() == 0) return REX;
729 unsigned NumOps = MI.getNumOperands();
730 // FIXME: MCInst should explicitize the two-addrness.
731 bool isTwoAddr = NumOps > 1 &&
732 Desc.getOperandConstraint(1, MCOI::TIED_TO) != -1;
734 // If it accesses SPL, BPL, SIL, or DIL, then it requires a 0x40 REX prefix.
735 unsigned i = isTwoAddr ? 1 : 0;
736 for (; i != NumOps; ++i) {
737 const MCOperand &MO = MI.getOperand(i);
738 if (!MO.isReg()) continue;
739 unsigned Reg = MO.getReg();
740 if (!X86II::isX86_64NonExtLowByteReg(Reg)) continue;
741 // FIXME: The caller of DetermineREXPrefix slaps this prefix onto anything
742 // that returns non-zero.
743 REX |= 0x40; // REX fixed encoding prefix
747 switch (TSFlags & X86II::FormMask) {
748 case X86II::MRMInitReg: llvm_unreachable("FIXME: Remove this!");
749 case X86II::MRMSrcReg:
750 if (MI.getOperand(0).isReg() &&
751 X86II::isX86_64ExtendedReg(MI.getOperand(0).getReg()))
752 REX |= 1 << 2; // set REX.R
753 i = isTwoAddr ? 2 : 1;
754 for (; i != NumOps; ++i) {
755 const MCOperand &MO = MI.getOperand(i);
756 if (MO.isReg() && X86II::isX86_64ExtendedReg(MO.getReg()))
757 REX |= 1 << 0; // set REX.B
760 case X86II::MRMSrcMem: {
761 if (MI.getOperand(0).isReg() &&
762 X86II::isX86_64ExtendedReg(MI.getOperand(0).getReg()))
763 REX |= 1 << 2; // set REX.R
765 i = isTwoAddr ? 2 : 1;
766 for (; i != NumOps; ++i) {
767 const MCOperand &MO = MI.getOperand(i);
769 if (X86II::isX86_64ExtendedReg(MO.getReg()))
770 REX |= 1 << Bit; // set REX.B (Bit=0) and REX.X (Bit=1)
776 case X86II::MRM0m: case X86II::MRM1m:
777 case X86II::MRM2m: case X86II::MRM3m:
778 case X86II::MRM4m: case X86II::MRM5m:
779 case X86II::MRM6m: case X86II::MRM7m:
780 case X86II::MRMDestMem: {
781 unsigned e = (isTwoAddr ? X86::AddrNumOperands+1 : X86::AddrNumOperands);
782 i = isTwoAddr ? 1 : 0;
783 if (NumOps > e && MI.getOperand(e).isReg() &&
784 X86II::isX86_64ExtendedReg(MI.getOperand(e).getReg()))
785 REX |= 1 << 2; // set REX.R
787 for (; i != e; ++i) {
788 const MCOperand &MO = MI.getOperand(i);
790 if (X86II::isX86_64ExtendedReg(MO.getReg()))
791 REX |= 1 << Bit; // REX.B (Bit=0) and REX.X (Bit=1)
798 if (MI.getOperand(0).isReg() &&
799 X86II::isX86_64ExtendedReg(MI.getOperand(0).getReg()))
800 REX |= 1 << 0; // set REX.B
801 i = isTwoAddr ? 2 : 1;
802 for (unsigned e = NumOps; i != e; ++i) {
803 const MCOperand &MO = MI.getOperand(i);
804 if (MO.isReg() && X86II::isX86_64ExtendedReg(MO.getReg()))
805 REX |= 1 << 2; // set REX.R
812 /// EmitSegmentOverridePrefix - Emit segment override opcode prefix as needed
813 void X86MCCodeEmitter::EmitSegmentOverridePrefix(uint64_t TSFlags,
814 unsigned &CurByte, int MemOperand,
816 raw_ostream &OS) const {
817 switch (TSFlags & X86II::SegOvrMask) {
818 default: llvm_unreachable("Invalid segment!");
820 // No segment override, check for explicit one on memory operand.
821 if (MemOperand != -1) { // If the instruction has a memory operand.
822 switch (MI.getOperand(MemOperand+X86::AddrSegmentReg).getReg()) {
823 default: llvm_unreachable("Unknown segment register!");
825 case X86::CS: EmitByte(0x2E, CurByte, OS); break;
826 case X86::SS: EmitByte(0x36, CurByte, OS); break;
827 case X86::DS: EmitByte(0x3E, CurByte, OS); break;
828 case X86::ES: EmitByte(0x26, CurByte, OS); break;
829 case X86::FS: EmitByte(0x64, CurByte, OS); break;
830 case X86::GS: EmitByte(0x65, CurByte, OS); break;
835 EmitByte(0x64, CurByte, OS);
838 EmitByte(0x65, CurByte, OS);
843 /// EmitOpcodePrefix - Emit all instruction prefixes prior to the opcode.
845 /// MemOperand is the operand # of the start of a memory operand if present. If
846 /// Not present, it is -1.
847 void X86MCCodeEmitter::EmitOpcodePrefix(uint64_t TSFlags, unsigned &CurByte,
848 int MemOperand, const MCInst &MI,
849 const MCInstrDesc &Desc,
850 raw_ostream &OS) const {
852 // Emit the lock opcode prefix as needed.
853 if (TSFlags & X86II::LOCK)
854 EmitByte(0xF0, CurByte, OS);
856 // Emit segment override opcode prefix as needed.
857 EmitSegmentOverridePrefix(TSFlags, CurByte, MemOperand, MI, OS);
859 // Emit the repeat opcode prefix as needed.
860 if ((TSFlags & X86II::Op0Mask) == X86II::REP)
861 EmitByte(0xF3, CurByte, OS);
863 // Emit the address size opcode prefix as needed.
864 bool need_address_override;
865 if (TSFlags & X86II::AdSize) {
866 need_address_override = true;
867 } else if (MemOperand == -1) {
868 need_address_override = false;
869 } else if (is64BitMode()) {
870 assert(!Is16BitMemOperand(MI, MemOperand));
871 need_address_override = Is32BitMemOperand(MI, MemOperand);
872 } else if (is32BitMode()) {
873 assert(!Is64BitMemOperand(MI, MemOperand));
874 need_address_override = Is16BitMemOperand(MI, MemOperand);
876 need_address_override = false;
879 if (need_address_override)
880 EmitByte(0x67, CurByte, OS);
882 // Emit the operand size opcode prefix as needed.
883 if (TSFlags & X86II::OpSize)
884 EmitByte(0x66, CurByte, OS);
886 bool Need0FPrefix = false;
887 switch (TSFlags & X86II::Op0Mask) {
888 default: llvm_unreachable("Invalid prefix!");
889 case 0: break; // No prefix!
890 case X86II::REP: break; // already handled.
891 case X86II::TB: // Two-byte opcode prefix
892 case X86II::T8: // 0F 38
893 case X86II::TA: // 0F 3A
894 case X86II::A6: // 0F A6
895 case X86II::A7: // 0F A7
898 case X86II::T8XS: // F3 0F 38
899 EmitByte(0xF3, CurByte, OS);
902 case X86II::T8XD: // F2 0F 38
903 EmitByte(0xF2, CurByte, OS);
906 case X86II::TAXD: // F2 0F 3A
907 EmitByte(0xF2, CurByte, OS);
910 case X86II::XS: // F3 0F
911 EmitByte(0xF3, CurByte, OS);
914 case X86II::XD: // F2 0F
915 EmitByte(0xF2, CurByte, OS);
918 case X86II::D8: EmitByte(0xD8, CurByte, OS); break;
919 case X86II::D9: EmitByte(0xD9, CurByte, OS); break;
920 case X86II::DA: EmitByte(0xDA, CurByte, OS); break;
921 case X86II::DB: EmitByte(0xDB, CurByte, OS); break;
922 case X86II::DC: EmitByte(0xDC, CurByte, OS); break;
923 case X86II::DD: EmitByte(0xDD, CurByte, OS); break;
924 case X86II::DE: EmitByte(0xDE, CurByte, OS); break;
925 case X86II::DF: EmitByte(0xDF, CurByte, OS); break;
928 // Handle REX prefix.
929 // FIXME: Can this come before F2 etc to simplify emission?
931 if (unsigned REX = DetermineREXPrefix(MI, TSFlags, Desc))
932 EmitByte(0x40 | REX, CurByte, OS);
935 // 0x0F escape code must be emitted just before the opcode.
937 EmitByte(0x0F, CurByte, OS);
939 // FIXME: Pull this up into previous switch if REX can be moved earlier.
940 switch (TSFlags & X86II::Op0Mask) {
941 case X86II::T8XS: // F3 0F 38
942 case X86II::T8XD: // F2 0F 38
943 case X86II::T8: // 0F 38
944 EmitByte(0x38, CurByte, OS);
946 case X86II::TAXD: // F2 0F 3A
947 case X86II::TA: // 0F 3A
948 EmitByte(0x3A, CurByte, OS);
950 case X86II::A6: // 0F A6
951 EmitByte(0xA6, CurByte, OS);
953 case X86II::A7: // 0F A7
954 EmitByte(0xA7, CurByte, OS);
959 void X86MCCodeEmitter::
960 EncodeInstruction(const MCInst &MI, raw_ostream &OS,
961 SmallVectorImpl<MCFixup> &Fixups) const {
962 unsigned Opcode = MI.getOpcode();
963 const MCInstrDesc &Desc = MCII.get(Opcode);
964 uint64_t TSFlags = Desc.TSFlags;
966 // Pseudo instructions don't get encoded.
967 if ((TSFlags & X86II::FormMask) == X86II::Pseudo)
970 // If this is a two-address instruction, skip one of the register operands.
971 // FIXME: This should be handled during MCInst lowering.
972 unsigned NumOps = Desc.getNumOperands();
974 if (NumOps > 1 && Desc.getOperandConstraint(1, MCOI::TIED_TO) != -1)
976 else if (NumOps > 2 && Desc.getOperandConstraint(NumOps-1, MCOI::TIED_TO)== 0)
977 // Skip the last source operand that is tied_to the dest reg. e.g. LXADD32
980 // Keep track of the current byte being emitted.
981 unsigned CurByte = 0;
983 // Is this instruction encoded using the AVX VEX prefix?
984 bool HasVEXPrefix = (TSFlags >> X86II::VEXShift) & X86II::VEX;
986 // It uses the VEX.VVVV field?
987 bool HasVEX_4V = (TSFlags >> X86II::VEXShift) & X86II::VEX_4V;
988 bool HasVEX_4VOp3 = (TSFlags >> X86II::VEXShift) & X86II::VEX_4VOp3;
989 bool HasMemOp4 = (TSFlags >> X86II::VEXShift) & X86II::MemOp4;
990 const unsigned MemOp4_I8IMMOperand = 2;
992 // Determine where the memory operand starts, if present.
993 int MemoryOperand = X86II::getMemoryOperandNo(TSFlags, Opcode);
994 if (MemoryOperand != -1) MemoryOperand += CurOp;
997 EmitOpcodePrefix(TSFlags, CurByte, MemoryOperand, MI, Desc, OS);
999 EmitVEXOpcodePrefix(TSFlags, CurByte, MemoryOperand, MI, Desc, OS);
1001 unsigned char BaseOpcode = X86II::getBaseOpcodeFor(TSFlags);
1003 if ((TSFlags >> X86II::VEXShift) & X86II::Has3DNow0F0FOpcode)
1004 BaseOpcode = 0x0F; // Weird 3DNow! encoding.
1006 unsigned SrcRegNum = 0;
1007 switch (TSFlags & X86II::FormMask) {
1008 case X86II::MRMInitReg:
1009 llvm_unreachable("FIXME: Remove this form when the JIT moves to MCCodeEmitter!");
1010 default: errs() << "FORM: " << (TSFlags & X86II::FormMask) << "\n";
1011 llvm_unreachable("Unknown FormMask value in X86MCCodeEmitter!");
1013 llvm_unreachable("Pseudo instruction shouldn't be emitted");
1015 EmitByte(BaseOpcode, CurByte, OS);
1017 case X86II::RawFrmImm8:
1018 EmitByte(BaseOpcode, CurByte, OS);
1019 EmitImmediate(MI.getOperand(CurOp++), MI.getLoc(),
1020 X86II::getSizeOfImm(TSFlags), getImmFixupKind(TSFlags),
1021 CurByte, OS, Fixups);
1022 EmitImmediate(MI.getOperand(CurOp++), MI.getLoc(), 1, FK_Data_1, CurByte,
1025 case X86II::RawFrmImm16:
1026 EmitByte(BaseOpcode, CurByte, OS);
1027 EmitImmediate(MI.getOperand(CurOp++), MI.getLoc(),
1028 X86II::getSizeOfImm(TSFlags), getImmFixupKind(TSFlags),
1029 CurByte, OS, Fixups);
1030 EmitImmediate(MI.getOperand(CurOp++), MI.getLoc(), 2, FK_Data_2, CurByte,
1034 case X86II::AddRegFrm:
1035 EmitByte(BaseOpcode + GetX86RegNum(MI.getOperand(CurOp++)), CurByte, OS);
1038 case X86II::MRMDestReg:
1039 EmitByte(BaseOpcode, CurByte, OS);
1040 EmitRegModRMByte(MI.getOperand(CurOp),
1041 GetX86RegNum(MI.getOperand(CurOp+1)), CurByte, OS);
1045 case X86II::MRMDestMem:
1046 EmitByte(BaseOpcode, CurByte, OS);
1047 SrcRegNum = CurOp + X86::AddrNumOperands;
1049 if (HasVEX_4V) // Skip 1st src (which is encoded in VEX_VVVV)
1052 EmitMemModRMByte(MI, CurOp,
1053 GetX86RegNum(MI.getOperand(SrcRegNum)),
1054 TSFlags, CurByte, OS, Fixups);
1055 CurOp = SrcRegNum + 1;
1058 case X86II::MRMSrcReg:
1059 EmitByte(BaseOpcode, CurByte, OS);
1060 SrcRegNum = CurOp + 1;
1062 if (HasVEX_4V) // Skip 1st src (which is encoded in VEX_VVVV)
1065 if (HasMemOp4) // Skip 2nd src (which is encoded in I8IMM)
1068 EmitRegModRMByte(MI.getOperand(SrcRegNum),
1069 GetX86RegNum(MI.getOperand(CurOp)), CurByte, OS);
1071 // 2 operands skipped with HasMemOp4, compensate accordingly
1072 CurOp = HasMemOp4 ? SrcRegNum : SrcRegNum + 1;
1077 case X86II::MRMSrcMem: {
1078 int AddrOperands = X86::AddrNumOperands;
1079 unsigned FirstMemOp = CurOp+1;
1082 ++FirstMemOp; // Skip the register source (which is encoded in VEX_VVVV).
1084 if (HasMemOp4) // Skip second register source (encoded in I8IMM)
1087 EmitByte(BaseOpcode, CurByte, OS);
1089 EmitMemModRMByte(MI, FirstMemOp, GetX86RegNum(MI.getOperand(CurOp)),
1090 TSFlags, CurByte, OS, Fixups);
1091 CurOp += AddrOperands + 1;
1097 case X86II::MRM0r: case X86II::MRM1r:
1098 case X86II::MRM2r: case X86II::MRM3r:
1099 case X86II::MRM4r: case X86II::MRM5r:
1100 case X86II::MRM6r: case X86II::MRM7r:
1101 if (HasVEX_4V) // Skip the register dst (which is encoded in VEX_VVVV).
1103 EmitByte(BaseOpcode, CurByte, OS);
1104 EmitRegModRMByte(MI.getOperand(CurOp++),
1105 (TSFlags & X86II::FormMask)-X86II::MRM0r,
1108 case X86II::MRM0m: case X86II::MRM1m:
1109 case X86II::MRM2m: case X86II::MRM3m:
1110 case X86II::MRM4m: case X86II::MRM5m:
1111 case X86II::MRM6m: case X86II::MRM7m:
1112 if (HasVEX_4V) // Skip the register dst (which is encoded in VEX_VVVV).
1114 EmitByte(BaseOpcode, CurByte, OS);
1115 EmitMemModRMByte(MI, CurOp, (TSFlags & X86II::FormMask)-X86II::MRM0m,
1116 TSFlags, CurByte, OS, Fixups);
1117 CurOp += X86::AddrNumOperands;
1119 case X86II::MRM_C1: case X86II::MRM_C2:
1120 case X86II::MRM_C3: case X86II::MRM_C4:
1121 case X86II::MRM_C8: case X86II::MRM_C9:
1122 case X86II::MRM_D0: case X86II::MRM_D1:
1123 case X86II::MRM_D4: case X86II::MRM_D8:
1124 case X86II::MRM_D9: case X86II::MRM_DA:
1125 case X86II::MRM_DB: case X86II::MRM_DC:
1126 case X86II::MRM_DD: case X86II::MRM_DE:
1127 case X86II::MRM_DF: case X86II::MRM_E8:
1128 case X86II::MRM_F0: case X86II::MRM_F8:
1130 EmitByte(BaseOpcode, CurByte, OS);
1133 switch (TSFlags & X86II::FormMask) {
1134 default: llvm_unreachable("Invalid Form");
1135 case X86II::MRM_C1: MRM = 0xC1; break;
1136 case X86II::MRM_C2: MRM = 0xC2; break;
1137 case X86II::MRM_C3: MRM = 0xC3; break;
1138 case X86II::MRM_C4: MRM = 0xC4; break;
1139 case X86II::MRM_C8: MRM = 0xC8; break;
1140 case X86II::MRM_C9: MRM = 0xC9; break;
1141 case X86II::MRM_D0: MRM = 0xD0; break;
1142 case X86II::MRM_D1: MRM = 0xD1; break;
1143 case X86II::MRM_D4: MRM = 0xD4; break;
1144 case X86II::MRM_D8: MRM = 0xD8; break;
1145 case X86II::MRM_D9: MRM = 0xD9; break;
1146 case X86II::MRM_DA: MRM = 0xDA; break;
1147 case X86II::MRM_DB: MRM = 0xDB; break;
1148 case X86II::MRM_DC: MRM = 0xDC; break;
1149 case X86II::MRM_DD: MRM = 0xDD; break;
1150 case X86II::MRM_DE: MRM = 0xDE; break;
1151 case X86II::MRM_DF: MRM = 0xDF; break;
1152 case X86II::MRM_E8: MRM = 0xE8; break;
1153 case X86II::MRM_F0: MRM = 0xF0; break;
1154 case X86II::MRM_F8: MRM = 0xF8; break;
1155 case X86II::MRM_F9: MRM = 0xF9; break;
1157 EmitByte(MRM, CurByte, OS);
1161 // If there is a remaining operand, it must be a trailing immediate. Emit it
1162 // according to the right size for the instruction. Some instructions
1163 // (SSE4a extrq and insertq) have two trailing immediates.
1164 while (CurOp != NumOps && NumOps - CurOp <= 2) {
1165 // The last source register of a 4 operand instruction in AVX is encoded
1166 // in bits[7:4] of a immediate byte.
1167 if ((TSFlags >> X86II::VEXShift) & X86II::VEX_I8IMM) {
1168 const MCOperand &MO = MI.getOperand(HasMemOp4 ? MemOp4_I8IMMOperand
1171 unsigned RegNum = GetX86RegNum(MO) << 4;
1172 if (X86II::isX86_64ExtendedReg(MO.getReg()))
1174 // If there is an additional 5th operand it must be an immediate, which
1175 // is encoded in bits[3:0]
1176 if (CurOp != NumOps) {
1177 const MCOperand &MIMM = MI.getOperand(CurOp++);
1179 unsigned Val = MIMM.getImm();
1180 assert(Val < 16 && "Immediate operand value out of range");
1184 EmitImmediate(MCOperand::CreateImm(RegNum), MI.getLoc(), 1, FK_Data_1,
1185 CurByte, OS, Fixups);
1188 // FIXME: Is there a better way to know that we need a signed relocation?
1189 if (MI.getOpcode() == X86::ADD64ri32 ||
1190 MI.getOpcode() == X86::MOV64ri32 ||
1191 MI.getOpcode() == X86::MOV64mi32 ||
1192 MI.getOpcode() == X86::PUSH64i32)
1193 FixupKind = X86::reloc_signed_4byte;
1195 FixupKind = getImmFixupKind(TSFlags);
1196 EmitImmediate(MI.getOperand(CurOp++), MI.getLoc(),
1197 X86II::getSizeOfImm(TSFlags), MCFixupKind(FixupKind),
1198 CurByte, OS, Fixups);
1202 if ((TSFlags >> X86II::VEXShift) & X86II::Has3DNow0F0FOpcode)
1203 EmitByte(X86II::getBaseOpcodeFor(TSFlags), CurByte, OS);
1207 if (/*!Desc.isVariadic() &&*/ CurOp != NumOps) {
1208 errs() << "Cannot encode all operands of: ";