1 //===-- MipsMCCodeEmitter.cpp - Convert Mips 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 MipsMCCodeEmitter class.
12 //===----------------------------------------------------------------------===//
15 #include "MipsMCCodeEmitter.h"
16 #include "MCTargetDesc/MipsFixupKinds.h"
17 #include "MCTargetDesc/MipsMCExpr.h"
18 #include "MCTargetDesc/MipsMCTargetDesc.h"
19 #include "llvm/ADT/APFloat.h"
20 #include "llvm/ADT/SmallVector.h"
21 #include "llvm/MC/MCContext.h"
22 #include "llvm/MC/MCExpr.h"
23 #include "llvm/MC/MCInst.h"
24 #include "llvm/MC/MCInstrInfo.h"
25 #include "llvm/MC/MCFixup.h"
26 #include "llvm/MC/MCSubtargetInfo.h"
27 #include "llvm/Support/raw_ostream.h"
29 #define DEBUG_TYPE "mccodeemitter"
31 #define GET_INSTRMAP_INFO
32 #include "MipsGenInstrInfo.inc"
33 #undef GET_INSTRMAP_INFO
36 MCCodeEmitter *createMipsMCCodeEmitterEB(const MCInstrInfo &MCII,
37 const MCRegisterInfo &MRI,
38 const MCSubtargetInfo &STI,
40 return new MipsMCCodeEmitter(MCII, Ctx, false);
43 MCCodeEmitter *createMipsMCCodeEmitterEL(const MCInstrInfo &MCII,
44 const MCRegisterInfo &MRI,
45 const MCSubtargetInfo &STI,
47 return new MipsMCCodeEmitter(MCII, Ctx, true);
49 } // End of namespace llvm.
51 // If the D<shift> instruction has a shift amount that is greater
52 // than 31 (checked in calling routine), lower it to a D<shift>32 instruction
53 static void LowerLargeShift(MCInst& Inst) {
55 assert(Inst.getNumOperands() == 3 && "Invalid no. of operands for shift!");
56 assert(Inst.getOperand(2).isImm());
58 int64_t Shift = Inst.getOperand(2).getImm();
64 Inst.getOperand(2).setImm(Shift);
66 switch (Inst.getOpcode()) {
68 // Calling function is not synchronized
69 llvm_unreachable("Unexpected shift instruction");
71 Inst.setOpcode(Mips::DSLL32);
74 Inst.setOpcode(Mips::DSRL32);
77 Inst.setOpcode(Mips::DSRA32);
80 Inst.setOpcode(Mips::DROTR32);
85 // Pick a DEXT or DINS instruction variant based on the pos and size operands
86 static void LowerDextDins(MCInst& InstIn) {
87 int Opcode = InstIn.getOpcode();
89 if (Opcode == Mips::DEXT)
90 assert(InstIn.getNumOperands() == 4 &&
91 "Invalid no. of machine operands for DEXT!");
92 else // Only DEXT and DINS are possible
93 assert(InstIn.getNumOperands() == 5 &&
94 "Invalid no. of machine operands for DINS!");
96 assert(InstIn.getOperand(2).isImm());
97 int64_t pos = InstIn.getOperand(2).getImm();
98 assert(InstIn.getOperand(3).isImm());
99 int64_t size = InstIn.getOperand(3).getImm();
102 if (pos < 32) // DEXT/DINS, do nothing
105 InstIn.getOperand(2).setImm(pos - 32);
106 InstIn.setOpcode((Opcode == Mips::DEXT) ? Mips::DEXTU : Mips::DINSU);
110 assert(pos < 32 && "DEXT/DINS cannot have both size and pos > 32");
111 InstIn.getOperand(3).setImm(size - 32);
112 InstIn.setOpcode((Opcode == Mips::DEXT) ? Mips::DEXTM : Mips::DINSM);
116 bool MipsMCCodeEmitter::isMicroMips(const MCSubtargetInfo &STI) const {
117 return STI.getFeatureBits() & Mips::FeatureMicroMips;
120 void MipsMCCodeEmitter::EmitByte(unsigned char C, raw_ostream &OS) const {
124 void MipsMCCodeEmitter::EmitInstruction(uint64_t Val, unsigned Size,
125 const MCSubtargetInfo &STI,
126 raw_ostream &OS) const {
127 // Output the instruction encoding in little endian byte order.
128 // Little-endian byte ordering:
129 // mips32r2: 4 | 3 | 2 | 1
130 // microMIPS: 2 | 1 | 4 | 3
131 if (IsLittleEndian && Size == 4 && isMicroMips(STI)) {
132 EmitInstruction(Val >> 16, 2, STI, OS);
133 EmitInstruction(Val, 2, STI, OS);
135 for (unsigned i = 0; i < Size; ++i) {
136 unsigned Shift = IsLittleEndian ? i * 8 : (Size - 1 - i) * 8;
137 EmitByte((Val >> Shift) & 0xff, OS);
142 /// EncodeInstruction - Emit the instruction.
143 /// Size the instruction with Desc.getSize().
144 void MipsMCCodeEmitter::
145 EncodeInstruction(const MCInst &MI, raw_ostream &OS,
146 SmallVectorImpl<MCFixup> &Fixups,
147 const MCSubtargetInfo &STI) const
150 // Non-pseudo instructions that get changed for direct object
151 // only based on operand values.
152 // If this list of instructions get much longer we will move
153 // the check to a function call. Until then, this is more efficient.
155 switch (MI.getOpcode()) {
156 // If shift amount is >= 32 it the inst needs to be lowered further
161 LowerLargeShift(TmpInst);
163 // Double extract instruction is chosen by pos and size operands
166 LowerDextDins(TmpInst);
169 unsigned long N = Fixups.size();
170 uint32_t Binary = getBinaryCodeForInstr(TmpInst, Fixups, STI);
172 // Check for unimplemented opcodes.
173 // Unfortunately in MIPS both NOP and SLL will come in with Binary == 0
174 // so we have to special check for them.
175 unsigned Opcode = TmpInst.getOpcode();
176 if ((Opcode != Mips::NOP) && (Opcode != Mips::SLL) && !Binary)
177 llvm_unreachable("unimplemented opcode in EncodeInstruction()");
179 if (STI.getFeatureBits() & Mips::FeatureMicroMips) {
180 int NewOpcode = Mips::Std2MicroMips (Opcode, Mips::Arch_micromips);
181 if (NewOpcode != -1) {
182 if (Fixups.size() > N)
185 TmpInst.setOpcode (NewOpcode);
186 Binary = getBinaryCodeForInstr(TmpInst, Fixups, STI);
190 const MCInstrDesc &Desc = MCII.get(TmpInst.getOpcode());
192 // Get byte count of instruction
193 unsigned Size = Desc.getSize();
195 llvm_unreachable("Desc.getSize() returns 0");
197 EmitInstruction(Binary, Size, STI, OS);
200 /// getBranchTargetOpValue - Return binary encoding of the branch
201 /// target operand. If the machine operand requires relocation,
202 /// record the relocation and return zero.
203 unsigned MipsMCCodeEmitter::
204 getBranchTargetOpValue(const MCInst &MI, unsigned OpNo,
205 SmallVectorImpl<MCFixup> &Fixups,
206 const MCSubtargetInfo &STI) const {
208 const MCOperand &MO = MI.getOperand(OpNo);
210 // If the destination is an immediate, divide by 4.
211 if (MO.isImm()) return MO.getImm() >> 2;
213 assert(MO.isExpr() &&
214 "getBranchTargetOpValue expects only expressions or immediates");
216 const MCExpr *Expr = MO.getExpr();
217 Fixups.push_back(MCFixup::Create(0, Expr,
218 MCFixupKind(Mips::fixup_Mips_PC16)));
222 /// getBranchTargetOpValue - Return binary encoding of the microMIPS branch
223 /// target operand. If the machine operand requires relocation,
224 /// record the relocation and return zero.
225 unsigned MipsMCCodeEmitter::
226 getBranchTargetOpValueMM(const MCInst &MI, unsigned OpNo,
227 SmallVectorImpl<MCFixup> &Fixups,
228 const MCSubtargetInfo &STI) const {
230 const MCOperand &MO = MI.getOperand(OpNo);
232 // If the destination is an immediate, divide by 2.
233 if (MO.isImm()) return MO.getImm() >> 1;
235 assert(MO.isExpr() &&
236 "getBranchTargetOpValueMM expects only expressions or immediates");
238 const MCExpr *Expr = MO.getExpr();
239 Fixups.push_back(MCFixup::Create(0, Expr,
241 fixup_MICROMIPS_PC16_S1)));
245 /// getBranchTarget21OpValue - Return binary encoding of the branch
246 /// target operand. If the machine operand requires relocation,
247 /// record the relocation and return zero.
248 unsigned MipsMCCodeEmitter::
249 getBranchTarget21OpValue(const MCInst &MI, unsigned OpNo,
250 SmallVectorImpl<MCFixup> &Fixups,
251 const MCSubtargetInfo &STI) const {
253 const MCOperand &MO = MI.getOperand(OpNo);
255 // If the destination is an immediate, divide by 4.
256 if (MO.isImm()) return MO.getImm() >> 2;
258 assert(MO.isExpr() &&
259 "getBranchTarget21OpValue expects only expressions or immediates");
261 const MCExpr *Expr = MO.getExpr();
262 Fixups.push_back(MCFixup::Create(0, Expr,
263 MCFixupKind(Mips::fixup_MIPS_PC21_S2)));
267 /// getBranchTarget26OpValue - Return binary encoding of the branch
268 /// target operand. If the machine operand requires relocation,
269 /// record the relocation and return zero.
270 unsigned MipsMCCodeEmitter::
271 getBranchTarget26OpValue(const MCInst &MI, unsigned OpNo,
272 SmallVectorImpl<MCFixup> &Fixups,
273 const MCSubtargetInfo &STI) const {
275 const MCOperand &MO = MI.getOperand(OpNo);
277 // If the destination is an immediate, divide by 4.
278 if (MO.isImm()) return MO.getImm() >> 2;
280 assert(MO.isExpr() &&
281 "getBranchTarget26OpValue expects only expressions or immediates");
283 const MCExpr *Expr = MO.getExpr();
284 Fixups.push_back(MCFixup::Create(0, Expr,
285 MCFixupKind(Mips::fixup_MIPS_PC26_S2)));
289 /// getJumpOffset16OpValue - Return binary encoding of the jump
290 /// target operand. If the machine operand requires relocation,
291 /// record the relocation and return zero.
292 unsigned MipsMCCodeEmitter::
293 getJumpOffset16OpValue(const MCInst &MI, unsigned OpNo,
294 SmallVectorImpl<MCFixup> &Fixups,
295 const MCSubtargetInfo &STI) const {
297 const MCOperand &MO = MI.getOperand(OpNo);
299 if (MO.isImm()) return MO.getImm();
301 assert(MO.isExpr() &&
302 "getJumpOffset16OpValue expects only expressions or an immediate");
308 /// getJumpTargetOpValue - Return binary encoding of the jump
309 /// target operand. If the machine operand requires relocation,
310 /// record the relocation and return zero.
311 unsigned MipsMCCodeEmitter::
312 getJumpTargetOpValue(const MCInst &MI, unsigned OpNo,
313 SmallVectorImpl<MCFixup> &Fixups,
314 const MCSubtargetInfo &STI) const {
316 const MCOperand &MO = MI.getOperand(OpNo);
317 // If the destination is an immediate, divide by 4.
318 if (MO.isImm()) return MO.getImm()>>2;
320 assert(MO.isExpr() &&
321 "getJumpTargetOpValue expects only expressions or an immediate");
323 const MCExpr *Expr = MO.getExpr();
324 Fixups.push_back(MCFixup::Create(0, Expr,
325 MCFixupKind(Mips::fixup_Mips_26)));
329 unsigned MipsMCCodeEmitter::
330 getJumpTargetOpValueMM(const MCInst &MI, unsigned OpNo,
331 SmallVectorImpl<MCFixup> &Fixups,
332 const MCSubtargetInfo &STI) const {
334 const MCOperand &MO = MI.getOperand(OpNo);
335 // If the destination is an immediate, divide by 2.
336 if (MO.isImm()) return MO.getImm() >> 1;
338 assert(MO.isExpr() &&
339 "getJumpTargetOpValueMM expects only expressions or an immediate");
341 const MCExpr *Expr = MO.getExpr();
342 Fixups.push_back(MCFixup::Create(0, Expr,
343 MCFixupKind(Mips::fixup_MICROMIPS_26_S1)));
347 unsigned MipsMCCodeEmitter::
348 getUImm5Lsl2Encoding(const MCInst &MI, unsigned OpNo,
349 SmallVectorImpl<MCFixup> &Fixups,
350 const MCSubtargetInfo &STI) const {
352 const MCOperand &MO = MI.getOperand(OpNo);
354 // The immediate is encoded as 'immediate << 2'.
355 unsigned Res = getMachineOpValue(MI, MO, Fixups, STI);
356 assert((Res & 3) == 0);
360 assert(MO.isExpr() &&
361 "getUImm5Lsl2Encoding expects only expressions or an immediate");
366 unsigned MipsMCCodeEmitter::
367 getSImm9AddiuspValue(const MCInst &MI, unsigned OpNo,
368 SmallVectorImpl<MCFixup> &Fixups,
369 const MCSubtargetInfo &STI) const {
371 const MCOperand &MO = MI.getOperand(OpNo);
373 unsigned Binary = (MO.getImm() >> 2) & 0x0000ffff;
374 return (((Binary & 0x8000) >> 7) | (Binary & 0x00ff));
380 unsigned MipsMCCodeEmitter::
381 getExprOpValue(const MCExpr *Expr,SmallVectorImpl<MCFixup> &Fixups,
382 const MCSubtargetInfo &STI) const {
385 if (Expr->EvaluateAsAbsolute(Res))
388 MCExpr::ExprKind Kind = Expr->getKind();
389 if (Kind == MCExpr::Constant) {
390 return cast<MCConstantExpr>(Expr)->getValue();
393 if (Kind == MCExpr::Binary) {
394 unsigned Res = getExprOpValue(cast<MCBinaryExpr>(Expr)->getLHS(), Fixups, STI);
395 Res += getExprOpValue(cast<MCBinaryExpr>(Expr)->getRHS(), Fixups, STI);
399 if (Kind == MCExpr::Target) {
400 const MipsMCExpr *MipsExpr = cast<MipsMCExpr>(Expr);
402 Mips::Fixups FixupKind = Mips::Fixups(0);
403 switch (MipsExpr->getKind()) {
404 default: llvm_unreachable("Unsupported fixup kind for target expression!");
405 case MipsMCExpr::VK_Mips_HIGHEST:
406 FixupKind = Mips::fixup_Mips_HIGHEST;
408 case MipsMCExpr::VK_Mips_HIGHER:
409 FixupKind = Mips::fixup_Mips_HIGHER;
411 case MipsMCExpr::VK_Mips_HI:
412 FixupKind = isMicroMips(STI) ? Mips::fixup_MICROMIPS_HI16
413 : Mips::fixup_Mips_HI16;
415 case MipsMCExpr::VK_Mips_LO:
416 FixupKind = isMicroMips(STI) ? Mips::fixup_MICROMIPS_LO16
417 : Mips::fixup_Mips_LO16;
420 Fixups.push_back(MCFixup::Create(0, MipsExpr, MCFixupKind(FixupKind)));
424 if (Kind == MCExpr::SymbolRef) {
425 Mips::Fixups FixupKind = Mips::Fixups(0);
427 switch(cast<MCSymbolRefExpr>(Expr)->getKind()) {
428 default: llvm_unreachable("Unknown fixup kind!");
430 case MCSymbolRefExpr::VK_Mips_GPOFF_HI :
431 FixupKind = Mips::fixup_Mips_GPOFF_HI;
433 case MCSymbolRefExpr::VK_Mips_GPOFF_LO :
434 FixupKind = Mips::fixup_Mips_GPOFF_LO;
436 case MCSymbolRefExpr::VK_Mips_GOT_PAGE :
437 FixupKind = isMicroMips(STI) ? Mips::fixup_MICROMIPS_GOT_PAGE
438 : Mips::fixup_Mips_GOT_PAGE;
440 case MCSymbolRefExpr::VK_Mips_GOT_OFST :
441 FixupKind = isMicroMips(STI) ? Mips::fixup_MICROMIPS_GOT_OFST
442 : Mips::fixup_Mips_GOT_OFST;
444 case MCSymbolRefExpr::VK_Mips_GOT_DISP :
445 FixupKind = isMicroMips(STI) ? Mips::fixup_MICROMIPS_GOT_DISP
446 : Mips::fixup_Mips_GOT_DISP;
448 case MCSymbolRefExpr::VK_Mips_GPREL:
449 FixupKind = Mips::fixup_Mips_GPREL16;
451 case MCSymbolRefExpr::VK_Mips_GOT_CALL:
452 FixupKind = isMicroMips(STI) ? Mips::fixup_MICROMIPS_CALL16
453 : Mips::fixup_Mips_CALL16;
455 case MCSymbolRefExpr::VK_Mips_GOT16:
456 FixupKind = isMicroMips(STI) ? Mips::fixup_MICROMIPS_GOT16
457 : Mips::fixup_Mips_GOT_Global;
459 case MCSymbolRefExpr::VK_Mips_GOT:
460 FixupKind = isMicroMips(STI) ? Mips::fixup_MICROMIPS_GOT16
461 : Mips::fixup_Mips_GOT_Local;
463 case MCSymbolRefExpr::VK_Mips_ABS_HI:
464 FixupKind = isMicroMips(STI) ? Mips::fixup_MICROMIPS_HI16
465 : Mips::fixup_Mips_HI16;
467 case MCSymbolRefExpr::VK_Mips_ABS_LO:
468 FixupKind = isMicroMips(STI) ? Mips::fixup_MICROMIPS_LO16
469 : Mips::fixup_Mips_LO16;
471 case MCSymbolRefExpr::VK_Mips_TLSGD:
472 FixupKind = isMicroMips(STI) ? Mips::fixup_MICROMIPS_TLS_GD
473 : Mips::fixup_Mips_TLSGD;
475 case MCSymbolRefExpr::VK_Mips_TLSLDM:
476 FixupKind = isMicroMips(STI) ? Mips::fixup_MICROMIPS_TLS_LDM
477 : Mips::fixup_Mips_TLSLDM;
479 case MCSymbolRefExpr::VK_Mips_DTPREL_HI:
480 FixupKind = isMicroMips(STI) ? Mips::fixup_MICROMIPS_TLS_DTPREL_HI16
481 : Mips::fixup_Mips_DTPREL_HI;
483 case MCSymbolRefExpr::VK_Mips_DTPREL_LO:
484 FixupKind = isMicroMips(STI) ? Mips::fixup_MICROMIPS_TLS_DTPREL_LO16
485 : Mips::fixup_Mips_DTPREL_LO;
487 case MCSymbolRefExpr::VK_Mips_GOTTPREL:
488 FixupKind = Mips::fixup_Mips_GOTTPREL;
490 case MCSymbolRefExpr::VK_Mips_TPREL_HI:
491 FixupKind = isMicroMips(STI) ? Mips::fixup_MICROMIPS_TLS_TPREL_HI16
492 : Mips::fixup_Mips_TPREL_HI;
494 case MCSymbolRefExpr::VK_Mips_TPREL_LO:
495 FixupKind = isMicroMips(STI) ? Mips::fixup_MICROMIPS_TLS_TPREL_LO16
496 : Mips::fixup_Mips_TPREL_LO;
498 case MCSymbolRefExpr::VK_Mips_HIGHER:
499 FixupKind = Mips::fixup_Mips_HIGHER;
501 case MCSymbolRefExpr::VK_Mips_HIGHEST:
502 FixupKind = Mips::fixup_Mips_HIGHEST;
504 case MCSymbolRefExpr::VK_Mips_GOT_HI16:
505 FixupKind = Mips::fixup_Mips_GOT_HI16;
507 case MCSymbolRefExpr::VK_Mips_GOT_LO16:
508 FixupKind = Mips::fixup_Mips_GOT_LO16;
510 case MCSymbolRefExpr::VK_Mips_CALL_HI16:
511 FixupKind = Mips::fixup_Mips_CALL_HI16;
513 case MCSymbolRefExpr::VK_Mips_CALL_LO16:
514 FixupKind = Mips::fixup_Mips_CALL_LO16;
516 case MCSymbolRefExpr::VK_Mips_PCREL_HI16:
517 FixupKind = Mips::fixup_MIPS_PCHI16;
519 case MCSymbolRefExpr::VK_Mips_PCREL_LO16:
520 FixupKind = Mips::fixup_MIPS_PCLO16;
524 Fixups.push_back(MCFixup::Create(0, Expr, MCFixupKind(FixupKind)));
530 /// getMachineOpValue - Return binary encoding of operand. If the machine
531 /// operand requires relocation, record the relocation and return zero.
532 unsigned MipsMCCodeEmitter::
533 getMachineOpValue(const MCInst &MI, const MCOperand &MO,
534 SmallVectorImpl<MCFixup> &Fixups,
535 const MCSubtargetInfo &STI) const {
537 unsigned Reg = MO.getReg();
538 unsigned RegNo = Ctx.getRegisterInfo()->getEncodingValue(Reg);
540 } else if (MO.isImm()) {
541 return static_cast<unsigned>(MO.getImm());
542 } else if (MO.isFPImm()) {
543 return static_cast<unsigned>(APFloat(MO.getFPImm())
544 .bitcastToAPInt().getHiBits(32).getLimitedValue());
546 // MO must be an Expr.
548 return getExprOpValue(MO.getExpr(),Fixups, STI);
551 /// getMSAMemEncoding - Return binary encoding of memory operand for LD/ST
554 MipsMCCodeEmitter::getMSAMemEncoding(const MCInst &MI, unsigned OpNo,
555 SmallVectorImpl<MCFixup> &Fixups,
556 const MCSubtargetInfo &STI) const {
557 // Base register is encoded in bits 20-16, offset is encoded in bits 15-0.
558 assert(MI.getOperand(OpNo).isReg());
559 unsigned RegBits = getMachineOpValue(MI, MI.getOperand(OpNo),Fixups, STI) << 16;
560 unsigned OffBits = getMachineOpValue(MI, MI.getOperand(OpNo+1), Fixups, STI);
562 // The immediate field of an LD/ST instruction is scaled which means it must
563 // be divided (when encoding) by the size (in bytes) of the instructions'
569 switch(MI.getOpcode())
572 assert (0 && "Unexpected instruction");
576 // We don't need to scale the offset in this case
592 return (OffBits & 0xFFFF) | RegBits;
595 /// getMemEncoding - Return binary encoding of memory related operand.
596 /// If the offset operand requires relocation, record the relocation.
598 MipsMCCodeEmitter::getMemEncoding(const MCInst &MI, unsigned OpNo,
599 SmallVectorImpl<MCFixup> &Fixups,
600 const MCSubtargetInfo &STI) const {
601 // Base register is encoded in bits 20-16, offset is encoded in bits 15-0.
602 assert(MI.getOperand(OpNo).isReg());
603 unsigned RegBits = getMachineOpValue(MI, MI.getOperand(OpNo),Fixups, STI) << 16;
604 unsigned OffBits = getMachineOpValue(MI, MI.getOperand(OpNo+1), Fixups, STI);
606 return (OffBits & 0xFFFF) | RegBits;
609 unsigned MipsMCCodeEmitter::
610 getMemEncodingMMImm12(const MCInst &MI, unsigned OpNo,
611 SmallVectorImpl<MCFixup> &Fixups,
612 const MCSubtargetInfo &STI) const {
613 // Base register is encoded in bits 20-16, offset is encoded in bits 11-0.
614 assert(MI.getOperand(OpNo).isReg());
615 unsigned RegBits = getMachineOpValue(MI, MI.getOperand(OpNo), Fixups, STI) << 16;
616 unsigned OffBits = getMachineOpValue(MI, MI.getOperand(OpNo+1), Fixups, STI);
618 return (OffBits & 0x0FFF) | RegBits;
622 MipsMCCodeEmitter::getSizeExtEncoding(const MCInst &MI, unsigned OpNo,
623 SmallVectorImpl<MCFixup> &Fixups,
624 const MCSubtargetInfo &STI) const {
625 assert(MI.getOperand(OpNo).isImm());
626 unsigned SizeEncoding = getMachineOpValue(MI, MI.getOperand(OpNo), Fixups, STI);
627 return SizeEncoding - 1;
630 // FIXME: should be called getMSBEncoding
633 MipsMCCodeEmitter::getSizeInsEncoding(const MCInst &MI, unsigned OpNo,
634 SmallVectorImpl<MCFixup> &Fixups,
635 const MCSubtargetInfo &STI) const {
636 assert(MI.getOperand(OpNo-1).isImm());
637 assert(MI.getOperand(OpNo).isImm());
638 unsigned Position = getMachineOpValue(MI, MI.getOperand(OpNo-1), Fixups, STI);
639 unsigned Size = getMachineOpValue(MI, MI.getOperand(OpNo), Fixups, STI);
641 return Position + Size - 1;
645 MipsMCCodeEmitter::getLSAImmEncoding(const MCInst &MI, unsigned OpNo,
646 SmallVectorImpl<MCFixup> &Fixups,
647 const MCSubtargetInfo &STI) const {
648 assert(MI.getOperand(OpNo).isImm());
649 // The immediate is encoded as 'immediate - 1'.
650 return getMachineOpValue(MI, MI.getOperand(OpNo), Fixups, STI) - 1;
654 MipsMCCodeEmitter::getSimm19Lsl2Encoding(const MCInst &MI, unsigned OpNo,
655 SmallVectorImpl<MCFixup> &Fixups,
656 const MCSubtargetInfo &STI) const {
657 const MCOperand &MO = MI.getOperand(OpNo);
659 // The immediate is encoded as 'immediate << 2'.
660 unsigned Res = getMachineOpValue(MI, MO, Fixups, STI);
661 assert((Res & 3) == 0);
665 assert(MO.isExpr() &&
666 "getSimm19Lsl2Encoding expects only expressions or an immediate");
668 const MCExpr *Expr = MO.getExpr();
669 Fixups.push_back(MCFixup::Create(0, Expr,
670 MCFixupKind(Mips::fixup_MIPS_PC19_S2)));
675 MipsMCCodeEmitter::getSimm18Lsl3Encoding(const MCInst &MI, unsigned OpNo,
676 SmallVectorImpl<MCFixup> &Fixups,
677 const MCSubtargetInfo &STI) const {
678 const MCOperand &MO = MI.getOperand(OpNo);
680 // The immediate is encoded as 'immediate << 3'.
681 unsigned Res = getMachineOpValue(MI, MI.getOperand(OpNo), Fixups, STI);
682 assert((Res & 7) == 0);
686 assert(MO.isExpr() &&
687 "getSimm18Lsl2Encoding expects only expressions or an immediate");
689 const MCExpr *Expr = MO.getExpr();
690 Fixups.push_back(MCFixup::Create(0, Expr,
691 MCFixupKind(Mips::fixup_MIPS_PC18_S3)));
695 #include "MipsGenMCCodeEmitter.inc"