1 //===-- PPCMCCodeEmitter.cpp - Convert PPC 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 PPCMCCodeEmitter class.
12 //===----------------------------------------------------------------------===//
14 #include "MCTargetDesc/PPCMCTargetDesc.h"
15 #include "MCTargetDesc/PPCFixupKinds.h"
16 #include "llvm/ADT/Statistic.h"
17 #include "llvm/MC/MCCodeEmitter.h"
18 #include "llvm/MC/MCContext.h"
19 #include "llvm/MC/MCExpr.h"
20 #include "llvm/MC/MCInst.h"
21 #include "llvm/MC/MCInstrInfo.h"
22 #include "llvm/MC/MCSubtargetInfo.h"
23 #include "llvm/Support/ErrorHandling.h"
24 #include "llvm/Support/raw_ostream.h"
25 #include "llvm/Target/TargetOpcodes.h"
28 #define DEBUG_TYPE "mccodeemitter"
30 STATISTIC(MCNumEmitted, "Number of MC instructions emitted");
33 class PPCMCCodeEmitter : public MCCodeEmitter {
34 PPCMCCodeEmitter(const PPCMCCodeEmitter &) LLVM_DELETED_FUNCTION;
35 void operator=(const PPCMCCodeEmitter &) LLVM_DELETED_FUNCTION;
37 const MCInstrInfo &MCII;
42 PPCMCCodeEmitter(const MCInstrInfo &mcii, MCContext &ctx, bool isLittle)
43 : MCII(mcii), CTX(ctx), IsLittleEndian(isLittle) {
46 ~PPCMCCodeEmitter() {}
48 unsigned getDirectBrEncoding(const MCInst &MI, unsigned OpNo,
49 SmallVectorImpl<MCFixup> &Fixups,
50 const MCSubtargetInfo &STI) const;
51 unsigned getCondBrEncoding(const MCInst &MI, unsigned OpNo,
52 SmallVectorImpl<MCFixup> &Fixups,
53 const MCSubtargetInfo &STI) const;
54 unsigned getAbsDirectBrEncoding(const MCInst &MI, unsigned OpNo,
55 SmallVectorImpl<MCFixup> &Fixups,
56 const MCSubtargetInfo &STI) const;
57 unsigned getAbsCondBrEncoding(const MCInst &MI, unsigned OpNo,
58 SmallVectorImpl<MCFixup> &Fixups,
59 const MCSubtargetInfo &STI) const;
60 unsigned getImm16Encoding(const MCInst &MI, unsigned OpNo,
61 SmallVectorImpl<MCFixup> &Fixups,
62 const MCSubtargetInfo &STI) const;
63 unsigned getMemRIEncoding(const MCInst &MI, unsigned OpNo,
64 SmallVectorImpl<MCFixup> &Fixups,
65 const MCSubtargetInfo &STI) const;
66 unsigned getMemRIXEncoding(const MCInst &MI, unsigned OpNo,
67 SmallVectorImpl<MCFixup> &Fixups,
68 const MCSubtargetInfo &STI) const;
69 unsigned getSPE8DisEncoding(const MCInst &MI, unsigned OpNo,
70 SmallVectorImpl<MCFixup> &Fixups,
71 const MCSubtargetInfo &STI) const;
72 unsigned getSPE4DisEncoding(const MCInst &MI, unsigned OpNo,
73 SmallVectorImpl<MCFixup> &Fixups,
74 const MCSubtargetInfo &STI) const;
75 unsigned getSPE2DisEncoding(const MCInst &MI, unsigned OpNo,
76 SmallVectorImpl<MCFixup> &Fixups,
77 const MCSubtargetInfo &STI) const;
78 unsigned getTLSRegEncoding(const MCInst &MI, unsigned OpNo,
79 SmallVectorImpl<MCFixup> &Fixups,
80 const MCSubtargetInfo &STI) const;
81 unsigned getTLSCallEncoding(const MCInst &MI, unsigned OpNo,
82 SmallVectorImpl<MCFixup> &Fixups,
83 const MCSubtargetInfo &STI) const;
84 unsigned get_crbitm_encoding(const MCInst &MI, unsigned OpNo,
85 SmallVectorImpl<MCFixup> &Fixups,
86 const MCSubtargetInfo &STI) const;
88 /// getMachineOpValue - Return binary encoding of operand. If the machine
89 /// operand requires relocation, record the relocation and return zero.
90 unsigned getMachineOpValue(const MCInst &MI,const MCOperand &MO,
91 SmallVectorImpl<MCFixup> &Fixups,
92 const MCSubtargetInfo &STI) const;
94 // getBinaryCodeForInstr - TableGen'erated function for getting the
95 // binary encoding for an instruction.
96 uint64_t getBinaryCodeForInstr(const MCInst &MI,
97 SmallVectorImpl<MCFixup> &Fixups,
98 const MCSubtargetInfo &STI) const;
99 void EncodeInstruction(const MCInst &MI, raw_ostream &OS,
100 SmallVectorImpl<MCFixup> &Fixups,
101 const MCSubtargetInfo &STI) const override {
102 // For fast-isel, a float COPY_TO_REGCLASS can survive this long.
103 // It's just a nop to keep the register classes happy, so don't
104 // generate anything.
105 unsigned Opcode = MI.getOpcode();
106 const MCInstrDesc &Desc = MCII.get(Opcode);
107 if (Opcode == TargetOpcode::COPY_TO_REGCLASS)
110 uint64_t Bits = getBinaryCodeForInstr(MI, Fixups, STI);
112 // Output the constant in big/little endian byte order.
113 unsigned Size = Desc.getSize();
116 if (IsLittleEndian) {
118 OS << (char)(Bits >> 8);
119 OS << (char)(Bits >> 16);
120 OS << (char)(Bits >> 24);
122 OS << (char)(Bits >> 24);
123 OS << (char)(Bits >> 16);
124 OS << (char)(Bits >> 8);
129 // If we emit a pair of instructions, the first one is
130 // always in the top 32 bits, even on little-endian.
131 if (IsLittleEndian) {
132 OS << (char)(Bits >> 32);
133 OS << (char)(Bits >> 40);
134 OS << (char)(Bits >> 48);
135 OS << (char)(Bits >> 56);
137 OS << (char)(Bits >> 8);
138 OS << (char)(Bits >> 16);
139 OS << (char)(Bits >> 24);
141 OS << (char)(Bits >> 56);
142 OS << (char)(Bits >> 48);
143 OS << (char)(Bits >> 40);
144 OS << (char)(Bits >> 32);
145 OS << (char)(Bits >> 24);
146 OS << (char)(Bits >> 16);
147 OS << (char)(Bits >> 8);
152 llvm_unreachable ("Invalid instruction size");
155 ++MCNumEmitted; // Keep track of the # of mi's emitted.
160 } // end anonymous namespace
162 MCCodeEmitter *llvm::createPPCMCCodeEmitter(const MCInstrInfo &MCII,
163 const MCRegisterInfo &MRI,
164 const MCSubtargetInfo &STI,
166 Triple TT(STI.getTargetTriple());
167 bool IsLittleEndian = TT.getArch() == Triple::ppc64le;
168 return new PPCMCCodeEmitter(MCII, Ctx, IsLittleEndian);
171 unsigned PPCMCCodeEmitter::
172 getDirectBrEncoding(const MCInst &MI, unsigned OpNo,
173 SmallVectorImpl<MCFixup> &Fixups,
174 const MCSubtargetInfo &STI) const {
175 const MCOperand &MO = MI.getOperand(OpNo);
176 if (MO.isReg() || MO.isImm()) return getMachineOpValue(MI, MO, Fixups, STI);
178 // Add a fixup for the branch target.
179 Fixups.push_back(MCFixup::Create(0, MO.getExpr(),
180 (MCFixupKind)PPC::fixup_ppc_br24));
184 unsigned PPCMCCodeEmitter::getCondBrEncoding(const MCInst &MI, unsigned OpNo,
185 SmallVectorImpl<MCFixup> &Fixups,
186 const MCSubtargetInfo &STI) const {
187 const MCOperand &MO = MI.getOperand(OpNo);
188 if (MO.isReg() || MO.isImm()) return getMachineOpValue(MI, MO, Fixups, STI);
190 // Add a fixup for the branch target.
191 Fixups.push_back(MCFixup::Create(0, MO.getExpr(),
192 (MCFixupKind)PPC::fixup_ppc_brcond14));
196 unsigned PPCMCCodeEmitter::
197 getAbsDirectBrEncoding(const MCInst &MI, unsigned OpNo,
198 SmallVectorImpl<MCFixup> &Fixups,
199 const MCSubtargetInfo &STI) const {
200 const MCOperand &MO = MI.getOperand(OpNo);
201 if (MO.isReg() || MO.isImm()) return getMachineOpValue(MI, MO, Fixups, STI);
203 // Add a fixup for the branch target.
204 Fixups.push_back(MCFixup::Create(0, MO.getExpr(),
205 (MCFixupKind)PPC::fixup_ppc_br24abs));
209 unsigned PPCMCCodeEmitter::
210 getAbsCondBrEncoding(const MCInst &MI, unsigned OpNo,
211 SmallVectorImpl<MCFixup> &Fixups,
212 const MCSubtargetInfo &STI) const {
213 const MCOperand &MO = MI.getOperand(OpNo);
214 if (MO.isReg() || MO.isImm()) return getMachineOpValue(MI, MO, Fixups, STI);
216 // Add a fixup for the branch target.
217 Fixups.push_back(MCFixup::Create(0, MO.getExpr(),
218 (MCFixupKind)PPC::fixup_ppc_brcond14abs));
222 unsigned PPCMCCodeEmitter::getImm16Encoding(const MCInst &MI, unsigned OpNo,
223 SmallVectorImpl<MCFixup> &Fixups,
224 const MCSubtargetInfo &STI) const {
225 const MCOperand &MO = MI.getOperand(OpNo);
226 if (MO.isReg() || MO.isImm()) return getMachineOpValue(MI, MO, Fixups, STI);
228 // Add a fixup for the immediate field.
229 Fixups.push_back(MCFixup::Create(IsLittleEndian? 0 : 2, MO.getExpr(),
230 (MCFixupKind)PPC::fixup_ppc_half16));
234 unsigned PPCMCCodeEmitter::getMemRIEncoding(const MCInst &MI, unsigned OpNo,
235 SmallVectorImpl<MCFixup> &Fixups,
236 const MCSubtargetInfo &STI) const {
237 // Encode (imm, reg) as a memri, which has the low 16-bits as the
238 // displacement and the next 5 bits as the register #.
239 assert(MI.getOperand(OpNo+1).isReg());
240 unsigned RegBits = getMachineOpValue(MI, MI.getOperand(OpNo+1), Fixups, STI) << 16;
242 const MCOperand &MO = MI.getOperand(OpNo);
244 return (getMachineOpValue(MI, MO, Fixups, STI) & 0xFFFF) | RegBits;
246 // Add a fixup for the displacement field.
247 Fixups.push_back(MCFixup::Create(IsLittleEndian? 0 : 2, MO.getExpr(),
248 (MCFixupKind)PPC::fixup_ppc_half16));
253 unsigned PPCMCCodeEmitter::getMemRIXEncoding(const MCInst &MI, unsigned OpNo,
254 SmallVectorImpl<MCFixup> &Fixups,
255 const MCSubtargetInfo &STI) const {
256 // Encode (imm, reg) as a memrix, which has the low 14-bits as the
257 // displacement and the next 5 bits as the register #.
258 assert(MI.getOperand(OpNo+1).isReg());
259 unsigned RegBits = getMachineOpValue(MI, MI.getOperand(OpNo+1), Fixups, STI) << 14;
261 const MCOperand &MO = MI.getOperand(OpNo);
263 return ((getMachineOpValue(MI, MO, Fixups, STI) >> 2) & 0x3FFF) | RegBits;
265 // Add a fixup for the displacement field.
266 Fixups.push_back(MCFixup::Create(IsLittleEndian? 0 : 2, MO.getExpr(),
267 (MCFixupKind)PPC::fixup_ppc_half16ds));
272 unsigned PPCMCCodeEmitter::getSPE8DisEncoding(const MCInst &MI, unsigned OpNo,
273 SmallVectorImpl<MCFixup> &Fixups,
274 const MCSubtargetInfo &STI)
276 // Encode (imm, reg) as a spe8dis, which has the low 5-bits of (imm / 8)
277 // as the displacement and the next 5 bits as the register #.
278 assert(MI.getOperand(OpNo+1).isReg());
279 uint32_t RegBits = getMachineOpValue(MI, MI.getOperand(OpNo+1), Fixups, STI) << 5;
281 const MCOperand &MO = MI.getOperand(OpNo);
283 uint32_t Imm = getMachineOpValue(MI, MO, Fixups, STI) >> 3;
284 return reverseBits(Imm | RegBits) >> 22;
288 unsigned PPCMCCodeEmitter::getSPE4DisEncoding(const MCInst &MI, unsigned OpNo,
289 SmallVectorImpl<MCFixup> &Fixups,
290 const MCSubtargetInfo &STI)
292 // Encode (imm, reg) as a spe4dis, which has the low 5-bits of (imm / 4)
293 // as the displacement and the next 5 bits as the register #.
294 assert(MI.getOperand(OpNo+1).isReg());
295 uint32_t RegBits = getMachineOpValue(MI, MI.getOperand(OpNo+1), Fixups, STI) << 5;
297 const MCOperand &MO = MI.getOperand(OpNo);
299 uint32_t Imm = getMachineOpValue(MI, MO, Fixups, STI) >> 2;
300 return reverseBits(Imm | RegBits) >> 22;
304 unsigned PPCMCCodeEmitter::getSPE2DisEncoding(const MCInst &MI, unsigned OpNo,
305 SmallVectorImpl<MCFixup> &Fixups,
306 const MCSubtargetInfo &STI)
308 // Encode (imm, reg) as a spe2dis, which has the low 5-bits of (imm / 2)
309 // as the displacement and the next 5 bits as the register #.
310 assert(MI.getOperand(OpNo+1).isReg());
311 uint32_t RegBits = getMachineOpValue(MI, MI.getOperand(OpNo+1), Fixups, STI) << 5;
313 const MCOperand &MO = MI.getOperand(OpNo);
315 uint32_t Imm = getMachineOpValue(MI, MO, Fixups, STI) >> 1;
316 return reverseBits(Imm | RegBits) >> 22;
320 unsigned PPCMCCodeEmitter::getTLSRegEncoding(const MCInst &MI, unsigned OpNo,
321 SmallVectorImpl<MCFixup> &Fixups,
322 const MCSubtargetInfo &STI) const {
323 const MCOperand &MO = MI.getOperand(OpNo);
324 if (MO.isReg()) return getMachineOpValue(MI, MO, Fixups, STI);
326 // Add a fixup for the TLS register, which simply provides a relocation
327 // hint to the linker that this statement is part of a relocation sequence.
328 // Return the thread-pointer register's encoding.
329 Fixups.push_back(MCFixup::Create(0, MO.getExpr(),
330 (MCFixupKind)PPC::fixup_ppc_nofixup));
331 Triple TT(STI.getTargetTriple());
332 bool isPPC64 = TT.getArch() == Triple::ppc64 || TT.getArch() == Triple::ppc64le;
333 return CTX.getRegisterInfo()->getEncodingValue(isPPC64 ? PPC::X13 : PPC::R2);
336 unsigned PPCMCCodeEmitter::getTLSCallEncoding(const MCInst &MI, unsigned OpNo,
337 SmallVectorImpl<MCFixup> &Fixups,
338 const MCSubtargetInfo &STI) const {
339 // For special TLS calls, we need two fixups; one for the branch target
340 // (__tls_get_addr), which we create via getDirectBrEncoding as usual,
341 // and one for the TLSGD or TLSLD symbol, which is emitted here.
342 const MCOperand &MO = MI.getOperand(OpNo+1);
343 Fixups.push_back(MCFixup::Create(0, MO.getExpr(),
344 (MCFixupKind)PPC::fixup_ppc_nofixup));
345 return getDirectBrEncoding(MI, OpNo, Fixups, STI);
348 unsigned PPCMCCodeEmitter::
349 get_crbitm_encoding(const MCInst &MI, unsigned OpNo,
350 SmallVectorImpl<MCFixup> &Fixups,
351 const MCSubtargetInfo &STI) const {
352 const MCOperand &MO = MI.getOperand(OpNo);
353 assert((MI.getOpcode() == PPC::MTOCRF || MI.getOpcode() == PPC::MTOCRF8 ||
354 MI.getOpcode() == PPC::MFOCRF || MI.getOpcode() == PPC::MFOCRF8) &&
355 (MO.getReg() >= PPC::CR0 && MO.getReg() <= PPC::CR7));
356 return 0x80 >> CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
360 unsigned PPCMCCodeEmitter::
361 getMachineOpValue(const MCInst &MI, const MCOperand &MO,
362 SmallVectorImpl<MCFixup> &Fixups,
363 const MCSubtargetInfo &STI) const {
365 // MTOCRF/MFOCRF should go through get_crbitm_encoding for the CR operand.
366 // The GPR operand should come through here though.
367 assert((MI.getOpcode() != PPC::MTOCRF && MI.getOpcode() != PPC::MTOCRF8 &&
368 MI.getOpcode() != PPC::MFOCRF && MI.getOpcode() != PPC::MFOCRF8) ||
369 MO.getReg() < PPC::CR0 || MO.getReg() > PPC::CR7);
370 return CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
374 "Relocation required in an instruction that we cannot encode!");
379 #include "PPCGenMCCodeEmitter.inc"