//=- AArch64/AArch64MCCodeEmitter.cpp - Convert AArch64 code to machine code-=// // // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. // See https://llvm.org/LICENSE.txt for license information. // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception // //===----------------------------------------------------------------------===// // // This file implements the AArch64MCCodeEmitter class. // //===----------------------------------------------------------------------===// #include "MCTargetDesc/AArch64AddressingModes.h" #include "MCTargetDesc/AArch64FixupKinds.h" #include "MCTargetDesc/AArch64MCExpr.h" #include "Utils/AArch64BaseInfo.h" #include "llvm/ADT/SmallVector.h" #include "llvm/ADT/Statistic.h" #include "llvm/MC/MCCodeEmitter.h" #include "llvm/MC/MCContext.h" #include "llvm/MC/MCFixup.h" #include "llvm/MC/MCInst.h" #include "llvm/MC/MCInstrInfo.h" #include "llvm/MC/MCRegisterInfo.h" #include "llvm/MC/MCSubtargetInfo.h" #include "llvm/Support/Casting.h" #include "llvm/Support/Endian.h" #include "llvm/Support/EndianStream.h" #include "llvm/Support/ErrorHandling.h" #include "llvm/Support/raw_ostream.h" #include #include using namespace llvm; #define DEBUG_TYPE "mccodeemitter" STATISTIC(MCNumEmitted, "Number of MC instructions emitted."); STATISTIC(MCNumFixups, "Number of MC fixups created."); namespace { class AArch64MCCodeEmitter : public MCCodeEmitter { MCContext &Ctx; const MCInstrInfo &MCII; public: AArch64MCCodeEmitter(const MCInstrInfo &mcii, MCContext &ctx) : Ctx(ctx), MCII(mcii) {} AArch64MCCodeEmitter(const AArch64MCCodeEmitter &) = delete; void operator=(const AArch64MCCodeEmitter &) = delete; ~AArch64MCCodeEmitter() override = default; // getBinaryCodeForInstr - TableGen'erated function for getting the // binary encoding for an instruction. uint64_t getBinaryCodeForInstr(const MCInst &MI, SmallVectorImpl &Fixups, const MCSubtargetInfo &STI) const; /// getMachineOpValue - Return binary encoding of operand. If the machine /// operand requires relocation, record the relocation and return zero. unsigned getMachineOpValue(const MCInst &MI, const MCOperand &MO, SmallVectorImpl &Fixups, const MCSubtargetInfo &STI) const; /// getLdStUImm12OpValue - Return encoding info for 12-bit unsigned immediate /// attached to a load, store or prfm instruction. If operand requires a /// relocation, record it and return zero in that part of the encoding. template uint32_t getLdStUImm12OpValue(const MCInst &MI, unsigned OpIdx, SmallVectorImpl &Fixups, const MCSubtargetInfo &STI) const; /// getAdrLabelOpValue - Return encoding info for 21-bit immediate ADR label /// target. uint32_t getAdrLabelOpValue(const MCInst &MI, unsigned OpIdx, SmallVectorImpl &Fixups, const MCSubtargetInfo &STI) const; /// getAddSubImmOpValue - Return encoding for the 12-bit immediate value and /// the 2-bit shift field. uint32_t getAddSubImmOpValue(const MCInst &MI, unsigned OpIdx, SmallVectorImpl &Fixups, const MCSubtargetInfo &STI) const; /// getCondBranchTargetOpValue - Return the encoded value for a conditional /// branch target. uint32_t getCondBranchTargetOpValue(const MCInst &MI, unsigned OpIdx, SmallVectorImpl &Fixups, const MCSubtargetInfo &STI) const; /// getLoadLiteralOpValue - Return the encoded value for a load-literal /// pc-relative address. uint32_t getLoadLiteralOpValue(const MCInst &MI, unsigned OpIdx, SmallVectorImpl &Fixups, const MCSubtargetInfo &STI) const; /// getMemExtendOpValue - Return the encoded value for a reg-extend load/store /// instruction: bit 0 is whether a shift is present, bit 1 is whether the /// operation is a sign extend (as opposed to a zero extend). uint32_t getMemExtendOpValue(const MCInst &MI, unsigned OpIdx, SmallVectorImpl &Fixups, const MCSubtargetInfo &STI) const; /// getTestBranchTargetOpValue - Return the encoded value for a test-bit-and- /// branch target. uint32_t getTestBranchTargetOpValue(const MCInst &MI, unsigned OpIdx, SmallVectorImpl &Fixups, const MCSubtargetInfo &STI) const; /// getBranchTargetOpValue - Return the encoded value for an unconditional /// branch target. uint32_t getBranchTargetOpValue(const MCInst &MI, unsigned OpIdx, SmallVectorImpl &Fixups, const MCSubtargetInfo &STI) const; /// getMoveWideImmOpValue - Return the encoded value for the immediate operand /// of a MOVZ or MOVK instruction. uint32_t getMoveWideImmOpValue(const MCInst &MI, unsigned OpIdx, SmallVectorImpl &Fixups, const MCSubtargetInfo &STI) const; /// getVecShifterOpValue - Return the encoded value for the vector shifter. uint32_t getVecShifterOpValue(const MCInst &MI, unsigned OpIdx, SmallVectorImpl &Fixups, const MCSubtargetInfo &STI) const; /// getMoveVecShifterOpValue - Return the encoded value for the vector move /// shifter (MSL). uint32_t getMoveVecShifterOpValue(const MCInst &MI, unsigned OpIdx, SmallVectorImpl &Fixups, const MCSubtargetInfo &STI) const; /// getFixedPointScaleOpValue - Return the encoded value for the // FP-to-fixed-point scale factor. uint32_t getFixedPointScaleOpValue(const MCInst &MI, unsigned OpIdx, SmallVectorImpl &Fixups, const MCSubtargetInfo &STI) const; uint32_t getVecShiftR64OpValue(const MCInst &MI, unsigned OpIdx, SmallVectorImpl &Fixups, const MCSubtargetInfo &STI) const; uint32_t getVecShiftR32OpValue(const MCInst &MI, unsigned OpIdx, SmallVectorImpl &Fixups, const MCSubtargetInfo &STI) const; uint32_t getVecShiftR16OpValue(const MCInst &MI, unsigned OpIdx, SmallVectorImpl &Fixups, const MCSubtargetInfo &STI) const; uint32_t getVecShiftR8OpValue(const MCInst &MI, unsigned OpIdx, SmallVectorImpl &Fixups, const MCSubtargetInfo &STI) const; uint32_t getVecShiftL64OpValue(const MCInst &MI, unsigned OpIdx, SmallVectorImpl &Fixups, const MCSubtargetInfo &STI) const; uint32_t getVecShiftL32OpValue(const MCInst &MI, unsigned OpIdx, SmallVectorImpl &Fixups, const MCSubtargetInfo &STI) const; uint32_t getVecShiftL16OpValue(const MCInst &MI, unsigned OpIdx, SmallVectorImpl &Fixups, const MCSubtargetInfo &STI) const; uint32_t getVecShiftL8OpValue(const MCInst &MI, unsigned OpIdx, SmallVectorImpl &Fixups, const MCSubtargetInfo &STI) const; uint32_t getImm8OptLsl(const MCInst &MI, unsigned OpIdx, SmallVectorImpl &Fixups, const MCSubtargetInfo &STI) const; uint32_t getSVEIncDecImm(const MCInst &MI, unsigned OpIdx, SmallVectorImpl &Fixups, const MCSubtargetInfo &STI) const; unsigned fixMOVZ(const MCInst &MI, unsigned EncodedValue, const MCSubtargetInfo &STI) const; void encodeInstruction(const MCInst &MI, raw_ostream &OS, SmallVectorImpl &Fixups, const MCSubtargetInfo &STI) const override; unsigned fixMulHigh(const MCInst &MI, unsigned EncodedValue, const MCSubtargetInfo &STI) const; template unsigned fixLoadStoreExclusive(const MCInst &MI, unsigned EncodedValue, const MCSubtargetInfo &STI) const; unsigned fixOneOperandFPComparison(const MCInst &MI, unsigned EncodedValue, const MCSubtargetInfo &STI) const; uint32_t EncodeMatrixTileListRegisterClass(const MCInst &MI, unsigned OpIdx, SmallVectorImpl &Fixups, const MCSubtargetInfo &STI) const; uint32_t encodeMatrixIndexGPR32(const MCInst &MI, unsigned OpIdx, SmallVectorImpl &Fixups, const MCSubtargetInfo &STI) const; private: FeatureBitset computeAvailableFeatures(const FeatureBitset &FB) const; void verifyInstructionPredicates(const MCInst &MI, const FeatureBitset &AvailableFeatures) const; }; } // end anonymous namespace /// getMachineOpValue - Return binary encoding of operand. If the machine /// operand requires relocation, record the relocation and return zero. unsigned AArch64MCCodeEmitter::getMachineOpValue(const MCInst &MI, const MCOperand &MO, SmallVectorImpl &Fixups, const MCSubtargetInfo &STI) const { if (MO.isReg()) return Ctx.getRegisterInfo()->getEncodingValue(MO.getReg()); assert(MO.isImm() && "did not expect relocated expression"); return static_cast(MO.getImm()); } template uint32_t AArch64MCCodeEmitter::getLdStUImm12OpValue(const MCInst &MI, unsigned OpIdx, SmallVectorImpl &Fixups, const MCSubtargetInfo &STI) const { const MCOperand &MO = MI.getOperand(OpIdx); uint32_t ImmVal = 0; if (MO.isImm()) ImmVal = static_cast(MO.getImm()); else { assert(MO.isExpr() && "unable to encode load/store imm operand"); MCFixupKind Kind = MCFixupKind(FixupKind); Fixups.push_back(MCFixup::create(0, MO.getExpr(), Kind, MI.getLoc())); ++MCNumFixups; } return ImmVal; } /// getAdrLabelOpValue - Return encoding info for 21-bit immediate ADR label /// target. uint32_t AArch64MCCodeEmitter::getAdrLabelOpValue(const MCInst &MI, unsigned OpIdx, SmallVectorImpl &Fixups, const MCSubtargetInfo &STI) const { const MCOperand &MO = MI.getOperand(OpIdx); // If the destination is an immediate, we have nothing to do. if (MO.isImm()) return MO.getImm(); assert(MO.isExpr() && "Unexpected target type!"); const MCExpr *Expr = MO.getExpr(); MCFixupKind Kind = MI.getOpcode() == AArch64::ADR ? MCFixupKind(AArch64::fixup_aarch64_pcrel_adr_imm21) : MCFixupKind(AArch64::fixup_aarch64_pcrel_adrp_imm21); Fixups.push_back(MCFixup::create(0, Expr, Kind, MI.getLoc())); MCNumFixups += 1; // All of the information is in the fixup. return 0; } /// getAddSubImmOpValue - Return encoding for the 12-bit immediate value and /// the 2-bit shift field. The shift field is stored in bits 13-14 of the /// return value. uint32_t AArch64MCCodeEmitter::getAddSubImmOpValue(const MCInst &MI, unsigned OpIdx, SmallVectorImpl &Fixups, const MCSubtargetInfo &STI) const { // Suboperands are [imm, shifter]. const MCOperand &MO = MI.getOperand(OpIdx); const MCOperand &MO1 = MI.getOperand(OpIdx + 1); assert(AArch64_AM::getShiftType(MO1.getImm()) == AArch64_AM::LSL && "unexpected shift type for add/sub immediate"); unsigned ShiftVal = AArch64_AM::getShiftValue(MO1.getImm()); assert((ShiftVal == 0 || ShiftVal == 12) && "unexpected shift value for add/sub immediate"); if (MO.isImm()) return MO.getImm() | (ShiftVal == 0 ? 0 : (1 << ShiftVal)); assert(MO.isExpr() && "Unable to encode MCOperand!"); const MCExpr *Expr = MO.getExpr(); // Encode the 12 bits of the fixup. MCFixupKind Kind = MCFixupKind(AArch64::fixup_aarch64_add_imm12); Fixups.push_back(MCFixup::create(0, Expr, Kind, MI.getLoc())); ++MCNumFixups; // Set the shift bit of the add instruction for relocation types // R_AARCH64_TLSLE_ADD_TPREL_HI12 and R_AARCH64_TLSLD_ADD_DTPREL_HI12. if (const AArch64MCExpr *A64E = dyn_cast(Expr)) { AArch64MCExpr::VariantKind RefKind = A64E->getKind(); if (RefKind == AArch64MCExpr::VK_TPREL_HI12 || RefKind == AArch64MCExpr::VK_DTPREL_HI12 || RefKind == AArch64MCExpr::VK_SECREL_HI12) ShiftVal = 12; } return ShiftVal == 0 ? 0 : (1 << ShiftVal); } /// getCondBranchTargetOpValue - Return the encoded value for a conditional /// branch target. uint32_t AArch64MCCodeEmitter::getCondBranchTargetOpValue( const MCInst &MI, unsigned OpIdx, SmallVectorImpl &Fixups, const MCSubtargetInfo &STI) const { const MCOperand &MO = MI.getOperand(OpIdx); // If the destination is an immediate, we have nothing to do. if (MO.isImm()) return MO.getImm(); assert(MO.isExpr() && "Unexpected target type!"); MCFixupKind Kind = MCFixupKind(AArch64::fixup_aarch64_pcrel_branch19); Fixups.push_back(MCFixup::create(0, MO.getExpr(), Kind, MI.getLoc())); ++MCNumFixups; // All of the information is in the fixup. return 0; } /// getLoadLiteralOpValue - Return the encoded value for a load-literal /// pc-relative address. uint32_t AArch64MCCodeEmitter::getLoadLiteralOpValue(const MCInst &MI, unsigned OpIdx, SmallVectorImpl &Fixups, const MCSubtargetInfo &STI) const { const MCOperand &MO = MI.getOperand(OpIdx); // If the destination is an immediate, we have nothing to do. if (MO.isImm()) return MO.getImm(); assert(MO.isExpr() && "Unexpected target type!"); MCFixupKind Kind = MCFixupKind(AArch64::fixup_aarch64_ldr_pcrel_imm19); Fixups.push_back(MCFixup::create(0, MO.getExpr(), Kind, MI.getLoc())); ++MCNumFixups; // All of the information is in the fixup. return 0; } uint32_t AArch64MCCodeEmitter::getMemExtendOpValue(const MCInst &MI, unsigned OpIdx, SmallVectorImpl &Fixups, const MCSubtargetInfo &STI) const { unsigned SignExtend = MI.getOperand(OpIdx).getImm(); unsigned DoShift = MI.getOperand(OpIdx + 1).getImm(); return (SignExtend << 1) | DoShift; } uint32_t AArch64MCCodeEmitter::getMoveWideImmOpValue(const MCInst &MI, unsigned OpIdx, SmallVectorImpl &Fixups, const MCSubtargetInfo &STI) const { const MCOperand &MO = MI.getOperand(OpIdx); if (MO.isImm()) return MO.getImm(); assert(MO.isExpr() && "Unexpected movz/movk immediate"); Fixups.push_back(MCFixup::create( 0, MO.getExpr(), MCFixupKind(AArch64::fixup_aarch64_movw), MI.getLoc())); ++MCNumFixups; return 0; } /// getTestBranchTargetOpValue - Return the encoded value for a test-bit-and- /// branch target. uint32_t AArch64MCCodeEmitter::getTestBranchTargetOpValue( const MCInst &MI, unsigned OpIdx, SmallVectorImpl &Fixups, const MCSubtargetInfo &STI) const { const MCOperand &MO = MI.getOperand(OpIdx); // If the destination is an immediate, we have nothing to do. if (MO.isImm()) return MO.getImm(); assert(MO.isExpr() && "Unexpected ADR target type!"); MCFixupKind Kind = MCFixupKind(AArch64::fixup_aarch64_pcrel_branch14); Fixups.push_back(MCFixup::create(0, MO.getExpr(), Kind, MI.getLoc())); ++MCNumFixups; // All of the information is in the fixup. return 0; } /// getBranchTargetOpValue - Return the encoded value for an unconditional /// branch target. uint32_t AArch64MCCodeEmitter::getBranchTargetOpValue(const MCInst &MI, unsigned OpIdx, SmallVectorImpl &Fixups, const MCSubtargetInfo &STI) const { const MCOperand &MO = MI.getOperand(OpIdx); // If the destination is an immediate, we have nothing to do. if (MO.isImm()) return MO.getImm(); assert(MO.isExpr() && "Unexpected ADR target type!"); MCFixupKind Kind = MI.getOpcode() == AArch64::BL ? MCFixupKind(AArch64::fixup_aarch64_pcrel_call26) : MCFixupKind(AArch64::fixup_aarch64_pcrel_branch26); Fixups.push_back(MCFixup::create(0, MO.getExpr(), Kind, MI.getLoc())); ++MCNumFixups; // All of the information is in the fixup. return 0; } /// getVecShifterOpValue - Return the encoded value for the vector shifter: /// /// 00 -> 0 /// 01 -> 8 /// 10 -> 16 /// 11 -> 24 uint32_t AArch64MCCodeEmitter::getVecShifterOpValue(const MCInst &MI, unsigned OpIdx, SmallVectorImpl &Fixups, const MCSubtargetInfo &STI) const { const MCOperand &MO = MI.getOperand(OpIdx); assert(MO.isImm() && "Expected an immediate value for the shift amount!"); switch (MO.getImm()) { default: break; case 0: return 0; case 8: return 1; case 16: return 2; case 24: return 3; } llvm_unreachable("Invalid value for vector shift amount!"); } /// getFixedPointScaleOpValue - Return the encoded value for the // FP-to-fixed-point scale factor. uint32_t AArch64MCCodeEmitter::getFixedPointScaleOpValue( const MCInst &MI, unsigned OpIdx, SmallVectorImpl &Fixups, const MCSubtargetInfo &STI) const { const MCOperand &MO = MI.getOperand(OpIdx); assert(MO.isImm() && "Expected an immediate value for the scale amount!"); return 64 - MO.getImm(); } uint32_t AArch64MCCodeEmitter::getVecShiftR64OpValue(const MCInst &MI, unsigned OpIdx, SmallVectorImpl &Fixups, const MCSubtargetInfo &STI) const { const MCOperand &MO = MI.getOperand(OpIdx); assert(MO.isImm() && "Expected an immediate value for the scale amount!"); return 64 - MO.getImm(); } uint32_t AArch64MCCodeEmitter::getVecShiftR32OpValue(const MCInst &MI, unsigned OpIdx, SmallVectorImpl &Fixups, const MCSubtargetInfo &STI) const { const MCOperand &MO = MI.getOperand(OpIdx); assert(MO.isImm() && "Expected an immediate value for the scale amount!"); return 32 - MO.getImm(); } uint32_t AArch64MCCodeEmitter::getVecShiftR16OpValue(const MCInst &MI, unsigned OpIdx, SmallVectorImpl &Fixups, const MCSubtargetInfo &STI) const { const MCOperand &MO = MI.getOperand(OpIdx); assert(MO.isImm() && "Expected an immediate value for the scale amount!"); return 16 - MO.getImm(); } uint32_t AArch64MCCodeEmitter::getVecShiftR8OpValue(const MCInst &MI, unsigned OpIdx, SmallVectorImpl &Fixups, const MCSubtargetInfo &STI) const { const MCOperand &MO = MI.getOperand(OpIdx); assert(MO.isImm() && "Expected an immediate value for the scale amount!"); return 8 - MO.getImm(); } uint32_t AArch64MCCodeEmitter::getVecShiftL64OpValue(const MCInst &MI, unsigned OpIdx, SmallVectorImpl &Fixups, const MCSubtargetInfo &STI) const { const MCOperand &MO = MI.getOperand(OpIdx); assert(MO.isImm() && "Expected an immediate value for the scale amount!"); return MO.getImm() - 64; } uint32_t AArch64MCCodeEmitter::getVecShiftL32OpValue(const MCInst &MI, unsigned OpIdx, SmallVectorImpl &Fixups, const MCSubtargetInfo &STI) const { const MCOperand &MO = MI.getOperand(OpIdx); assert(MO.isImm() && "Expected an immediate value for the scale amount!"); return MO.getImm() - 32; } uint32_t AArch64MCCodeEmitter::getVecShiftL16OpValue(const MCInst &MI, unsigned OpIdx, SmallVectorImpl &Fixups, const MCSubtargetInfo &STI) const { const MCOperand &MO = MI.getOperand(OpIdx); assert(MO.isImm() && "Expected an immediate value for the scale amount!"); return MO.getImm() - 16; } uint32_t AArch64MCCodeEmitter::getVecShiftL8OpValue(const MCInst &MI, unsigned OpIdx, SmallVectorImpl &Fixups, const MCSubtargetInfo &STI) const { const MCOperand &MO = MI.getOperand(OpIdx); assert(MO.isImm() && "Expected an immediate value for the scale amount!"); return MO.getImm() - 8; } uint32_t AArch64MCCodeEmitter::EncodeMatrixTileListRegisterClass( const MCInst &MI, unsigned OpIdx, SmallVectorImpl &Fixups, const MCSubtargetInfo &STI) const { unsigned RegMask = MI.getOperand(OpIdx).getImm(); assert(RegMask <= 0xFF && "Invalid register mask!"); return RegMask; } uint32_t AArch64MCCodeEmitter::encodeMatrixIndexGPR32(const MCInst &MI, unsigned OpIdx, SmallVectorImpl &Fixups, const MCSubtargetInfo &STI) const { auto RegOpnd = MI.getOperand(OpIdx).getReg(); assert(RegOpnd >= AArch64::W12 && RegOpnd <= AArch64::W15 && "Expected register in the range w12-w15!"); return RegOpnd - AArch64::W12; } uint32_t AArch64MCCodeEmitter::getImm8OptLsl(const MCInst &MI, unsigned OpIdx, SmallVectorImpl &Fixups, const MCSubtargetInfo &STI) const { // Test shift auto ShiftOpnd = MI.getOperand(OpIdx + 1).getImm(); assert(AArch64_AM::getShiftType(ShiftOpnd) == AArch64_AM::LSL && "Unexpected shift type for imm8_opt_lsl immediate."); unsigned ShiftVal = AArch64_AM::getShiftValue(ShiftOpnd); assert((ShiftVal == 0 || ShiftVal == 8) && "Unexpected shift value for imm8_opt_lsl immediate."); // Test immediate auto Immediate = MI.getOperand(OpIdx).getImm(); return (Immediate & 0xff) | (ShiftVal == 0 ? 0 : (1 << ShiftVal)); } uint32_t AArch64MCCodeEmitter::getSVEIncDecImm(const MCInst &MI, unsigned OpIdx, SmallVectorImpl &Fixups, const MCSubtargetInfo &STI) const { const MCOperand &MO = MI.getOperand(OpIdx); assert(MO.isImm() && "Expected an immediate value!"); // Normalize 1-16 range to 0-15. return MO.getImm() - 1; } /// getMoveVecShifterOpValue - Return the encoded value for the vector move /// shifter (MSL). uint32_t AArch64MCCodeEmitter::getMoveVecShifterOpValue( const MCInst &MI, unsigned OpIdx, SmallVectorImpl &Fixups, const MCSubtargetInfo &STI) const { const MCOperand &MO = MI.getOperand(OpIdx); assert(MO.isImm() && "Expected an immediate value for the move shift amount!"); unsigned ShiftVal = AArch64_AM::getShiftValue(MO.getImm()); assert((ShiftVal == 8 || ShiftVal == 16) && "Invalid shift amount!"); return ShiftVal == 8 ? 0 : 1; } unsigned AArch64MCCodeEmitter::fixMOVZ(const MCInst &MI, unsigned EncodedValue, const MCSubtargetInfo &STI) const { // If one of the signed fixup kinds is applied to a MOVZ instruction, the // eventual result could be either a MOVZ or a MOVN. It's the MCCodeEmitter's // job to ensure that any bits possibly affected by this are 0. This means we // must zero out bit 30 (essentially emitting a MOVN). MCOperand UImm16MO = MI.getOperand(1); // Nothing to do if there's no fixup. if (UImm16MO.isImm()) return EncodedValue; const MCExpr *E = UImm16MO.getExpr(); if (const AArch64MCExpr *A64E = dyn_cast(E)) { switch (A64E->getKind()) { case AArch64MCExpr::VK_DTPREL_G2: case AArch64MCExpr::VK_DTPREL_G1: case AArch64MCExpr::VK_DTPREL_G0: case AArch64MCExpr::VK_GOTTPREL_G1: case AArch64MCExpr::VK_TPREL_G2: case AArch64MCExpr::VK_TPREL_G1: case AArch64MCExpr::VK_TPREL_G0: return EncodedValue & ~(1u << 30); default: // Nothing to do for an unsigned fixup. return EncodedValue; } } return EncodedValue; } void AArch64MCCodeEmitter::encodeInstruction(const MCInst &MI, raw_ostream &OS, SmallVectorImpl &Fixups, const MCSubtargetInfo &STI) const { verifyInstructionPredicates(MI, computeAvailableFeatures(STI.getFeatureBits())); if (MI.getOpcode() == AArch64::TLSDESCCALL) { // This is a directive which applies an R_AARCH64_TLSDESC_CALL to the // following (BLR) instruction. It doesn't emit any code itself so it // doesn't go through the normal TableGenerated channels. auto Reloc = STI.getTargetTriple().getEnvironment() == Triple::GNUILP32 ? ELF::R_AARCH64_P32_TLSDESC_CALL : ELF::R_AARCH64_TLSDESC_CALL; Fixups.push_back( MCFixup::create(0, MI.getOperand(0).getExpr(), MCFixupKind(FirstLiteralRelocationKind + Reloc))); return; } if (MI.getOpcode() == AArch64::CompilerBarrier || MI.getOpcode() == AArch64::SPACE) { // CompilerBarrier just prevents the compiler from reordering accesses, and // SPACE just increases basic block size, in both cases no actual code. return; } uint64_t Binary = getBinaryCodeForInstr(MI, Fixups, STI); support::endian::write(OS, Binary, support::little); ++MCNumEmitted; // Keep track of the # of mi's emitted. } unsigned AArch64MCCodeEmitter::fixMulHigh(const MCInst &MI, unsigned EncodedValue, const MCSubtargetInfo &STI) const { // The Ra field of SMULH and UMULH is unused: it should be assembled as 31 // (i.e. all bits 1) but is ignored by the processor. EncodedValue |= 0x1f << 10; return EncodedValue; } template unsigned AArch64MCCodeEmitter::fixLoadStoreExclusive(const MCInst &MI, unsigned EncodedValue, const MCSubtargetInfo &STI) const { if (!hasRs) EncodedValue |= 0x001F0000; if (!hasRt2) EncodedValue |= 0x00007C00; return EncodedValue; } unsigned AArch64MCCodeEmitter::fixOneOperandFPComparison( const MCInst &MI, unsigned EncodedValue, const MCSubtargetInfo &STI) const { // The Rm field of FCMP and friends is unused - it should be assembled // as 0, but is ignored by the processor. EncodedValue &= ~(0x1f << 16); return EncodedValue; } #define ENABLE_INSTR_PREDICATE_VERIFIER #include "AArch64GenMCCodeEmitter.inc" MCCodeEmitter *llvm::createAArch64MCCodeEmitter(const MCInstrInfo &MCII, const MCRegisterInfo &MRI, MCContext &Ctx) { return new AArch64MCCodeEmitter(MCII, Ctx); }