| //=- 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 <cassert> |
| #include <cstdint> |
| |
| 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<MCFixup> &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<MCFixup> &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 FixupKind> |
| uint32_t getLdStUImm12OpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &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<MCFixup> &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<MCFixup> &Fixups, |
| const MCSubtargetInfo &STI) const; |
| |
| /// getCondBranchTargetOpValue - Return the encoded value for a conditional |
| /// branch target. |
| uint32_t getCondBranchTargetOpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &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<MCFixup> &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<MCFixup> &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<MCFixup> &Fixups, |
| const MCSubtargetInfo &STI) const; |
| |
| /// getBranchTargetOpValue - Return the encoded value for an unconditional |
| /// branch target. |
| uint32_t getBranchTargetOpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &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<MCFixup> &Fixups, |
| const MCSubtargetInfo &STI) const; |
| |
| /// getVecShifterOpValue - Return the encoded value for the vector shifter. |
| uint32_t getVecShifterOpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &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<MCFixup> &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<MCFixup> &Fixups, |
| const MCSubtargetInfo &STI) const; |
| |
| uint32_t getVecShiftR64OpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups, |
| const MCSubtargetInfo &STI) const; |
| uint32_t getVecShiftR32OpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups, |
| const MCSubtargetInfo &STI) const; |
| uint32_t getVecShiftR16OpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups, |
| const MCSubtargetInfo &STI) const; |
| uint32_t getVecShiftR8OpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups, |
| const MCSubtargetInfo &STI) const; |
| uint32_t getVecShiftL64OpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups, |
| const MCSubtargetInfo &STI) const; |
| uint32_t getVecShiftL32OpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups, |
| const MCSubtargetInfo &STI) const; |
| uint32_t getVecShiftL16OpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups, |
| const MCSubtargetInfo &STI) const; |
| uint32_t getVecShiftL8OpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups, |
| const MCSubtargetInfo &STI) const; |
| |
| uint32_t getImm8OptLsl(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups, |
| const MCSubtargetInfo &STI) const; |
| uint32_t getSVEIncDecImm(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &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<MCFixup> &Fixups, |
| const MCSubtargetInfo &STI) const override; |
| |
| unsigned fixMulHigh(const MCInst &MI, unsigned EncodedValue, |
| const MCSubtargetInfo &STI) const; |
| |
| template<int hasRs, int hasRt2> unsigned |
| fixLoadStoreExclusive(const MCInst &MI, unsigned EncodedValue, |
| const MCSubtargetInfo &STI) const; |
| |
| unsigned fixOneOperandFPComparison(const MCInst &MI, unsigned EncodedValue, |
| 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<MCFixup> &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<unsigned>(MO.getImm()); |
| } |
| |
| template<unsigned FixupKind> uint32_t |
| AArch64MCCodeEmitter::getLdStUImm12OpValue(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &Fixups, |
| const MCSubtargetInfo &STI) const { |
| const MCOperand &MO = MI.getOperand(OpIdx); |
| uint32_t ImmVal = 0; |
| |
| if (MO.isImm()) |
| ImmVal = static_cast<uint32_t>(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<MCFixup> &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<MCFixup> &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<AArch64MCExpr>(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<MCFixup> &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<MCFixup> &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<MCFixup> &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<MCFixup> &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<MCFixup> &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<MCFixup> &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<MCFixup> &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<MCFixup> &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<MCFixup> &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<MCFixup> &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<MCFixup> &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<MCFixup> &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<MCFixup> &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<MCFixup> &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<MCFixup> &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<MCFixup> &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::getImm8OptLsl(const MCInst &MI, unsigned OpIdx, |
| SmallVectorImpl<MCFixup> &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<MCFixup> &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<MCFixup> &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 AArch64MCExpr *A64E = cast<AArch64MCExpr>(UImm16MO.getExpr()); |
| 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 & ~(1u << 30); |
| } |
| |
| void AArch64MCCodeEmitter::encodeInstruction(const MCInst &MI, raw_ostream &OS, |
| SmallVectorImpl<MCFixup> &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. |
| MCFixupKind Fixup = MCFixupKind(AArch64::fixup_aarch64_tlsdesc_call); |
| Fixups.push_back(MCFixup::create(0, MI.getOperand(0).getExpr(), Fixup)); |
| 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<uint32_t>(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<int hasRs, int hasRt2> 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); |
| } |
