diff options
Diffstat (limited to 'qemu/disas/libvixl/vixl/a64/instructions-a64.h')
| -rw-r--r-- | qemu/disas/libvixl/vixl/a64/instructions-a64.h | 757 |
1 files changed, 0 insertions, 757 deletions
diff --git a/qemu/disas/libvixl/vixl/a64/instructions-a64.h b/qemu/disas/libvixl/vixl/a64/instructions-a64.h deleted file mode 100644 index 7e0dbae36..000000000 --- a/qemu/disas/libvixl/vixl/a64/instructions-a64.h +++ /dev/null @@ -1,757 +0,0 @@ -// Copyright 2015, ARM Limited -// All rights reserved. -// -// Redistribution and use in source and binary forms, with or without -// modification, are permitted provided that the following conditions are met: -// -// * Redistributions of source code must retain the above copyright notice, -// this list of conditions and the following disclaimer. -// * Redistributions in binary form must reproduce the above copyright notice, -// this list of conditions and the following disclaimer in the documentation -// and/or other materials provided with the distribution. -// * Neither the name of ARM Limited nor the names of its contributors may be -// used to endorse or promote products derived from this software without -// specific prior written permission. -// -// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS CONTRIBUTORS "AS IS" AND -// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED -// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE -// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE -// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL -// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR -// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER -// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, -// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE -// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - -#ifndef VIXL_A64_INSTRUCTIONS_A64_H_ -#define VIXL_A64_INSTRUCTIONS_A64_H_ - -#include "vixl/globals.h" -#include "vixl/utils.h" -#include "vixl/a64/constants-a64.h" - -namespace vixl { -// ISA constants. -------------------------------------------------------------- - -typedef uint32_t Instr; -const unsigned kInstructionSize = 4; -const unsigned kInstructionSizeLog2 = 2; -const unsigned kLiteralEntrySize = 4; -const unsigned kLiteralEntrySizeLog2 = 2; -const unsigned kMaxLoadLiteralRange = 1 * MBytes; - -// This is the nominal page size (as used by the adrp instruction); the actual -// size of the memory pages allocated by the kernel is likely to differ. -const unsigned kPageSize = 4 * KBytes; -const unsigned kPageSizeLog2 = 12; - -const unsigned kBRegSize = 8; -const unsigned kBRegSizeLog2 = 3; -const unsigned kBRegSizeInBytes = kBRegSize / 8; -const unsigned kBRegSizeInBytesLog2 = kBRegSizeLog2 - 3; -const unsigned kHRegSize = 16; -const unsigned kHRegSizeLog2 = 4; -const unsigned kHRegSizeInBytes = kHRegSize / 8; -const unsigned kHRegSizeInBytesLog2 = kHRegSizeLog2 - 3; -const unsigned kWRegSize = 32; -const unsigned kWRegSizeLog2 = 5; -const unsigned kWRegSizeInBytes = kWRegSize / 8; -const unsigned kWRegSizeInBytesLog2 = kWRegSizeLog2 - 3; -const unsigned kXRegSize = 64; -const unsigned kXRegSizeLog2 = 6; -const unsigned kXRegSizeInBytes = kXRegSize / 8; -const unsigned kXRegSizeInBytesLog2 = kXRegSizeLog2 - 3; -const unsigned kSRegSize = 32; -const unsigned kSRegSizeLog2 = 5; -const unsigned kSRegSizeInBytes = kSRegSize / 8; -const unsigned kSRegSizeInBytesLog2 = kSRegSizeLog2 - 3; -const unsigned kDRegSize = 64; -const unsigned kDRegSizeLog2 = 6; -const unsigned kDRegSizeInBytes = kDRegSize / 8; -const unsigned kDRegSizeInBytesLog2 = kDRegSizeLog2 - 3; -const unsigned kQRegSize = 128; -const unsigned kQRegSizeLog2 = 7; -const unsigned kQRegSizeInBytes = kQRegSize / 8; -const unsigned kQRegSizeInBytesLog2 = kQRegSizeLog2 - 3; -const uint64_t kWRegMask = UINT64_C(0xffffffff); -const uint64_t kXRegMask = UINT64_C(0xffffffffffffffff); -const uint64_t kSRegMask = UINT64_C(0xffffffff); -const uint64_t kDRegMask = UINT64_C(0xffffffffffffffff); -const uint64_t kSSignMask = UINT64_C(0x80000000); -const uint64_t kDSignMask = UINT64_C(0x8000000000000000); -const uint64_t kWSignMask = UINT64_C(0x80000000); -const uint64_t kXSignMask = UINT64_C(0x8000000000000000); -const uint64_t kByteMask = UINT64_C(0xff); -const uint64_t kHalfWordMask = UINT64_C(0xffff); -const uint64_t kWordMask = UINT64_C(0xffffffff); -const uint64_t kXMaxUInt = UINT64_C(0xffffffffffffffff); -const uint64_t kWMaxUInt = UINT64_C(0xffffffff); -const int64_t kXMaxInt = INT64_C(0x7fffffffffffffff); -const int64_t kXMinInt = INT64_C(0x8000000000000000); -const int32_t kWMaxInt = INT32_C(0x7fffffff); -const int32_t kWMinInt = INT32_C(0x80000000); -const unsigned kLinkRegCode = 30; -const unsigned kZeroRegCode = 31; -const unsigned kSPRegInternalCode = 63; -const unsigned kRegCodeMask = 0x1f; - -const unsigned kAddressTagOffset = 56; -const unsigned kAddressTagWidth = 8; -const uint64_t kAddressTagMask = - ((UINT64_C(1) << kAddressTagWidth) - 1) << kAddressTagOffset; -VIXL_STATIC_ASSERT(kAddressTagMask == UINT64_C(0xff00000000000000)); - -// AArch64 floating-point specifics. These match IEEE-754. -const unsigned kDoubleMantissaBits = 52; -const unsigned kDoubleExponentBits = 11; -const unsigned kFloatMantissaBits = 23; -const unsigned kFloatExponentBits = 8; -const unsigned kFloat16MantissaBits = 10; -const unsigned kFloat16ExponentBits = 5; - -// Floating-point infinity values. -extern const float16 kFP16PositiveInfinity; -extern const float16 kFP16NegativeInfinity; -extern const float kFP32PositiveInfinity; -extern const float kFP32NegativeInfinity; -extern const double kFP64PositiveInfinity; -extern const double kFP64NegativeInfinity; - -// The default NaN values (for FPCR.DN=1). -extern const float16 kFP16DefaultNaN; -extern const float kFP32DefaultNaN; -extern const double kFP64DefaultNaN; - -unsigned CalcLSDataSize(LoadStoreOp op); -unsigned CalcLSPairDataSize(LoadStorePairOp op); - -enum ImmBranchType { - UnknownBranchType = 0, - CondBranchType = 1, - UncondBranchType = 2, - CompareBranchType = 3, - TestBranchType = 4 -}; - -enum AddrMode { - Offset, - PreIndex, - PostIndex -}; - -enum FPRounding { - // The first four values are encodable directly by FPCR<RMode>. - FPTieEven = 0x0, - FPPositiveInfinity = 0x1, - FPNegativeInfinity = 0x2, - FPZero = 0x3, - - // The final rounding modes are only available when explicitly specified by - // the instruction (such as with fcvta). It cannot be set in FPCR. - FPTieAway, - FPRoundOdd -}; - -enum Reg31Mode { - Reg31IsStackPointer, - Reg31IsZeroRegister -}; - -// Instructions. --------------------------------------------------------------- - -class Instruction { - public: - Instr InstructionBits() const { - return *(reinterpret_cast<const Instr*>(this)); - } - - void SetInstructionBits(Instr new_instr) { - *(reinterpret_cast<Instr*>(this)) = new_instr; - } - - int Bit(int pos) const { - return (InstructionBits() >> pos) & 1; - } - - uint32_t Bits(int msb, int lsb) const { - return unsigned_bitextract_32(msb, lsb, InstructionBits()); - } - - int32_t SignedBits(int msb, int lsb) const { - int32_t bits = *(reinterpret_cast<const int32_t*>(this)); - return signed_bitextract_32(msb, lsb, bits); - } - - Instr Mask(uint32_t mask) const { - return InstructionBits() & mask; - } - - #define DEFINE_GETTER(Name, HighBit, LowBit, Func) \ - int32_t Name() const { return Func(HighBit, LowBit); } - INSTRUCTION_FIELDS_LIST(DEFINE_GETTER) - #undef DEFINE_GETTER - - // ImmPCRel is a compound field (not present in INSTRUCTION_FIELDS_LIST), - // formed from ImmPCRelLo and ImmPCRelHi. - int ImmPCRel() const { - int offset = - static_cast<int>((ImmPCRelHi() << ImmPCRelLo_width) | ImmPCRelLo()); - int width = ImmPCRelLo_width + ImmPCRelHi_width; - return signed_bitextract_32(width - 1, 0, offset); - } - - uint64_t ImmLogical() const; - unsigned ImmNEONabcdefgh() const; - float ImmFP32() const; - double ImmFP64() const; - float ImmNEONFP32() const; - double ImmNEONFP64() const; - - unsigned SizeLS() const { - return CalcLSDataSize(static_cast<LoadStoreOp>(Mask(LoadStoreMask))); - } - - unsigned SizeLSPair() const { - return CalcLSPairDataSize( - static_cast<LoadStorePairOp>(Mask(LoadStorePairMask))); - } - - int NEONLSIndex(int access_size_shift) const { - int64_t q = NEONQ(); - int64_t s = NEONS(); - int64_t size = NEONLSSize(); - int64_t index = (q << 3) | (s << 2) | size; - return static_cast<int>(index >> access_size_shift); - } - - // Helpers. - bool IsCondBranchImm() const { - return Mask(ConditionalBranchFMask) == ConditionalBranchFixed; - } - - bool IsUncondBranchImm() const { - return Mask(UnconditionalBranchFMask) == UnconditionalBranchFixed; - } - - bool IsCompareBranch() const { - return Mask(CompareBranchFMask) == CompareBranchFixed; - } - - bool IsTestBranch() const { - return Mask(TestBranchFMask) == TestBranchFixed; - } - - bool IsImmBranch() const { - return BranchType() != UnknownBranchType; - } - - bool IsPCRelAddressing() const { - return Mask(PCRelAddressingFMask) == PCRelAddressingFixed; - } - - bool IsLogicalImmediate() const { - return Mask(LogicalImmediateFMask) == LogicalImmediateFixed; - } - - bool IsAddSubImmediate() const { - return Mask(AddSubImmediateFMask) == AddSubImmediateFixed; - } - - bool IsAddSubExtended() const { - return Mask(AddSubExtendedFMask) == AddSubExtendedFixed; - } - - bool IsLoadOrStore() const { - return Mask(LoadStoreAnyFMask) == LoadStoreAnyFixed; - } - - bool IsLoad() const; - bool IsStore() const; - - bool IsLoadLiteral() const { - // This includes PRFM_lit. - return Mask(LoadLiteralFMask) == LoadLiteralFixed; - } - - bool IsMovn() const { - return (Mask(MoveWideImmediateMask) == MOVN_x) || - (Mask(MoveWideImmediateMask) == MOVN_w); - } - - static int ImmBranchRangeBitwidth(ImmBranchType branch_type); - static int32_t ImmBranchForwardRange(ImmBranchType branch_type); - static bool IsValidImmPCOffset(ImmBranchType branch_type, int64_t offset); - - // Indicate whether Rd can be the stack pointer or the zero register. This - // does not check that the instruction actually has an Rd field. - Reg31Mode RdMode() const { - // The following instructions use sp or wsp as Rd: - // Add/sub (immediate) when not setting the flags. - // Add/sub (extended) when not setting the flags. - // Logical (immediate) when not setting the flags. - // Otherwise, r31 is the zero register. - if (IsAddSubImmediate() || IsAddSubExtended()) { - if (Mask(AddSubSetFlagsBit)) { - return Reg31IsZeroRegister; - } else { - return Reg31IsStackPointer; - } - } - if (IsLogicalImmediate()) { - // Of the logical (immediate) instructions, only ANDS (and its aliases) - // can set the flags. The others can all write into sp. - // Note that some logical operations are not available to - // immediate-operand instructions, so we have to combine two masks here. - if (Mask(LogicalImmediateMask & LogicalOpMask) == ANDS) { - return Reg31IsZeroRegister; - } else { - return Reg31IsStackPointer; - } - } - return Reg31IsZeroRegister; - } - - // Indicate whether Rn can be the stack pointer or the zero register. This - // does not check that the instruction actually has an Rn field. - Reg31Mode RnMode() const { - // The following instructions use sp or wsp as Rn: - // All loads and stores. - // Add/sub (immediate). - // Add/sub (extended). - // Otherwise, r31 is the zero register. - if (IsLoadOrStore() || IsAddSubImmediate() || IsAddSubExtended()) { - return Reg31IsStackPointer; - } - return Reg31IsZeroRegister; - } - - ImmBranchType BranchType() const { - if (IsCondBranchImm()) { - return CondBranchType; - } else if (IsUncondBranchImm()) { - return UncondBranchType; - } else if (IsCompareBranch()) { - return CompareBranchType; - } else if (IsTestBranch()) { - return TestBranchType; - } else { - return UnknownBranchType; - } - } - - // Find the target of this instruction. 'this' may be a branch or a - // PC-relative addressing instruction. - const Instruction* ImmPCOffsetTarget() const; - - // Patch a PC-relative offset to refer to 'target'. 'this' may be a branch or - // a PC-relative addressing instruction. - void SetImmPCOffsetTarget(const Instruction* target); - // Patch a literal load instruction to load from 'source'. - void SetImmLLiteral(const Instruction* source); - - // The range of a load literal instruction, expressed as 'instr +- range'. - // The range is actually the 'positive' range; the branch instruction can - // target [instr - range - kInstructionSize, instr + range]. - static const int kLoadLiteralImmBitwidth = 19; - static const int kLoadLiteralRange = - (1 << kLoadLiteralImmBitwidth) / 2 - kInstructionSize; - - // Calculate the address of a literal referred to by a load-literal - // instruction, and return it as the specified type. - // - // The literal itself is safely mutable only if the backing buffer is safely - // mutable. - template <typename T> - T LiteralAddress() const { - uint64_t base_raw = reinterpret_cast<uint64_t>(this); - int64_t offset = ImmLLiteral() << kLiteralEntrySizeLog2; - uint64_t address_raw = base_raw + offset; - - // Cast the address using a C-style cast. A reinterpret_cast would be - // appropriate, but it can't cast one integral type to another. - T address = (T)(address_raw); - - // Assert that the address can be represented by the specified type. - VIXL_ASSERT((uint64_t)(address) == address_raw); - - return address; - } - - uint32_t Literal32() const { - uint32_t literal; - memcpy(&literal, LiteralAddress<const void*>(), sizeof(literal)); - return literal; - } - - uint64_t Literal64() const { - uint64_t literal; - memcpy(&literal, LiteralAddress<const void*>(), sizeof(literal)); - return literal; - } - - float LiteralFP32() const { - return rawbits_to_float(Literal32()); - } - - double LiteralFP64() const { - return rawbits_to_double(Literal64()); - } - - const Instruction* NextInstruction() const { - return this + kInstructionSize; - } - - const Instruction* InstructionAtOffset(int64_t offset) const { - VIXL_ASSERT(IsWordAligned(this + offset)); - return this + offset; - } - - template<typename T> static Instruction* Cast(T src) { - return reinterpret_cast<Instruction*>(src); - } - - template<typename T> static const Instruction* CastConst(T src) { - return reinterpret_cast<const Instruction*>(src); - } - - private: - int ImmBranch() const; - - static float Imm8ToFP32(uint32_t imm8); - static double Imm8ToFP64(uint32_t imm8); - - void SetPCRelImmTarget(const Instruction* target); - void SetBranchImmTarget(const Instruction* target); -}; - - -// Functions for handling NEON vector format information. -enum VectorFormat { - kFormatUndefined = 0xffffffff, - kFormat8B = NEON_8B, - kFormat16B = NEON_16B, - kFormat4H = NEON_4H, - kFormat8H = NEON_8H, - kFormat2S = NEON_2S, - kFormat4S = NEON_4S, - kFormat1D = NEON_1D, - kFormat2D = NEON_2D, - - // Scalar formats. We add the scalar bit to distinguish between scalar and - // vector enumerations; the bit is always set in the encoding of scalar ops - // and always clear for vector ops. Although kFormatD and kFormat1D appear - // to be the same, their meaning is subtly different. The first is a scalar - // operation, the second a vector operation that only affects one lane. - kFormatB = NEON_B | NEONScalar, - kFormatH = NEON_H | NEONScalar, - kFormatS = NEON_S | NEONScalar, - kFormatD = NEON_D | NEONScalar -}; - -VectorFormat VectorFormatHalfWidth(const VectorFormat vform); -VectorFormat VectorFormatDoubleWidth(const VectorFormat vform); -VectorFormat VectorFormatDoubleLanes(const VectorFormat vform); -VectorFormat VectorFormatHalfLanes(const VectorFormat vform); -VectorFormat ScalarFormatFromLaneSize(int lanesize); -VectorFormat VectorFormatHalfWidthDoubleLanes(const VectorFormat vform); -VectorFormat VectorFormatFillQ(const VectorFormat vform); -unsigned RegisterSizeInBitsFromFormat(VectorFormat vform); -unsigned RegisterSizeInBytesFromFormat(VectorFormat vform); -// TODO: Make the return types of these functions consistent. -unsigned LaneSizeInBitsFromFormat(VectorFormat vform); -int LaneSizeInBytesFromFormat(VectorFormat vform); -int LaneSizeInBytesLog2FromFormat(VectorFormat vform); -int LaneCountFromFormat(VectorFormat vform); -int MaxLaneCountFromFormat(VectorFormat vform); -bool IsVectorFormat(VectorFormat vform); -int64_t MaxIntFromFormat(VectorFormat vform); -int64_t MinIntFromFormat(VectorFormat vform); -uint64_t MaxUintFromFormat(VectorFormat vform); - - -enum NEONFormat { - NF_UNDEF = 0, - NF_8B = 1, - NF_16B = 2, - NF_4H = 3, - NF_8H = 4, - NF_2S = 5, - NF_4S = 6, - NF_1D = 7, - NF_2D = 8, - NF_B = 9, - NF_H = 10, - NF_S = 11, - NF_D = 12 -}; - -static const unsigned kNEONFormatMaxBits = 6; - -struct NEONFormatMap { - // The bit positions in the instruction to consider. - uint8_t bits[kNEONFormatMaxBits]; - - // Mapping from concatenated bits to format. - NEONFormat map[1 << kNEONFormatMaxBits]; -}; - -class NEONFormatDecoder { - public: - enum SubstitutionMode { - kPlaceholder, - kFormat - }; - - // Construct a format decoder with increasingly specific format maps for each - // subsitution. If no format map is specified, the default is the integer - // format map. - explicit NEONFormatDecoder(const Instruction* instr) { - instrbits_ = instr->InstructionBits(); - SetFormatMaps(IntegerFormatMap()); - } - NEONFormatDecoder(const Instruction* instr, - const NEONFormatMap* format) { - instrbits_ = instr->InstructionBits(); - SetFormatMaps(format); - } - NEONFormatDecoder(const Instruction* instr, - const NEONFormatMap* format0, - const NEONFormatMap* format1) { - instrbits_ = instr->InstructionBits(); - SetFormatMaps(format0, format1); - } - NEONFormatDecoder(const Instruction* instr, - const NEONFormatMap* format0, - const NEONFormatMap* format1, - const NEONFormatMap* format2) { - instrbits_ = instr->InstructionBits(); - SetFormatMaps(format0, format1, format2); - } - - // Set the format mapping for all or individual substitutions. - void SetFormatMaps(const NEONFormatMap* format0, - const NEONFormatMap* format1 = NULL, - const NEONFormatMap* format2 = NULL) { - VIXL_ASSERT(format0 != NULL); - formats_[0] = format0; - formats_[1] = (format1 == NULL) ? formats_[0] : format1; - formats_[2] = (format2 == NULL) ? formats_[1] : format2; - } - void SetFormatMap(unsigned index, const NEONFormatMap* format) { - VIXL_ASSERT(index <= (sizeof(formats_) / sizeof(formats_[0]))); - VIXL_ASSERT(format != NULL); - formats_[index] = format; - } - - // Substitute %s in the input string with the placeholder string for each - // register, ie. "'B", "'H", etc. - const char* SubstitutePlaceholders(const char* string) { - return Substitute(string, kPlaceholder, kPlaceholder, kPlaceholder); - } - - // Substitute %s in the input string with a new string based on the - // substitution mode. - const char* Substitute(const char* string, - SubstitutionMode mode0 = kFormat, - SubstitutionMode mode1 = kFormat, - SubstitutionMode mode2 = kFormat) { - snprintf(form_buffer_, sizeof(form_buffer_), string, - GetSubstitute(0, mode0), - GetSubstitute(1, mode1), - GetSubstitute(2, mode2)); - return form_buffer_; - } - - // Append a "2" to a mnemonic string based of the state of the Q bit. - const char* Mnemonic(const char* mnemonic) { - if ((instrbits_ & NEON_Q) != 0) { - snprintf(mne_buffer_, sizeof(mne_buffer_), "%s2", mnemonic); - return mne_buffer_; - } - return mnemonic; - } - - VectorFormat GetVectorFormat(int format_index = 0) { - return GetVectorFormat(formats_[format_index]); - } - - VectorFormat GetVectorFormat(const NEONFormatMap* format_map) { - static const VectorFormat vform[] = { - kFormatUndefined, - kFormat8B, kFormat16B, kFormat4H, kFormat8H, - kFormat2S, kFormat4S, kFormat1D, kFormat2D, - kFormatB, kFormatH, kFormatS, kFormatD - }; - VIXL_ASSERT(GetNEONFormat(format_map) < (sizeof(vform) / sizeof(vform[0]))); - return vform[GetNEONFormat(format_map)]; - } - - // Built in mappings for common cases. - - // The integer format map uses three bits (Q, size<1:0>) to encode the - // "standard" set of NEON integer vector formats. - static const NEONFormatMap* IntegerFormatMap() { - static const NEONFormatMap map = { - {23, 22, 30}, - {NF_8B, NF_16B, NF_4H, NF_8H, NF_2S, NF_4S, NF_UNDEF, NF_2D} - }; - return ↦ - } - - // The long integer format map uses two bits (size<1:0>) to encode the - // long set of NEON integer vector formats. These are used in narrow, wide - // and long operations. - static const NEONFormatMap* LongIntegerFormatMap() { - static const NEONFormatMap map = { - {23, 22}, {NF_8H, NF_4S, NF_2D} - }; - return ↦ - } - - // The FP format map uses two bits (Q, size<0>) to encode the NEON FP vector - // formats: NF_2S, NF_4S, NF_2D. - static const NEONFormatMap* FPFormatMap() { - // The FP format map assumes two bits (Q, size<0>) are used to encode the - // NEON FP vector formats: NF_2S, NF_4S, NF_2D. - static const NEONFormatMap map = { - {22, 30}, {NF_2S, NF_4S, NF_UNDEF, NF_2D} - }; - return ↦ - } - - // The load/store format map uses three bits (Q, 11, 10) to encode the - // set of NEON vector formats. - static const NEONFormatMap* LoadStoreFormatMap() { - static const NEONFormatMap map = { - {11, 10, 30}, - {NF_8B, NF_16B, NF_4H, NF_8H, NF_2S, NF_4S, NF_1D, NF_2D} - }; - return ↦ - } - - // The logical format map uses one bit (Q) to encode the NEON vector format: - // NF_8B, NF_16B. - static const NEONFormatMap* LogicalFormatMap() { - static const NEONFormatMap map = { - {30}, {NF_8B, NF_16B} - }; - return ↦ - } - - // The triangular format map uses between two and five bits to encode the NEON - // vector format: - // xxx10->8B, xxx11->16B, xx100->4H, xx101->8H - // x1000->2S, x1001->4S, 10001->2D, all others undefined. - static const NEONFormatMap* TriangularFormatMap() { - static const NEONFormatMap map = { - {19, 18, 17, 16, 30}, - {NF_UNDEF, NF_UNDEF, NF_8B, NF_16B, NF_4H, NF_8H, NF_8B, NF_16B, NF_2S, - NF_4S, NF_8B, NF_16B, NF_4H, NF_8H, NF_8B, NF_16B, NF_UNDEF, NF_2D, - NF_8B, NF_16B, NF_4H, NF_8H, NF_8B, NF_16B, NF_2S, NF_4S, NF_8B, NF_16B, - NF_4H, NF_8H, NF_8B, NF_16B} - }; - return ↦ - } - - // The scalar format map uses two bits (size<1:0>) to encode the NEON scalar - // formats: NF_B, NF_H, NF_S, NF_D. - static const NEONFormatMap* ScalarFormatMap() { - static const NEONFormatMap map = { - {23, 22}, {NF_B, NF_H, NF_S, NF_D} - }; - return ↦ - } - - // The long scalar format map uses two bits (size<1:0>) to encode the longer - // NEON scalar formats: NF_H, NF_S, NF_D. - static const NEONFormatMap* LongScalarFormatMap() { - static const NEONFormatMap map = { - {23, 22}, {NF_H, NF_S, NF_D} - }; - return ↦ - } - - // The FP scalar format map assumes one bit (size<0>) is used to encode the - // NEON FP scalar formats: NF_S, NF_D. - static const NEONFormatMap* FPScalarFormatMap() { - static const NEONFormatMap map = { - {22}, {NF_S, NF_D} - }; - return ↦ - } - - // The triangular scalar format map uses between one and four bits to encode - // the NEON FP scalar formats: - // xxx1->B, xx10->H, x100->S, 1000->D, all others undefined. - static const NEONFormatMap* TriangularScalarFormatMap() { - static const NEONFormatMap map = { - {19, 18, 17, 16}, - {NF_UNDEF, NF_B, NF_H, NF_B, NF_S, NF_B, NF_H, NF_B, - NF_D, NF_B, NF_H, NF_B, NF_S, NF_B, NF_H, NF_B} - }; - return ↦ - } - - private: - // Get a pointer to a string that represents the format or placeholder for - // the specified substitution index, based on the format map and instruction. - const char* GetSubstitute(int index, SubstitutionMode mode) { - if (mode == kFormat) { - return NEONFormatAsString(GetNEONFormat(formats_[index])); - } - VIXL_ASSERT(mode == kPlaceholder); - return NEONFormatAsPlaceholder(GetNEONFormat(formats_[index])); - } - - // Get the NEONFormat enumerated value for bits obtained from the - // instruction based on the specified format mapping. - NEONFormat GetNEONFormat(const NEONFormatMap* format_map) { - return format_map->map[PickBits(format_map->bits)]; - } - - // Convert a NEONFormat into a string. - static const char* NEONFormatAsString(NEONFormat format) { - static const char* formats[] = { - "undefined", - "8b", "16b", "4h", "8h", "2s", "4s", "1d", "2d", - "b", "h", "s", "d" - }; - VIXL_ASSERT(format < (sizeof(formats) / sizeof(formats[0]))); - return formats[format]; - } - - // Convert a NEONFormat into a register placeholder string. - static const char* NEONFormatAsPlaceholder(NEONFormat format) { - VIXL_ASSERT((format == NF_B) || (format == NF_H) || - (format == NF_S) || (format == NF_D) || - (format == NF_UNDEF)); - static const char* formats[] = { - "undefined", - "undefined", "undefined", "undefined", "undefined", - "undefined", "undefined", "undefined", "undefined", - "'B", "'H", "'S", "'D" - }; - return formats[format]; - } - - // Select bits from instrbits_ defined by the bits array, concatenate them, - // and return the value. - uint8_t PickBits(const uint8_t bits[]) { - uint8_t result = 0; - for (unsigned b = 0; b < kNEONFormatMaxBits; b++) { - if (bits[b] == 0) break; - result <<= 1; - result |= ((instrbits_ & (1 << bits[b])) == 0) ? 0 : 1; - } - return result; - } - - Instr instrbits_; - const NEONFormatMap* formats_[3]; - char form_buffer_[64]; - char mne_buffer_[16]; -}; -} // namespace vixl - -#endif // VIXL_A64_INSTRUCTIONS_A64_H_ |