| //===- X86RegisterInfo.td - Describe the X86 Register File --*- tablegen -*-==// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file describes the X86 Register file, defining the registers themselves, |
| // aliases between the registers, and the register classes built out of the |
| // registers. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| class X86Reg<string n, bits<16> Enc, list<Register> subregs = []> : Register<n> { |
| let Namespace = "X86"; |
| let HWEncoding = Enc; |
| let SubRegs = subregs; |
| } |
| |
| // Subregister indices. |
| let Namespace = "X86" in { |
| def sub_8bit : SubRegIndex<8>; |
| def sub_8bit_hi : SubRegIndex<8, 8>; |
| def sub_8bit_hi_phony : SubRegIndex<8, 8>; |
| def sub_16bit : SubRegIndex<16>; |
| def sub_16bit_hi : SubRegIndex<16, 16>; |
| def sub_32bit : SubRegIndex<32>; |
| def sub_xmm : SubRegIndex<128>; |
| def sub_ymm : SubRegIndex<256>; |
| } |
| |
| //===----------------------------------------------------------------------===// |
| // Register definitions... |
| // |
| |
| // In the register alias definitions below, we define which registers alias |
| // which others. We only specify which registers the small registers alias, |
| // because the register file generator is smart enough to figure out that |
| // AL aliases AX if we tell it that AX aliased AL (for example). |
| |
| // Dwarf numbering is different for 32-bit and 64-bit, and there are |
| // variations by target as well. Currently the first entry is for X86-64, |
| // second - for EH on X86-32/Darwin and third is 'generic' one (X86-32/Linux |
| // and debug information on X86-32/Darwin) |
| |
| // 8-bit registers |
| // Low registers |
| def AL : X86Reg<"al", 0>; |
| def DL : X86Reg<"dl", 2>; |
| def CL : X86Reg<"cl", 1>; |
| def BL : X86Reg<"bl", 3>; |
| |
| // High registers. On x86-64, these cannot be used in any instruction |
| // with a REX prefix. |
| def AH : X86Reg<"ah", 4>; |
| def DH : X86Reg<"dh", 6>; |
| def CH : X86Reg<"ch", 5>; |
| def BH : X86Reg<"bh", 7>; |
| |
| // X86-64 only, requires REX. |
| let CostPerUse = 1 in { |
| def SIL : X86Reg<"sil", 6>; |
| def DIL : X86Reg<"dil", 7>; |
| def BPL : X86Reg<"bpl", 5>; |
| def SPL : X86Reg<"spl", 4>; |
| def R8B : X86Reg<"r8b", 8>; |
| def R9B : X86Reg<"r9b", 9>; |
| def R10B : X86Reg<"r10b", 10>; |
| def R11B : X86Reg<"r11b", 11>; |
| def R12B : X86Reg<"r12b", 12>; |
| def R13B : X86Reg<"r13b", 13>; |
| def R14B : X86Reg<"r14b", 14>; |
| def R15B : X86Reg<"r15b", 15>; |
| } |
| |
| let isArtificial = 1 in { |
| // High byte of the low 16 bits of the super-register: |
| def SIH : X86Reg<"", -1>; |
| def DIH : X86Reg<"", -1>; |
| def BPH : X86Reg<"", -1>; |
| def SPH : X86Reg<"", -1>; |
| def R8BH : X86Reg<"", -1>; |
| def R9BH : X86Reg<"", -1>; |
| def R10BH : X86Reg<"", -1>; |
| def R11BH : X86Reg<"", -1>; |
| def R12BH : X86Reg<"", -1>; |
| def R13BH : X86Reg<"", -1>; |
| def R14BH : X86Reg<"", -1>; |
| def R15BH : X86Reg<"", -1>; |
| // High word of the low 32 bits of the super-register: |
| def HAX : X86Reg<"", -1>; |
| def HDX : X86Reg<"", -1>; |
| def HCX : X86Reg<"", -1>; |
| def HBX : X86Reg<"", -1>; |
| def HSI : X86Reg<"", -1>; |
| def HDI : X86Reg<"", -1>; |
| def HBP : X86Reg<"", -1>; |
| def HSP : X86Reg<"", -1>; |
| def HIP : X86Reg<"", -1>; |
| def R8WH : X86Reg<"", -1>; |
| def R9WH : X86Reg<"", -1>; |
| def R10WH : X86Reg<"", -1>; |
| def R11WH : X86Reg<"", -1>; |
| def R12WH : X86Reg<"", -1>; |
| def R13WH : X86Reg<"", -1>; |
| def R14WH : X86Reg<"", -1>; |
| def R15WH : X86Reg<"", -1>; |
| } |
| |
| // 16-bit registers |
| let SubRegIndices = [sub_8bit, sub_8bit_hi], CoveredBySubRegs = 1 in { |
| def AX : X86Reg<"ax", 0, [AL,AH]>; |
| def DX : X86Reg<"dx", 2, [DL,DH]>; |
| def CX : X86Reg<"cx", 1, [CL,CH]>; |
| def BX : X86Reg<"bx", 3, [BL,BH]>; |
| } |
| let SubRegIndices = [sub_8bit, sub_8bit_hi_phony], CoveredBySubRegs = 1 in { |
| def SI : X86Reg<"si", 6, [SIL,SIH]>; |
| def DI : X86Reg<"di", 7, [DIL,DIH]>; |
| def BP : X86Reg<"bp", 5, [BPL,BPH]>; |
| def SP : X86Reg<"sp", 4, [SPL,SPH]>; |
| } |
| def IP : X86Reg<"ip", 0>; |
| |
| // X86-64 only, requires REX. |
| let SubRegIndices = [sub_8bit, sub_8bit_hi_phony], CostPerUse = 1, |
| CoveredBySubRegs = 1 in { |
| def R8W : X86Reg<"r8w", 8, [R8B,R8BH]>; |
| def R9W : X86Reg<"r9w", 9, [R9B,R9BH]>; |
| def R10W : X86Reg<"r10w", 10, [R10B,R10BH]>; |
| def R11W : X86Reg<"r11w", 11, [R11B,R11BH]>; |
| def R12W : X86Reg<"r12w", 12, [R12B,R12BH]>; |
| def R13W : X86Reg<"r13w", 13, [R13B,R13BH]>; |
| def R14W : X86Reg<"r14w", 14, [R14B,R14BH]>; |
| def R15W : X86Reg<"r15w", 15, [R15B,R15BH]>; |
| } |
| |
| // 32-bit registers |
| let SubRegIndices = [sub_16bit, sub_16bit_hi], CoveredBySubRegs = 1 in { |
| def EAX : X86Reg<"eax", 0, [AX, HAX]>, DwarfRegNum<[-2, 0, 0]>; |
| def EDX : X86Reg<"edx", 2, [DX, HDX]>, DwarfRegNum<[-2, 2, 2]>; |
| def ECX : X86Reg<"ecx", 1, [CX, HCX]>, DwarfRegNum<[-2, 1, 1]>; |
| def EBX : X86Reg<"ebx", 3, [BX, HBX]>, DwarfRegNum<[-2, 3, 3]>; |
| def ESI : X86Reg<"esi", 6, [SI, HSI]>, DwarfRegNum<[-2, 6, 6]>; |
| def EDI : X86Reg<"edi", 7, [DI, HDI]>, DwarfRegNum<[-2, 7, 7]>; |
| def EBP : X86Reg<"ebp", 5, [BP, HBP]>, DwarfRegNum<[-2, 4, 5]>; |
| def ESP : X86Reg<"esp", 4, [SP, HSP]>, DwarfRegNum<[-2, 5, 4]>; |
| def EIP : X86Reg<"eip", 0, [IP, HIP]>, DwarfRegNum<[-2, 8, 8]>; |
| } |
| |
| // X86-64 only, requires REX |
| let SubRegIndices = [sub_16bit, sub_16bit_hi], CostPerUse = 1, |
| CoveredBySubRegs = 1 in { |
| def R8D : X86Reg<"r8d", 8, [R8W,R8WH]>; |
| def R9D : X86Reg<"r9d", 9, [R9W,R9WH]>; |
| def R10D : X86Reg<"r10d", 10, [R10W,R10WH]>; |
| def R11D : X86Reg<"r11d", 11, [R11W,R11WH]>; |
| def R12D : X86Reg<"r12d", 12, [R12W,R12WH]>; |
| def R13D : X86Reg<"r13d", 13, [R13W,R13WH]>; |
| def R14D : X86Reg<"r14d", 14, [R14W,R14WH]>; |
| def R15D : X86Reg<"r15d", 15, [R15W,R15WH]>; |
| } |
| |
| // 64-bit registers, X86-64 only |
| let SubRegIndices = [sub_32bit] in { |
| def RAX : X86Reg<"rax", 0, [EAX]>, DwarfRegNum<[0, -2, -2]>; |
| def RDX : X86Reg<"rdx", 2, [EDX]>, DwarfRegNum<[1, -2, -2]>; |
| def RCX : X86Reg<"rcx", 1, [ECX]>, DwarfRegNum<[2, -2, -2]>; |
| def RBX : X86Reg<"rbx", 3, [EBX]>, DwarfRegNum<[3, -2, -2]>; |
| def RSI : X86Reg<"rsi", 6, [ESI]>, DwarfRegNum<[4, -2, -2]>; |
| def RDI : X86Reg<"rdi", 7, [EDI]>, DwarfRegNum<[5, -2, -2]>; |
| def RBP : X86Reg<"rbp", 5, [EBP]>, DwarfRegNum<[6, -2, -2]>; |
| def RSP : X86Reg<"rsp", 4, [ESP]>, DwarfRegNum<[7, -2, -2]>; |
| |
| // These also require REX. |
| let CostPerUse = 1 in { |
| def R8 : X86Reg<"r8", 8, [R8D]>, DwarfRegNum<[ 8, -2, -2]>; |
| def R9 : X86Reg<"r9", 9, [R9D]>, DwarfRegNum<[ 9, -2, -2]>; |
| def R10 : X86Reg<"r10", 10, [R10D]>, DwarfRegNum<[10, -2, -2]>; |
| def R11 : X86Reg<"r11", 11, [R11D]>, DwarfRegNum<[11, -2, -2]>; |
| def R12 : X86Reg<"r12", 12, [R12D]>, DwarfRegNum<[12, -2, -2]>; |
| def R13 : X86Reg<"r13", 13, [R13D]>, DwarfRegNum<[13, -2, -2]>; |
| def R14 : X86Reg<"r14", 14, [R14D]>, DwarfRegNum<[14, -2, -2]>; |
| def R15 : X86Reg<"r15", 15, [R15D]>, DwarfRegNum<[15, -2, -2]>; |
| def RIP : X86Reg<"rip", 0, [EIP]>, DwarfRegNum<[16, -2, -2]>; |
| }} |
| |
| // MMX Registers. These are actually aliased to ST0 .. ST7 |
| def MM0 : X86Reg<"mm0", 0>, DwarfRegNum<[41, 29, 29]>; |
| def MM1 : X86Reg<"mm1", 1>, DwarfRegNum<[42, 30, 30]>; |
| def MM2 : X86Reg<"mm2", 2>, DwarfRegNum<[43, 31, 31]>; |
| def MM3 : X86Reg<"mm3", 3>, DwarfRegNum<[44, 32, 32]>; |
| def MM4 : X86Reg<"mm4", 4>, DwarfRegNum<[45, 33, 33]>; |
| def MM5 : X86Reg<"mm5", 5>, DwarfRegNum<[46, 34, 34]>; |
| def MM6 : X86Reg<"mm6", 6>, DwarfRegNum<[47, 35, 35]>; |
| def MM7 : X86Reg<"mm7", 7>, DwarfRegNum<[48, 36, 36]>; |
| |
| // Pseudo Floating Point registers |
| def FP0 : X86Reg<"fp0", 0>; |
| def FP1 : X86Reg<"fp1", 0>; |
| def FP2 : X86Reg<"fp2", 0>; |
| def FP3 : X86Reg<"fp3", 0>; |
| def FP4 : X86Reg<"fp4", 0>; |
| def FP5 : X86Reg<"fp5", 0>; |
| def FP6 : X86Reg<"fp6", 0>; |
| def FP7 : X86Reg<"fp7", 0>; |
| |
| // XMM Registers, used by the various SSE instruction set extensions. |
| def XMM0: X86Reg<"xmm0", 0>, DwarfRegNum<[17, 21, 21]>; |
| def XMM1: X86Reg<"xmm1", 1>, DwarfRegNum<[18, 22, 22]>; |
| def XMM2: X86Reg<"xmm2", 2>, DwarfRegNum<[19, 23, 23]>; |
| def XMM3: X86Reg<"xmm3", 3>, DwarfRegNum<[20, 24, 24]>; |
| def XMM4: X86Reg<"xmm4", 4>, DwarfRegNum<[21, 25, 25]>; |
| def XMM5: X86Reg<"xmm5", 5>, DwarfRegNum<[22, 26, 26]>; |
| def XMM6: X86Reg<"xmm6", 6>, DwarfRegNum<[23, 27, 27]>; |
| def XMM7: X86Reg<"xmm7", 7>, DwarfRegNum<[24, 28, 28]>; |
| |
| // X86-64 only |
| let CostPerUse = 1 in { |
| def XMM8: X86Reg<"xmm8", 8>, DwarfRegNum<[25, -2, -2]>; |
| def XMM9: X86Reg<"xmm9", 9>, DwarfRegNum<[26, -2, -2]>; |
| def XMM10: X86Reg<"xmm10", 10>, DwarfRegNum<[27, -2, -2]>; |
| def XMM11: X86Reg<"xmm11", 11>, DwarfRegNum<[28, -2, -2]>; |
| def XMM12: X86Reg<"xmm12", 12>, DwarfRegNum<[29, -2, -2]>; |
| def XMM13: X86Reg<"xmm13", 13>, DwarfRegNum<[30, -2, -2]>; |
| def XMM14: X86Reg<"xmm14", 14>, DwarfRegNum<[31, -2, -2]>; |
| def XMM15: X86Reg<"xmm15", 15>, DwarfRegNum<[32, -2, -2]>; |
| |
| def XMM16: X86Reg<"xmm16", 16>, DwarfRegNum<[67, -2, -2]>; |
| def XMM17: X86Reg<"xmm17", 17>, DwarfRegNum<[68, -2, -2]>; |
| def XMM18: X86Reg<"xmm18", 18>, DwarfRegNum<[69, -2, -2]>; |
| def XMM19: X86Reg<"xmm19", 19>, DwarfRegNum<[70, -2, -2]>; |
| def XMM20: X86Reg<"xmm20", 20>, DwarfRegNum<[71, -2, -2]>; |
| def XMM21: X86Reg<"xmm21", 21>, DwarfRegNum<[72, -2, -2]>; |
| def XMM22: X86Reg<"xmm22", 22>, DwarfRegNum<[73, -2, -2]>; |
| def XMM23: X86Reg<"xmm23", 23>, DwarfRegNum<[74, -2, -2]>; |
| def XMM24: X86Reg<"xmm24", 24>, DwarfRegNum<[75, -2, -2]>; |
| def XMM25: X86Reg<"xmm25", 25>, DwarfRegNum<[76, -2, -2]>; |
| def XMM26: X86Reg<"xmm26", 26>, DwarfRegNum<[77, -2, -2]>; |
| def XMM27: X86Reg<"xmm27", 27>, DwarfRegNum<[78, -2, -2]>; |
| def XMM28: X86Reg<"xmm28", 28>, DwarfRegNum<[79, -2, -2]>; |
| def XMM29: X86Reg<"xmm29", 29>, DwarfRegNum<[80, -2, -2]>; |
| def XMM30: X86Reg<"xmm30", 30>, DwarfRegNum<[81, -2, -2]>; |
| def XMM31: X86Reg<"xmm31", 31>, DwarfRegNum<[82, -2, -2]>; |
| |
| } // CostPerUse |
| |
| // YMM0-15 registers, used by AVX instructions and |
| // YMM16-31 registers, used by AVX-512 instructions. |
| let SubRegIndices = [sub_xmm] in { |
| foreach Index = 0-31 in { |
| def YMM#Index : X86Reg<"ymm"#Index, Index, [!cast<X86Reg>("XMM"#Index)]>, |
| DwarfRegAlias<!cast<X86Reg>("XMM"#Index)>; |
| } |
| } |
| |
| // ZMM Registers, used by AVX-512 instructions. |
| let SubRegIndices = [sub_ymm] in { |
| foreach Index = 0-31 in { |
| def ZMM#Index : X86Reg<"zmm"#Index, Index, [!cast<X86Reg>("YMM"#Index)]>, |
| DwarfRegAlias<!cast<X86Reg>("XMM"#Index)>; |
| } |
| } |
| |
| // Mask Registers, used by AVX-512 instructions. |
| def K0 : X86Reg<"k0", 0>, DwarfRegNum<[118, 93, 93]>; |
| def K1 : X86Reg<"k1", 1>, DwarfRegNum<[119, 94, 94]>; |
| def K2 : X86Reg<"k2", 2>, DwarfRegNum<[120, 95, 95]>; |
| def K3 : X86Reg<"k3", 3>, DwarfRegNum<[121, 96, 96]>; |
| def K4 : X86Reg<"k4", 4>, DwarfRegNum<[122, 97, 97]>; |
| def K5 : X86Reg<"k5", 5>, DwarfRegNum<[123, 98, 98]>; |
| def K6 : X86Reg<"k6", 6>, DwarfRegNum<[124, 99, 99]>; |
| def K7 : X86Reg<"k7", 7>, DwarfRegNum<[125, 100, 100]>; |
| |
| // Floating point stack registers. These don't map one-to-one to the FP |
| // pseudo registers, but we still mark them as aliasing FP registers. That |
| // way both kinds can be live without exceeding the stack depth. ST registers |
| // are only live around inline assembly. |
| def ST0 : X86Reg<"st(0)", 0>, DwarfRegNum<[33, 12, 11]>; |
| def ST1 : X86Reg<"st(1)", 1>, DwarfRegNum<[34, 13, 12]>; |
| def ST2 : X86Reg<"st(2)", 2>, DwarfRegNum<[35, 14, 13]>; |
| def ST3 : X86Reg<"st(3)", 3>, DwarfRegNum<[36, 15, 14]>; |
| def ST4 : X86Reg<"st(4)", 4>, DwarfRegNum<[37, 16, 15]>; |
| def ST5 : X86Reg<"st(5)", 5>, DwarfRegNum<[38, 17, 16]>; |
| def ST6 : X86Reg<"st(6)", 6>, DwarfRegNum<[39, 18, 17]>; |
| def ST7 : X86Reg<"st(7)", 7>, DwarfRegNum<[40, 19, 18]>; |
| |
| // Floating-point status word |
| def FPSW : X86Reg<"fpsw", 0>; |
| |
| // Status flags register. |
| // |
| // Note that some flags that are commonly thought of as part of the status |
| // flags register are modeled separately. Typically this is due to instructions |
| // reading and updating those flags independently of all the others. We don't |
| // want to create false dependencies between these instructions and so we use |
| // a separate register to model them. |
| def EFLAGS : X86Reg<"flags", 0>; |
| |
| // The direction flag. |
| def DF : X86Reg<"dirflag", 0>; |
| |
| |
| // Segment registers |
| def CS : X86Reg<"cs", 1>; |
| def DS : X86Reg<"ds", 3>; |
| def SS : X86Reg<"ss", 2>; |
| def ES : X86Reg<"es", 0>; |
| def FS : X86Reg<"fs", 4>; |
| def GS : X86Reg<"gs", 5>; |
| |
| // Debug registers |
| def DR0 : X86Reg<"dr0", 0>; |
| def DR1 : X86Reg<"dr1", 1>; |
| def DR2 : X86Reg<"dr2", 2>; |
| def DR3 : X86Reg<"dr3", 3>; |
| def DR4 : X86Reg<"dr4", 4>; |
| def DR5 : X86Reg<"dr5", 5>; |
| def DR6 : X86Reg<"dr6", 6>; |
| def DR7 : X86Reg<"dr7", 7>; |
| def DR8 : X86Reg<"dr8", 8>; |
| def DR9 : X86Reg<"dr9", 9>; |
| def DR10 : X86Reg<"dr10", 10>; |
| def DR11 : X86Reg<"dr11", 11>; |
| def DR12 : X86Reg<"dr12", 12>; |
| def DR13 : X86Reg<"dr13", 13>; |
| def DR14 : X86Reg<"dr14", 14>; |
| def DR15 : X86Reg<"dr15", 15>; |
| |
| // Control registers |
| def CR0 : X86Reg<"cr0", 0>; |
| def CR1 : X86Reg<"cr1", 1>; |
| def CR2 : X86Reg<"cr2", 2>; |
| def CR3 : X86Reg<"cr3", 3>; |
| def CR4 : X86Reg<"cr4", 4>; |
| def CR5 : X86Reg<"cr5", 5>; |
| def CR6 : X86Reg<"cr6", 6>; |
| def CR7 : X86Reg<"cr7", 7>; |
| def CR8 : X86Reg<"cr8", 8>; |
| def CR9 : X86Reg<"cr9", 9>; |
| def CR10 : X86Reg<"cr10", 10>; |
| def CR11 : X86Reg<"cr11", 11>; |
| def CR12 : X86Reg<"cr12", 12>; |
| def CR13 : X86Reg<"cr13", 13>; |
| def CR14 : X86Reg<"cr14", 14>; |
| def CR15 : X86Reg<"cr15", 15>; |
| |
| // Pseudo index registers |
| def EIZ : X86Reg<"eiz", 4>; |
| def RIZ : X86Reg<"riz", 4>; |
| |
| // Bound registers, used in MPX instructions |
| def BND0 : X86Reg<"bnd0", 0>; |
| def BND1 : X86Reg<"bnd1", 1>; |
| def BND2 : X86Reg<"bnd2", 2>; |
| def BND3 : X86Reg<"bnd3", 3>; |
| |
| // CET registers - Shadow Stack Pointer |
| def SSP : X86Reg<"ssp", 0>; |
| |
| //===----------------------------------------------------------------------===// |
| // Register Class Definitions... now that we have all of the pieces, define the |
| // top-level register classes. The order specified in the register list is |
| // implicitly defined to be the register allocation order. |
| // |
| |
| // List call-clobbered registers before callee-save registers. RBX, RBP, (and |
| // R12, R13, R14, and R15 for X86-64) are callee-save registers. |
| // In 64-mode, there are 12 additional i8 registers, SIL, DIL, BPL, SPL, and |
| // R8B, ... R15B. |
| // Allocate R12 and R13 last, as these require an extra byte when |
| // encoded in x86_64 instructions. |
| // FIXME: Allow AH, CH, DH, BH to be used as general-purpose registers in |
| // 64-bit mode. The main complication is that they cannot be encoded in an |
| // instruction requiring a REX prefix, while SIL, DIL, BPL, R8D, etc. |
| // require a REX prefix. For example, "addb %ah, %dil" and "movzbl %ah, %r8d" |
| // cannot be encoded. |
| def GR8 : RegisterClass<"X86", [i8], 8, |
| (add AL, CL, DL, AH, CH, DH, BL, BH, SIL, DIL, BPL, SPL, |
| R8B, R9B, R10B, R11B, R14B, R15B, R12B, R13B)> { |
| let AltOrders = [(sub GR8, AH, BH, CH, DH)]; |
| let AltOrderSelect = [{ |
| return MF.getSubtarget<X86Subtarget>().is64Bit(); |
| }]; |
| } |
| |
| let isAllocatable = 0 in |
| def GRH8 : RegisterClass<"X86", [i8], 8, |
| (add SIH, DIH, BPH, SPH, R8BH, R9BH, R10BH, R11BH, |
| R12BH, R13BH, R14BH, R15BH)>; |
| |
| def GR16 : RegisterClass<"X86", [i16], 16, |
| (add AX, CX, DX, SI, DI, BX, BP, SP, |
| R8W, R9W, R10W, R11W, R14W, R15W, R12W, R13W)>; |
| |
| let isAllocatable = 0 in |
| def GRH16 : RegisterClass<"X86", [i16], 16, |
| (add HAX, HCX, HDX, HSI, HDI, HBX, HBP, HSP, HIP, |
| R8WH, R9WH, R10WH, R11WH, R12WH, R13WH, R14WH, |
| R15WH)>; |
| |
| def GR32 : RegisterClass<"X86", [i32], 32, |
| (add EAX, ECX, EDX, ESI, EDI, EBX, EBP, ESP, |
| R8D, R9D, R10D, R11D, R14D, R15D, R12D, R13D)>; |
| |
| // GR64 - 64-bit GPRs. This oddly includes RIP, which isn't accurate, since |
| // RIP isn't really a register and it can't be used anywhere except in an |
| // address, but it doesn't cause trouble. |
| // FIXME: it *does* cause trouble - CheckBaseRegAndIndexReg() has extra |
| // tests because of the inclusion of RIP in this register class. |
| def GR64 : RegisterClass<"X86", [i64], 64, |
| (add RAX, RCX, RDX, RSI, RDI, R8, R9, R10, R11, |
| RBX, R14, R15, R12, R13, RBP, RSP, RIP)>; |
| |
| // Segment registers for use by MOV instructions (and others) that have a |
| // segment register as one operand. Always contain a 16-bit segment |
| // descriptor. |
| def SEGMENT_REG : RegisterClass<"X86", [i16], 16, (add CS, DS, SS, ES, FS, GS)>; |
| |
| // Debug registers. |
| def DEBUG_REG : RegisterClass<"X86", [i32], 32, (sequence "DR%u", 0, 15)>; |
| |
| // Control registers. |
| def CONTROL_REG : RegisterClass<"X86", [i64], 64, (sequence "CR%u", 0, 15)>; |
| |
| // GR8_ABCD_L, GR8_ABCD_H, GR16_ABCD, GR32_ABCD, GR64_ABCD - Subclasses of |
| // GR8, GR16, GR32, and GR64 which contain just the "a" "b", "c", and "d" |
| // registers. On x86-32, GR16_ABCD and GR32_ABCD are classes for registers |
| // that support 8-bit subreg operations. On x86-64, GR16_ABCD, GR32_ABCD, |
| // and GR64_ABCD are classes for registers that support 8-bit h-register |
| // operations. |
| def GR8_ABCD_L : RegisterClass<"X86", [i8], 8, (add AL, CL, DL, BL)>; |
| def GR8_ABCD_H : RegisterClass<"X86", [i8], 8, (add AH, CH, DH, BH)>; |
| def GR16_ABCD : RegisterClass<"X86", [i16], 16, (add AX, CX, DX, BX)>; |
| def GR32_ABCD : RegisterClass<"X86", [i32], 32, (add EAX, ECX, EDX, EBX)>; |
| def GR64_ABCD : RegisterClass<"X86", [i64], 64, (add RAX, RCX, RDX, RBX)>; |
| def GR32_TC : RegisterClass<"X86", [i32], 32, (add EAX, ECX, EDX)>; |
| def GR64_TC : RegisterClass<"X86", [i64], 64, (add RAX, RCX, RDX, RSI, RDI, |
| R8, R9, R11, RIP)>; |
| def GR64_TCW64 : RegisterClass<"X86", [i64], 64, (add RAX, RCX, RDX, |
| R8, R9, R10, R11, RIP)>; |
| |
| // GR8_NOREX - GR8 registers which do not require a REX prefix. |
| def GR8_NOREX : RegisterClass<"X86", [i8], 8, |
| (add AL, CL, DL, AH, CH, DH, BL, BH)> { |
| let AltOrders = [(sub GR8_NOREX, AH, BH, CH, DH)]; |
| let AltOrderSelect = [{ |
| return MF.getSubtarget<X86Subtarget>().is64Bit(); |
| }]; |
| } |
| // GR16_NOREX - GR16 registers which do not require a REX prefix. |
| def GR16_NOREX : RegisterClass<"X86", [i16], 16, |
| (add AX, CX, DX, SI, DI, BX, BP, SP)>; |
| // GR32_NOREX - GR32 registers which do not require a REX prefix. |
| def GR32_NOREX : RegisterClass<"X86", [i32], 32, |
| (add EAX, ECX, EDX, ESI, EDI, EBX, EBP, ESP)>; |
| // GR64_NOREX - GR64 registers which do not require a REX prefix. |
| def GR64_NOREX : RegisterClass<"X86", [i64], 64, |
| (add RAX, RCX, RDX, RSI, RDI, RBX, RBP, RSP, RIP)>; |
| |
| // GR32_NOSP - GR32 registers except ESP. |
| def GR32_NOSP : RegisterClass<"X86", [i32], 32, (sub GR32, ESP)>; |
| |
| // GR64_NOSP - GR64 registers except RSP (and RIP). |
| def GR64_NOSP : RegisterClass<"X86", [i64], 64, (sub GR64, RSP, RIP)>; |
| |
| // GR32_NOREX_NOSP - GR32 registers which do not require a REX prefix except |
| // ESP. |
| def GR32_NOREX_NOSP : RegisterClass<"X86", [i32], 32, |
| (and GR32_NOREX, GR32_NOSP)>; |
| |
| // GR64_NOREX_NOSP - GR64_NOREX registers except RSP. |
| def GR64_NOREX_NOSP : RegisterClass<"X86", [i64], 64, |
| (and GR64_NOREX, GR64_NOSP)>; |
| |
| // Register classes used for ABIs that use 32-bit address accesses, |
| // while using the whole x84_64 ISA. |
| |
| // In such cases, it is fine to use RIP as we are sure the 32 high |
| // bits are not set. We do not need variants for NOSP as RIP is not |
| // allowed there. |
| // RIP is not spilled anywhere for now, so stick to 32-bit alignment |
| // to save on memory space. |
| // FIXME: We could allow all 64bit registers, but we would need |
| // something to check that the 32 high bits are not set, |
| // which we do not have right now. |
| def LOW32_ADDR_ACCESS : RegisterClass<"X86", [i32], 32, (add GR32, RIP)>; |
| |
| // When RBP is used as a base pointer in a 32-bit addresses environement, |
| // this is also safe to use the full register to access addresses. |
| // Since RBP will never be spilled, stick to a 32 alignment to save |
| // on memory consumption. |
| def LOW32_ADDR_ACCESS_RBP : RegisterClass<"X86", [i32], 32, |
| (add LOW32_ADDR_ACCESS, RBP)>; |
| |
| // A class to support the 'A' assembler constraint: [ER]AX then [ER]DX. |
| def GR32_AD : RegisterClass<"X86", [i32], 32, (add EAX, EDX)>; |
| def GR64_AD : RegisterClass<"X86", [i64], 64, (add RAX, RDX)>; |
| |
| // Scalar SSE2 floating point registers. |
| def FR32 : RegisterClass<"X86", [f32], 32, (sequence "XMM%u", 0, 15)>; |
| |
| def FR64 : RegisterClass<"X86", [f64], 64, (add FR32)>; |
| |
| |
| // FIXME: This sets up the floating point register files as though they are f64 |
| // values, though they really are f80 values. This will cause us to spill |
| // values as 64-bit quantities instead of 80-bit quantities, which is much much |
| // faster on common hardware. In reality, this should be controlled by a |
| // command line option or something. |
| |
| def RFP32 : RegisterClass<"X86",[f32], 32, (sequence "FP%u", 0, 6)>; |
| def RFP64 : RegisterClass<"X86",[f64], 32, (add RFP32)>; |
| def RFP80 : RegisterClass<"X86",[f80], 32, (add RFP32)>; |
| |
| // Floating point stack registers (these are not allocatable by the |
| // register allocator - the floating point stackifier is responsible |
| // for transforming FPn allocations to STn registers) |
| def RST : RegisterClass<"X86", [f80, f64, f32], 32, (sequence "ST%u", 0, 7)> { |
| let isAllocatable = 0; |
| } |
| |
| // Generic vector registers: VR64 and VR128. |
| // Ensure that float types are declared first - only float is legal on SSE1. |
| def VR64: RegisterClass<"X86", [x86mmx], 64, (sequence "MM%u", 0, 7)>; |
| def VR128 : RegisterClass<"X86", [v4f32, v2f64, v16i8, v8i16, v4i32, v2i64, f128], |
| 128, (add FR32)>; |
| def VR256 : RegisterClass<"X86", [v8f32, v4f64, v32i8, v16i16, v8i32, v4i64], |
| 256, (sequence "YMM%u", 0, 15)>; |
| |
| // Special classes that help the assembly parser choose some alternate |
| // instructions to favor 2-byte VEX encodings. |
| def VR128L : RegisterClass<"X86", [v4f32, v2f64, v16i8, v8i16, v4i32, v2i64, f128], |
| 128, (sequence "XMM%u", 0, 7)>; |
| def VR128H : RegisterClass<"X86", [v4f32, v2f64, v16i8, v8i16, v4i32, v2i64, f128], |
| 128, (sequence "XMM%u", 8, 15)>; |
| def VR256L : RegisterClass<"X86", [v8f32, v4f64, v32i8, v16i16, v8i32, v4i64], |
| 256, (sequence "YMM%u", 0, 7)>; |
| def VR256H : RegisterClass<"X86", [v8f32, v4f64, v32i8, v16i16, v8i32, v4i64], |
| 256, (sequence "YMM%u", 8, 15)>; |
| |
| // Status flags registers. |
| def CCR : RegisterClass<"X86", [i32], 32, (add EFLAGS)> { |
| let CopyCost = -1; // Don't allow copying of status registers. |
| let isAllocatable = 0; |
| } |
| def FPCCR : RegisterClass<"X86", [i16], 16, (add FPSW)> { |
| let CopyCost = -1; // Don't allow copying of status registers. |
| let isAllocatable = 0; |
| } |
| def DFCCR : RegisterClass<"X86", [i32], 32, (add DF)> { |
| let CopyCost = -1; // Don't allow copying of status registers. |
| let isAllocatable = 0; |
| } |
| |
| // AVX-512 vector/mask registers. |
| def VR512 : RegisterClass<"X86", [v16f32, v8f64, v64i8, v32i16, v16i32, v8i64], |
| 512, (sequence "ZMM%u", 0, 31)>; |
| |
| // Scalar AVX-512 floating point registers. |
| def FR32X : RegisterClass<"X86", [f32], 32, (sequence "XMM%u", 0, 31)>; |
| |
| def FR64X : RegisterClass<"X86", [f64], 64, (add FR32X)>; |
| |
| // Extended VR128 and VR256 for AVX-512 instructions |
| def VR128X : RegisterClass<"X86", [v4f32, v2f64, v16i8, v8i16, v4i32, v2i64, f128], |
| 128, (add FR32X)>; |
| def VR256X : RegisterClass<"X86", [v8f32, v4f64, v32i8, v16i16, v8i32, v4i64], |
| 256, (sequence "YMM%u", 0, 31)>; |
| |
| // Mask registers |
| def VK1 : RegisterClass<"X86", [v1i1], 16, (sequence "K%u", 0, 7)> {let Size = 16;} |
| def VK2 : RegisterClass<"X86", [v2i1], 16, (add VK1)> {let Size = 16;} |
| def VK4 : RegisterClass<"X86", [v4i1], 16, (add VK2)> {let Size = 16;} |
| def VK8 : RegisterClass<"X86", [v8i1], 16, (add VK4)> {let Size = 16;} |
| def VK16 : RegisterClass<"X86", [v16i1], 16, (add VK8)> {let Size = 16;} |
| def VK32 : RegisterClass<"X86", [v32i1], 32, (add VK16)> {let Size = 32;} |
| def VK64 : RegisterClass<"X86", [v64i1], 64, (add VK32)> {let Size = 64;} |
| |
| def VK1WM : RegisterClass<"X86", [v1i1], 16, (sub VK1, K0)> {let Size = 16;} |
| def VK2WM : RegisterClass<"X86", [v2i1], 16, (sub VK2, K0)> {let Size = 16;} |
| def VK4WM : RegisterClass<"X86", [v4i1], 16, (sub VK4, K0)> {let Size = 16;} |
| def VK8WM : RegisterClass<"X86", [v8i1], 16, (sub VK8, K0)> {let Size = 16;} |
| def VK16WM : RegisterClass<"X86", [v16i1], 16, (add VK8WM)> {let Size = 16;} |
| def VK32WM : RegisterClass<"X86", [v32i1], 32, (add VK16WM)> {let Size = 32;} |
| def VK64WM : RegisterClass<"X86", [v64i1], 64, (add VK32WM)> {let Size = 64;} |
| |
| // Bound registers |
| def BNDR : RegisterClass<"X86", [v2i64], 128, (sequence "BND%u", 0, 3)>; |
