| //===-- AVRRegisterInfo.td - AVR Register defs -------------*- tablegen -*-===// |
| // |
| // 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 |
| // |
| //===----------------------------------------------------------------------===// |
| |
| //===----------------------------------------------------------------------===// |
| // Declarations that describe the AVR register file |
| //===----------------------------------------------------------------------===// |
| |
| // 8-bit General purpose register definition. |
| class AVRReg<bits<16> num, string name, list<Register> subregs = [], |
| list<string> altNames = []> : RegisterWithSubRegs<name, subregs> { |
| field bits<16> Num = num; |
| |
| let HWEncoding = num; |
| let Namespace = "AVR"; |
| let SubRegs = subregs; |
| let AltNames = altNames; |
| } |
| |
| // Subregister indices. |
| let Namespace = "AVR" in { |
| def sub_lo : SubRegIndex<8>; |
| def sub_hi : SubRegIndex<8, 8>; |
| } |
| |
| let Namespace = "AVR" in { def ptr : RegAltNameIndex; } |
| |
| //===----------------------------------------------------------------------===// |
| // 8-bit general purpose registers |
| //===----------------------------------------------------------------------===// |
| |
| def R0 : AVRReg<0, "r0">, DwarfRegNum<[0]>; |
| def R1 : AVRReg<1, "r1">, DwarfRegNum<[1]>; |
| def R2 : AVRReg<2, "r2">, DwarfRegNum<[2]>; |
| def R3 : AVRReg<3, "r3">, DwarfRegNum<[3]>; |
| def R4 : AVRReg<4, "r4">, DwarfRegNum<[4]>; |
| def R5 : AVRReg<5, "r5">, DwarfRegNum<[5]>; |
| def R6 : AVRReg<6, "r6">, DwarfRegNum<[6]>; |
| def R7 : AVRReg<7, "r7">, DwarfRegNum<[7]>; |
| def R8 : AVRReg<8, "r8">, DwarfRegNum<[8]>; |
| def R9 : AVRReg<9, "r9">, DwarfRegNum<[9]>; |
| def R10 : AVRReg<10, "r10">, DwarfRegNum<[10]>; |
| def R11 : AVRReg<11, "r11">, DwarfRegNum<[11]>; |
| def R12 : AVRReg<12, "r12">, DwarfRegNum<[12]>; |
| def R13 : AVRReg<13, "r13">, DwarfRegNum<[13]>; |
| def R14 : AVRReg<14, "r14">, DwarfRegNum<[14]>; |
| def R15 : AVRReg<15, "r15">, DwarfRegNum<[15]>; |
| def R16 : AVRReg<16, "r16">, DwarfRegNum<[16]>; |
| def R17 : AVRReg<17, "r17">, DwarfRegNum<[17]>; |
| def R18 : AVRReg<18, "r18">, DwarfRegNum<[18]>; |
| def R19 : AVRReg<19, "r19">, DwarfRegNum<[19]>; |
| def R20 : AVRReg<20, "r20">, DwarfRegNum<[20]>; |
| def R21 : AVRReg<21, "r21">, DwarfRegNum<[21]>; |
| def R22 : AVRReg<22, "r22">, DwarfRegNum<[22]>; |
| def R23 : AVRReg<23, "r23">, DwarfRegNum<[23]>; |
| def R24 : AVRReg<24, "r24">, DwarfRegNum<[24]>; |
| def R25 : AVRReg<25, "r25">, DwarfRegNum<[25]>; |
| def R26 : AVRReg<26, "r26", [], ["xl"]>, DwarfRegNum<[26]>; |
| def R27 : AVRReg<27, "r27", [], ["xh"]>, DwarfRegNum<[27]>; |
| def R28 : AVRReg<28, "r28", [], ["yl"]>, DwarfRegNum<[28]>; |
| def R29 : AVRReg<29, "r29", [], ["yh"]>, DwarfRegNum<[29]>; |
| def R30 : AVRReg<30, "r30", [], ["zl"]>, DwarfRegNum<[30]>; |
| def R31 : AVRReg<31, "r31", [], ["zh"]>, DwarfRegNum<[31]>; |
| def SPL : AVRReg<32, "SPL">, DwarfRegNum<[32]>; |
| def SPH : AVRReg<33, "SPH">, DwarfRegNum<[33]>; |
| |
| let SubRegIndices = [sub_lo, sub_hi], CoveredBySubRegs = 1 in { |
| // 16 bit GPR pairs. |
| def SP : AVRReg<32, "SP", [SPL, SPH]>, DwarfRegNum<[32]>; |
| |
| // The pointer registers (X,Y,Z) are a special case because they |
| // are printed as a `high:low` pair when a DREG is expected, |
| // but printed using `X`, `Y`, `Z` when a pointer register is expected. |
| let RegAltNameIndices = [ptr] in { |
| def R31R30 : AVRReg<30, "r31:r30", [R30, R31], ["Z"]>, DwarfRegNum<[30]>; |
| def R29R28 : AVRReg<28, "r29:r28", [R28, R29], ["Y"]>, DwarfRegNum<[28]>; |
| def R27R26 : AVRReg<26, "r27:r26", [R26, R27], ["X"]>, DwarfRegNum<[26]>; |
| } |
| def R25R24 : AVRReg<24, "r25:r24", [R24, R25]>, DwarfRegNum<[24]>; |
| def R23R22 : AVRReg<22, "r23:r22", [R22, R23]>, DwarfRegNum<[22]>; |
| def R21R20 : AVRReg<20, "r21:r20", [R20, R21]>, DwarfRegNum<[20]>; |
| def R19R18 : AVRReg<18, "r19:r18", [R18, R19]>, DwarfRegNum<[18]>; |
| def R17R16 : AVRReg<16, "r17:r16", [R16, R17]>, DwarfRegNum<[16]>; |
| def R15R14 : AVRReg<14, "r15:r14", [R14, R15]>, DwarfRegNum<[14]>; |
| def R13R12 : AVRReg<12, "r13:r12", [R12, R13]>, DwarfRegNum<[12]>; |
| def R11R10 : AVRReg<10, "r11:r10", [R10, R11]>, DwarfRegNum<[10]>; |
| def R9R8 : AVRReg<8, "r9:r8", [R8, R9]>, DwarfRegNum<[8]>; |
| def R7R6 : AVRReg<6, "r7:r6", [R6, R7]>, DwarfRegNum<[6]>; |
| def R5R4 : AVRReg<4, "r5:r4", [R4, R5]>, DwarfRegNum<[4]>; |
| def R3R2 : AVRReg<2, "r3:r2", [R2, R3]>, DwarfRegNum<[2]>; |
| def R1R0 : AVRReg<0, "r1:r0", [R0, R1]>, DwarfRegNum<[0]>; |
| |
| // Pseudo registers for unaligned i16 |
| def R26R25 : AVRReg<25, "r26:r25", [R25, R26]>, DwarfRegNum<[25]>; |
| def R24R23 : AVRReg<23, "r24:r23", [R23, R24]>, DwarfRegNum<[23]>; |
| def R22R21 : AVRReg<21, "r22:r21", [R21, R22]>, DwarfRegNum<[21]>; |
| def R20R19 : AVRReg<19, "r20:r19", [R19, R20]>, DwarfRegNum<[19]>; |
| def R18R17 : AVRReg<17, "r18:r17", [R17, R18]>, DwarfRegNum<[17]>; |
| def R16R15 : AVRReg<15, "r16:r15", [R15, R16]>, DwarfRegNum<[15]>; |
| def R14R13 : AVRReg<13, "r14:r13", [R13, R14]>, DwarfRegNum<[13]>; |
| def R12R11 : AVRReg<11, "r12:r11", [R11, R12]>, DwarfRegNum<[11]>; |
| def R10R9 : AVRReg<9, "r10:r9", [R9, R10]>, DwarfRegNum<[9]>; |
| } |
| |
| //===----------------------------------------------------------------------===// |
| // Register Classes |
| //===----------------------------------------------------------------------===// |
| |
| // Main 8-bit register class. |
| def GPR8 : RegisterClass<"AVR", [i8], 8, |
| ( |
| // Return value and argument registers. |
| add R24, R25, R18, R19, R20, R21, R22, R23, |
| // Scratch registers. |
| R30, R31, R26, R27, |
| // Callee saved registers. |
| R28, R29, R17, R16, R15, R14, R13, R12, R11, R10, |
| R9, R8, R7, R6, R5, R4, R3, R2, R0, R1)>; |
| |
| // Simple lower registers r0..r15 |
| def GPR8lo : RegisterClass<"AVR", [i8], 8, |
| (add R15, R14, R13, R12, R11, R10, R9, R8, R7, R6, |
| R5, R4, R3, R2, R0, R1)>; |
| |
| // 8-bit register class for instructions which take immediates. |
| def LD8 : RegisterClass<"AVR", [i8], 8, |
| ( |
| // Return value and arguments. |
| add R24, R25, R18, R19, R20, R21, R22, R23, |
| // Scratch registers. |
| R30, R31, R26, R27, |
| // Callee saved registers. |
| R28, R29, R17, R16)>; |
| |
| // Simple lower registers r16..r23 |
| def LD8lo : RegisterClass<"AVR", [i8], 8, |
| (add R23, R22, R21, R20, R19, R18, R17, R16)>; |
| |
| // Main 16-bit pair register class. |
| def DREGS : RegisterClass<"AVR", [i16], 8, |
| ( |
| // Return value and arguments. |
| add R25R24, R19R18, R21R20, R23R22, |
| // Scratch registers. |
| R31R30, R27R26, |
| // Callee saved registers. |
| R29R28, R17R16, R15R14, R13R12, R11R10, R9R8, |
| R7R6, R5R4, R3R2, R1R0, |
| // Pseudo regs for unaligned 16-bits |
| R26R25, R24R23, R22R21, R20R19, R18R17, R16R15, |
| R14R13, R12R11, R10R9)>; |
| |
| // Lower 16-bit pair registers in R0..R15, only used in inline assembly. |
| def DREGSlo |
| : RegisterClass<"AVR", [i16], 8, |
| (add R15R14, R13R12, R11R10, R9R8, R7R6, R5R4, R3R2, R1R0)>; |
| |
| // Lower 16-bit pair registers in r16..r23, only used in inline assembly. |
| def DREGSLD8lo : RegisterClass<"AVR", [i16], 8, |
| ( |
| // Return value and arguments. |
| add R19R18, R21R20, R23R22, |
| // Callee saved registers. |
| R17R16)>; |
| |
| // 16-bit pair register class for movw |
| def DREGSMOVW : RegisterClass<"AVR", [i16], 8, |
| ( |
| // Return value and arguments. |
| add R25R24, R19R18, R21R20, R23R22, |
| // Scratch registers. |
| R31R30, R27R26, |
| // Callee saved registers. |
| R29R28, R17R16, R15R14, R13R12, R11R10, R9R8, |
| R7R6, R5R4, R3R2, R1R0)>; |
| |
| // The 16-bit DREGS register class, excluding the Z pointer register. |
| // |
| // This is used by instructions which cause high pointer register |
| // contention which leads to an assertion in the register allocator. |
| // |
| // There is no technical reason why instructions that use this class |
| // cannot use Z; it's simply a workaround a regalloc bug. |
| // |
| // More information can be found in PR39553. |
| def DREGS_WITHOUT_YZ_WORKAROUND |
| : RegisterClass<"AVR", [i16], 8, |
| ( |
| // Return value and arguments. |
| add R25R24, R19R18, R21R20, R23R22, |
| // Scratch registers. |
| R27R26, |
| // Callee saved registers. |
| R17R16, R15R14, R13R12, R11R10, R9R8, R7R6, R5R4, R3R2, |
| R1R0)>; |
| |
| // 16-bit register class for immediate instructions. |
| def DLDREGS : RegisterClass<"AVR", [i16], 8, |
| ( |
| // Return value and arguments. |
| add R25R24, R19R18, R21R20, R23R22, |
| // Scratch registers. |
| R31R30, R27R26, |
| // Callee saved registers. |
| R29R28, R17R16)>; |
| |
| // 16-bit register class for the adiw/sbiw instructions. |
| def IWREGS : RegisterClass<"AVR", [i16], 8, |
| ( |
| // Return value and arguments. |
| add R25R24, |
| // Scratch registers. |
| R31R30, R27R26, |
| // Callee saved registers. |
| R29R28)>; |
| |
| // 16-bit register class for the ld and st instructions. |
| // AKA X,Y, and Z |
| def PTRREGS : RegisterClass<"AVR", [i16], 8, |
| (add R27R26, // X |
| R29R28, // Y |
| R31R30 // Z |
| ), |
| ptr>; |
| |
| // 16-bit register class for the ldd and std instructions. |
| // AKA Y and Z. |
| def PTRDISPREGS : RegisterClass<"AVR", [i16], 8, (add R31R30, R29R28), ptr>; |
| |
| // We have a bunch of instructions with an explicit Z register argument. We |
| // model this using a register class containing only the Z register. |
| def ZREG : RegisterClass<"AVR", [i16], 8, (add R31R30)>; |
| |
| // Register class used for the stack read pseudo instruction. |
| def GPRSP : RegisterClass<"AVR", [i16], 8, (add SP)>; |
| |
| // Status register. |
| def SREG : AVRReg<14, "FLAGS">, DwarfRegNum<[88]>; |
| def CCR : RegisterClass<"AVR", [i8], 8, (add SREG)> { |
| let CopyCost = -1; // Don't allow copying of status registers |
| } |
