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[llvm-project.git] / llvm / lib / Target / AVR / AVRRegisterInfo.td
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1 //===-- AVRRegisterInfo.td - AVR Register defs -------------*- tablegen -*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
9 //===----------------------------------------------------------------------===//
10 //  Declarations that describe the AVR register file
11 //===----------------------------------------------------------------------===//
13 // 8-bit General purpose register definition.
14 class AVRReg<bits<16> num, string name, list<Register> subregs = [],
15              list<string> altNames = []> : RegisterWithSubRegs<name, subregs> {
16   field bits<16> Num = num;
18   let HWEncoding = num;
19   let Namespace = "AVR";
20   let SubRegs = subregs;
21   let AltNames = altNames;
24 // Subregister indices.
25 let Namespace = "AVR" in {
26   def sub_lo : SubRegIndex<8>;
27   def sub_hi : SubRegIndex<8, 8>;
30 let Namespace = "AVR" in { def ptr : RegAltNameIndex; }
32 //===----------------------------------------------------------------------===//
33 //  8-bit general purpose registers
34 //===----------------------------------------------------------------------===//
36 def R0 : AVRReg<0, "r0">, DwarfRegNum<[0]>;
37 def R1 : AVRReg<1, "r1">, DwarfRegNum<[1]>;
38 def R2 : AVRReg<2, "r2">, DwarfRegNum<[2]>;
39 def R3 : AVRReg<3, "r3">, DwarfRegNum<[3]>;
40 def R4 : AVRReg<4, "r4">, DwarfRegNum<[4]>;
41 def R5 : AVRReg<5, "r5">, DwarfRegNum<[5]>;
42 def R6 : AVRReg<6, "r6">, DwarfRegNum<[6]>;
43 def R7 : AVRReg<7, "r7">, DwarfRegNum<[7]>;
44 def R8 : AVRReg<8, "r8">, DwarfRegNum<[8]>;
45 def R9 : AVRReg<9, "r9">, DwarfRegNum<[9]>;
46 def R10 : AVRReg<10, "r10">, DwarfRegNum<[10]>;
47 def R11 : AVRReg<11, "r11">, DwarfRegNum<[11]>;
48 def R12 : AVRReg<12, "r12">, DwarfRegNum<[12]>;
49 def R13 : AVRReg<13, "r13">, DwarfRegNum<[13]>;
50 def R14 : AVRReg<14, "r14">, DwarfRegNum<[14]>;
51 def R15 : AVRReg<15, "r15">, DwarfRegNum<[15]>;
52 def R16 : AVRReg<16, "r16">, DwarfRegNum<[16]>;
53 def R17 : AVRReg<17, "r17">, DwarfRegNum<[17]>;
54 def R18 : AVRReg<18, "r18">, DwarfRegNum<[18]>;
55 def R19 : AVRReg<19, "r19">, DwarfRegNum<[19]>;
56 def R20 : AVRReg<20, "r20">, DwarfRegNum<[20]>;
57 def R21 : AVRReg<21, "r21">, DwarfRegNum<[21]>;
58 def R22 : AVRReg<22, "r22">, DwarfRegNum<[22]>;
59 def R23 : AVRReg<23, "r23">, DwarfRegNum<[23]>;
60 def R24 : AVRReg<24, "r24">, DwarfRegNum<[24]>;
61 def R25 : AVRReg<25, "r25">, DwarfRegNum<[25]>;
62 def R26 : AVRReg<26, "r26", [], ["xl"]>, DwarfRegNum<[26]>;
63 def R27 : AVRReg<27, "r27", [], ["xh"]>, DwarfRegNum<[27]>;
64 def R28 : AVRReg<28, "r28", [], ["yl"]>, DwarfRegNum<[28]>;
65 def R29 : AVRReg<29, "r29", [], ["yh"]>, DwarfRegNum<[29]>;
66 def R30 : AVRReg<30, "r30", [], ["zl"]>, DwarfRegNum<[30]>;
67 def R31 : AVRReg<31, "r31", [], ["zh"]>, DwarfRegNum<[31]>;
68 def SPL : AVRReg<32, "SPL">, DwarfRegNum<[32]>;
69 def SPH : AVRReg<33, "SPH">, DwarfRegNum<[33]>;
71 let SubRegIndices = [sub_lo, sub_hi], CoveredBySubRegs = 1 in {
72   // 16 bit GPR pairs.
73   def SP : AVRReg<32, "SP", [SPL, SPH]>, DwarfRegNum<[32]>;
75   // The pointer registers (X,Y,Z) are a special case because they
76   // are printed as a `high:low` pair when a DREG is expected,
77   // but printed using `X`, `Y`, `Z` when a pointer register is expected.
78   let RegAltNameIndices = [ptr] in {
79     def R31R30 : AVRReg<30, "r31:r30", [R30, R31], ["Z"]>, DwarfRegNum<[30]>;
80     def R29R28 : AVRReg<28, "r29:r28", [R28, R29], ["Y"]>, DwarfRegNum<[28]>;
81     def R27R26 : AVRReg<26, "r27:r26", [R26, R27], ["X"]>, DwarfRegNum<[26]>;
82   }
83   def R25R24 : AVRReg<24, "r25:r24", [R24, R25]>, DwarfRegNum<[24]>;
84   def R23R22 : AVRReg<22, "r23:r22", [R22, R23]>, DwarfRegNum<[22]>;
85   def R21R20 : AVRReg<20, "r21:r20", [R20, R21]>, DwarfRegNum<[20]>;
86   def R19R18 : AVRReg<18, "r19:r18", [R18, R19]>, DwarfRegNum<[18]>;
87   def R17R16 : AVRReg<16, "r17:r16", [R16, R17]>, DwarfRegNum<[16]>;
88   def R15R14 : AVRReg<14, "r15:r14", [R14, R15]>, DwarfRegNum<[14]>;
89   def R13R12 : AVRReg<12, "r13:r12", [R12, R13]>, DwarfRegNum<[12]>;
90   def R11R10 : AVRReg<10, "r11:r10", [R10, R11]>, DwarfRegNum<[10]>;
91   def R9R8 : AVRReg<8, "r9:r8", [R8, R9]>, DwarfRegNum<[8]>;
92   def R7R6 : AVRReg<6, "r7:r6", [R6, R7]>, DwarfRegNum<[6]>;
93   def R5R4 : AVRReg<4, "r5:r4", [R4, R5]>, DwarfRegNum<[4]>;
94   def R3R2 : AVRReg<2, "r3:r2", [R2, R3]>, DwarfRegNum<[2]>;
95   def R1R0 : AVRReg<0, "r1:r0", [R0, R1]>, DwarfRegNum<[0]>;
97   // Pseudo registers for unaligned i16
98   def R26R25 : AVRReg<25, "r26:r25", [R25, R26]>, DwarfRegNum<[25]>;
99   def R24R23 : AVRReg<23, "r24:r23", [R23, R24]>, DwarfRegNum<[23]>;
100   def R22R21 : AVRReg<21, "r22:r21", [R21, R22]>, DwarfRegNum<[21]>;
101   def R20R19 : AVRReg<19, "r20:r19", [R19, R20]>, DwarfRegNum<[19]>;
102   def R18R17 : AVRReg<17, "r18:r17", [R17, R18]>, DwarfRegNum<[17]>;
103   def R16R15 : AVRReg<15, "r16:r15", [R15, R16]>, DwarfRegNum<[15]>;
104   def R14R13 : AVRReg<13, "r14:r13", [R13, R14]>, DwarfRegNum<[13]>;
105   def R12R11 : AVRReg<11, "r12:r11", [R11, R12]>, DwarfRegNum<[11]>;
106   def R10R9 : AVRReg<9, "r10:r9", [R9, R10]>, DwarfRegNum<[9]>;
109 //===----------------------------------------------------------------------===//
110 // Register Classes
111 //===----------------------------------------------------------------------===//
113 // Main 8-bit register class.
114 def GPR8 : RegisterClass<"AVR", [i8], 8,
115                          (
116                              // Return value and argument registers.
117                              add R24, R25, R18, R19, R20, R21, R22, R23,
118                              // Scratch registers.
119                              R30, R31, R26, R27,
120                              // Callee saved registers.
121                              R28, R29, R17, R16, R15, R14, R13, R12, R11, R10,
122                              R9, R8, R7, R6, R5, R4, R3, R2, R0, R1)>;
124 // Simple lower registers r0..r15
125 def GPR8lo : RegisterClass<"AVR", [i8], 8,
126                            (add R15, R14, R13, R12, R11, R10, R9, R8, R7, R6,
127                             R5, R4, R3, R2, R0, R1)>;
129 // 8-bit register class for instructions which take immediates.
130 def LD8 : RegisterClass<"AVR", [i8], 8,
131                         (
132                             // Return value and arguments.
133                             add R24, R25, R18, R19, R20, R21, R22, R23,
134                             // Scratch registers.
135                             R30, R31, R26, R27,
136                             // Callee saved registers.
137                             R28, R29, R17, R16)>;
139 // Simple lower registers r16..r23
140 def LD8lo : RegisterClass<"AVR", [i8], 8,
141                           (add R23, R22, R21, R20, R19, R18, R17, R16)>;
143 // Main 16-bit pair register class.
144 def DREGS : RegisterClass<"AVR", [i16], 8,
145                           (
146                               // Return value and arguments.
147                               add R25R24, R19R18, R21R20, R23R22,
148                               // Scratch registers.
149                               R31R30, R27R26,
150                               // Callee saved registers.
151                               R29R28, R17R16, R15R14, R13R12, R11R10, R9R8,
152                               R7R6, R5R4, R3R2, R1R0,
153                               // Pseudo regs for unaligned 16-bits
154                               R26R25, R24R23, R22R21, R20R19, R18R17, R16R15,
155                               R14R13, R12R11, R10R9)>;
157 // Lower 16-bit pair registers in R0..R15, only used in inline assembly.
158 def DREGSlo
159     : RegisterClass<"AVR", [i16], 8,
160                     (add R15R14, R13R12, R11R10, R9R8, R7R6, R5R4, R3R2, R1R0)>;
162 // Lower 16-bit pair registers in r16..r23, only used in inline assembly.
163 def DREGSLD8lo : RegisterClass<"AVR", [i16], 8,
164                                (
165                                    // Return value and arguments.
166                                    add R19R18, R21R20, R23R22,
167                                    // Callee saved registers.
168                                    R17R16)>;
170 // 16-bit pair register class for movw
171 def DREGSMOVW : RegisterClass<"AVR", [i16], 8,
172                               (
173                                   // Return value and arguments.
174                                   add R25R24, R19R18, R21R20, R23R22,
175                                   // Scratch registers.
176                                   R31R30, R27R26,
177                                   // Callee saved registers.
178                                   R29R28, R17R16, R15R14, R13R12, R11R10, R9R8,
179                                   R7R6, R5R4, R3R2, R1R0)>;
181 // 16-bit register class for immediate instructions.
182 def DLDREGS : RegisterClass<"AVR", [i16], 8,
183                             (
184                                 // Return value and arguments.
185                                 add R25R24, R19R18, R21R20, R23R22,
186                                 // Scratch registers.
187                                 R31R30, R27R26,
188                                 // Callee saved registers.
189                                 R29R28, R17R16)>;
191 // 16-bit register class for the adiw/sbiw instructions.
192 def IWREGS : RegisterClass<"AVR", [i16], 8,
193                            (
194                                // Return value and arguments.
195                                add R25R24,
196                                // Scratch registers.
197                                R31R30, R27R26,
198                                // Callee saved registers.
199                                R29R28)>;
201 // 16-bit register class for the ld and st instructions.
202 // AKA X,Y, and Z
203 def PTRREGS : RegisterClass<"AVR", [i16], 8,
204                             (add R27R26, // X
205                              R29R28,     // Y
206                              R31R30),    // Z
207                             ptr>;
209 // 16-bit register class for the ldd and std instructions.
210 // AKA Y and Z.
211 def PTRDISPREGS : RegisterClass<"AVR", [i16], 8, (add R31R30, R29R28), ptr>;
213 // We have a bunch of instructions with an explicit Z register argument. We
214 // model this using a register class containing only the Z register.
215 def ZREG : RegisterClass<"AVR", [i16], 8, (add R31R30)>;
217 // Register class used for the stack read pseudo instruction.
218 def GPRSP : RegisterClass<"AVR", [i16], 8, (add SP)>;
220 // Status register.
221 def SREG : AVRReg<14, "FLAGS">, DwarfRegNum<[88]>;
222 def CCR : RegisterClass<"AVR", [i8], 8, (add SREG)> {
223   let CopyCost = -1; // Don't allow copying of status registers