1 //===-- AVRRegisterInfo.td - AVR Register defs -------------*- tablegen -*-===//
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
7 //===----------------------------------------------------------------------===//
9 //===----------------------------------------------------------------------===//
10 // Declarations that describe the AVR register file
11 //===----------------------------------------------------------------------===//
13 // 8-bit General purpose register definition.
14 class AVRReg<bits<16> num,
16 list<Register> subregs = [],
17 list<string> altNames = []>
18 : RegisterWithSubRegs<name, subregs>
20 field bits<16> Num = num;
23 let Namespace = "AVR";
24 let SubRegs = subregs;
25 let AltNames = altNames;
28 // Subregister indices.
29 let Namespace = "AVR" in
31 def sub_lo : SubRegIndex<8>;
32 def sub_hi : SubRegIndex<8, 8>;
35 let Namespace = "AVR" in {
36 def ptr : RegAltNameIndex;
40 //===----------------------------------------------------------------------===//
41 // 8-bit general purpose registers
42 //===----------------------------------------------------------------------===//
44 def R0 : AVRReg<0, "r0">, DwarfRegNum<[0]>;
45 def R1 : AVRReg<1, "r1">, DwarfRegNum<[1]>;
46 def R2 : AVRReg<2, "r2">, DwarfRegNum<[2]>;
47 def R3 : AVRReg<3, "r3">, DwarfRegNum<[3]>;
48 def R4 : AVRReg<4, "r4">, DwarfRegNum<[4]>;
49 def R5 : AVRReg<5, "r5">, DwarfRegNum<[5]>;
50 def R6 : AVRReg<6, "r6">, DwarfRegNum<[6]>;
51 def R7 : AVRReg<7, "r7">, DwarfRegNum<[7]>;
52 def R8 : AVRReg<8, "r8">, DwarfRegNum<[8]>;
53 def R9 : AVRReg<9, "r9">, DwarfRegNum<[9]>;
54 def R10 : AVRReg<10, "r10">, DwarfRegNum<[10]>;
55 def R11 : AVRReg<11, "r11">, DwarfRegNum<[11]>;
56 def R12 : AVRReg<12, "r12">, DwarfRegNum<[12]>;
57 def R13 : AVRReg<13, "r13">, DwarfRegNum<[13]>;
58 def R14 : AVRReg<14, "r14">, DwarfRegNum<[14]>;
59 def R15 : AVRReg<15, "r15">, DwarfRegNum<[15]>;
60 def R16 : AVRReg<16, "r16">, DwarfRegNum<[16]>;
61 def R17 : AVRReg<17, "r17">, DwarfRegNum<[17]>;
62 def R18 : AVRReg<18, "r18">, DwarfRegNum<[18]>;
63 def R19 : AVRReg<19, "r19">, DwarfRegNum<[19]>;
64 def R20 : AVRReg<20, "r20">, DwarfRegNum<[20]>;
65 def R21 : AVRReg<21, "r21">, DwarfRegNum<[21]>;
66 def R22 : AVRReg<22, "r22">, DwarfRegNum<[22]>;
67 def R23 : AVRReg<23, "r23">, DwarfRegNum<[23]>;
68 def R24 : AVRReg<24, "r24">, DwarfRegNum<[24]>;
69 def R25 : AVRReg<25, "r25">, DwarfRegNum<[25]>;
70 def R26 : AVRReg<26, "r26">, DwarfRegNum<[26]>;
71 def R27 : AVRReg<27, "r27">, DwarfRegNum<[27]>;
72 def R28 : AVRReg<28, "r28">, DwarfRegNum<[28]>;
73 def R29 : AVRReg<29, "r29">, DwarfRegNum<[29]>;
74 def R30 : AVRReg<30, "r30">, DwarfRegNum<[30]>;
75 def R31 : AVRReg<31, "r31">, DwarfRegNum<[31]>;
76 def SPL : AVRReg<32, "SPL">, DwarfRegNum<[32]>;
77 def SPH : AVRReg<33, "SPH">, DwarfRegNum<[33]>;
79 let SubRegIndices = [sub_lo, sub_hi],
80 CoveredBySubRegs = 1 in
83 def SP : AVRReg<32, "SP", [SPL, SPH]>, DwarfRegNum<[32]>;
85 // The pointer registers (X,Y,Z) are a special case because they
86 // are printed as a `high:low` pair when a DREG is expected,
87 // but printed using `X`, `Y`, `Z` when a pointer register is expected.
88 let RegAltNameIndices = [ptr] in {
89 def R31R30 : AVRReg<30, "r31:r30", [R30, R31], ["Z"]>, DwarfRegNum<[30]>;
90 def R29R28 : AVRReg<28, "r29:r28", [R28, R29], ["Y"]>, DwarfRegNum<[28]>;
91 def R27R26 : AVRReg<26, "r27:r26", [R26, R27], ["X"]>, DwarfRegNum<[26]>;
93 def R25R24 : AVRReg<24, "r25:r24", [R24, R25]>, DwarfRegNum<[24]>;
94 def R23R22 : AVRReg<22, "r23:r22", [R22, R23]>, DwarfRegNum<[22]>;
95 def R21R20 : AVRReg<20, "r21:r20", [R20, R21]>, DwarfRegNum<[20]>;
96 def R19R18 : AVRReg<18, "r19:r18", [R18, R19]>, DwarfRegNum<[18]>;
97 def R17R16 : AVRReg<16, "r17:r16", [R16, R17]>, DwarfRegNum<[16]>;
98 def R15R14 : AVRReg<14, "r15:r14", [R14, R15]>, DwarfRegNum<[14]>;
99 def R13R12 : AVRReg<12, "r13:r12", [R12, R13]>, DwarfRegNum<[12]>;
100 def R11R10 : AVRReg<10, "r11:r10", [R10, R11]>, DwarfRegNum<[10]>;
101 def R9R8 : AVRReg<8, "r9:r8", [R8, R9]>, DwarfRegNum<[8]>;
102 def R7R6 : AVRReg<6, "r7:r6", [R6, R7]>, DwarfRegNum<[6]>;
103 def R5R4 : AVRReg<4, "r5:r4", [R4, R5]>, DwarfRegNum<[4]>;
104 def R3R2 : AVRReg<2, "r3:r2", [R2, R3]>, DwarfRegNum<[2]>;
105 def R1R0 : AVRReg<0, "r1:r0", [R0, R1]>, DwarfRegNum<[0]>;
107 // Pseudo registers for unaligned i16
108 def R26R25 : AVRReg<25, "r26:r25", [R25, R26]>, DwarfRegNum<[25]>;
109 def R24R23 : AVRReg<23, "r24:r23", [R23, R24]>, DwarfRegNum<[23]>;
110 def R22R21 : AVRReg<21, "r22:r21", [R21, R22]>, DwarfRegNum<[21]>;
111 def R20R19 : AVRReg<19, "r20:r19", [R19, R20]>, DwarfRegNum<[19]>;
112 def R18R17 : AVRReg<17, "r18:r17", [R17, R18]>, DwarfRegNum<[17]>;
113 def R16R15 : AVRReg<15, "r16:r15", [R15, R16]>, DwarfRegNum<[15]>;
114 def R14R13 : AVRReg<13, "r14:r13", [R13, R14]>, DwarfRegNum<[13]>;
115 def R12R11 : AVRReg<11, "r12:r11", [R11, R12]>, DwarfRegNum<[11]>;
116 def R10R9 : AVRReg<9, "r10:r9", [R9, R10]>, DwarfRegNum<[9]>;
119 //===----------------------------------------------------------------------===//
121 //===----------------------------------------------------------------------===//
123 // Main 8-bit register class.
124 def GPR8 : RegisterClass<"AVR", [i8], 8,
126 // Return value and argument registers.
127 add R24, R25, R18, R19, R20, R21, R22, R23,
128 // Scratch registers.
130 // Callee saved registers.
131 R28, R29, R17, R16, R15, R14, R13, R12, R11, R10,
132 R9, R8, R7, R6, R5, R4, R3, R2, R0, R1
135 // Simple lower registers r0..r15
136 def GPR8lo : RegisterClass<"AVR", [i8], 8,
138 add R15, R14, R13, R12, R11, R10, R9, R8, R7, R6, R5, R4, R3, R2, R0, R1
141 // 8-bit register class for instructions which take immediates.
142 def LD8 : RegisterClass<"AVR", [i8], 8,
144 // Return value and arguments.
145 add R24, R25, R18, R19, R20, R21, R22, R23,
146 // Scratch registers.
148 // Callee saved registers.
152 // Simple lower registers r16..r23
153 def LD8lo : RegisterClass<"AVR", [i8], 8,
155 add R23, R22, R21, R20, R19, R18, R17, R16
158 // Main 16-bit pair register class.
159 def DREGS : RegisterClass<"AVR", [i16], 8,
161 // Return value and arguments.
162 add R25R24, R19R18, R21R20, R23R22,
163 // Scratch registers.
165 // Callee saved registers.
166 R29R28, R17R16, R15R14, R13R12, R11R10,
167 R9R8, R7R6, R5R4, R3R2, R1R0,
168 // Pseudo regs for unaligned 16-bits
169 R26R25, R24R23, R22R21,
170 R20R19, R18R17, R16R15,
171 R14R13, R12R11, R10R9
174 // 16-bit pair register class for movw
175 def DREGSMOVW : RegisterClass<"AVR", [i16], 8,
177 // Return value and arguments.
178 add R25R24, R19R18, R21R20, R23R22,
179 // Scratch registers.
181 // Callee saved registers.
182 R29R28, R17R16, R15R14, R13R12, R11R10,
183 R9R8, R7R6, R5R4, R3R2, R1R0
186 // The 16-bit DREGS register class, excluding the Z pointer register.
188 // This is used by instructions which cause high pointer register
189 // contention which leads to an assertion in the register allocator.
191 // There is no technical reason why instructions that use this class
192 // cannot use Z; it's simply a workaround a regalloc bug.
194 // More information can be found in PR39553.
195 def DREGS_WITHOUT_YZ_WORKAROUND : RegisterClass<"AVR", [i16], 8,
197 // Return value and arguments.
198 add R25R24, R19R18, R21R20, R23R22,
199 // Scratch registers.
201 // Callee saved registers.
202 R17R16, R15R14, R13R12, R11R10,
203 R9R8, R7R6, R5R4, R3R2, R1R0
206 // 16-bit register class for immediate instructions.
207 def DLDREGS : RegisterClass<"AVR", [i16], 8,
209 // Return value and arguments.
210 add R25R24, R19R18, R21R20, R23R22,
211 // Scratch registers.
213 // Callee saved registers.
217 // 16-bit register class for the adiw/sbiw instructions.
218 def IWREGS : RegisterClass<"AVR", [i16], 8,
220 // Return value and arguments.
222 // Scratch registers.
224 // Callee saved registers.
228 // 16-bit register class for the ld and st instructions.
230 def PTRREGS : RegisterClass<"AVR", [i16], 8,
237 // 16-bit register class for the ldd and std instructions.
239 def PTRDISPREGS : RegisterClass<"AVR", [i16], 8,
244 // We have a bunch of instructions with an explicit Z register argument. We
245 // model this using a register class containing only the Z register.
246 def ZREG : RegisterClass<"AVR", [i16], 8, (add R31R30)>;
248 // Register class used for the stack read pseudo instruction.
249 def GPRSP: RegisterClass<"AVR", [i16], 8, (add SP)>;
252 def SREG : AVRReg<14, "FLAGS">, DwarfRegNum<[88]>;
253 def CCR : RegisterClass<"AVR", [i8], 8, (add SREG)>
255 let CopyCost = -1; // Don't allow copying of status registers