1 //===- ARMRegisterInfo.td - ARM Register defs --------------*- tablegen -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 //===----------------------------------------------------------------------===//
11 // Declarations that describe the ARM register file
12 //===----------------------------------------------------------------------===//
14 // Registers are identified with 4-bit ID numbers.
15 class ARMReg<bits<4> num, string n, list<Register> subregs = []> : Register<n> {
17 let Namespace = "ARM";
18 let SubRegs = subregs;
21 class ARMFReg<bits<6> num, string n> : Register<n> {
23 let Namespace = "ARM";
26 // Subregister indices.
27 let Namespace = "ARM" in {
28 // Note: Code depends on these having consecutive numbers.
29 def ssub_0 : SubRegIndex;
30 def ssub_1 : SubRegIndex;
31 def ssub_2 : SubRegIndex; // In a Q reg.
32 def ssub_3 : SubRegIndex;
34 def dsub_0 : SubRegIndex;
35 def dsub_1 : SubRegIndex;
36 def dsub_2 : SubRegIndex;
37 def dsub_3 : SubRegIndex;
38 def dsub_4 : SubRegIndex;
39 def dsub_5 : SubRegIndex;
40 def dsub_6 : SubRegIndex;
41 def dsub_7 : SubRegIndex;
43 def qsub_0 : SubRegIndex;
44 def qsub_1 : SubRegIndex;
45 def qsub_2 : SubRegIndex;
46 def qsub_3 : SubRegIndex;
48 def qqsub_0 : SubRegIndex;
49 def qqsub_1 : SubRegIndex;
53 def R0 : ARMReg< 0, "r0">, DwarfRegNum<[0]>;
54 def R1 : ARMReg< 1, "r1">, DwarfRegNum<[1]>;
55 def R2 : ARMReg< 2, "r2">, DwarfRegNum<[2]>;
56 def R3 : ARMReg< 3, "r3">, DwarfRegNum<[3]>;
57 def R4 : ARMReg< 4, "r4">, DwarfRegNum<[4]>;
58 def R5 : ARMReg< 5, "r5">, DwarfRegNum<[5]>;
59 def R6 : ARMReg< 6, "r6">, DwarfRegNum<[6]>;
60 def R7 : ARMReg< 7, "r7">, DwarfRegNum<[7]>;
61 // These require 32-bit instructions.
62 let CostPerUse = 1 in {
63 def R8 : ARMReg< 8, "r8">, DwarfRegNum<[8]>;
64 def R9 : ARMReg< 9, "r9">, DwarfRegNum<[9]>;
65 def R10 : ARMReg<10, "r10">, DwarfRegNum<[10]>;
66 def R11 : ARMReg<11, "r11">, DwarfRegNum<[11]>;
67 def R12 : ARMReg<12, "r12">, DwarfRegNum<[12]>;
68 def SP : ARMReg<13, "sp">, DwarfRegNum<[13]>;
69 def LR : ARMReg<14, "lr">, DwarfRegNum<[14]>;
70 def PC : ARMReg<15, "pc">, DwarfRegNum<[15]>;
74 def S0 : ARMFReg< 0, "s0">; def S1 : ARMFReg< 1, "s1">;
75 def S2 : ARMFReg< 2, "s2">; def S3 : ARMFReg< 3, "s3">;
76 def S4 : ARMFReg< 4, "s4">; def S5 : ARMFReg< 5, "s5">;
77 def S6 : ARMFReg< 6, "s6">; def S7 : ARMFReg< 7, "s7">;
78 def S8 : ARMFReg< 8, "s8">; def S9 : ARMFReg< 9, "s9">;
79 def S10 : ARMFReg<10, "s10">; def S11 : ARMFReg<11, "s11">;
80 def S12 : ARMFReg<12, "s12">; def S13 : ARMFReg<13, "s13">;
81 def S14 : ARMFReg<14, "s14">; def S15 : ARMFReg<15, "s15">;
82 def S16 : ARMFReg<16, "s16">; def S17 : ARMFReg<17, "s17">;
83 def S18 : ARMFReg<18, "s18">; def S19 : ARMFReg<19, "s19">;
84 def S20 : ARMFReg<20, "s20">; def S21 : ARMFReg<21, "s21">;
85 def S22 : ARMFReg<22, "s22">; def S23 : ARMFReg<23, "s23">;
86 def S24 : ARMFReg<24, "s24">; def S25 : ARMFReg<25, "s25">;
87 def S26 : ARMFReg<26, "s26">; def S27 : ARMFReg<27, "s27">;
88 def S28 : ARMFReg<28, "s28">; def S29 : ARMFReg<29, "s29">;
89 def S30 : ARMFReg<30, "s30">; def S31 : ARMFReg<31, "s31">;
91 // Aliases of the F* registers used to hold 64-bit fp values (doubles)
92 let SubRegIndices = [ssub_0, ssub_1] in {
93 def D0 : ARMReg< 0, "d0", [S0, S1]>, DwarfRegNum<[256]>;
94 def D1 : ARMReg< 1, "d1", [S2, S3]>, DwarfRegNum<[257]>;
95 def D2 : ARMReg< 2, "d2", [S4, S5]>, DwarfRegNum<[258]>;
96 def D3 : ARMReg< 3, "d3", [S6, S7]>, DwarfRegNum<[259]>;
97 def D4 : ARMReg< 4, "d4", [S8, S9]>, DwarfRegNum<[260]>;
98 def D5 : ARMReg< 5, "d5", [S10, S11]>, DwarfRegNum<[261]>;
99 def D6 : ARMReg< 6, "d6", [S12, S13]>, DwarfRegNum<[262]>;
100 def D7 : ARMReg< 7, "d7", [S14, S15]>, DwarfRegNum<[263]>;
101 def D8 : ARMReg< 8, "d8", [S16, S17]>, DwarfRegNum<[264]>;
102 def D9 : ARMReg< 9, "d9", [S18, S19]>, DwarfRegNum<[265]>;
103 def D10 : ARMReg<10, "d10", [S20, S21]>, DwarfRegNum<[266]>;
104 def D11 : ARMReg<11, "d11", [S22, S23]>, DwarfRegNum<[267]>;
105 def D12 : ARMReg<12, "d12", [S24, S25]>, DwarfRegNum<[268]>;
106 def D13 : ARMReg<13, "d13", [S26, S27]>, DwarfRegNum<[269]>;
107 def D14 : ARMReg<14, "d14", [S28, S29]>, DwarfRegNum<[270]>;
108 def D15 : ARMReg<15, "d15", [S30, S31]>, DwarfRegNum<[271]>;
111 // VFP3 defines 16 additional double registers
112 def D16 : ARMFReg<16, "d16">, DwarfRegNum<[272]>;
113 def D17 : ARMFReg<17, "d17">, DwarfRegNum<[273]>;
114 def D18 : ARMFReg<18, "d18">, DwarfRegNum<[274]>;
115 def D19 : ARMFReg<19, "d19">, DwarfRegNum<[275]>;
116 def D20 : ARMFReg<20, "d20">, DwarfRegNum<[276]>;
117 def D21 : ARMFReg<21, "d21">, DwarfRegNum<[277]>;
118 def D22 : ARMFReg<22, "d22">, DwarfRegNum<[278]>;
119 def D23 : ARMFReg<23, "d23">, DwarfRegNum<[279]>;
120 def D24 : ARMFReg<24, "d24">, DwarfRegNum<[280]>;
121 def D25 : ARMFReg<25, "d25">, DwarfRegNum<[281]>;
122 def D26 : ARMFReg<26, "d26">, DwarfRegNum<[282]>;
123 def D27 : ARMFReg<27, "d27">, DwarfRegNum<[283]>;
124 def D28 : ARMFReg<28, "d28">, DwarfRegNum<[284]>;
125 def D29 : ARMFReg<29, "d29">, DwarfRegNum<[285]>;
126 def D30 : ARMFReg<30, "d30">, DwarfRegNum<[286]>;
127 def D31 : ARMFReg<31, "d31">, DwarfRegNum<[287]>;
129 // Advanced SIMD (NEON) defines 16 quad-word aliases
130 let SubRegIndices = [dsub_0, dsub_1],
131 CompositeIndices = [(ssub_2 dsub_1, ssub_0),
132 (ssub_3 dsub_1, ssub_1)] in {
133 def Q0 : ARMReg< 0, "q0", [D0, D1]>;
134 def Q1 : ARMReg< 1, "q1", [D2, D3]>;
135 def Q2 : ARMReg< 2, "q2", [D4, D5]>;
136 def Q3 : ARMReg< 3, "q3", [D6, D7]>;
137 def Q4 : ARMReg< 4, "q4", [D8, D9]>;
138 def Q5 : ARMReg< 5, "q5", [D10, D11]>;
139 def Q6 : ARMReg< 6, "q6", [D12, D13]>;
140 def Q7 : ARMReg< 7, "q7", [D14, D15]>;
142 let SubRegIndices = [dsub_0, dsub_1] in {
143 def Q8 : ARMReg< 8, "q8", [D16, D17]>;
144 def Q9 : ARMReg< 9, "q9", [D18, D19]>;
145 def Q10 : ARMReg<10, "q10", [D20, D21]>;
146 def Q11 : ARMReg<11, "q11", [D22, D23]>;
147 def Q12 : ARMReg<12, "q12", [D24, D25]>;
148 def Q13 : ARMReg<13, "q13", [D26, D27]>;
149 def Q14 : ARMReg<14, "q14", [D28, D29]>;
150 def Q15 : ARMReg<15, "q15", [D30, D31]>;
153 // Pseudo 256-bit registers to represent pairs of Q registers. These should
154 // never be present in the emitted code.
155 // These are used for NEON load / store instructions, e.g., vld4, vst3.
156 // NOTE: It's possible to define more QQ registers since technically the
157 // starting D register number doesn't have to be multiple of 4, e.g.,
158 // D1, D2, D3, D4 would be a legal quad, but that would make the subregister
160 let SubRegIndices = [qsub_0, qsub_1],
161 CompositeIndices = [(dsub_2 qsub_1, dsub_0), (dsub_3 qsub_1, dsub_1)] in {
162 def QQ0 : ARMReg<0, "qq0", [Q0, Q1]>;
163 def QQ1 : ARMReg<1, "qq1", [Q2, Q3]>;
164 def QQ2 : ARMReg<2, "qq2", [Q4, Q5]>;
165 def QQ3 : ARMReg<3, "qq3", [Q6, Q7]>;
166 def QQ4 : ARMReg<4, "qq4", [Q8, Q9]>;
167 def QQ5 : ARMReg<5, "qq5", [Q10, Q11]>;
168 def QQ6 : ARMReg<6, "qq6", [Q12, Q13]>;
169 def QQ7 : ARMReg<7, "qq7", [Q14, Q15]>;
172 // Pseudo 512-bit registers to represent four consecutive Q registers.
173 let SubRegIndices = [qqsub_0, qqsub_1],
174 CompositeIndices = [(qsub_2 qqsub_1, qsub_0), (qsub_3 qqsub_1, qsub_1),
175 (dsub_4 qqsub_1, dsub_0), (dsub_5 qqsub_1, dsub_1),
176 (dsub_6 qqsub_1, dsub_2), (dsub_7 qqsub_1, dsub_3)] in {
177 def QQQQ0 : ARMReg<0, "qqqq0", [QQ0, QQ1]>;
178 def QQQQ1 : ARMReg<1, "qqqq1", [QQ2, QQ3]>;
179 def QQQQ2 : ARMReg<2, "qqqq2", [QQ4, QQ5]>;
180 def QQQQ3 : ARMReg<3, "qqqq3", [QQ6, QQ7]>;
183 // Current Program Status Register.
184 def CPSR : ARMReg<0, "cpsr">;
185 def FPSCR : ARMReg<1, "fpscr">;
186 def ITSTATE : ARMReg<2, "itstate">;
188 // Special Registers - only available in privileged mode.
189 def FPSID : ARMReg<0, "fpsid">;
190 def FPEXC : ARMReg<8, "fpexc">;
194 // pc == Program Counter
195 // lr == Link Register
196 // sp == Stack Pointer
197 // r12 == ip (scratch)
198 // r7 == Frame Pointer (thumb-style backtraces)
199 // r9 == May be reserved as Thread Register
200 // r11 == Frame Pointer (arm-style backtraces)
201 // r10 == Stack Limit
203 def GPR : RegisterClass<"ARM", [i32], 32, (add (sequence "R%u", 0, 12),
205 let MethodProtos = [{
206 iterator allocation_order_begin(const MachineFunction &MF) const;
207 iterator allocation_order_end(const MachineFunction &MF) const;
209 let MethodBodies = [{
210 static const unsigned ARM_GPR_AO[] = {
211 ARM::R0, ARM::R1, ARM::R2, ARM::R3,
213 ARM::R4, ARM::R5, ARM::R6, ARM::R7,
214 ARM::R8, ARM::R9, ARM::R10, ARM::R11 };
216 // For Thumb1 mode, we don't want to allocate hi regs at all, as we
217 // don't know how to spill them. If we make our prologue/epilogue code
218 // smarter at some point, we can go back to using the above allocation
219 // orders for the Thumb1 instructions that know how to use hi regs.
220 static const unsigned THUMB_GPR_AO[] = {
221 ARM::R0, ARM::R1, ARM::R2, ARM::R3,
222 ARM::R4, ARM::R5, ARM::R6, ARM::R7 };
225 GPRClass::allocation_order_begin(const MachineFunction &MF) const {
226 const TargetMachine &TM = MF.getTarget();
227 const ARMSubtarget &Subtarget = TM.getSubtarget<ARMSubtarget>();
228 if (Subtarget.isThumb1Only())
234 GPRClass::allocation_order_end(const MachineFunction &MF) const {
235 const TargetMachine &TM = MF.getTarget();
236 const ARMSubtarget &Subtarget = TM.getSubtarget<ARMSubtarget>();
237 if (Subtarget.isThumb1Only())
238 return THUMB_GPR_AO + (sizeof(THUMB_GPR_AO)/sizeof(unsigned));
239 return ARM_GPR_AO + (sizeof(ARM_GPR_AO)/sizeof(unsigned));
244 // restricted GPR register class. Many Thumb2 instructions allow the full
245 // register range for operands, but have undefined behaviours when PC
246 // or SP (R13 or R15) are used. The ARM ISA refers to these operands
247 // via the BadReg() pseudo-code description.
248 def rGPR : RegisterClass<"ARM", [i32], 32, (sub GPR, SP, PC)> {
249 let MethodProtos = [{
250 iterator allocation_order_begin(const MachineFunction &MF) const;
251 iterator allocation_order_end(const MachineFunction &MF) const;
253 let MethodBodies = [{
254 static const unsigned ARM_rGPR_AO[] = {
255 ARM::R0, ARM::R1, ARM::R2, ARM::R3,
257 ARM::R4, ARM::R5, ARM::R6, ARM::R7,
258 ARM::R8, ARM::R9, ARM::R10,
261 // For Thumb1 mode, we don't want to allocate hi regs at all, as we
262 // don't know how to spill them. If we make our prologue/epilogue code
263 // smarter at some point, we can go back to using the above allocation
264 // orders for the Thumb1 instructions that know how to use hi regs.
265 static const unsigned THUMB_rGPR_AO[] = {
266 ARM::R0, ARM::R1, ARM::R2, ARM::R3,
267 ARM::R4, ARM::R5, ARM::R6, ARM::R7 };
270 rGPRClass::allocation_order_begin(const MachineFunction &MF) const {
271 const TargetMachine &TM = MF.getTarget();
272 const ARMSubtarget &Subtarget = TM.getSubtarget<ARMSubtarget>();
273 if (Subtarget.isThumb1Only())
274 return THUMB_rGPR_AO;
279 rGPRClass::allocation_order_end(const MachineFunction &MF) const {
280 const TargetMachine &TM = MF.getTarget();
281 const ARMSubtarget &Subtarget = TM.getSubtarget<ARMSubtarget>();
283 if (Subtarget.isThumb1Only())
284 return THUMB_rGPR_AO + (sizeof(THUMB_rGPR_AO)/sizeof(unsigned));
285 return ARM_rGPR_AO + (sizeof(ARM_rGPR_AO)/sizeof(unsigned));
290 // Thumb registers are R0-R7 normally. Some instructions can still use
291 // the general GPR register class above (MOV, e.g.)
292 def tGPR : RegisterClass<"ARM", [i32], 32, (trunc GPR, 8)>;
294 // For tail calls, we can't use callee-saved registers, as they are restored
295 // to the saved value before the tail call, which would clobber a call address.
296 // Note, getMinimalPhysRegClass(R0) returns tGPR because of the names of
297 // this class and the preceding one(!) This is what we want.
298 def tcGPR : RegisterClass<"ARM", [i32], 32, (add R0, R1, R2, R3, R9, R12)> {
299 let MethodProtos = [{
300 iterator allocation_order_begin(const MachineFunction &MF) const;
301 iterator allocation_order_end(const MachineFunction &MF) const;
303 let MethodBodies = [{
305 static const unsigned ARM_GPR_R9_TC[] = {
306 ARM::R0, ARM::R1, ARM::R2, ARM::R3,
308 // R9 is not available.
309 static const unsigned ARM_GPR_NOR9_TC[] = {
310 ARM::R0, ARM::R1, ARM::R2, ARM::R3,
313 // For Thumb1 mode, we don't want to allocate hi regs at all, as we
314 // don't know how to spill them. If we make our prologue/epilogue code
315 // smarter at some point, we can go back to using the above allocation
316 // orders for the Thumb1 instructions that know how to use hi regs.
317 static const unsigned THUMB_GPR_AO_TC[] = {
318 ARM::R0, ARM::R1, ARM::R2, ARM::R3 };
321 tcGPRClass::allocation_order_begin(const MachineFunction &MF) const {
322 const TargetMachine &TM = MF.getTarget();
323 const ARMSubtarget &Subtarget = TM.getSubtarget<ARMSubtarget>();
324 if (Subtarget.isThumb1Only())
325 return THUMB_GPR_AO_TC;
326 return Subtarget.isTargetDarwin() ? ARM_GPR_R9_TC : ARM_GPR_NOR9_TC;
330 tcGPRClass::allocation_order_end(const MachineFunction &MF) const {
331 const TargetMachine &TM = MF.getTarget();
332 const ARMSubtarget &Subtarget = TM.getSubtarget<ARMSubtarget>();
334 if (Subtarget.isThumb1Only())
335 return THUMB_GPR_AO_TC + (sizeof(THUMB_GPR_AO_TC)/sizeof(unsigned));
337 return Subtarget.isTargetDarwin() ?
338 ARM_GPR_R9_TC + (sizeof(ARM_GPR_R9_TC)/sizeof(unsigned)) :
339 ARM_GPR_NOR9_TC + (sizeof(ARM_GPR_NOR9_TC)/sizeof(unsigned));
345 // Scalar single precision floating point register class..
346 def SPR : RegisterClass<"ARM", [f32], 32, (sequence "S%u", 0, 31)>;
348 // Subset of SPR which can be used as a source of NEON scalars for 16-bit
350 def SPR_8 : RegisterClass<"ARM", [f32], 32, (trunc SPR, 16)>;
352 // Scalar double precision floating point / generic 64-bit vector register
354 // ARM requires only word alignment for double. It's more performant if it
355 // is double-word alignment though.
356 def DPR : RegisterClass<"ARM", [f64, v8i8, v4i16, v2i32, v1i64, v2f32], 64,
357 (sequence "D%u", 0, 31)> {
358 let MethodProtos = [{
359 iterator allocation_order_begin(const MachineFunction &MF) const;
360 iterator allocation_order_end(const MachineFunction &MF) const;
362 let MethodBodies = [{
364 static const unsigned ARM_DPR_VFP2[] = {
365 ARM::D0, ARM::D1, ARM::D2, ARM::D3,
366 ARM::D4, ARM::D5, ARM::D6, ARM::D7,
367 ARM::D8, ARM::D9, ARM::D10, ARM::D11,
368 ARM::D12, ARM::D13, ARM::D14, ARM::D15 };
369 // VFP3: D8-D15 are callee saved and should be allocated last.
370 // Save other low registers for use as DPR_VFP2 and DPR_8 classes.
371 static const unsigned ARM_DPR_VFP3[] = {
372 ARM::D16, ARM::D17, ARM::D18, ARM::D19,
373 ARM::D20, ARM::D21, ARM::D22, ARM::D23,
374 ARM::D24, ARM::D25, ARM::D26, ARM::D27,
375 ARM::D28, ARM::D29, ARM::D30, ARM::D31,
376 ARM::D0, ARM::D1, ARM::D2, ARM::D3,
377 ARM::D4, ARM::D5, ARM::D6, ARM::D7,
378 ARM::D8, ARM::D9, ARM::D10, ARM::D11,
379 ARM::D12, ARM::D13, ARM::D14, ARM::D15 };
382 DPRClass::allocation_order_begin(const MachineFunction &MF) const {
383 const TargetMachine &TM = MF.getTarget();
384 const ARMSubtarget &Subtarget = TM.getSubtarget<ARMSubtarget>();
385 if (Subtarget.hasVFP3() && !Subtarget.hasD16())
391 DPRClass::allocation_order_end(const MachineFunction &MF) const {
392 const TargetMachine &TM = MF.getTarget();
393 const ARMSubtarget &Subtarget = TM.getSubtarget<ARMSubtarget>();
394 if (Subtarget.hasVFP3() && !Subtarget.hasD16())
395 return ARM_DPR_VFP3 + (sizeof(ARM_DPR_VFP3)/sizeof(unsigned));
397 return ARM_DPR_VFP2 + (sizeof(ARM_DPR_VFP2)/sizeof(unsigned));
402 // Subset of DPR that are accessible with VFP2 (and so that also have
403 // 32-bit SPR subregs).
404 def DPR_VFP2 : RegisterClass<"ARM", [f64, v8i8, v4i16, v2i32, v1i64, v2f32], 64,
406 let SubRegClasses = [(SPR ssub_0, ssub_1)];
409 // Subset of DPR which can be used as a source of NEON scalars for 16-bit
411 def DPR_8 : RegisterClass<"ARM", [f64, v8i8, v4i16, v2i32, v1i64, v2f32], 64,
413 let SubRegClasses = [(SPR_8 ssub_0, ssub_1)];
416 // Generic 128-bit vector register class.
417 def QPR : RegisterClass<"ARM", [v16i8, v8i16, v4i32, v2i64, v4f32, v2f64], 128,
418 (sequence "Q%u", 0, 15)> {
419 let SubRegClasses = [(DPR dsub_0, dsub_1)];
420 let MethodProtos = [{
421 iterator allocation_order_begin(const MachineFunction &MF) const;
422 iterator allocation_order_end(const MachineFunction &MF) const;
424 let MethodBodies = [{
425 // Q4-Q7 are callee saved and should be allocated last.
426 // Save other low registers for use as QPR_VFP2 and QPR_8 classes.
427 static const unsigned ARM_QPR[] = {
428 ARM::Q8, ARM::Q9, ARM::Q10, ARM::Q11,
429 ARM::Q12, ARM::Q13, ARM::Q14, ARM::Q15,
430 ARM::Q0, ARM::Q1, ARM::Q2, ARM::Q3,
431 ARM::Q4, ARM::Q5, ARM::Q6, ARM::Q7 };
434 QPRClass::allocation_order_begin(const MachineFunction &MF) const {
439 QPRClass::allocation_order_end(const MachineFunction &MF) const {
440 return ARM_QPR + (sizeof(ARM_QPR)/sizeof(unsigned));
445 // Subset of QPR that have 32-bit SPR subregs.
446 def QPR_VFP2 : RegisterClass<"ARM", [v16i8, v8i16, v4i32, v2i64, v4f32, v2f64],
447 128, (trunc QPR, 8)> {
448 let SubRegClasses = [(SPR ssub_0, ssub_1, ssub_2, ssub_3),
449 (DPR_VFP2 dsub_0, dsub_1)];
452 // Subset of QPR that have DPR_8 and SPR_8 subregs.
453 def QPR_8 : RegisterClass<"ARM", [v16i8, v8i16, v4i32, v2i64, v4f32, v2f64],
454 128, (trunc QPR, 4)> {
455 let SubRegClasses = [(SPR_8 ssub_0, ssub_1, ssub_2, ssub_3),
456 (DPR_8 dsub_0, dsub_1)];
459 // Pseudo 256-bit vector register class to model pairs of Q registers
460 // (4 consecutive D registers).
461 def QQPR : RegisterClass<"ARM", [v4i64], 256, (sequence "QQ%u", 0, 7)> {
462 let SubRegClasses = [(DPR dsub_0, dsub_1, dsub_2, dsub_3),
463 (QPR qsub_0, qsub_1)];
464 let MethodProtos = [{
465 iterator allocation_order_begin(const MachineFunction &MF) const;
466 iterator allocation_order_end(const MachineFunction &MF) const;
468 let MethodBodies = [{
469 // QQ2-QQ3 are callee saved and should be allocated last.
470 // Save other low registers for use as QPR_VFP2 and QPR_8 classes.
471 static const unsigned ARM_QQPR[] = {
472 ARM::QQ4, ARM::QQ5, ARM::QQ6, ARM::QQ7,
473 ARM::QQ0, ARM::QQ1, ARM::QQ2, ARM::QQ3 };
476 QQPRClass::allocation_order_begin(const MachineFunction &MF) const {
481 QQPRClass::allocation_order_end(const MachineFunction &MF) const {
482 return ARM_QQPR + (sizeof(ARM_QQPR)/sizeof(unsigned));
487 // Subset of QQPR that have 32-bit SPR subregs.
488 def QQPR_VFP2 : RegisterClass<"ARM", [v4i64], 256, (trunc QQPR, 4)> {
489 let SubRegClasses = [(SPR ssub_0, ssub_1, ssub_2, ssub_3),
490 (DPR_VFP2 dsub_0, dsub_1, dsub_2, dsub_3),
491 (QPR_VFP2 qsub_0, qsub_1)];
495 // Pseudo 512-bit vector register class to model 4 consecutive Q registers
496 // (8 consecutive D registers).
497 def QQQQPR : RegisterClass<"ARM", [v8i64], 256, (sequence "QQQQ%u", 0, 3)> {
498 let SubRegClasses = [(DPR dsub_0, dsub_1, dsub_2, dsub_3,
499 dsub_4, dsub_5, dsub_6, dsub_7),
500 (QPR qsub_0, qsub_1, qsub_2, qsub_3)];
501 let MethodProtos = [{
502 iterator allocation_order_begin(const MachineFunction &MF) const;
503 iterator allocation_order_end(const MachineFunction &MF) const;
505 let MethodBodies = [{
506 // QQQQ1 is callee saved and should be allocated last.
507 // Save QQQQ0 for use as QPR_VFP2 and QPR_8 classes.
508 static const unsigned ARM_QQQQPR[] = {
509 ARM::QQQQ2, ARM::QQQQ3, ARM::QQQQ0, ARM::QQQQ1 };
511 QQQQPRClass::iterator
512 QQQQPRClass::allocation_order_begin(const MachineFunction &MF) const {
516 QQQQPRClass::iterator
517 QQQQPRClass::allocation_order_end(const MachineFunction &MF) const {
518 return ARM_QQQQPR + (sizeof(ARM_QQQQPR)/sizeof(unsigned));
523 // Condition code registers.
524 def CCR : RegisterClass<"ARM", [i32], 32, (add CPSR)> {
525 let isAllocatable = 0;