operands.isa (9251:5d0fcec59036) operands.isa (10037:5cac77888310)
1// -*- mode:c++ -*-
1// -*- mode:c++ -*-
2// Copyright (c) 2010 ARM Limited
2// Copyright (c) 2010-2013 ARM Limited
3// All rights reserved
4//
5// The license below extends only to copyright in the software and shall
6// not be construed as granting a license to any other intellectual
7// property including but not limited to intellectual property relating
8// to a hardware implementation of the functionality of the software
9// licensed hereunder. You may use the software subject to the license
10// terms below provided that you ensure that this notice is replicated

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75 setNextPC(xc, %(final_val)s);
76 } else {
77 setIWNextPC(xc, %(final_val)s);
78 }
79 } else {
80 xc->%(func)s(this, %(op_idx)s, %(final_val)s);
81 }
82 '''
3// All rights reserved
4//
5// The license below extends only to copyright in the software and shall
6// not be construed as granting a license to any other intellectual
7// property including but not limited to intellectual property relating
8// to a hardware implementation of the functionality of the software
9// licensed hereunder. You may use the software subject to the license
10// terms below provided that you ensure that this notice is replicated

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75 setNextPC(xc, %(final_val)s);
76 } else {
77 setIWNextPC(xc, %(final_val)s);
78 }
79 } else {
80 xc->%(func)s(this, %(op_idx)s, %(final_val)s);
81 }
82 '''
83 aarch64Read = '''
84 ((xc->%(func)s(this, %(op_idx)s)) & mask(intWidth))
85 '''
86 aarch64Write = '''
87 xc->%(func)s(this, %(op_idx)s, (%(final_val)s) & mask(intWidth))
88 '''
89 aarchX64Read = '''
90 ((xc->%(func)s(this, %(op_idx)s)) & mask(aarch64 ? 64 : 32))
91 '''
92 aarchX64Write = '''
93 xc->%(func)s(this, %(op_idx)s, (%(final_val)s) & mask(aarch64 ? 64 : 32))
94 '''
95 aarchW64Read = '''
96 ((xc->%(func)s(this, %(op_idx)s)) & mask(32))
97 '''
98 aarchW64Write = '''
99 xc->%(func)s(this, %(op_idx)s, (%(final_val)s) & mask(32))
100 '''
101 cntrlNsBankedWrite = '''
102 xc->setMiscReg(flattenMiscRegNsBanked(dest, xc->tcBase()), %(final_val)s)
103 '''
83
104
105 cntrlNsBankedRead = '''
106 xc->readMiscReg(flattenMiscRegNsBanked(op1, xc->tcBase()))
107 '''
108
84 #PCState operands need to have a sorting index (the number at the end)
85 #less than all the integer registers which might update the PC. That way
86 #if the flag bits of the pc state are updated and a branch happens through
87 #R15, the updates are layered properly and the R15 update isn't lost.
88 srtNormal = 5
89 srtCpsr = 4
90 srtBase = 3
91 srtPC = 2
92 srtMode = 1
93 srtEPC = 0
94
95 def floatReg(idx):
96 return ('FloatReg', 'sf', idx, 'IsFloating', srtNormal)
97
98 def intReg(idx):
99 return ('IntReg', 'uw', idx, 'IsInteger', srtNormal,
100 maybePCRead, maybePCWrite)
101
109 #PCState operands need to have a sorting index (the number at the end)
110 #less than all the integer registers which might update the PC. That way
111 #if the flag bits of the pc state are updated and a branch happens through
112 #R15, the updates are layered properly and the R15 update isn't lost.
113 srtNormal = 5
114 srtCpsr = 4
115 srtBase = 3
116 srtPC = 2
117 srtMode = 1
118 srtEPC = 0
119
120 def floatReg(idx):
121 return ('FloatReg', 'sf', idx, 'IsFloating', srtNormal)
122
123 def intReg(idx):
124 return ('IntReg', 'uw', idx, 'IsInteger', srtNormal,
125 maybePCRead, maybePCWrite)
126
127 def intReg64(idx):
128 return ('IntReg', 'ud', idx, 'IsInteger', srtNormal,
129 aarch64Read, aarch64Write)
130
131 def intRegX64(idx, id = srtNormal):
132 return ('IntReg', 'ud', idx, 'IsInteger', id,
133 aarchX64Read, aarchX64Write)
134
135 def intRegW64(idx, id = srtNormal):
136 return ('IntReg', 'ud', idx, 'IsInteger', id,
137 aarchW64Read, aarchW64Write)
138
102 def intRegNPC(idx):
103 return ('IntReg', 'uw', idx, 'IsInteger', srtNormal)
104
105 def intRegAPC(idx, id = srtNormal):
106 return ('IntReg', 'uw', idx, 'IsInteger', id,
107 maybeAlignedPCRead, maybePCWrite)
108
109 def intRegIWPC(idx):

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115 maybePCRead, maybeAIWPCWrite)
116
117 def intRegCC(idx):
118 return ('IntReg', 'uw', idx, None, srtNormal)
119
120 def cntrlReg(idx, id = srtNormal, type = 'uw'):
121 return ('ControlReg', type, idx, None, id)
122
139 def intRegNPC(idx):
140 return ('IntReg', 'uw', idx, 'IsInteger', srtNormal)
141
142 def intRegAPC(idx, id = srtNormal):
143 return ('IntReg', 'uw', idx, 'IsInteger', id,
144 maybeAlignedPCRead, maybePCWrite)
145
146 def intRegIWPC(idx):

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152 maybePCRead, maybeAIWPCWrite)
153
154 def intRegCC(idx):
155 return ('IntReg', 'uw', idx, None, srtNormal)
156
157 def cntrlReg(idx, id = srtNormal, type = 'uw'):
158 return ('ControlReg', type, idx, None, id)
159
160 def cntrlNsBankedReg(idx, id = srtNormal, type = 'uw'):
161 return ('ControlReg', type, idx, (None, None, 'IsControl'), id, cntrlNsBankedRead, cntrlNsBankedWrite)
162
163 def cntrlNsBankedReg64(idx, id = srtNormal, type = 'ud'):
164 return ('ControlReg', type, idx, (None, None, 'IsControl'), id, cntrlNsBankedRead, cntrlNsBankedWrite)
165
123 def cntrlRegNC(idx, id = srtNormal, type = 'uw'):
124 return ('ControlReg', type, idx, None, id)
125
126 def pcStateReg(idx, id):
166 def cntrlRegNC(idx, id = srtNormal, type = 'uw'):
167 return ('ControlReg', type, idx, None, id)
168
169 def pcStateReg(idx, id):
127 return ('PCState', 'uw', idx, (None, None, 'IsControl'), id)
170 return ('PCState', 'ud', idx, (None, None, 'IsControl'), id)
128}};
129
130def operands {{
131 #Abstracted integer reg operands
132 'Dest': intReg('dest'),
171}};
172
173def operands {{
174 #Abstracted integer reg operands
175 'Dest': intReg('dest'),
176 'Dest64': intReg64('dest'),
177 'XDest': intRegX64('dest'),
178 'WDest': intRegW64('dest'),
133 'IWDest': intRegIWPC('dest'),
134 'AIWDest': intRegAIWPC('dest'),
135 'Dest2': intReg('dest2'),
179 'IWDest': intRegIWPC('dest'),
180 'AIWDest': intRegAIWPC('dest'),
181 'Dest2': intReg('dest2'),
182 'XDest2': intRegX64('dest2'),
183 'FDest2': floatReg('dest2'),
136 'Result': intReg('result'),
184 'Result': intReg('result'),
185 'XResult': intRegX64('result'),
186 'XBase': intRegX64('base', id = srtBase),
137 'Base': intRegAPC('base', id = srtBase),
187 'Base': intRegAPC('base', id = srtBase),
188 'XOffset': intRegX64('offset'),
138 'Index': intReg('index'),
139 'Shift': intReg('shift'),
140 'Op1': intReg('op1'),
141 'Op2': intReg('op2'),
142 'Op3': intReg('op3'),
189 'Index': intReg('index'),
190 'Shift': intReg('shift'),
191 'Op1': intReg('op1'),
192 'Op2': intReg('op2'),
193 'Op3': intReg('op3'),
194 'Op164': intReg64('op1'),
195 'Op264': intReg64('op2'),
196 'Op364': intReg64('op3'),
197 'XOp1': intRegX64('op1'),
198 'XOp2': intRegX64('op2'),
199 'XOp3': intRegX64('op3'),
200 'WOp1': intRegW64('op1'),
201 'WOp2': intRegW64('op2'),
202 'WOp3': intRegW64('op3'),
143 'Reg0': intReg('reg0'),
144 'Reg1': intReg('reg1'),
145 'Reg2': intReg('reg2'),
146 'Reg3': intReg('reg3'),
147
148 #Fixed index integer reg operands
149 'SpMode': intRegNPC('intRegInMode((OperatingMode)regMode, INTREG_SP)'),
203 'Reg0': intReg('reg0'),
204 'Reg1': intReg('reg1'),
205 'Reg2': intReg('reg2'),
206 'Reg3': intReg('reg3'),
207
208 #Fixed index integer reg operands
209 'SpMode': intRegNPC('intRegInMode((OperatingMode)regMode, INTREG_SP)'),
210 'DecodedBankedIntReg': intRegNPC('decodeMrsMsrBankedIntRegIndex(byteMask, r)'),
150 'LR': intRegNPC('INTREG_LR'),
211 'LR': intRegNPC('INTREG_LR'),
212 'XLR': intRegX64('INTREG_X30'),
151 'R7': intRegNPC('7'),
152 # First four arguments are passed in registers
153 'R0': intRegNPC('0'),
154 'R1': intRegNPC('1'),
155 'R2': intRegNPC('2'),
156 'R3': intRegNPC('3'),
213 'R7': intRegNPC('7'),
214 # First four arguments are passed in registers
215 'R0': intRegNPC('0'),
216 'R1': intRegNPC('1'),
217 'R2': intRegNPC('2'),
218 'R3': intRegNPC('3'),
219 'X0': intRegX64('0'),
220 'X1': intRegX64('1'),
221 'X2': intRegX64('2'),
222 'X3': intRegX64('3'),
157
158 #Pseudo integer condition code registers
159 'CondCodesNZ': intRegCC('INTREG_CONDCODES_NZ'),
160 'CondCodesC': intRegCC('INTREG_CONDCODES_C'),
161 'CondCodesV': intRegCC('INTREG_CONDCODES_V'),
162 'CondCodesGE': intRegCC('INTREG_CONDCODES_GE'),
163 'OptCondCodesNZ': intRegCC(
164 '''(condCode == COND_AL || condCode == COND_UC ||

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225 'FpOp1S3P1': floatReg('(op1 + step * 3 + 1)'),
226
227 'FpOp2': floatReg('(op2 + 0)'),
228 'FpOp2P0': floatReg('(op2 + 0)'),
229 'FpOp2P1': floatReg('(op2 + 1)'),
230 'FpOp2P2': floatReg('(op2 + 2)'),
231 'FpOp2P3': floatReg('(op2 + 3)'),
232
223
224 #Pseudo integer condition code registers
225 'CondCodesNZ': intRegCC('INTREG_CONDCODES_NZ'),
226 'CondCodesC': intRegCC('INTREG_CONDCODES_C'),
227 'CondCodesV': intRegCC('INTREG_CONDCODES_V'),
228 'CondCodesGE': intRegCC('INTREG_CONDCODES_GE'),
229 'OptCondCodesNZ': intRegCC(
230 '''(condCode == COND_AL || condCode == COND_UC ||

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291 'FpOp1S3P1': floatReg('(op1 + step * 3 + 1)'),
292
293 'FpOp2': floatReg('(op2 + 0)'),
294 'FpOp2P0': floatReg('(op2 + 0)'),
295 'FpOp2P1': floatReg('(op2 + 1)'),
296 'FpOp2P2': floatReg('(op2 + 2)'),
297 'FpOp2P3': floatReg('(op2 + 3)'),
298
299 # Create AArch64 unpacked view of the FP registers
300 'AA64FpOp1P0': floatReg('((op1 * 4) + 0)'),
301 'AA64FpOp1P1': floatReg('((op1 * 4) + 1)'),
302 'AA64FpOp1P2': floatReg('((op1 * 4) + 2)'),
303 'AA64FpOp1P3': floatReg('((op1 * 4) + 3)'),
304 'AA64FpOp2P0': floatReg('((op2 * 4) + 0)'),
305 'AA64FpOp2P1': floatReg('((op2 * 4) + 1)'),
306 'AA64FpOp2P2': floatReg('((op2 * 4) + 2)'),
307 'AA64FpOp2P3': floatReg('((op2 * 4) + 3)'),
308 'AA64FpOp3P0': floatReg('((op3 * 4) + 0)'),
309 'AA64FpOp3P1': floatReg('((op3 * 4) + 1)'),
310 'AA64FpOp3P2': floatReg('((op3 * 4) + 2)'),
311 'AA64FpOp3P3': floatReg('((op3 * 4) + 3)'),
312 'AA64FpDestP0': floatReg('((dest * 4) + 0)'),
313 'AA64FpDestP1': floatReg('((dest * 4) + 1)'),
314 'AA64FpDestP2': floatReg('((dest * 4) + 2)'),
315 'AA64FpDestP3': floatReg('((dest * 4) + 3)'),
316 'AA64FpDest2P0': floatReg('((dest2 * 4) + 0)'),
317 'AA64FpDest2P1': floatReg('((dest2 * 4) + 1)'),
318 'AA64FpDest2P2': floatReg('((dest2 * 4) + 2)'),
319 'AA64FpDest2P3': floatReg('((dest2 * 4) + 3)'),
320
321 'AA64FpOp1P0V0': floatReg('((((op1+0)) * 4) + 0)'),
322 'AA64FpOp1P1V0': floatReg('((((op1+0)) * 4) + 1)'),
323 'AA64FpOp1P2V0': floatReg('((((op1+0)) * 4) + 2)'),
324 'AA64FpOp1P3V0': floatReg('((((op1+0)) * 4) + 3)'),
325
326 'AA64FpOp1P0V1': floatReg('((((op1+1)) * 4) + 0)'),
327 'AA64FpOp1P1V1': floatReg('((((op1+1)) * 4) + 1)'),
328 'AA64FpOp1P2V1': floatReg('((((op1+1)) * 4) + 2)'),
329 'AA64FpOp1P3V1': floatReg('((((op1+1)) * 4) + 3)'),
330
331 'AA64FpOp1P0V2': floatReg('((((op1+2)) * 4) + 0)'),
332 'AA64FpOp1P1V2': floatReg('((((op1+2)) * 4) + 1)'),
333 'AA64FpOp1P2V2': floatReg('((((op1+2)) * 4) + 2)'),
334 'AA64FpOp1P3V2': floatReg('((((op1+2)) * 4) + 3)'),
335
336 'AA64FpOp1P0V3': floatReg('((((op1+3)) * 4) + 0)'),
337 'AA64FpOp1P1V3': floatReg('((((op1+3)) * 4) + 1)'),
338 'AA64FpOp1P2V3': floatReg('((((op1+3)) * 4) + 2)'),
339 'AA64FpOp1P3V3': floatReg('((((op1+3)) * 4) + 3)'),
340
341 'AA64FpOp1P0V0S': floatReg('((((op1+0)%32) * 4) + 0)'),
342 'AA64FpOp1P1V0S': floatReg('((((op1+0)%32) * 4) + 1)'),
343 'AA64FpOp1P2V0S': floatReg('((((op1+0)%32) * 4) + 2)'),
344 'AA64FpOp1P3V0S': floatReg('((((op1+0)%32) * 4) + 3)'),
345
346 'AA64FpOp1P0V1S': floatReg('((((op1+1)%32) * 4) + 0)'),
347 'AA64FpOp1P1V1S': floatReg('((((op1+1)%32) * 4) + 1)'),
348 'AA64FpOp1P2V1S': floatReg('((((op1+1)%32) * 4) + 2)'),
349 'AA64FpOp1P3V1S': floatReg('((((op1+1)%32) * 4) + 3)'),
350
351 'AA64FpOp1P0V2S': floatReg('((((op1+2)%32) * 4) + 0)'),
352 'AA64FpOp1P1V2S': floatReg('((((op1+2)%32) * 4) + 1)'),
353 'AA64FpOp1P2V2S': floatReg('((((op1+2)%32) * 4) + 2)'),
354 'AA64FpOp1P3V2S': floatReg('((((op1+2)%32) * 4) + 3)'),
355
356 'AA64FpOp1P0V3S': floatReg('((((op1+3)%32) * 4) + 0)'),
357 'AA64FpOp1P1V3S': floatReg('((((op1+3)%32) * 4) + 1)'),
358 'AA64FpOp1P2V3S': floatReg('((((op1+3)%32) * 4) + 2)'),
359 'AA64FpOp1P3V3S': floatReg('((((op1+3)%32) * 4) + 3)'),
360
361 'AA64FpDestP0V0': floatReg('((((dest+0)) * 4) + 0)'),
362 'AA64FpDestP1V0': floatReg('((((dest+0)) * 4) + 1)'),
363 'AA64FpDestP2V0': floatReg('((((dest+0)) * 4) + 2)'),
364 'AA64FpDestP3V0': floatReg('((((dest+0)) * 4) + 3)'),
365
366 'AA64FpDestP0V1': floatReg('((((dest+1)) * 4) + 0)'),
367 'AA64FpDestP1V1': floatReg('((((dest+1)) * 4) + 1)'),
368 'AA64FpDestP2V1': floatReg('((((dest+1)) * 4) + 2)'),
369 'AA64FpDestP3V1': floatReg('((((dest+1)) * 4) + 3)'),
370
371 'AA64FpDestP0V0L': floatReg('((((dest+0)%32) * 4) + 0)'),
372 'AA64FpDestP1V0L': floatReg('((((dest+0)%32) * 4) + 1)'),
373 'AA64FpDestP2V0L': floatReg('((((dest+0)%32) * 4) + 2)'),
374 'AA64FpDestP3V0L': floatReg('((((dest+0)%32) * 4) + 3)'),
375
376 'AA64FpDestP0V1L': floatReg('((((dest+1)%32) * 4) + 0)'),
377 'AA64FpDestP1V1L': floatReg('((((dest+1)%32) * 4) + 1)'),
378 'AA64FpDestP2V1L': floatReg('((((dest+1)%32) * 4) + 2)'),
379 'AA64FpDestP3V1L': floatReg('((((dest+1)%32) * 4) + 3)'),
380
233 #Abstracted control reg operands
234 'MiscDest': cntrlReg('dest'),
235 'MiscOp1': cntrlReg('op1'),
381 #Abstracted control reg operands
382 'MiscDest': cntrlReg('dest'),
383 'MiscOp1': cntrlReg('op1'),
384 'MiscNsBankedDest': cntrlNsBankedReg('dest'),
385 'MiscNsBankedOp1': cntrlNsBankedReg('op1'),
386 'MiscNsBankedDest64': cntrlNsBankedReg64('dest'),
387 'MiscNsBankedOp164': cntrlNsBankedReg64('op1'),
236
237 #Fixed index control regs
238 'Cpsr': cntrlReg('MISCREG_CPSR', srtCpsr),
239 'CpsrQ': cntrlReg('MISCREG_CPSR_Q', srtCpsr),
240 'Spsr': cntrlRegNC('MISCREG_SPSR'),
241 'Fpsr': cntrlRegNC('MISCREG_FPSR'),
242 'Fpsid': cntrlRegNC('MISCREG_FPSID'),
243 'Fpscr': cntrlRegNC('MISCREG_FPSCR'),
244 'FpscrQc': cntrlRegNC('MISCREG_FPSCR_QC'),
245 'FpscrExc': cntrlRegNC('MISCREG_FPSCR_EXC'),
246 'Cpacr': cntrlReg('MISCREG_CPACR'),
388
389 #Fixed index control regs
390 'Cpsr': cntrlReg('MISCREG_CPSR', srtCpsr),
391 'CpsrQ': cntrlReg('MISCREG_CPSR_Q', srtCpsr),
392 'Spsr': cntrlRegNC('MISCREG_SPSR'),
393 'Fpsr': cntrlRegNC('MISCREG_FPSR'),
394 'Fpsid': cntrlRegNC('MISCREG_FPSID'),
395 'Fpscr': cntrlRegNC('MISCREG_FPSCR'),
396 'FpscrQc': cntrlRegNC('MISCREG_FPSCR_QC'),
397 'FpscrExc': cntrlRegNC('MISCREG_FPSCR_EXC'),
398 'Cpacr': cntrlReg('MISCREG_CPACR'),
399 'Cpacr64': cntrlReg('MISCREG_CPACR_EL1'),
247 'Fpexc': cntrlRegNC('MISCREG_FPEXC'),
400 'Fpexc': cntrlRegNC('MISCREG_FPEXC'),
401 'Nsacr': cntrlReg('MISCREG_NSACR'),
402 'ElrHyp': cntrlRegNC('MISCREG_ELR_HYP'),
403 'Hcr': cntrlReg('MISCREG_HCR'),
404 'Hcr64': cntrlReg('MISCREG_HCR_EL2'),
405 'Hdcr': cntrlReg('MISCREG_HDCR'),
406 'Hcptr': cntrlReg('MISCREG_HCPTR'),
407 'CptrEl264': cntrlReg('MISCREG_CPTR_EL2'),
408 'CptrEl364': cntrlReg('MISCREG_CPTR_EL3'),
409 'Hstr': cntrlReg('MISCREG_HSTR'),
410 'Scr': cntrlReg('MISCREG_SCR'),
411 'Scr64': cntrlReg('MISCREG_SCR_EL3'),
248 'Sctlr': cntrlRegNC('MISCREG_SCTLR'),
249 'SevMailbox': cntrlRegNC('MISCREG_SEV_MAILBOX'),
250 'LLSCLock': cntrlRegNC('MISCREG_LOCKFLAG'),
412 'Sctlr': cntrlRegNC('MISCREG_SCTLR'),
413 'SevMailbox': cntrlRegNC('MISCREG_SEV_MAILBOX'),
414 'LLSCLock': cntrlRegNC('MISCREG_LOCKFLAG'),
415 'Dczid' : cntrlRegNC('MISCREG_DCZID_EL0'),
251
252 #Register fields for microops
253 'URa' : intReg('ura'),
416
417 #Register fields for microops
418 'URa' : intReg('ura'),
419 'XURa' : intRegX64('ura'),
420 'WURa' : intRegW64('ura'),
254 'IWRa' : intRegIWPC('ura'),
255 'Fa' : floatReg('ura'),
421 'IWRa' : intRegIWPC('ura'),
422 'Fa' : floatReg('ura'),
423 'FaP1' : floatReg('ura + 1'),
256 'URb' : intReg('urb'),
424 'URb' : intReg('urb'),
425 'XURb' : intRegX64('urb'),
257 'URc' : intReg('urc'),
426 'URc' : intReg('urc'),
427 'XURc' : intRegX64('urc'),
258
259 #Memory Operand
260 'Mem': ('Mem', 'uw', None, ('IsMemRef', 'IsLoad', 'IsStore'), srtNormal),
261
262 #PCState fields
428
429 #Memory Operand
430 'Mem': ('Mem', 'uw', None, ('IsMemRef', 'IsLoad', 'IsStore'), srtNormal),
431
432 #PCState fields
433 'RawPC': pcStateReg('pc', srtPC),
263 'PC': pcStateReg('instPC', srtPC),
264 'NPC': pcStateReg('instNPC', srtPC),
265 'pNPC': pcStateReg('instNPC', srtEPC),
266 'IWNPC': pcStateReg('instIWNPC', srtPC),
267 'Thumb': pcStateReg('thumb', srtPC),
268 'NextThumb': pcStateReg('nextThumb', srtMode),
269 'NextJazelle': pcStateReg('nextJazelle', srtMode),
270 'NextItState': pcStateReg('nextItstate', srtMode),
271 'Itstate': pcStateReg('itstate', srtMode),
272
273 #Register operands depending on a field in the instruction encoding. These
274 #should be avoided since they may not be portable across different
275 #encodings of the same instruction.
276 'Rd': intReg('RD'),
277 'Rm': intReg('RM'),
278 'Rs': intReg('RS'),
279 'Rn': intReg('RN'),
280 'Rt': intReg('RT')
281}};
434 'PC': pcStateReg('instPC', srtPC),
435 'NPC': pcStateReg('instNPC', srtPC),
436 'pNPC': pcStateReg('instNPC', srtEPC),
437 'IWNPC': pcStateReg('instIWNPC', srtPC),
438 'Thumb': pcStateReg('thumb', srtPC),
439 'NextThumb': pcStateReg('nextThumb', srtMode),
440 'NextJazelle': pcStateReg('nextJazelle', srtMode),
441 'NextItState': pcStateReg('nextItstate', srtMode),
442 'Itstate': pcStateReg('itstate', srtMode),
443
444 #Register operands depending on a field in the instruction encoding. These
445 #should be avoided since they may not be portable across different
446 #encodings of the same instruction.
447 'Rd': intReg('RD'),
448 'Rm': intReg('RM'),
449 'Rs': intReg('RS'),
450 'Rn': intReg('RN'),
451 'Rt': intReg('RT')
452}};