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comparison cpu_dsl.py @ 1713:0264d8b288e2

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Implement parity flag calculation type
author Michael Pavone <pavone@retrodev.com>
date Tue, 29 Jan 2019 22:16:57 -0800
parents 87d4f0b4bf1d
children 4fd84c3efc72
comparison
equal deleted inserted replaced
1712:0a9a88b3d061 1713:0264d8b288e2
294 return '\n\timpl_{tbl}[{op}](context);'.format(tbl = table, op = params[0]) 294 return '\n\timpl_{tbl}[{op}](context);'.format(tbl = table, op = params[0])
295 295
296 def _updateFlagsCImpl(prog, params, rawParams): 296 def _updateFlagsCImpl(prog, params, rawParams):
297 autoUpdate, explicit = prog.flags.parseFlagUpdate(params[0]) 297 autoUpdate, explicit = prog.flags.parseFlagUpdate(params[0])
298 output = [] 298 output = []
299 #TODO: handle autoUpdate flags 299 parity = None
300 for flag in autoUpdate: 300 for flag in autoUpdate:
301 calc = prog.flags.flagCalc[flag] 301 calc = prog.flags.flagCalc[flag]
302 calc,_,resultBit = calc.partition('-') 302 calc,_,resultBit = calc.partition('-')
303 if prog.carryFlowDst: 303 if prog.carryFlowDst:
304 lastDst = prog.carryFlowDst 304 lastDst = prog.carryFlowDst
351 reg = prog.resolveParam(storage, None, {}) 351 reg = prog.resolveParam(storage, None, {})
352 output.append('\n\t{reg} = {res} == 0;'.format( 352 output.append('\n\t{reg} = {res} == 0;'.format(
353 reg = reg, res = lastDst 353 reg = reg, res = lastDst
354 )) 354 ))
355 elif calc == 'parity': 355 elif calc == 'parity':
356 pass 356 parity = storage
357 paritySize = prog.paramSize(prog.lastDst)
358 if prog.carryFlowDst:
359 parityDst = paritySrc = prog.carryFlowDst
360 else:
361 paritySrc = lastDst
362 decl,name = prog.getTemp(paritySize)
363 output.append(decl)
364 parityDst = name
357 else: 365 else:
358 raise Exception('Unknown flag calc type: ' + calc) 366 raise Exception('Unknown flag calc type: ' + calc)
359 if prog.carryFlowDst: 367 if prog.carryFlowDst:
360 output.append('\n\t{dst} = {tmpdst};'.format(dst = prog.resolveParam(prog.lastDst, None, {}), tmpdst = prog.carryFlowDst)) 368 output.append('\n\t{dst} = {tmpdst};'.format(dst = prog.resolveParam(prog.lastDst, None, {}), tmpdst = prog.carryFlowDst))
361 prog.carryFlowDst = None 369 prog.carryFlowDst = None
370 if parity:
371 if paritySize > 8:
372 if paritySize > 16:
373 output.append('\n\t{dst} = {src} ^ ({src} >> 16);'.format(dst=parityDst, src=paritySrc))
374 paritySrc = parityDst
375 output.append('\n\t{dst} = {src} ^ ({src} >> 8);'.format(dst=parityDst, src=paritySrc))
376 paritySrc = parityDst
377 output.append('\n\t{dst} = ({src} ^ ({src} >> 4)) & 0xF;'.format(dst=parityDst, src=paritySrc))
378 if type(parity) is tuple:
379 reg,bit = parity
380 reg = prog.resolveParam(reg, None, {})
381 output.append('\n\t{flag} = ({flag} & ~{mask}U) | ((0x6996 >> {parity}) << {bit} & {mask}U);'.format(
382 flag=reg, mask = 1 << bit, bit = bit, parity = parityDst
383 ))
384 else:
385 reg = prog.resolveParam(parity, None, {})
386 output.append('\n\t{flag} = 0x9669 >> {parity} & 1;'.format(flag=reg, parity=parityDst))
387
362 #TODO: combine explicit flags targeting the same storage location 388 #TODO: combine explicit flags targeting the same storage location
363 for flag in explicit: 389 for flag in explicit:
364 location = prog.flags.getStorage(flag) 390 location = prog.flags.getStorage(flag)
365 if type(location) is tuple: 391 if type(location) is tuple:
366 reg,bit = location 392 reg,bit = location