diff options
| -rwxr-xr-x | cpu_dsl.py | 30 |
1 files changed, 28 insertions, 2 deletions
@@ -296,7 +296,7 @@ def _dispatchCImpl(prog, params): def _updateFlagsCImpl(prog, params, rawParams): autoUpdate, explicit = prog.flags.parseFlagUpdate(params[0]) output = [] - #TODO: handle autoUpdate flags + parity = None for flag in autoUpdate: calc = prog.flags.flagCalc[flag] calc,_,resultBit = calc.partition('-') @@ -353,12 +353,38 @@ def _updateFlagsCImpl(prog, params, rawParams): reg = reg, res = lastDst )) elif calc == 'parity': - pass + parity = storage + paritySize = prog.paramSize(prog.lastDst) + if prog.carryFlowDst: + parityDst = paritySrc = prog.carryFlowDst + else: + paritySrc = lastDst + decl,name = prog.getTemp(paritySize) + output.append(decl) + parityDst = name else: raise Exception('Unknown flag calc type: ' + calc) if prog.carryFlowDst: output.append('\n\t{dst} = {tmpdst};'.format(dst = prog.resolveParam(prog.lastDst, None, {}), tmpdst = prog.carryFlowDst)) prog.carryFlowDst = None + if parity: + if paritySize > 8: + if paritySize > 16: + output.append('\n\t{dst} = {src} ^ ({src} >> 16);'.format(dst=parityDst, src=paritySrc)) + paritySrc = parityDst + output.append('\n\t{dst} = {src} ^ ({src} >> 8);'.format(dst=parityDst, src=paritySrc)) + paritySrc = parityDst + output.append('\n\t{dst} = ({src} ^ ({src} >> 4)) & 0xF;'.format(dst=parityDst, src=paritySrc)) + if type(parity) is tuple: + reg,bit = parity + reg = prog.resolveParam(reg, None, {}) + output.append('\n\t{flag} = ({flag} & ~{mask}U) | ((0x6996 >> {parity}) << {bit} & {mask}U);'.format( + flag=reg, mask = 1 << bit, bit = bit, parity = parityDst + )) + else: + reg = prog.resolveParam(parity, None, {}) + output.append('\n\t{flag} = 0x9669 >> {parity} & 1;'.format(flag=reg, parity=parityDst)) + #TODO: combine explicit flags targeting the same storage location for flag in explicit: location = prog.flags.getStorage(flag) |