Sujet : Re: fractional PCs
De : robfi680 (at) *nospam* gmail.com (Robert Finch)
Groupes : comp.archDate : 27. Apr 2025, 12:36:05
Autres entêtes
Organisation : A noiseless patient Spider
Message-ID : <vul4r4$n19o$1@dont-email.me>
References : 1 2 3 4 5 6 7 8 9 10 11 12 13 14
User-Agent : Mozilla Thunderbird
Representing the PC as a fixed-point number because it records which micro-op of the micro-op stream for an instruction got interrupted. It was easier to restart the micro-op stream than to defer interrupts to the next instruction.
The lead micro-ops on a interrupt return are just NOP'd out. ATM there is no micro-op state that needs to be saved and restored through context switches, other than the index into the stream which can be saved as part of the PC.
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