feat(Svpbmt): support WMO memory access and outstanding of NC #3900
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* feat(LDU): add support for NC in LoadUnit * feat(LQ,UB): add support for NC in load queue and uncache buffer * chore(pbmt): add xsperf for nc ld statistic
* fix(PBMT): skip nc difftest and handle the conflict of nc and normal store * fix(PBMT): nc st req is changed to a state machine execution * fix(pbmt): fix typo and control error of nc ld * fix(pbmt): nc data assignment error * fix(pbmt): nc should be used to wakeup * fix(pbmt): remove wrong assert * fix(pbmt): lots of bugs of nc st ld forward * fix(pbmt): fix address align error
* fix(uncache): delay flush until receiving uncache resp when state is not idle * style(pbmt): remove some useless code and comments * fix(uncache): not alloc and ready when existing same address entry
* style(pbmt): remove outstanding constant which is just for self-test * fix(uncache): added mask comparison for `addrMatch` * style(mem): code normalization * fix(pbmt): handle cases where the load unit is byte, word, etc * style(uncache): fix an import * fix(uncahce): address match should use non-offset address when forwading In this case, to ensure correct forwarding, stores with the same address but overlapping masks cannot be entered at the same time. * style(RAR): remove redundant design of `nc` reg
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Here, "NC" represents accesses with PBMT=1, characterized by properties such as non-cacheable, idempotent, weakly-ordered (RVWMO), and main memory. This PR supports the WMO memory access and outstanding uncache of NC. The detailed architecture diagram is as follows.
