Ross Thompson 8a035104ac It's a bit sloppy, but the global history predictor is working correctly now. ... There were two major bugs with the predictor. First the update mechanism was completely wrong. The PHT is updated with the GHR that was used to lookup the prediction. PHT[GHR] = Sat2(PHT[GHR], branch outcome). Second the GHR needs to be updated speculatively as the branch is predicted. This is important so that back to back branches' GHRs are not the same. The must be different to avoid aliasing. Speculation of the GHR update allows them to be different. On mis prediction the GHR must be reverted. This implementation is a bit sloppy with names and now the GHR recovery is performed. Updates to follow.		2021-05-27 23:06:28 -05:00
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BTBPredictor.txt	Merge of main with the new icache and the branch predictor. I believe there is a bug in the icache with unaligned memory access. The second part of the access is incorrectly relying on the PCF being the address of the next two bytes of the instruction. However this is not always the case as the branch predictor can get the wrong target address. The icache needs to generate the +2 address internally.	2021-03-30 23:18:20 -05:00
twoBitPredictor.txt	Merge of main with the new icache and the branch predictor. I believe there is a bug in the icache with unaligned memory access. The second part of the access is incorrectly relying on the PCF being the address of the next two bytes of the instruction. However this is not always the case as the branch predictor can get the wrong target address. The icache needs to generate the +2 address internally.	2021-03-30 23:18:20 -05:00
wally-config.vh	It's a bit sloppy, but the global history predictor is working correctly now.	2021-05-27 23:06:28 -05:00
wally-constants.vh	fixed subtle typo in icache fsm. Was messing up hit spill hit.	2021-05-03 16:55:36 -05:00