Ross Thompson
f1107c5d7b
Corrected a number of bugs in the branch predictor.
...
Added performance counters to individually track
branches; jumps, jump register, jal, and jalr; return.
jump and jump register are special cases of jal and jalr.
Similarlly return is a special case of jalr.
Also added counters to track if the branch direction was wrong,
btb target wrong, or the ras target was wrong.
Finally added one more counter to track if the BP incorrectly predicts
a non-cfi instruction.
2021-03-31 11:54:02 -05:00
Ross Thompson
1e83810450
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
Thomas Fleming
89a2fe5741
Finish finite state machines for page table walker
2021-03-25 02:48:40 -04:00
bbracker
5327dcfcc8
instrfaults not respecting stalls bugfix
2021-03-25 00:16:26 -04:00
Ross Thompson
cdb7d15709
Fixed bugs with the csr interacting with StallW. StallW is required to pervent updating a csr. Now have a working branch predictor and performance counters to track the number of commited branches and mispredictions.
2021-03-24 15:56:55 -05:00
Shreya Sanghai
09b90557f7
PC counts branch instructions
2021-03-23 14:25:51 -04:00
Shreya Sanghai
dfc86539cc
Merge branch 'gshare' into main
...
Conflicts:
wally-pipelined/regression/wave.do
2021-03-18 17:25:48 -04:00
Thomas Fleming
062c4d40da
Connect tlb, pagetablewalker, and memory
2021-03-18 14:35:46 -04:00
Shreya Sanghai
23a7c8cd92
made performance counters count branch misprediction
2021-03-16 11:24:17 -04:00
Thomas Fleming
e48dc38869
Export SATP_REGW from csrs to MMU modules
2021-03-05 01:22:53 -05:00
David Harris
73920282af
Eliminated flushing pipeline on CSR reads
2021-02-26 17:00:07 -05:00
David Harris
cc42655789
More memory interface, ALU testgen
2021-02-15 10:10:50 -05:00
David Harris
429f48e766
Rename ifu/dmem/ebu signals to match uarch diagram
2021-02-02 15:09:24 -05:00
David Harris
bb83fda1d8
Moved writeback pipeline registers from datapth into DMEM and CSR
2021-02-02 13:02:31 -05:00
David Harris
92bf1674b4
Moved fpu to temporary location to fix compile and cleaned up interface formatting
2021-02-01 23:44:41 -05:00
David Harris
07af481b67
Reorganized src hierarchically
2021-01-30 11:50:37 -05:00
