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87013ccaf0
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53 Commits

Author SHA1 Message Date
Ross Thompson
87013ccaf0 Found the performance bug with the branch predictor btb power saving update. 2023-02-28 15:57:34 -06:00
Ross Thompson
8af61c0cc0 Name changes to reflect diagrams. 2023-02-28 15:37:25 -06:00
Ross Thompson
a823d8d021 Undid the btb update as it reduces performance. 2023-02-28 15:21:56 -06:00
Ross Thompson
3261f31e88 This icpred and btb changes are causing a performance issue. 2023-02-27 20:00:50 -06:00
Ross Thompson
69e8358639 Modified the BTB to save power by not updating when the prediction is unchanged. 2023-02-27 17:37:29 -06:00
Ross Thompson
a81cc883e9 Signal name changes. 2023-02-27 00:39:19 -06:00
Ross Thompson
447f6b1443 Branch predictor cleanup. 2023-02-26 21:28:36 -06:00
Ross Thompson
3804626166 Create module for instruction class prediction and decoding. 2023-02-26 20:20:30 -06:00
Ross Thompson
63b9f9ca3d gshare cleanup. 2023-02-24 22:55:51 -06:00
Ross Thompson
e549bec060 Renamed signals to match new figures. 2023-02-24 19:51:47 -06:00
Ross Thompson
6ff524d843 Renamed signals to match figure 10.18. 2023-02-24 19:22:14 -06:00
Ross Thompson
4058a49985 Possible fix to btb performance issue. 2023-02-24 18:36:41 -06:00
Ross Thompson
d030d323fd Completed critical path gshare fix. 2023-02-24 18:02:00 -06:00
Ross Thompson
c2021927ce Prep to fix gshare critical path. 2023-02-24 17:54:48 -06:00
Ross Thompson
4ffaa75c2a Modified btb forwarding logic to reduce critical path. 2023-02-24 17:47:43 -06:00
Ross Thompson
6e8791a0a5 Major cleanup of bp. 2023-02-23 16:19:03 -06:00
Ross Thompson
d880720b7e Partial replacement of InstrClassX with {JalX, RetX, JumpX, and BranchX}. 2023-02-23 15:55:34 -06:00
Ross Thompson
500764f97b Branch predictor cleanup. 2023-02-23 15:15:14 -06:00
Ross Thompson
70f7f59332 Moved more branch predictor logic into the performance counter block. 2023-02-23 15:14:56 -06:00
Ross Thompson
195343c84f Added if generate around bp logic only used with performance counters. 2023-02-23 14:39:31 -06:00
Ross Thompson
ed91fc5ce3 Renamed PCPredX to BTAX. 2023-02-23 14:33:32 -06:00
Ross Thompson
5ecbc830cf Oups. Turns out dc_shell does not like string parameters. 
Switched gshare to use an integer parameter to select between gshare and global.
 2023-02-22 09:11:46 -06:00
Ross Thompson
a14c71bd95 Renamed branch predictors and consolidated global and gshare predictors. 2023-02-20 18:42:37 -06:00
Ross Thompson
68e39eeb66 Fixed another bug in the btb. 2023-02-20 17:54:22 -06:00
Ross Thompson
5187c78184 Fixed forwarding bug in the BTB. 2023-02-20 17:03:45 -06:00
Ross Thompson
1982c66b72 Simiplified BTB. 2023-02-20 15:39:42 -06:00
Ross Thompson
2d417c33a4 Simplified BTB by removing the valid bit. the instruction class provides the equivalent information. 2023-02-19 23:53:20 -06:00
Ross Thompson
0d79c0cebe Merge branch 'main' of https://github.com/openhwgroup/cvw 2023-02-19 22:54:27 -06:00
Ross Thompson
b32093b33b Simplified branch predictor. 2023-02-19 22:49:48 -06:00
David Harris
0ac9c9e62a Added BTB_SIZE parameter independent of BPRED_SIIZE 2023-02-19 20:13:50 -08:00
David Harris
5b197f4f9d Parameterized btb to depend on BPRED_SIZE 2023-02-19 19:59:07 -08:00
Ross Thompson
9ee48637dc Possibly much better branch predictor implemention. 
The complexity is significantly reduced.
 2023-02-19 00:17:37 -06:00
Ross Thompson
d44cb1febb Minor fix. 2023-02-18 23:55:46 -06:00
David Harris
0eda753dc4 Removed unused PredInstrClassE register from bpred 2023-02-18 05:59:25 -08:00
Ross Thompson
2f1bebfd57 Fixed global history predictor. 2023-02-17 16:05:48 -06:00
Ross Thompson
0d271130b9 Fixed a branch predictor performance issue. 2023-02-17 15:37:03 -06:00
Ross Thompson
a325adf1be Fixed bug with branch predictor. 2023-02-17 10:57:50 -06:00
Ross Thompson
094b307724 Merge branch 'main' of github.com:ross144/cvw 2023-02-13 18:54:07 -06:00
Ross Thompson
9c9acc0055 Updated gshare (no speculation) to have better performance. 2023-02-13 18:52:52 -06:00
Ross Thompson
33d2bf84f8 More fixeds to global history. 2023-02-13 18:08:51 -06:00
Ross Thompson
b298a8afc5 Created copy of gshare. I think there may be a simpler implementation. 2023-02-13 17:29:51 -06:00
Ross Thompson
a80dbd3aec Further branch predictor improvements. 2023-02-13 17:23:56 -06:00
Ross Thompson
717cba270c Partial improvement. 2023-02-13 17:10:24 -06:00
Ross Thompson
f4af38a004 Hacked commit. Fixes the gshare bugs introduced last week. 
Need to recover the good changes in the next commit.
 2023-02-13 16:14:17 -06:00
Ross Thompson
1d74663f42 Partial fix for gshare bugs from the last two weeks. 2023-02-13 11:57:25 -06:00
Ross Thompson
58749a8c57 Removed another bit from btb class. 2023-02-12 11:33:43 -06:00
Ross Thompson
1e0667db1d More simplifications to the BP. 2023-02-10 17:09:35 -06:00
Ross Thompson
9c4da7381f Experimental branch prediction optimization. 2023-02-10 15:45:56 -06:00
Ross Thompson
c229f0064e Modified branch predictor to use InstrValidE and InstrValidD rather than the more complex InstrClassE | WrongClassE logic. 2023-02-10 10:33:10 -06:00
Ross Thompson
faf7cd8c8a Updated globalhistory predictor. 2023-02-09 14:48:02 -06:00