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554e7d0973
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79 Commits

Author SHA1 Message Date
Ross Thompson
554e7d0973 Minor fix to btb. 2023-03-01 10:45:40 -06:00
Ross Thompson
a6917d07f3 Name cleanup. 2023-02-28 17:48:58 -06:00
Ross Thompson
4c0e7f297a Found the performance bug with the branch predictor btb power saving update. 2023-02-28 15:57:34 -06:00
Ross Thompson
2ebe600f54 Name changes to reflect diagrams. 2023-02-28 15:37:25 -06:00
Ross Thompson
be4823f7dd Undid the btb update as it reduces performance. 2023-02-28 15:21:56 -06:00
Ross Thompson
9dd3379744 This icpred and btb changes are causing a performance issue. 2023-02-27 20:00:50 -06:00
Ross Thompson
544abe2819 Modified the BTB to save power by not updating when the prediction is unchanged. 2023-02-27 17:37:29 -06:00
Ross Thompson
bc5aecf948 Merge branch 'main' of https://github.com/openhwgroup/cvw 2023-02-27 09:48:03 -06:00
Ross Thompson
318189e5e6 Signal name changes. 2023-02-27 00:39:19 -06:00
Ross Thompson
c89812b2d4 Branch predictor cleanup. 2023-02-26 21:28:36 -06:00
Ross Thompson
e8c5e5b5ff Create module for instruction class prediction and decoding. 2023-02-26 20:20:30 -06:00
David Harris
21b28fd1bb Renamed DAPageFault to UpdateDA 2023-02-26 17:51:45 -08:00
Ross Thompson
72be4318b8 Merge branch 'main' of https://github.com/openhwgroup/cvw into main 2023-02-26 12:06:06 -06:00
David Harris
35653a18b7 Renamed HPTW_WRITES_SUPPORTED to SVADU_SUPPORTED 2023-02-26 09:38:32 -08:00
Ross Thompson
7f8034013d PHT was enabled using the wrong ~flush and ~stall. 2023-02-24 22:57:32 -06:00
Ross Thompson
eb9dc7e67d gshare cleanup. 2023-02-24 22:55:51 -06:00
Ross Thompson
9df05f0b3d More signal renames. 2023-02-24 19:56:55 -06:00
Ross Thompson
8bd4a4c35b Renamed signals to match new figures. 2023-02-24 19:51:47 -06:00
Ross Thompson
f95f326b3d Renamed signals to match figure 10.18. 2023-02-24 19:22:14 -06:00
Ross Thompson
4031b89f18 Possible fix to btb performance issue. 2023-02-24 18:36:41 -06:00
Ross Thompson
ea8cb7dd78 Cleanup. 2023-02-24 18:20:42 -06:00
Ross Thompson
a14dcaa241 Completed critical path gshare fix. 2023-02-24 18:02:00 -06:00
Ross Thompson
31d6531af2 Prep to fix gshare critical path. 2023-02-24 17:54:48 -06:00
Ross Thompson
5db56460b9 Modified btb forwarding logic to reduce critical path. 2023-02-24 17:47:43 -06:00
Ross Thompson
2920179435 Major cleanup of bp. 2023-02-23 16:19:03 -06:00
Ross Thompson
fa49de8391 Partial replacement of InstrClassX with {JalX, RetX, JumpX, and BranchX}. 2023-02-23 15:55:34 -06:00
Ross Thompson
8503982328 Branch predictor cleanup. 2023-02-23 15:15:14 -06:00
Ross Thompson
403b2b7be1 Moved more branch predictor logic into the performance counter block. 2023-02-23 15:14:56 -06:00
Ross Thompson
526f046fb0 Added if generate around bp logic only used with performance counters. 2023-02-23 14:39:31 -06:00
Ross Thompson
2d919fa9e3 Renamed PCPredX to BTAX. 2023-02-23 14:33:32 -06:00
Ross Thompson
c736d7c1f3 Fixed bug in basic gshare. 2023-02-22 12:54:46 -06:00
Ross Thompson
849856034b Merge branch 'main' of https://github.com/openhwgroup/cvw 2023-02-22 09:11:57 -06:00
Ross Thompson
5dde3af22e 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
David Harris
f0566173e6 Merge branch 'main' of https://github.com/openhwgroup/cvw into dev 2023-02-21 09:58:18 -08:00
David Harris
a445e53e8d Fixed Issue #106: fld rasies load access fault instead of illegal instruction. The IEU controller had considered all fp loads and stores to be legal regardless of whether the FPU is enabled or the type is supported. Merged illegal instruction detection from both units into the Decode stage, saving two bits of pipeline register as well. 2023-02-21 09:32:17 -08:00
Ross Thompson
7f0d64d0a6 Fixed typo in the global branch predictor. 2023-02-20 18:48:02 -06:00
Ross Thompson
2c2c1b5221 Cleanup branch predictor files. 2023-02-20 18:45:45 -06:00
Ross Thompson
7df3a84060 Renamed branch predictors and consolidated global and gshare predictors. 2023-02-20 18:42:37 -06:00
Ross Thompson
6eefa5b1e3 Fixed another bug in the btb. 2023-02-20 17:54:22 -06:00
Ross Thompson
d2b7047744 Fixed forwarding bug in the BTB. 2023-02-20 17:03:45 -06:00
Ross Thompson
545af7697f Simiplified BTB. 2023-02-20 15:39:42 -06:00
David Harris
36b2d530c4 Merge pull request #98 from ross144/main 
New gshare implementation
 2023-02-20 11:27:47 -08:00
David Harris
626715befd Fixed IROM size parameters 2023-02-20 05:32:43 -08:00
David Harris
472c7da399 New expression for BTB_SIZE to avoid error during sky90 synthesis 2023-02-20 04:02:00 -08:00
Ross Thompson
4db249ca5d Simplified BTB by removing the valid bit. the instruction class provides the equivalent information. 2023-02-19 23:53:20 -06:00
Ross Thompson
407d9e7b4a Merge branch 'main' of https://github.com/openhwgroup/cvw 2023-02-19 22:54:27 -06:00
Ross Thompson
0f98cfe5b4 Simplified branch predictor. 2023-02-19 22:49:48 -06:00
David Harris
d07c6386b2 Added BTB_SIZE parameter independent of BPRED_SIIZE 2023-02-19 20:13:50 -08:00
David Harris
20ced0653c Parameterized btb to depend on BPRED_SIZE 2023-02-19 19:59:07 -08:00
Ross Thompson
89aa57e25e Possibly much better branch predictor implemention. 
The complexity is significantly reduced.
 2023-02-19 00:17:37 -06:00