- adds a mutable singleton (PlusArgArtefacts) to store information
about Rocket PlusArgs
- adds methods to PlusArgArtefacts to emit C snippets that are
consumed by emulator.cc for correct argument parsing and help text
generation
- emits snippets in $(CONFIG).plusArgs via BaseCoreplex-set
ElaborationArtefacts
- modify emulator/Makefrag-verilator to include $(CONFIG).plusArgs
- cleanup help text (docstring) for existing PlusArgs
Signed-off-by: Schuyler Eldridge <schuyler.eldridge@gmail.com>
- Put correctness responsibility on Frontend, not IBuf, for improved
separation of concerns. Frontend must detect case that the BTB
predicts a taken branch in the middle of an instruction.
- Pass BTB information down pipeline unconditionally, fixing case that
screws up the branch history when the BTB misses and the instruction
is misaligned.
- Remove jumpInFrontend option; it's now unconditional.
- Default to one-bit counters in the BHT. For tiny BHTs like these, it's
more resource efficient to have a larger index space than to have
hysteresis.
* CSR provides a decode port to check for an illegal instruction.
* This commit now allows for multiple instructions in decode to get this
illegal instruction information.
* This commit leverages the existing decodeWidth parameter. This will
potentially over-provision the number of decode ports needed for
RVC-enabled cores.
Closes#1068
We were using it to compute the next PC on flush vs. replay (which require
PC+4 and PC, respectively). This fix gets rid of the adder altogether by
reusing the M-stage PC in the flush case, which by construction holds PC+4.
Andrew Waterman
Henry Cook
Schuyler Eldridge
Richard Xia
Christopher Celio
Andrew Waterman
Megan Wachs
Palmer Dabbelt