* dpq: add slow path for non-critical registers
This commit separates the data module in Dispatch to slow and fast path.
Slow path stores the data with a bad timing at Dispatch but a good timing
at Dispatch2. Thus should benefit the timing at Dispatch, such as the LFST.
For now, we merge the slow and fast data module. Chisel DCE does not
eliminate the dead registers. We manully merge the two data modules
for now.
* dpq: optimize timing for enqPtr/deqPtr matching
This commit optimizes the matching timing between enqPtr and deqPtr,
which is used further for bypassing enqData to deqData.
Now enqOffset and deqPtr/enqPtr matching work in parallel.
* difftest: use DPI-C to refactor difftest
In this commit, difftest is refactored with DPI-C calls.
There're a few reasons:
(1) From Verilator's manual, DPI-C calls should be more efficient than accessing from dut_ptr.
(2) DPI-C is cross-platform (Verilator, VCS, ...)
(3) difftest APIs are splited from emu.cpp to possibly support more backend platforms
(NEMU, Spike, ...)
The performance at this commit is quite slower than the original emu.
Performance issues will be fixed later.
* [WIP] SimTop: try to use 'XSTop' as soc
* CircularQueuePtr: ues F-bounded polymorphis instead implict helper
* Refactor parameters & Clean up code
* difftest: support basic difftest
* Support diffetst in new sim top
* Difftest; convert recode fmt to ieee754 when comparing fp regs
* Difftest: pass sign-ext pc to dpic functions && fix exception pc
* Debug: add int/exc inst wb to debug queue
* Difftest: pass sign-ext pc to dpic functions && fix exception pc
* Difftest: fix naive commit num limit
Co-authored-by: Yinan Xu <xuyinan1997@gmail.com>
Co-authored-by: William Wang <zeweiwang@outlook.com>
Yinan Xu
Lemover
Jiawei Lin
William Wang
Yinan Xu