Functionunit: move parameterized delay for fixtiming to latency field renamed as extralatency

Merge upstream/master into tmp-backend-merge-master

Bump rocket-chip (#2353)

chore: remove deprecated brackets, APIs, etc. (#2321)

fu: split io bundle into ctrl and data parts

backend: merge v2backend into backend

backend: add float inst support

v2backend: huge tmp commit

FMA: separate fmul/fadd/fma (#996)

* FMA: spearate fadd/fmul/fma

* exu: enable fast uop out from fmacExeUnit

Co-authored-by: Yinan Xu <[email protected]>

fudian: The new floating-point lib to replace hardfloat (#975)

* Add submodule 'fudian'

* IntToFP: use fudian

* FMA: use fudian.CMA

* FPToInt: remove recode format

misc: update PCL information (#899)

XiangShan is jointly released by ICT and PCL.

Add MulanPSL-2.0 License (#824)

In this commit, we add License for XiangShan project.

Refactor parameters, SimTop and difftest (#753)

* 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

Refactor parameters, SimTop and difftest (#753)

* 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 <[email protected]>
Co-authored-by: William Wang <[email protected]>

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fpu: wrap data part in a data module

[WIP] use berkeley-hardfloat in float units

[WIP] exu: spilt exuConfig and it's module

[Backend]: Optimize exu and fu

FPU: change fpu submodules's IOs to 'FunctionIO'

FPU: move fpu to xiangshan/backend/fu/fpu