Update OpenFPGA (#3056)

* [Bison] Raised Minimum Bison Version from 3.0 to 3.3

Raised the minimum Bison version to 3.3 since deprecation warnings were
showing up in libblifparse and libsdcparse which could not be resolved
unless the Bison version was 3.3.

* more fixes for bitstream generation with flat router

* [Router] Upstream Fine-Grained Parallel Router (FPT'24)

Upstreamed the fine-grained parallel router implementation into the VTR
master. The original branch is https://github.com/verilog-to-routing/vtr-verilog-to-routing/tree/mq-parallel-router.

Modified the MultiQueue (SPAA'24) implementation and integrated it into
the VTR codebase.

* [ParallelRouter] Removed Boost from FG Parallel Router

The original FG parallel router used to use boost. VTR does not install
boost by default. Moved to STL instead.

* [Router] Fix Code Formatting Issues

* [Router] Added ConnectionRouter Abstraction and Reduced Code Duplication

Added a partial abstract class for ConnectionRouter, derived from the
pure abstract ConnectionRouterInterface.

The SerialConnectionRouter and ParallelConnectionRouter classes are now
derived from the ConnectionRouter class, utilizing the common class
members and helper functions to reduce code duplication.

* [Router] Added Code Comments and Documentation for Connection Routers

Added Doxygen-style code comments and documentation for connection
routers, including the ConnectionRouter abstract class, the Parallel-
ConnectionRouter concrete class, and the SerialConnectionRouter concrete
class.

Updated the helper messages for command-line options added for parallel
connection router.

* [Router] Fixed Interface Issues in NestedNetlistRouter and Code Formats

Fixed the interface issues of ConnectionRouter in NestedNetlistRouter.

Fixed code formats.

Fixed typo in read_options.cpp.

* [Router] Updated Command-Line Usage for Parallel Connection Router

Updated the command-line usage for parallel connection router in both
Read the Docs and read_options.cpp.

* [Router] Added Regression Tests for Parallel Connection Router

Added regression tests for parallel connection router by appending extra
sets of configurations to those VTR flow regression tests previously
selected by Fahri for testing coarse-grained parallel router.

Removed VPR connection router test (vpr/test/test_connection_router.cpp),
since it has been out-dated for a very long time and has caused lots of
trouble for running VPR C++ tests locally.

* Fixed Code Formatting Issue

Fixed a weird code formatting issue in libs/librtlnumber/src/include/
internal_bits.hpp. GitHub CI said the file failed dev/check-format.sh,
however, the same script runs perfectly in my local environment. Double
checked the version of clang-format, which seemed to be the same as CI.

Directly copied the file from the GitHub repo to resolve this issue.

* [Router] Fixed `No source in route tree` in ParallelConnectionRouter

The `No source in route tree` bug in ParallelConnectionRouter (since
commit 875b98e) has been fixed. It turns out that putting another member
variable `MultiQueueDAryHeap<HeapImplementation::arg_D> heap_` in the
derived class ParallelConnectionRouter together with the existing
`HeapImplementation heap_` in the base class ConnectionRouter causes the
issue. The solution is to keep `heap_` only in the base class and use
`ConnectionRouter<MultiQueueDAryHeap<HeapImplementation::arg_D>>` rather
than `ConnectionRouter<HeapImplementation>` for deriving the parallel
connection router.

Please note that ParallelConnectionRouter still has some bugs (i.e.,
getting stuck in the MultiQueue pop). This commit is not fully working.
Please do not use it for any experiments.

Updated the previously incorrect command-line options for the parallel
connection router in the regression tests.

* [AP][MassLegalizer] Revistited Mass Legalizer

Found that the mass legalizer was not spreading out the blocks well
enough according to the mass.

Revistied the spatial partitioning in the mass legalizer. Before, we
just cut the window in half in the larger dimension. This was fine,
however it may create an inbalanced cut which can cause things to not
spread well. Instead, we now search for the best partition by trying
different partition lines and computing how balanced the partition is.
Although this is more expensive than before, by creating more balanced
partitions, it should allow the mass legalizer to converge faster. Time
in the mass legalizer is also dominated by partitioning the blocks, so
increasing the time to choose the partition line should not have that
large of an effect anyways.

Found an oversight with how blocks were partitioned when one of the
partitions become overfilled. Fixed this issue.

* Inverse use of macro_can_be_placed argument check_all_legality to align with meaning

* [vpr][pack] fix merge issues w/ flat sync list

* make format

* [packages] add clang-format

* make format 2

* Invalid C++ fix

* [docker] set ubuntu version to 24.04

* [dockerfile] enable system-wide python package installation for pip

* [dockerfile] add comment

* [package] check whehter clang-format-18 package exist

* [package] remove deprecated names-only option

* [package] remove if condition

* [doc] update quick start on installing packages

* make format
enum class e_rr_type
a few remaining t_rr_type vals
CHANY ---> t_rr_type::CHANY
CHANX ---> t_rr_type::CHANX
OPIN ---> t_rr_type::OPIN
IPIN ---> t_rr_type::IPIN
SINK ---> t_rr_type::SINK
SOURCE ---> t_rr_type::SOURCE

* [Router] Finally fixed the weird bug in parallel connection router

Fixed the weird bug in parallel connection router as mentioned in commit
f73212c. The bug occurred because two function parameters 'num_threads'
and 'num_queues' have been misplaced when instantiating the MQ_IO. This
took two weeks to figure out exactly.

The VTR benchmark (`vtr_reg_qor_chain` task) has been tested/passed for
different cases (1) 'serial mode' 1T+2Q (1 thread, 2 queues), (2) 2T+4Q,
and (3) 4T+2Q.

The determinism has also been verified for the VTR benchmark.

* [Router] Fixed Code Review Comments and Cleanup Codebase

Added more explanation to the command-line options messages and code
comments.

Cleaned up ParallelConnectionRouter-related codebase.

* [doc] clarify that clang-format is not required to build VPR

* remove typedef t_rr_type

* doxygen comment for Direction

* add vtr::array class

* make rr_node_typename of type vtr::array to index it only with e_rr_type

* add default constructor to vtr::array

* access rr_node_indices_ with e_rr_type instead of casting to size_t

* add single argument constructor to vtr::array

* [Router] Updated Golden Results for Parallel Connection Router CI Tests

Updated the golden results for CI tests for parallel connection router:
 - `vtr_reg_strong/koios_test`
 - `vtr_reg_strong/strong_flat_router`
 - `vtr_reg_strong/strong_multiclock`
 - `vtr_reg_strong/strong_timing`

* use vtr::array to index some arrays using e_rr_type

* make format

* avoid using e_rr_type and casting it in place_macro

* [vpr][base] fix assigned pb_graph_pin when graph node is not primitive

* [vpr][pack] pass logical type to alloc_and_laod_pb_route

* [vpr][pack] update alloc_and_load_pb_route header file

* [vpr][pack] fix pb_graph_pin assignment in load_trace_to_pb_route

* [test] keep 3d sb and cb tests

* [vpr][pack] add intra_lb_pb_pin_lookup_ to cluster legalizer

* [vpr][pack] initializer intra_lb_pb_pin_lookup and pass it to alloc_and_load_pb_route

* [vpr][pack] use intra_lb_pb_pin_lookup to get pb_pin from pin number

* make format

* add vtr::array to docs

* [vpr][pack] remove casting net id

* [vpr][pack] add doxygen comment for alloc_and_load_pb_route

* [vpr][pack] remove redundant parameters

* [vpr][pack] polish load_trace_to_pb_route

* make format

* [vpr][pack] fix parameter shadowing

* [AP][HotFix] Fixed Bug With Solver Putting Blocks Off-Device

After moving fixed blocks to the center of tiles, there is a very small
chance that blocks go off the device due to rounding. This is such a
small effect that it does not show up locally on my machine, but it
shows up on CI. Clamping the positions of blocks after solving to be
just within the device region.

* Increase the daily stale issue action API call limit

* [vpr][pack] add a method to get root_ipin

* [vpr][pack] remove unused var

* [Router] Added Assert for MQ_IO numQueues and Updated Golden Results

Added assert for MultiQueueIO numQueues to ensure it must be greater
than two.

Updated CI test tasks to ensure the parallel connection router runs in
Dijkstra mode to ensure determinism and avoid hanging in CI runs.

* [AP][HotFix] Placed Fixed Blocks First During IP

The cost terms in the AP initial placer were not placing fixed blocks
early enough, causing other blocks to take their place and causing the
initial placer to not return a solution.

Blocks which have region constraints are now placed first based on how
constrained they are. More constrained blocks (can only be placed in a
smaller region) will be placed first.

Also found that macros that contained fixed blocks were not observing
these constraints when calculating the centroid position of the macro.
For constrained macros, projected the centroid position onto the
partition region to get the closest point in the partition region to the
calculated centroid. This new centroid is used to then perform the
placement.

* [STA] Added Option to Remove Parameters from Post-Implementation Netlist

When performing post-implementation timing analysis using OpenSTA, the
generated netlist cannot use parameters since each module needs to
correspond with a cell in a liberty file.

Added a command-line option which tells the netlist writer to not use
parameters when generating the netlist. If a primitive cannot be
generated without using parameters, it will error out.

* [Tatum][Parse] Fixed Extraneous Warning With get_clocks

The get_clocks command is used in an SDC file to reference a set of
clocks by name using a regex string. The code to do this tries to
produce a warning if get_clocks is used on a regex string and no clocks
could be found. The issue is that the code to do this was mistakenly
producing this warning for each clock in the circuit. For example, if we
had {clk1, clk2, clk3} and we wanted to do "get_clocks {clk3}", we will
get two warnings since clk1 and clk2 did not match.

Fixed this by moving the warning out of one loop nest.

* Remove PR staling
This commit sets the number of days before marking
issues or PRs as stale to 100 years. This number is
overriden for issues to be 1 years but stays 100 years
for PRs. This means that PR effectively do not get
marked as stale.

* [LibArchFPGA] Updating Model Data Structures

The logical models (the technology-mapped logical blocks) for an
architecture were stored using two independent linked lists. One for the
library models (the models that all architectures have, such as luts and
ffs) and one of the user models. This linked lists were hard to traverse
and were injecting pointers all across VPR.

Created a new class to store and manage the logical models. This class
maintains a unique ID for each logical model (similar to the netlist
data structures in VPR). It also contains helper methods to make working
with the logical models easier.

* fix comments from alex

* revert prepacker changes

* [vpr][pack] add get_pattern_blocks

* [vpr][pack] add blocks in get_all_connected_primitive_pins if they are a part of the pattern

* make format

* Bump libs/EXTERNAL/libcatch2 from `76f70b1` to `5abfc0a`

Bumps [libs/EXTERNAL/libcatch2](https://github.com/catchorg/Catch2) from `76f70b1` to `5abfc0a`.
- [Release notes](https://github.com/catchorg/Catch2/releases)
- [Commits](catchorg/Catch2@76f70b1...5abfc0a)

---
updated-dependencies:
- dependency-name: libs/EXTERNAL/libcatch2
  dependency-version: 5abfc0aa9c1ef4cb40c9f387495134dab02e1af2
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

* [vpr][pack] add more comments

* Add helper functions to t_pb_type

* Change t_pb_type users to use helper functions

* Add documentation for t_pb_type::is_root and is_primitive

* Fix formatting in libarchfpga/physical_types.h

* [vpr][pack] change count method to find

* [Router] Updated the Regression Tests and Corresponding Golden Results

Changed `multi_queue_num_threads` and `multi_queue_num_queues` settings
in the CI strong regression tests to avoid QoR failure in the CI runs.

The coverage of the regression tests for parallel connection router
after this change is still fair.

* [vpr][CLI] add generate_net_timing_report

* [vpr][route] remove debugging msg

* [vpr][analysis] add generate_net_timing_report

* [vpr][pack] apply formatting comments

* make format

* [vpr][analysis] add comments

* make format

* [vpr][CLI] remove generate net timing from CLI parameters and generate the report by default

* Unused Packer Options Cleanup (#2976)

* Standardized and renamed packer alpha and beta variable. They are now referred to as timing_gain_weight and connection_gain_weight, used as a weight parameter during timing and connection driven clustering respectively. Removed global_clocks, use_attraction_groups, pack_num_moves, pack_move_type from packer.

* [APPack] Updated Max Candidate Distance Interface

The max candidate distance is used by APPack to decide which molecules
to ignore when packing, based on their distance from the cluster being
formed.

Cleaned up the interface of this by pre-computing the max candidate
distance of all logical blocks ahead of time and reading from these
pre-computed values during packing.

Added a command-line option to allow the user to override some or all of
these max distance thresholds. By default, VPR will select values based
on the type of logical block and the primitives it contains.

Fixed issue with APPack creating too many IO blocks for some circuits
due to the max candidate distance thresholds for IO blocks being too
low.

More tuning should be done on these values once the mass legalizer has
been cleaned up a bit more.

* [vtr][parse] fix pattern for init place wl

* [vpr][analysis] add header for net timing report

* [vpr][analysis] add timing format to comments

* formatting fix

* Revert "[vpr][CLI] remove generate net timing from CLI parameters and generate the report by default"

This reverts commit b8289db.

* make format

* [STA] Generating SDC Commands Post-Implementation

Added an option to have VPR generate an SDC file containing the timing
commands required for an external timing analysis of the post-
implementation netlist to match VPR's timing analysis.

* [STA] Added Tutorial for Post-Implementation Timing Analysis

Created a tutorial demonstrating how OpenSTA can be used after VPR to
perform static timing analysis.

* Add artifact upload to nightly test workflow

* t_det_routing_arch* --> const t_det_routing_arch&

* t_chan_width_dist ---> const t_chan_width_dist&

* make format

* fix compilation error in route_diag by passing det_routing_arch argument by reference instead of pointer

* [task] add generate_net_timing_report to timing report strong test

* [doc] add doc for generating _net_timing_report command line option

* [vpr][timing] update generate_net_timing_report comment

* [vpr][timing] add get_net_bounding_box

* [vpr][timing] add net bounding box to the report

* [test] add test for net timing report

* [doc] update doc with new format to net timing report

* [vpr][analysis] fix net timing report bugs + including layer min/max of bb

* make format

* [vpr][analysis] capture vars by reference in lambda

* [packer] Changing the vector of candidate molecules into LazyPopUniquePriorityQueue.

    The class LazyPopUniquePriorityQueue is a priority queue that allows for lazy deletion of elements.
    It is implemented using a vector and 2 sets, one set keeps track of the elements in the queue, and the other set keeps track of the elements that are pending deletion.
    The queue is sorted by the sort-value(SV) of the elements, and the elements are stored in a vector.
    The set is used to keep track of the elements that are pending deletion, so that they can be removed from the queue when they are popped.
    The class definiation can be found in vpr/src/util/lazy_pop_unique_priority_queue.h

    Currently, the class supports the following functions:
        LazyPopUniquePriorityQueue::push(): Pushes a key-sort-value (K-SV) pair into the priority queue and adds the key to the tracking set.
        LazyPopUniquePriorityQueue::pop(): Returns the K-SV pair with the highest SV whose key is not pending deletion.
        LazyPopUniquePriorityQueue::remove(): Removes an element from the priority queue immediately.
        LazyPopUniquePriorityQueue::remove_at_pop_time(): Removes an element from the priority queue when it is popped.
        LazyPopUniquePriorityQueue::empty(): Returns whether the queue is empty.
        LazyPopUniquePriorityQueue::clear(): Clears the priority queue vector and the tracking sets.
        LazyPopUniquePriorityQueue::size(): Returns the number of elements in the queue.
        LazyPopUniquePriorityQueue::contains(): Returns true if the key is in the queue, false otherwise.

* [packer] recollected golden results for regression basic, basic_odin, strong, strong_odin

* [packer] recollected golden results for Nightly

* add pointer to VTR9 paper in the readme

* Add documentation to explain which parts of VPR are parellel

* pass t_chan_width by reference

* doxygen comment for alloc_and_load_rr_node_indices

* add doxygen comments for load_block_rr_indices()

* [AP][Solver] Enabled Parallel Eigen

The Eigen solver has the ability to use OpenMP to run the solver
computations in parallel. Made the AP flow use the num_workers option to
set the number of threads that Eigen can use.

VPR did not have the ability to build with OpenMP in its CMAKE. Added an
option to the CMAKE to allow the user to enable OpenMP.

* remove unused is_flat argument from alloc_and_load_rr_node_indices() and load_block_rr_indices()

* use (x, y) convention for CHANX instead of (y, x)

* make format

* cast x/y to size_t

* get rid of warnings in RRSpatialLookup::find_nodes()

* Add references to the main VTR papers in the documentation.

* Add link to the VTR 9 paper in the documentation

* Add link to the VTR 9 paper in the README

* add a closing ) to the text printed by node_coordinate_to_string()

* fix the x/y mismatch for CHANX nodes in rr_nodes and rr_node_indices

* reserve nodes using x/y instead of chan/seg

* fix a typo

* add rr_graph_genearion directory

* resize node lookup for CHANX nodes in RR graph serializer

* add rr_node_indices.cpp/.h

* add doxygen comment for load_chan_rr_indices()

* [Infra] Updated Install Packages Script For Backwards Compatibility

The install_apt_packages.sh script is no longer backward compatible with
older versions of Ubuntu due to the dependency on clang-format-18.

Added an if statement to check if the distribution can support
clang-format-18 and only installing it if it can.

Added this script to the CI build process so it can always be tested
within the CI to prevent future regression.

* [RegTest] Disabled `strong_multiclock` test for parallel connection router

Temporarily disabled the `strong_multiclock` test in `vtr_reg_strong` CI
regression tests for the parallel connection router, due to some random
failures as mentioned in Issue #3029.

After fixing the problem with the `strong_multiclock` test, this will be
reactivated.

* [doc] update the doc with new report format

* [RegTest] Updated golden results for `strong_multiclock` regression test

Removed the golden results of parallel connection router test cases for
`strong_multiclock` regression test.

* [vpr][analysis] use std::min/max instead of if condition

* Add documentation for include sanitization

* [vpr][analysis] change report_net_timing format to csv

* [vpr][analysis] update comments

* [vpr][analysis] print constant nets in  the net timing report

* [vpr][analysis] apply comments

* [vpr][analysis] fix function name

* [doc] add net timing report use case

* fix a typo

* [Infra] Cleaned Up Include Files in VPR Base Directory

Many include files in the base directory contained includes to other
headers which they do not use. This causes many CPP files to include way
more header files than they need, increasing the incremental build time.

This process needs to be done on the entire VTR repo, but I found that
the base directory was one of the biggest culprits of this and the
hardest to untangle.

* [Infra] Cleaned Up Header Files in Pack Folder

Went through the header files in the pack folder and resolved any unused
header files.

* [AP] Removed Old Cluster-Level AP Flow

Prior to the flat AP flow, a cluster-level AP flow existed in VPR which
performed a SimPL-style algorithm on the clusters created during packing
before performing a placement quench.

Although well-written, this flow was not shown to outperform the SA
placer in VPR. It has also been becoming confusing to keep in VPR since
the new flat AP flow supercedes it. It is unclear if a cluster-level AP
flow will work well with the flat AP flow; however in that case the
cluster-level AP flow would be made using the new AP APIs written.

Removed the old cluster-level AP flow to reduce confusion.

* [Infra] Cleaned Up Header Files in Place Folder

* [lib][rr_graph] replace t_rr_type with e_rr_type

* [vpr][tileable] remove t_rr_type usage

* make is_io_type() a member function of t_physical_tile_type

* replace calls to is_io_type() with t_physical_tile_type::is_io()

* make format

* fix compiler bugs

* make format

* [lib][libutil] fix size_t issue

* inline  t_physical_tile_type::is_io()

* add doxygen comments for alloc_and_load_tile_rr_node_indices()

* [libs][vtrutil] use generate instead of fill to avoid getting potential null pointer dereference

* document alloc_and_load_rr_node_indices() arguments

* made a few function operating on t_pb_type its member functions

* add router_lookahead directory

* [STA] Added Multiclock Incremental STA Consistency Check

The incremental STA consistency coverage was very good, but was just
missing a multiclock circuit with an SDC file.

Added a quick test.

* [libs][rr_graph] don't reverse xy when calling node lookup

* [vpr][util] consider medium node type as inter cluster node

---------

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: AlexandreSinger <[email protected]>
Co-authored-by: Fahrican Kosar <[email protected]>
Co-authored-by: AlexandreSinger <[email protected]>
Co-authored-by: Hang Yan <[email protected]>
Co-authored-by: Fred Tombs <[email protected]>
Co-authored-by: soheilshahrouz <[email protected]>
Co-authored-by: Soheil Shahrouz <[email protected]>
Co-authored-by: Amir Poolad <[email protected]>
Co-authored-by: Amir Poolad <[email protected]>
Co-authored-by: vaughnbetz <[email protected]>
Co-authored-by: Fred Tombs <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: James Yen <[email protected]>
Co-authored-by: Rongbo Zhang <[email protected]>
Co-authored-by: Rongbo Zhang <[email protected]>
Co-authored-by: Mohamed Elgammal <[email protected]>

Author: 13 people

.github/scripts/install_dependencies.sh

@@ -2,40 +2,32 @@
 
 sudo apt update
 
+# Required packages specifically for the CI and not VTR in general.
 sudo apt install -y \
   autoconf \
   automake \
   bash \
-  bison \
   binutils \
   binutils-gold \
-  build-essential \
   capnproto \
   exuberant-ctags \
   curl \
   doxygen \
-  flex \
   fontconfig \
   gdb \
-  git \
   gperf \
   libcairo2-dev \
   libcapnp-dev \
-  libgtk-3-dev \
   libevent-dev \
   libfontconfig1-dev \
   liblist-moreutils-perl \
   libncurses5-dev \
-  libx11-dev \
   libxft-dev \
   libxml2-utils \
   libxml++2.6-dev \
-  libreadline-dev \
   tcllib \
   tcl8.6-dev \
-  libffi-dev \
   perl \
-  pkg-config \
   texinfo \
   time \
   valgrind \
@@ -54,10 +46,10 @@ sudo apt install -y \
   clang-15 \
   clang-16 \
   clang-17 \
-  clang-18 \
-  clang-format-18 \
-  libtbb-dev \
-  openssl
+  clang-18
+
+# Standard packages install script.
+./install_apt_packages.sh
 
 pip install -r requirements.txt
 

.github/scripts/install_jammy_dependencies.sh

@@ -2,40 +2,32 @@
 
 sudo apt update
 
+# Required packages specifically for the CI and not VTR in general.
 sudo apt install -y \
   autoconf \
   automake \
   bash \
-  bison \
   binutils \
   binutils-gold \
-  build-essential \
   capnproto \
   exuberant-ctags \
   curl \
   doxygen \
-  flex \
   fontconfig \
   gdb \
-  git \
   gperf \
   libcairo2-dev \
   libcapnp-dev \
-  libgtk-3-dev \
   libevent-dev \
   libfontconfig1-dev \
   liblist-moreutils-perl \
   libncurses5-dev \
-  libx11-dev \
   libxft-dev \
   libxml2-utils \
   libxml++2.6-dev \
-  libreadline-dev \
   tcllib \
   tcl8.6-dev \
-  libffi-dev \
   perl \
-  pkg-config \
   texinfo \
   time \
   valgrind \
@@ -50,9 +42,10 @@ sudo apt install -y \
   g++-11 \
   gcc-11 \
   g++-12 \
-  gcc-12 \
-  clang-format-14 \
-  libtbb-dev
+  gcc-12
+
+# Standard packages install script.
+./install_apt_packages.sh
 
 pip install -r requirements.txt
 

.github/workflows/nightly_test_manual.yml

@@ -104,3 +104,12 @@ jobs:
       run: |
         source .venv/bin/activate
         ./run_reg_test.py -j12 vtr_reg_nightly_test7
+
+    - name: Upload regression results
+      if: success() || failure()
+      uses: actions/upload-artifact@v4
+      with:
+        name: nightly_test_results
+        path: |
+          vtr_flow/**/*.log
+          vtr_flow/**/parse_results*.txt

.github/workflows/stale.yml

@@ -10,6 +10,11 @@ jobs:
     steps:
       - uses: actions/stale@v9
         with:
+          # Set default number of days before being marked stale to 100 years
+          # This will be overriden by "days-before-issue-stale" and "days-before-pr-stale"
+          # This is done to avoid marking PRs as stale, as it is not something
+          # we want to do.
+          days-before-stale: 36500
           # The message to be shown for stale issues
           stale-issue-message: 'This issue has been inactive for a year and has been marked as stale. It will be closed in 15 days if it continues to be stale. If you believe this is still an issue, please add a comment.'
           close-issue-message: 'This issue has been marked stale for 15 days and has been automatically closed.'
@@ -20,6 +25,11 @@ jobs:
           # Start from the oldest issues
           ascending: true
 
+          # Upper limit for number of API calls per day
+          # This worklfow does 2-3 API calls per issue
+          # including issues that have been marked stale
+          operations-per-run: 300
+
           # The configuration below can be used to allow the same behaviour with PRs.
           # Since we currently don't want to close old PRs, it is commented out but 
           # left here in case we change our mind.

CMakeLists.txt

@@ -43,9 +43,6 @@ option(VTR_ENABLE_CAPNPROTO "Enable capnproto binary serialization support in VP
 #Allow the user to decide whether to compile the server module
 option(VPR_USE_SERVER "Specify whether vpr enables the server mode" ON)
 
-#Allow the user to enable/disable VPR analytic placement
-#VPR option --enable_analytic_placer is also required for Analytic Placement
-option(VPR_ANALYTIC_PLACE "Enable analytic placement in VPR." ON)
 option(VPR_ENABLE_INTERCHANGE "Enable FPGA interchange." ON)
 option(VPR_ENABLE_NOC_SAT_ROUTING "Enable NoC SAT routing." OFF)
 

Dockerfile

@@ -1,25 +1,25 @@
-FROM ubuntu:22.04
+FROM ubuntu:24.04
 ARG DEBIAN_FRONTEND=noninteractive
 # set out workspace
 ENV WORKSPACE=/workspace
 RUN mkdir -p ${WORKSPACE}
 WORKDIR ${WORKSPACE}
 COPY . ${WORKSPACE}
+# Required to bypass Python's protection on system-wide package installations in Ubuntu 23.04+.
+# This allows pip to install packages globally without using a virtual environment.
+ENV PIP_BREAK_SYSTEM_PACKAGES=1
 # Install and cleanup is done in one command to minimize the build cache size
 RUN apt-get update -qq \
 # Extract package names from install_apt_packages.sh
-    && sed '/sudo/d' install_apt_packages.sh | sed '/#/d' | sed 's/ \\//g' | sed '/^$/d' | sed '/^[[:space:]]*$/d' \
+    && sed '/sudo/d' install_apt_packages.sh | sed '/#/d' | sed '/if\s.*then$/d' | sed '/else$/d' | sed '/fi$/d' | sed '/echo\s/d' | sed 's/ \\//g' | sed '/^$/d' | sed '/^[[:space:]]*$/d' | sed 's/\s//g' \
 # Install packages
     | xargs apt-get -y install --no-install-recommends \
 # Additional packages not listed in install_apt_packages.sh
     && apt-get -y install --no-install-recommends \
     wget \
     ninja-build \
-    default-jre \
     libeigen3-dev \
-    libtbb-dev \
     python3-pip \
-    git \
     time \
 # Install python packages
     && pip install -r requirements.txt \
@@ -29,4 +29,4 @@ RUN apt-get update -qq \
 # Build VTR
 RUN rm -rf build && make -j$(nproc) && make install
 # Container's default launch command
-SHELL ["/bin/bash", "-c"]
+SHELL ["/bin/bash", "-c"]

README.developers.md

@@ -179,6 +179,29 @@ For large scale reformatting (should only be performed by VTR maintainers) the s
 
 Python files are automatically checked using `pylint` to ensure they follow established Python conventions.  You can run `pylint` on the entire repository by running `./dev/pylint_check.py`.  Certain files which were created before we adopted Python lint checking are grandfathered and are not checked.  To check *all* files, provide the `--check_grandfathered` argument.  You can also manually check individual files using `./dev/pylint_check.py <path_to_file1> <path_to_file2> ...`.
 
+# Sanitizing Includes
+
+You can use include-what-you-use or the clangd language server to make sure includes are correct and you don't have missing or unused includes.
+
+## include-what-you-use
+
+First, install include-what-you-use. Ubuntu/Debian users can run `sudo apt install iwyu` and Fedora/RHEL users can run `sudo dnf install iwyu`. You can then compile VTR with include-what-you-use enabled to get diagnostic messages about includes in all files with the following command:
+
+```
+make CMAKE_PARAMS="-DCMAKE_CXX_INCLUDE_WHAT_YOU_USE=include-what-you-use"
+```
+
+Note that this method checks all source files and the diagnostic messages can be very long.
+
+## clangd language server
+
+Alternatively, if your editor supports clangd, you can use it to get diagnostic messages for the specific file you are working with. Visual Studio Code users can use the clangd extension to use clangd instead of Microsoft's C/C++ extension. To enable include diagnostics, create a file named `.clangd` in VTR root directory and add the following lines to it:
+```
+Diagnostics:
+  UnusedIncludes: Strict
+  MissingIncludes: Strict
+```
+
 # Running Tests
 
 VTR has a variety of tests which are used to check for correctness, performance and Quality of Result (QoR).

README.md

@@ -36,15 +36,15 @@ See the [full license](LICENSE.md) for details.
 ## How to Cite
 The following paper may be used as a general citation for VTR:
 
-K. E. Murray, O. Petelin, S. Zhong, J. M. Wang, M. ElDafrawy, J.-P. Legault, E. Sha, A. G. Graham, J. Wu, M. J. P. Walker, H. Zeng, P. Patros, J. Luu, K. B. Kent and V. Betz "VTR 8: High Performance CAD and Customizable FPGA Architecture Modelling", ACM TRETS, 2020.
+M. A. Elgammal, A. Mohaghegh, S. G. Shahrouz, F. Mahmoudi, F. Kosar, K. Talaei, J. Fife, D. Khadivi, K. Murray, A. Boutros, K. B. Kent, J. Goeders, and V. Betz "VTR 9: Open-Source CAD for Fabric and Beyond FPGA Architecture Exploration", ACM TRETS, 2025. [PDF](https://dl.acm.org/doi/epdf/10.1145/3734798)
 
 Bibtex:
 ```
-@article{vtr8,
-  title={VTR 8: High Performance CAD and Customizable FPGA Architecture Modelling},
-  author={Murray, Kevin E. and Petelin, Oleg and Zhong, Sheng and Wang, Jai Min and ElDafrawy, Mohamed and Legault, Jean-Philippe and Sha, Eugene and Graham, Aaron G. and Wu, Jean and Walker, Matthew J. P. and Zeng, Hanqing and Patros, Panagiotis and Luu, Jason and Kent, Kenneth B. and Betz, Vaughn},
+@article{vtr9,
+  title={VTR 9: Open-Source CAD for Fabric and Beyond FPGA Architecture Exploration},
+  author={Elgammal, Mohamed A. and Mohaghegh, Amin and Shahrouz, Soheil G. and Mahmoudi, Fatemehsadat and Kosar, Fahrican and Talaei, Kimia and Fife, Joshua and Khadivi, Daniel and Murray, Kevin and Boutros, Andrew and Kent, Kenneth B. and Goeders, Jeff and Betz, Vaughn},
   journal={ACM Trans. Reconfigurable Technol. Syst.},
-  year={2020}
+  year={2025}
 }
 ```
 

doc/src/api/vprinternals/router_connection_router.rst

@@ -0,0 +1,18 @@
+==========
+Connection Router
+==========
+
+ConnectionRouter
+---------
+.. doxygenfile:: connection_router.h
+   :project: vpr
+
+SerialConnectionRouter
+----------
+.. doxygenclass:: SerialConnectionRouter
+   :project: vpr
+
+ParallelConnectionRouter
+----------
+.. doxygenclass:: ParallelConnectionRouter
+   :project: vpr

doc/src/api/vprinternals/vpr_router.rst

@@ -9,3 +9,4 @@ VPR Router
 
    router_heap
    router_lookahead
+   router_connection_router

doc/src/api/vtrutil/containers.rst

@@ -8,6 +8,12 @@ vtr_vector
    :project: vtr
    :sections: briefdescription detaileddescription innernamespace innerclass public-func typedef func
 
+vtr_array
+----------
+.. doxygenfile:: vtr_array.h
+   :project: vtr
+   :sections: briefdescription detaileddescription innernamespace innerclass public-func typedef func
+
 vtr_small_vector
 ----------------
 .. doxygenclass:: vtr::small_vector

doc/src/quickstart/index.rst

@@ -23,8 +23,23 @@ If you cloned the repository, you will need to set up the git submodules (if you
 
     > git submodule init
     > git submodule update
-    
-VTR requires several system packages and Python packages to build and run the flow. Ubuntu users can install the required system packages using the following command (this works on Ubuntu 18.04, 20.04, 22.04 and 24.04, but you may require different packages on other Linux distributions). Our CI testing is on Ubuntu 24.04, so that is the best tested platform and recommended for development.
+
+VTR requires several system and Python packages to build and run the flow. Ubuntu users can install the required system packages using the provided script or the command below. This setup works on Ubuntu 18.04, 20.04, 22.04, and 24.04, but note that some packages (such as ``clang-format-18``) are only available by default on Ubuntu 24.04. On older versions, this package will not be installed unless you manually add the appropriate LLVM APT repository.
+
+To install ``clang-format-18`` on older Ubuntu versions (e.g., 20.04 or 22.04), you must add the LLVM repository manually. Note that this tool is only required if you want to run ``make format`` to automatically fix formatting issues in the code. It is not necessary for building or running VPR.
+
+.. code-block:: bash
+
+   sudo apt install wget gnupg lsb-release
+   wget https://apt.llvm.org/llvm.sh
+   chmod +x llvm.sh
+   sudo ./llvm.sh 18
+
+After that, you can install ``clang-format-18`` using:
+
+.. code-block:: bash
+
+   sudo apt install clang-format-18
 
 .. code-block:: bash
 

doc/src/tutorials/index.rst

@@ -10,3 +10,4 @@ Tutorials
     arch/index
     titan_benchmarks/index
     timing_simulation/index
+    timing_analysis/index