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GRT uses layers below the bottom routing layer in repair antennas
Describe the bug
I have the following case where GRT uses a long M1 guide for a net. This happens in the first iteration of repair antenna flow:
This is causing failures in a ci run for my branch which introduces errors when such a guide is present. The error is: [ERROR DRT-0155] Guide in net 01412 uses layer li1 (2) that is outside the allowed routing range [met1 (4), met5 (12)] with via access on [li1 (2)].
Expected Behavior
GRT to follow the signal layer constraints post drt.
Environment
[WARNING] Your current OpenROAD version is outdated.
It is recommened to pull the latest changes.
If problem persists, file a github issue with the re-producible test case.
kernel: Linux 6.8.0-60-generic
os: Ubuntu 22.04.5 LTS (Jammy Jellyfish)
cmake version 3.24.2
-- The CXX compiler identification is GNU 11.4.0
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++ - skipped
-- Detecting CXX compile features
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-- OpenROAD version: v2.0-22112-g5ffc612b38
-- System name: Linux
-- Compiler: GNU 11.4.0
-- Build type: RELEASE
-- Install prefix: /usr/local
-- C++ Standard: 17
-- C++ Standard Required: ON
-- C++ Extensions: OFF
-- The C compiler identification is GNU 11.4.0
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /usr/bin/cc - skipped
-- Detecting C compile features
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-- Found Python3: /usr/bin/python3.10 (found version "3.10.12") found components: Interpreter
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD
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-- Found Threads: TRUE
-- TCL library: /usr/lib/x86_64-linux-gnu/libtcl.so
-- TCL header: /usr/include/tcl/tcl.h
-- TCL readline library: /usr/lib/x86_64-linux-gnu/libtclreadline.so
-- TCL readline header: /usr/include/x86_64-linux-gnu
-- Found SWIG: /usr/local/bin/swig (found suitable version "4.1.0", minimum required is "4.0")
-- Using SWIG >= 4.1.0 -flatstaticmethod flag for python
-- Found Boost: /usr/local/lib/cmake/Boost-1.87.0/BoostConfig.cmake (found version "1.87.0") found components: iostreams
-- boost: 1.87.0
-- Found GTest: /usr/local/lib/cmake/GTest/GTestConfig.cmake (found version "1.13.0")
-- GTest: 1.13.0
-- Found Python3: /usr/include/python3.10 (found version "3.10.12") found components: Development Development.Module Development.Embed
-- Found ZLIB: /usr/lib/x86_64-linux-gnu/libz.so (found version "1.2.11")
-- spdlog: 1.8.1
-- Found BISON: /usr/bin/bison (found version "3.8.2")
-- Could NOT find Doxygen (missing: DOXYGEN_EXECUTABLE)
-- STA version: 2.7.0
-- STA git sha: ffabd65e39f036b9eb511d3b9d9887772d56e72b
-- System name: Linux
-- Compiler: GNU 11.4.0
-- Build type: RELEASE
-- Build CXX_FLAGS: -O3 -DNDEBUG
-- Install prefix: /usr/local
-- Found FLEX: /usr/bin/flex (found version "2.6.4")
-- TCL library: /usr/lib/x86_64-linux-gnu/libtcl.so
-- TCL header: /usr/include/tcl/tcl.h
-- TCL readline library: /usr/lib/x86_64-linux-gnu/libtclreadline.so
-- TCL readline header: /usr/include/x86_64-linux-gnu/tclreadline.h
-- CUDD library: /usr/local/lib/libcudd.a
-- CUDD header: /usr/local/include/cudd.h
-- SSTA: 0
-- Found SWIG: /usr/local/bin/swig (found suitable version "4.1.0", minimum required is "3.0")
-- STA library: /tmp/tmp.A9jSJLC3UD/libOpenSTA.a
-- STA executable: /tmp/tmp.A9jSJLC3UD/sta
-- Found re2: /opt/or-tools/lib/cmake/re2/re2Config.cmake (found version "11.0.0")
-- Found Clp: /opt/or-tools/lib/cmake/Clp/ClpConfig.cmake (found version "1.17.7")
-- Found Cbc: /opt/or-tools/lib/cmake/Cbc/CbcConfig.cmake (found version "2.10.7")
-- Found SCIP: /opt/or-tools/lib/cmake/scip/scip-config.cmake (found version "9.0.0")
-- Found OpenMP_CXX: -fopenmp (found version "4.5")
-- Found OpenMP: TRUE (found version "4.5")
-- Found OR-Tools: /opt/or-tools/lib/cmake/ortools (version: 9.10.4067)
-- TCL library: /usr/lib/x86_64-linux-gnu/libtcl.so
-- TCL header: /usr/include/tcl/tcl.h
-- Found Boost: /usr/local/lib/cmake/Boost-1.87.0/BoostConfig.cmake (found version "1.87.0")
-- Found OpenMP_C: -fopenmp (found version "4.5")
-- Found OpenMP: TRUE (found version "4.5")
-- Found OpenMP: TRUE (found version "4.5")
-- GUI is enabled
-- Found Boost: /usr/local/lib/cmake/Boost-1.87.0/BoostConfig.cmake (found version "1.87.0") found components: serialization
-- Could NOT find VTune (missing: VTune_LIBRARIES VTune_INCLUDE_DIRS)
-- Found Boost: /usr/local/lib/cmake/Boost-1.87.0/BoostConfig.cmake (found suitable version "1.87.0", minimum required is "1.78")
-- TCL library: /usr/lib/x86_64-linux-gnu/libtcl.so
-- TCL header: /usr/include/tcl/tcl.h
-- Found Boost: /usr/local/lib/cmake/Boost-1.87.0/BoostConfig.cmake (found version "1.87.0") found components: serialization system thread
-- Found Boost: /usr/local/lib/cmake/Boost-1.87.0/BoostConfig.cmake (found version "1.87.0")
-- Found Eigen3: /usr/local/share/eigen3/cmake/Eigen3Config.cmake (found version "3.4.0")
-- TCL readline enabled
-- Tcl Extended disabled
-- Python3 enabled
-- Configuring done
-- Generating done
-- Build files have been written to: /tmp/tmp.A9jSJLC3UD
To Reproduce
git checkout 5ffc612 and run ibex_sky130hs test
Relevant log output
Screenshots
No response
Additional Context
No response
@osamahammad21 I believe this issue is caused by DRT. repair_antennas is not touching this net, and GRT is not rerouting it. However, we are calling DRT with the -save_guide_updates, and this is causing the li1 segment. If I remove this flag, the repair_antennas flow ends with no errors.
EDIT: notice that we don't use this flag in the ORFS, so this issue shouldn't happen in a secure-CI run.
@eder-matheus got it and removed that flag in the flow test. However, I find that the same issue is happening in ORFS. In design nangate45/swerv_wrapper.
This happens at the first detailed routing attempt, so DRT does not even touch the guides at this point.
https://jenkins.openroad.tools/blue/organizations/jenkins/OpenROAD-flow-scripts-Private/detail/secure-TR-via-access-layer/6/pipeline
sky130hd/microwatt antenna repair flow:
[ERROR DRT-0155] Guide in net net56035 uses layer li1 (2) that is outside the allowed routing range [met1 (4), met5 (12)] with via access on [li1 (2)].