[llvm] [LLVM][MC][DecoderEmitter] Add support to specialize decoder per bitwidth (PR #154865)

Tue Sep 2 02:58:30 PDT 2025

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `amdgpu-offload-rhel-8-cmake-build-only` running on `rocm-docker-rhel-8` while building `llvm` at step 4 "annotate".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/204/builds/20593

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 4 (annotate) failure: '../llvm-zorg/zorg/buildbot/builders/annotated/amdgpu-offload-cmake.py --jobs=32' (failure)
...
[7394/8050] Linking CXX shared library lib/libMLIRNVGPUToNVVM.so.22.0git
[7395/8050] Creating library symlink lib/libMLIRNVGPUToNVVM.so
[7396/8050] Linking CXX shared library lib/libMLIRSCFToGPU.so.22.0git
[7397/8050] Creating library symlink lib/libMLIRSCFToGPU.so
[7398/8050] Building CXX object tools/flang/lib/Optimizer/Builder/CMakeFiles/FIRBuilder.dir/LowLevelIntrinsics.cpp.o
[7399/8050] Building CXX object tools/flang/lib/Optimizer/Builder/CMakeFiles/FIRBuilder.dir/Complex.cpp.o
[7400/8050] Linking CXX shared library lib/libMLIRGPUTransformOps.so.22.0git
[7401/8050] Creating library symlink lib/libMLIRGPUTransformOps.so
[7402/8050] Building CXX object tools/flang/lib/Evaluate/CMakeFiles/FortranEvaluate.dir/cmake_pch.hxx.gch
[7403/8050] Building CXX object lib/Target/AMDGPU/Disassembler/CMakeFiles/LLVMAMDGPUDisassembler.dir/AMDGPUDisassembler.cpp.o
FAILED: lib/Target/AMDGPU/Disassembler/CMakeFiles/LLVMAMDGPUDisassembler.dir/AMDGPUDisassembler.cpp.o 
ccache /usr/bin/c++ -DGTEST_HAS_RTTI=0 -DLLVM_EXPORTS -D_DEBUG -D_GLIBCXX_ASSERTIONS -D_GLIBCXX_USE_CXX11_ABI=1 -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/home/botworker/bbot/amdgpu-offload-rhel-8-cmake-build-only/build/lib/Target/AMDGPU/Disassembler -I/home/botworker/bbot/amdgpu-offload-rhel-8-cmake-build-only/llvm-project/llvm/lib/Target/AMDGPU/Disassembler -I/home/botworker/bbot/amdgpu-offload-rhel-8-cmake-build-only/llvm-project/llvm/lib/Target/AMDGPU -I/home/botworker/bbot/amdgpu-offload-rhel-8-cmake-build-only/build/lib/Target/AMDGPU -I/home/botworker/bbot/amdgpu-offload-rhel-8-cmake-build-only/build/include -I/home/botworker/bbot/amdgpu-offload-rhel-8-cmake-build-only/llvm-project/llvm/include -I/home/botworker/bbot/amdgpu-offload-rhel-8-cmake-build-only/build/lib/Target/AMDGPU/Disassembler/.. -I/home/botworker/bbot/amdgpu-offload-rhel-8-cmake-build-only/llvm-project/llvm/lib/Target/AMDGPU/Disassembler/.. -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wno-missing-field-initializers -pedantic -Wno-long-long -Wimplicit-fallthrough -Wno-uninitialized -Wno-nonnull -Wno-class-memaccess -Wno-noexcept-type -Wdelete-non-virtual-dtor -Wno-comment -Wno-misleading-indentation -fdiagnostics-color -ffunction-sections -fdata-sections -O3 -DNDEBUG -std=c++17 -fPIC  -fno-exceptions -funwind-tables -fno-rtti -UNDEBUG -MD -MT lib/Target/AMDGPU/Disassembler/CMakeFiles/LLVMAMDGPUDisassembler.dir/AMDGPUDisassembler.cpp.o -MF lib/Target/AMDGPU/Disassembler/CMakeFiles/LLVMAMDGPUDisassembler.dir/AMDGPUDisassembler.cpp.o.d -o lib/Target/AMDGPU/Disassembler/CMakeFiles/LLVMAMDGPUDisassembler.dir/AMDGPUDisassembler.cpp.o -c /home/botworker/bbot/amdgpu-offload-rhel-8-cmake-build-only/llvm-project/llvm/lib/Target/AMDGPU/Disassembler/AMDGPUDisassembler.cpp
/home/botworker/bbot/amdgpu-offload-rhel-8-cmake-build-only/llvm-project/llvm/lib/Target/AMDGPU/Disassembler/AMDGPUDisassembler.cpp:451: error: explicit template specialization cannot have a storage class
 template <> static constexpr uint32_t llvm::MCD::InsnBitWidth<uint32_t> = 32;

/home/botworker/bbot/amdgpu-offload-rhel-8-cmake-build-only/llvm-project/llvm/lib/Target/AMDGPU/Disassembler/AMDGPUDisassembler.cpp:452: error: explicit template specialization cannot have a storage class
 template <> static constexpr uint32_t llvm::MCD::InsnBitWidth<uint64_t> = 64;

/home/botworker/bbot/amdgpu-offload-rhel-8-cmake-build-only/llvm-project/llvm/lib/Target/AMDGPU/Disassembler/AMDGPUDisassembler.cpp:454: error: explicit template specialization cannot have a storage class
 static constexpr uint32_t llvm::MCD::InsnBitWidth<std::bitset<96>> = 96;

/home/botworker/bbot/amdgpu-offload-rhel-8-cmake-build-only/llvm-project/llvm/lib/Target/AMDGPU/Disassembler/AMDGPUDisassembler.cpp:456: error: explicit template specialization cannot have a storage class
 static constexpr uint32_t llvm::MCD::InsnBitWidth<std::bitset<128>> = 128;

[7404/8050] Building CXX object tools/flang/lib/Optimizer/Builder/CMakeFiles/FIRBuilder.dir/DoLoopHelper.cpp.o
[7405/8050] Linking CXX shared library lib/libMLIRGPUPipelines.so.22.0git
[7406/8050] Linking CXX shared library lib/libMLIRCAPIGPU.so.22.0git
[7407/8050] Linking CXX shared library lib/libMLIRNVGPUTransformOps.so.22.0git
[7408/8050] Linking CXX shared library lib/libMLIRSparseTensorPipelines.so.22.0git
[7409/8050] Building CXX object tools/flang/lib/Optimizer/Builder/CMakeFiles/FIRBuilder.dir/Runtime/CUDA/Descriptor.cpp.o
[7410/8050] Building CXX object tools/flang/lib/Optimizer/Builder/CMakeFiles/FIRBuilder.dir/Runtime/Derived.cpp.o
[7411/8050] Building CXX object tools/flang/unittests/Evaluate/CMakeFiles/intrinsics.test.dir/intrinsics.cpp.o
[7412/8050] Building CXX object tools/flang/lib/Optimizer/Builder/CMakeFiles/FIRBuilder.dir/Runtime/Command.cpp.o
[7413/8050] Building CXX object tools/flang/lib/Optimizer/Builder/CMakeFiles/FIRBuilder.dir/Runtime/Allocatable.cpp.o
[7414/8050] Building CXX object tools/flang/lib/Optimizer/Builder/CMakeFiles/FIRBuilder.dir/Runtime/ArrayConstructor.cpp.o
[7415/8050] Building CXX object tools/flang/lib/Optimizer/Builder/CMakeFiles/FIRBuilder.dir/BoxValue.cpp.o
[7416/8050] Building CXX object tools/flang/lib/Optimizer/Builder/CMakeFiles/FIRBuilder.dir/MutableBox.cpp.o
[7417/8050] Building CXX object tools/flang/lib/Optimizer/Builder/CMakeFiles/FIRBuilder.dir/Runtime/Assign.cpp.o
[7418/8050] Building CXX object tools/flang/lib/Optimizer/Builder/CMakeFiles/FIRBuilder.dir/Runtime/Character.cpp.o
[7419/8050] Building CXX object tools/flang/lib/Optimizer/Analysis/CMakeFiles/FIRAnalysis.dir/TBAAForest.cpp.o
[7420/8050] Building CXX object tools/flang/lib/Parser/CMakeFiles/FortranParser.dir/cmake_pch.hxx.gch
[7421/8050] Building CXX object tools/flang/lib/Utils/CMakeFiles/FortranUtils.dir/OpenMP.cpp.o
[7422/8050] Building CXX object tools/flang/lib/Optimizer/Builder/CMakeFiles/FIRBuilder.dir/Character.cpp.o
[7423/8050] Building CXX object tools/flang/unittests/Evaluate/CMakeFiles/expression.test.dir/expression.cpp.o
[7424/8050] Building CXX object tools/flang/lib/Optimizer/Analysis/CMakeFiles/FIRAnalysis.dir/AliasAnalysis.cpp.o
[7425/8050] Building CXX object tools/flang/lib/Optimizer/Builder/CMakeFiles/FIRBuilder.dir/HLFIRTools.cpp.o
[7426/8050] Building CXX object tools/flang/unittests/Evaluate/CMakeFiles/folding.test.dir/folding.cpp.o
[7427/8050] Building CXX object tools/flang/lib/Optimizer/Builder/CMakeFiles/FIRBuilder.dir/FIRBuilder.cpp.o
[7428/8050] Building CXX object tools/flang/lib/Optimizer/Builder/CMakeFiles/FIRBuilder.dir/CUFCommon.cpp.o
Step 7 (build cmake config) failure: build cmake config (failure)
...
[7394/8050] Linking CXX shared library lib/libMLIRNVGPUToNVVM.so.22.0git
[7395/8050] Creating library symlink lib/libMLIRNVGPUToNVVM.so
[7396/8050] Linking CXX shared library lib/libMLIRSCFToGPU.so.22.0git
[7397/8050] Creating library symlink lib/libMLIRSCFToGPU.so
[7398/8050] Building CXX object tools/flang/lib/Optimizer/Builder/CMakeFiles/FIRBuilder.dir/LowLevelIntrinsics.cpp.o
[7399/8050] Building CXX object tools/flang/lib/Optimizer/Builder/CMakeFiles/FIRBuilder.dir/Complex.cpp.o
[7400/8050] Linking CXX shared library lib/libMLIRGPUTransformOps.so.22.0git
[7401/8050] Creating library symlink lib/libMLIRGPUTransformOps.so
[7402/8050] Building CXX object tools/flang/lib/Evaluate/CMakeFiles/FortranEvaluate.dir/cmake_pch.hxx.gch
[7403/8050] Building CXX object lib/Target/AMDGPU/Disassembler/CMakeFiles/LLVMAMDGPUDisassembler.dir/AMDGPUDisassembler.cpp.o
FAILED: lib/Target/AMDGPU/Disassembler/CMakeFiles/LLVMAMDGPUDisassembler.dir/AMDGPUDisassembler.cpp.o 
ccache /usr/bin/c++ -DGTEST_HAS_RTTI=0 -DLLVM_EXPORTS -D_DEBUG -D_GLIBCXX_ASSERTIONS -D_GLIBCXX_USE_CXX11_ABI=1 -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/home/botworker/bbot/amdgpu-offload-rhel-8-cmake-build-only/build/lib/Target/AMDGPU/Disassembler -I/home/botworker/bbot/amdgpu-offload-rhel-8-cmake-build-only/llvm-project/llvm/lib/Target/AMDGPU/Disassembler -I/home/botworker/bbot/amdgpu-offload-rhel-8-cmake-build-only/llvm-project/llvm/lib/Target/AMDGPU -I/home/botworker/bbot/amdgpu-offload-rhel-8-cmake-build-only/build/lib/Target/AMDGPU -I/home/botworker/bbot/amdgpu-offload-rhel-8-cmake-build-only/build/include -I/home/botworker/bbot/amdgpu-offload-rhel-8-cmake-build-only/llvm-project/llvm/include -I/home/botworker/bbot/amdgpu-offload-rhel-8-cmake-build-only/build/lib/Target/AMDGPU/Disassembler/.. -I/home/botworker/bbot/amdgpu-offload-rhel-8-cmake-build-only/llvm-project/llvm/lib/Target/AMDGPU/Disassembler/.. -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wno-missing-field-initializers -pedantic -Wno-long-long -Wimplicit-fallthrough -Wno-uninitialized -Wno-nonnull -Wno-class-memaccess -Wno-noexcept-type -Wdelete-non-virtual-dtor -Wno-comment -Wno-misleading-indentation -fdiagnostics-color -ffunction-sections -fdata-sections -O3 -DNDEBUG -std=c++17 -fPIC  -fno-exceptions -funwind-tables -fno-rtti -UNDEBUG -MD -MT lib/Target/AMDGPU/Disassembler/CMakeFiles/LLVMAMDGPUDisassembler.dir/AMDGPUDisassembler.cpp.o -MF lib/Target/AMDGPU/Disassembler/CMakeFiles/LLVMAMDGPUDisassembler.dir/AMDGPUDisassembler.cpp.o.d -o lib/Target/AMDGPU/Disassembler/CMakeFiles/LLVMAMDGPUDisassembler.dir/AMDGPUDisassembler.cpp.o -c /home/botworker/bbot/amdgpu-offload-rhel-8-cmake-build-only/llvm-project/llvm/lib/Target/AMDGPU/Disassembler/AMDGPUDisassembler.cpp
/home/botworker/bbot/amdgpu-offload-rhel-8-cmake-build-only/llvm-project/llvm/lib/Target/AMDGPU/Disassembler/AMDGPUDisassembler.cpp:451: error: explicit template specialization cannot have a storage class
 template <> static constexpr uint32_t llvm::MCD::InsnBitWidth<uint32_t> = 32;

/home/botworker/bbot/amdgpu-offload-rhel-8-cmake-build-only/llvm-project/llvm/lib/Target/AMDGPU/Disassembler/AMDGPUDisassembler.cpp:452: error: explicit template specialization cannot have a storage class
 template <> static constexpr uint32_t llvm::MCD::InsnBitWidth<uint64_t> = 64;

/home/botworker/bbot/amdgpu-offload-rhel-8-cmake-build-only/llvm-project/llvm/lib/Target/AMDGPU/Disassembler/AMDGPUDisassembler.cpp:454: error: explicit template specialization cannot have a storage class
 static constexpr uint32_t llvm::MCD::InsnBitWidth<std::bitset<96>> = 96;

/home/botworker/bbot/amdgpu-offload-rhel-8-cmake-build-only/llvm-project/llvm/lib/Target/AMDGPU/Disassembler/AMDGPUDisassembler.cpp:456: error: explicit template specialization cannot have a storage class
 static constexpr uint32_t llvm::MCD::InsnBitWidth<std::bitset<128>> = 128;

[7404/8050] Building CXX object tools/flang/lib/Optimizer/Builder/CMakeFiles/FIRBuilder.dir/DoLoopHelper.cpp.o
[7405/8050] Linking CXX shared library lib/libMLIRGPUPipelines.so.22.0git
[7406/8050] Linking CXX shared library lib/libMLIRCAPIGPU.so.22.0git
[7407/8050] Linking CXX shared library lib/libMLIRNVGPUTransformOps.so.22.0git
[7408/8050] Linking CXX shared library lib/libMLIRSparseTensorPipelines.so.22.0git
[7409/8050] Building CXX object tools/flang/lib/Optimizer/Builder/CMakeFiles/FIRBuilder.dir/Runtime/CUDA/Descriptor.cpp.o
[7410/8050] Building CXX object tools/flang/lib/Optimizer/Builder/CMakeFiles/FIRBuilder.dir/Runtime/Derived.cpp.o
[7411/8050] Building CXX object tools/flang/unittests/Evaluate/CMakeFiles/intrinsics.test.dir/intrinsics.cpp.o
[7412/8050] Building CXX object tools/flang/lib/Optimizer/Builder/CMakeFiles/FIRBuilder.dir/Runtime/Command.cpp.o
[7413/8050] Building CXX object tools/flang/lib/Optimizer/Builder/CMakeFiles/FIRBuilder.dir/Runtime/Allocatable.cpp.o
[7414/8050] Building CXX object tools/flang/lib/Optimizer/Builder/CMakeFiles/FIRBuilder.dir/Runtime/ArrayConstructor.cpp.o
[7415/8050] Building CXX object tools/flang/lib/Optimizer/Builder/CMakeFiles/FIRBuilder.dir/BoxValue.cpp.o
[7416/8050] Building CXX object tools/flang/lib/Optimizer/Builder/CMakeFiles/FIRBuilder.dir/MutableBox.cpp.o
[7417/8050] Building CXX object tools/flang/lib/Optimizer/Builder/CMakeFiles/FIRBuilder.dir/Runtime/Assign.cpp.o
[7418/8050] Building CXX object tools/flang/lib/Optimizer/Builder/CMakeFiles/FIRBuilder.dir/Runtime/Character.cpp.o
[7419/8050] Building CXX object tools/flang/lib/Optimizer/Analysis/CMakeFiles/FIRAnalysis.dir/TBAAForest.cpp.o
[7420/8050] Building CXX object tools/flang/lib/Parser/CMakeFiles/FortranParser.dir/cmake_pch.hxx.gch
[7421/8050] Building CXX object tools/flang/lib/Utils/CMakeFiles/FortranUtils.dir/OpenMP.cpp.o
[7422/8050] Building CXX object tools/flang/lib/Optimizer/Builder/CMakeFiles/FIRBuilder.dir/Character.cpp.o
[7423/8050] Building CXX object tools/flang/unittests/Evaluate/CMakeFiles/expression.test.dir/expression.cpp.o
[7424/8050] Building CXX object tools/flang/lib/Optimizer/Analysis/CMakeFiles/FIRAnalysis.dir/AliasAnalysis.cpp.o
[7425/8050] Building CXX object tools/flang/lib/Optimizer/Builder/CMakeFiles/FIRBuilder.dir/HLFIRTools.cpp.o
[7426/8050] Building CXX object tools/flang/unittests/Evaluate/CMakeFiles/folding.test.dir/folding.cpp.o
[7427/8050] Building CXX object tools/flang/lib/Optimizer/Builder/CMakeFiles/FIRBuilder.dir/FIRBuilder.cpp.o
[7428/8050] Building CXX object tools/flang/lib/Optimizer/Builder/CMakeFiles/FIRBuilder.dir/CUFCommon.cpp.o

```

</details>

https://github.com/llvm/llvm-project/pull/154865