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

Tue Sep 2 03:38:17 PDT 2025

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `amdgpu-offload-rhel-9-cmake-build-only` running on `rocm-docker-rhel-9` while building `llvm` at step 4 "annotate".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/205/builds/20570

<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)
...
[7208/8050] Building CXX object tools/flang/lib/Optimizer/Dialect/CMakeFiles/FIRDialect.dir/Inliner.cpp.o
[7209/8050] Linking CXX shared library lib/libMLIRROCDLTarget.so.22.0git
[7210/8050] Building CXX object tools/flang/lib/Semantics/CMakeFiles/FortranSemantics.dir/cmake_pch.hxx.gch
[7211/8050] Creating library symlink lib/libMLIRROCDLTarget.so
[7212/8050] Building CXX object tools/mlir/lib/ExecutionEngine/CMakeFiles/MLIRJitRunner.dir/JitRunner.cpp.o
[7213/8050] Linking CXX shared library lib/libMLIRGPUTransforms.so.22.0git
[7214/8050] Creating library symlink lib/libMLIRGPUTransforms.so
[7215/8050] Linking CXX shared library lib/libMLIRGPUToGPURuntimeTransforms.so.22.0git
[7216/8050] Creating library symlink lib/libMLIRGPUToGPURuntimeTransforms.so
[7217/8050] 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-9-cmake-build-only/build/lib/Target/AMDGPU/Disassembler -I/home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/llvm-project/llvm/lib/Target/AMDGPU/Disassembler -I/home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/llvm-project/llvm/lib/Target/AMDGPU -I/home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/build/lib/Target/AMDGPU -I/home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/build/include -I/home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/llvm-project/llvm/include -I/home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/build/lib/Target/AMDGPU/Disassembler/.. -I/home/botworker/bbot/amdgpu-offload-rhel-9-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-redundant-move -Wno-pessimizing-move -Wno-noexcept-type -Wdelete-non-virtual-dtor -Wsuggest-override -Wno-comment -Wno-misleading-indentation -Wctad-maybe-unsupported -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-9-cmake-build-only/llvm-project/llvm/lib/Target/AMDGPU/Disassembler/AMDGPUDisassembler.cpp
/home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/llvm-project/llvm/lib/Target/AMDGPU/Disassembler/AMDGPUDisassembler.cpp:451: error: explicit template specialization cannot have a storage class
  451 | template <> static constexpr uint32_t llvm::MCD::InsnBitWidth<uint32_t> = 32;
      | 
/home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/llvm-project/llvm/lib/Target/AMDGPU/Disassembler/AMDGPUDisassembler.cpp:452: error: explicit template specialization cannot have a storage class
  452 | template <> static constexpr uint32_t llvm::MCD::InsnBitWidth<uint64_t> = 64;
      | 
/home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/llvm-project/llvm/lib/Target/AMDGPU/Disassembler/AMDGPUDisassembler.cpp:454: error: explicit template specialization cannot have a storage class
  454 | static constexpr uint32_t llvm::MCD::InsnBitWidth<std::bitset<96>> = 96;
      | 
/home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/llvm-project/llvm/lib/Target/AMDGPU/Disassembler/AMDGPUDisassembler.cpp:456: error: explicit template specialization cannot have a storage class
  456 | static constexpr uint32_t llvm::MCD::InsnBitWidth<std::bitset<128>> = 128;
      | 
[7218/8050] Linking CXX shared library lib/libMLIRGPUToLLVMSPV.so.22.0git
[7219/8050] Building CXX object tools/flang/lib/Optimizer/Builder/CMakeFiles/FIRBuilder.dir/Runtime/Allocatable.cpp.o
[7220/8050] Building CXX object tools/flang/lib/Evaluate/CMakeFiles/FortranEvaluate.dir/constant.cpp.o
[7221/8050] Building CXX object tools/flang/lib/Optimizer/OpenACC/Support/CMakeFiles/FIROpenACCSupport.dir/FIROpenACCAttributes.cpp.o
[7222/8050] Building CXX object tools/flang/lib/Parser/CMakeFiles/FortranParser.dir/openacc-parsers.cpp.o
[7223/8050] Building CXX object tools/flang/lib/Optimizer/Transforms/CMakeFiles/FIRTransforms.dir/AnnotateConstant.cpp.o
[7224/8050] Building CXX object tools/flang/lib/Optimizer/OpenMP/CMakeFiles/FlangOpenMPTransforms.dir/MarkDeclareTarget.cpp.o
[7225/8050] Building CXX object tools/flang/lib/Optimizer/Transforms/CMakeFiles/FIRTransforms.dir/ControlFlowConverter.cpp.o
[7226/8050] Building CXX object tools/flang/lib/Optimizer/Transforms/CMakeFiles/FIRTransforms.dir/AffineDemotion.cpp.o
[7227/8050] Building CXX object tools/flang/lib/Optimizer/Transforms/CMakeFiles/FIRTransforms.dir/CompilerGeneratedNames.cpp.o
[7228/8050] Building CXX object tools/flang/lib/Optimizer/Transforms/CMakeFiles/FIRTransforms.dir/CUFAddConstructor.cpp.o
[7229/8050] Building CXX object tools/flang/lib/Evaluate/CMakeFiles/FortranEvaluate.dir/call.cpp.o
[7230/8050] Building CXX object tools/flang/lib/Evaluate/CMakeFiles/FortranEvaluate.dir/type.cpp.o
[7231/8050] Building CXX object tools/flang/lib/Evaluate/CMakeFiles/FortranEvaluate.dir/initial-image.cpp.o
[7232/8050] Building CXX object tools/flang/lib/Evaluate/CMakeFiles/FortranEvaluate.dir/formatting.cpp.o
[7233/8050] Building CXX object tools/flang/lib/Evaluate/CMakeFiles/FortranEvaluate.dir/intrinsics-library.cpp.o
[7234/8050] Building CXX object tools/flang/tools/tco/CMakeFiles/tco.dir/tco.cpp.o
[7235/8050] Building CXX object tools/flang/lib/Evaluate/CMakeFiles/FortranEvaluate.dir/fold-designator.cpp.o
[7236/8050] Building CXX object tools/flang/lib/Evaluate/CMakeFiles/FortranEvaluate.dir/fold-reduction.cpp.o
[7237/8050] Building CXX object tools/flang/tools/f18-parse-demo/CMakeFiles/f18-parse-demo.dir/f18-parse-demo.cpp.o
[7238/8050] Building CXX object tools/flang/lib/Evaluate/CMakeFiles/FortranEvaluate.dir/expression.cpp.o
[7239/8050] Building CXX object tools/flang/lib/Evaluate/CMakeFiles/FortranEvaluate.dir/intrinsics.cpp.o
[7240/8050] Building CXX object tools/flang/lib/Evaluate/CMakeFiles/FortranEvaluate.dir/shape.cpp.o
[7241/8050] Building CXX object tools/flang/lib/Evaluate/CMakeFiles/FortranEvaluate.dir/characteristics.cpp.o
[7242/8050] Building CXX object tools/flang/lib/Evaluate/CMakeFiles/FortranEvaluate.dir/fold-character.cpp.o
Step 7 (build cmake config) failure: build cmake config (failure)
...
[7208/8050] Building CXX object tools/flang/lib/Optimizer/Dialect/CMakeFiles/FIRDialect.dir/Inliner.cpp.o
[7209/8050] Linking CXX shared library lib/libMLIRROCDLTarget.so.22.0git
[7210/8050] Building CXX object tools/flang/lib/Semantics/CMakeFiles/FortranSemantics.dir/cmake_pch.hxx.gch
[7211/8050] Creating library symlink lib/libMLIRROCDLTarget.so
[7212/8050] Building CXX object tools/mlir/lib/ExecutionEngine/CMakeFiles/MLIRJitRunner.dir/JitRunner.cpp.o
[7213/8050] Linking CXX shared library lib/libMLIRGPUTransforms.so.22.0git
[7214/8050] Creating library symlink lib/libMLIRGPUTransforms.so
[7215/8050] Linking CXX shared library lib/libMLIRGPUToGPURuntimeTransforms.so.22.0git
[7216/8050] Creating library symlink lib/libMLIRGPUToGPURuntimeTransforms.so
[7217/8050] 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-9-cmake-build-only/build/lib/Target/AMDGPU/Disassembler -I/home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/llvm-project/llvm/lib/Target/AMDGPU/Disassembler -I/home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/llvm-project/llvm/lib/Target/AMDGPU -I/home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/build/lib/Target/AMDGPU -I/home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/build/include -I/home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/llvm-project/llvm/include -I/home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/build/lib/Target/AMDGPU/Disassembler/.. -I/home/botworker/bbot/amdgpu-offload-rhel-9-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-redundant-move -Wno-pessimizing-move -Wno-noexcept-type -Wdelete-non-virtual-dtor -Wsuggest-override -Wno-comment -Wno-misleading-indentation -Wctad-maybe-unsupported -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-9-cmake-build-only/llvm-project/llvm/lib/Target/AMDGPU/Disassembler/AMDGPUDisassembler.cpp
/home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/llvm-project/llvm/lib/Target/AMDGPU/Disassembler/AMDGPUDisassembler.cpp:451: error: explicit template specialization cannot have a storage class
  451 | template <> static constexpr uint32_t llvm::MCD::InsnBitWidth<uint32_t> = 32;
      | 
/home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/llvm-project/llvm/lib/Target/AMDGPU/Disassembler/AMDGPUDisassembler.cpp:452: error: explicit template specialization cannot have a storage class
  452 | template <> static constexpr uint32_t llvm::MCD::InsnBitWidth<uint64_t> = 64;
      | 
/home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/llvm-project/llvm/lib/Target/AMDGPU/Disassembler/AMDGPUDisassembler.cpp:454: error: explicit template specialization cannot have a storage class
  454 | static constexpr uint32_t llvm::MCD::InsnBitWidth<std::bitset<96>> = 96;
      | 
/home/botworker/bbot/amdgpu-offload-rhel-9-cmake-build-only/llvm-project/llvm/lib/Target/AMDGPU/Disassembler/AMDGPUDisassembler.cpp:456: error: explicit template specialization cannot have a storage class
  456 | static constexpr uint32_t llvm::MCD::InsnBitWidth<std::bitset<128>> = 128;
      |
[7218/8050] Linking CXX shared library lib/libMLIRGPUToLLVMSPV.so.22.0git
[7219/8050] Building CXX object tools/flang/lib/Optimizer/Builder/CMakeFiles/FIRBuilder.dir/Runtime/Allocatable.cpp.o
[7220/8050] Building CXX object tools/flang/lib/Evaluate/CMakeFiles/FortranEvaluate.dir/constant.cpp.o
[7221/8050] Building CXX object tools/flang/lib/Optimizer/OpenACC/Support/CMakeFiles/FIROpenACCSupport.dir/FIROpenACCAttributes.cpp.o
[7222/8050] Building CXX object tools/flang/lib/Parser/CMakeFiles/FortranParser.dir/openacc-parsers.cpp.o
[7223/8050] Building CXX object tools/flang/lib/Optimizer/Transforms/CMakeFiles/FIRTransforms.dir/AnnotateConstant.cpp.o
[7224/8050] Building CXX object tools/flang/lib/Optimizer/OpenMP/CMakeFiles/FlangOpenMPTransforms.dir/MarkDeclareTarget.cpp.o
[7225/8050] Building CXX object tools/flang/lib/Optimizer/Transforms/CMakeFiles/FIRTransforms.dir/ControlFlowConverter.cpp.o
[7226/8050] Building CXX object tools/flang/lib/Optimizer/Transforms/CMakeFiles/FIRTransforms.dir/AffineDemotion.cpp.o
[7227/8050] Building CXX object tools/flang/lib/Optimizer/Transforms/CMakeFiles/FIRTransforms.dir/CompilerGeneratedNames.cpp.o
[7228/8050] Building CXX object tools/flang/lib/Optimizer/Transforms/CMakeFiles/FIRTransforms.dir/CUFAddConstructor.cpp.o
[7229/8050] Building CXX object tools/flang/lib/Evaluate/CMakeFiles/FortranEvaluate.dir/call.cpp.o
[7230/8050] Building CXX object tools/flang/lib/Evaluate/CMakeFiles/FortranEvaluate.dir/type.cpp.o
[7231/8050] Building CXX object tools/flang/lib/Evaluate/CMakeFiles/FortranEvaluate.dir/initial-image.cpp.o
[7232/8050] Building CXX object tools/flang/lib/Evaluate/CMakeFiles/FortranEvaluate.dir/formatting.cpp.o
[7233/8050] Building CXX object tools/flang/lib/Evaluate/CMakeFiles/FortranEvaluate.dir/intrinsics-library.cpp.o
[7234/8050] Building CXX object tools/flang/tools/tco/CMakeFiles/tco.dir/tco.cpp.o
[7235/8050] Building CXX object tools/flang/lib/Evaluate/CMakeFiles/FortranEvaluate.dir/fold-designator.cpp.o
[7236/8050] Building CXX object tools/flang/lib/Evaluate/CMakeFiles/FortranEvaluate.dir/fold-reduction.cpp.o
[7237/8050] Building CXX object tools/flang/tools/f18-parse-demo/CMakeFiles/f18-parse-demo.dir/f18-parse-demo.cpp.o
[7238/8050] Building CXX object tools/flang/lib/Evaluate/CMakeFiles/FortranEvaluate.dir/expression.cpp.o
[7239/8050] Building CXX object tools/flang/lib/Evaluate/CMakeFiles/FortranEvaluate.dir/intrinsics.cpp.o
[7240/8050] Building CXX object tools/flang/lib/Evaluate/CMakeFiles/FortranEvaluate.dir/shape.cpp.o
[7241/8050] Building CXX object tools/flang/lib/Evaluate/CMakeFiles/FortranEvaluate.dir/characteristics.cpp.o
[7242/8050] Building CXX object tools/flang/lib/Evaluate/CMakeFiles/FortranEvaluate.dir/fold-character.cpp.o

```

</details>

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