[clang] [llvm] [SPIRV] Add support for the `SPV_EXT_long_vector` extension (PR #210279)

Thu Aug 27 02:57:12 PDT 2026

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `release-noassertions-warnings` running on `google-integrate-b2` while building `llvm` at step 6 "build-default".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/228/builds/9307

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

```
Step 6 (build-default) failure: cmake (failure)
...
31.353 [5528/34/3159] Building RISCVGenSearchableTables.inc...
31.412 [5527/34/3160] Building CXX object lib/Target/SPIRV/CMakeFiles/LLVMSPIRVCodeGen.dir/SPIRVInlineAsmLowering.cpp.o
31.651 [5526/34/3161] Building RISCVGenDAGISel.inc...
32.220 [5525/34/3162] Building CXX object lib/MC/MCParser/CMakeFiles/LLVMMCParser.dir/AsmParser.cpp.o
32.365 [5524/34/3163] Building CXX object lib/Target/SPIRV/CMakeFiles/LLVMSPIRVCodeGen.dir/SPIRVCallLowering.cpp.o
32.397 [5523/34/3164] Building CXX object lib/Target/SPIRV/CMakeFiles/LLVMSPIRVCodeGen.dir/SPIRVInstrInfo.cpp.o
32.413 [5522/34/3165] Building CXX object lib/Target/SPIRV/CMakeFiles/LLVMSPIRVCodeGen.dir/SPIRVRegisterBankInfo.cpp.o
32.778 [5521/34/3166] Building RISCVGenSubtargetInfo.inc...
32.825 [5520/34/3167] Building RISCVGenGlobalISel.inc...
32.883 [5519/34/3168] Building CXX object lib/Target/SPIRV/CMakeFiles/LLVMSPIRVCodeGen.dir/SPIRVGlobalRegistry.cpp.o
FAILED: lib/Target/SPIRV/CMakeFiles/LLVMSPIRVCodeGen.dir/SPIRVGlobalRegistry.cpp.o 
CCACHE_CPP2=yes CCACHE_HASHDIR=yes CCACHE_SLOPPINESS=pch_defines,time_macros /usr/bin/ccache /usr/bin/c++ -D_GLIBCXX_USE_CXX11_ABI=1 -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/b/release-noassertions-warnings-build/build/lib/Target/SPIRV -I/b/release-noassertions-warnings-build/llvm-project/llvm/lib/Target/SPIRV -I/b/release-noassertions-warnings-build/build/include -I/b/release-noassertions-warnings-build/llvm-project/llvm/include -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror -Werror=date-time -Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -pedantic -Wno-long-long -Wc++98-compat-extra-semi -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wstring-conversion -Wno-pass-failed -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -Xclang -fno-pch-timestamp -O3 -DNDEBUG -std=c++17 -fvisibility=hidden -fno-exceptions -funwind-tables -fno-rtti -Winvalid-pch -Xclang -include-pch -Xclang /b/release-noassertions-warnings-build/build/lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/cmake_pch.hxx.pch -Xclang -include -Xclang /b/release-noassertions-warnings-build/build/lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/cmake_pch.hxx -MD -MT lib/Target/SPIRV/CMakeFiles/LLVMSPIRVCodeGen.dir/SPIRVGlobalRegistry.cpp.o -MF lib/Target/SPIRV/CMakeFiles/LLVMSPIRVCodeGen.dir/SPIRVGlobalRegistry.cpp.o.d -o lib/Target/SPIRV/CMakeFiles/LLVMSPIRVCodeGen.dir/SPIRVGlobalRegistry.cpp.o -c /b/release-noassertions-warnings-build/llvm-project/llvm/lib/Target/SPIRV/SPIRVGlobalRegistry.cpp
/b/release-noassertions-warnings-build/llvm-project/llvm/lib/Target/SPIRV/SPIRVGlobalRegistry.cpp:638:15: error: unused variable 'ST' [-Werror,-Wunused-variable]
  638 |   const auto &ST = I.getMF()->getSubtarget<SPIRVSubtarget>();
      |               ^~
1 error generated.
32.906 [5519/33/3169] Building CXX object lib/Target/RISCV/CMakeFiles/LLVMRISCVCodeGen.dir/RISCVAsmPrinter.cpp.o
33.277 [5519/32/3170] Building CXX object lib/Transforms/Scalar/CMakeFiles/LLVMScalarOpts.dir/GVN.cpp.o
33.404 [5519/31/3171] Building CXX object lib/Target/SPIRV/CMakeFiles/LLVMSPIRVCodeGen.dir/SPIRVInstructionSelector.cpp.o
FAILED: lib/Target/SPIRV/CMakeFiles/LLVMSPIRVCodeGen.dir/SPIRVInstructionSelector.cpp.o 
CCACHE_CPP2=yes CCACHE_HASHDIR=yes CCACHE_SLOPPINESS=pch_defines,time_macros /usr/bin/ccache /usr/bin/c++ -D_GLIBCXX_USE_CXX11_ABI=1 -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/b/release-noassertions-warnings-build/build/lib/Target/SPIRV -I/b/release-noassertions-warnings-build/llvm-project/llvm/lib/Target/SPIRV -I/b/release-noassertions-warnings-build/build/include -I/b/release-noassertions-warnings-build/llvm-project/llvm/include -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror -Werror=date-time -Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -pedantic -Wno-long-long -Wc++98-compat-extra-semi -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wstring-conversion -Wno-pass-failed -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -Xclang -fno-pch-timestamp -O3 -DNDEBUG -std=c++17 -fvisibility=hidden -fno-exceptions -funwind-tables -fno-rtti -Winvalid-pch -Xclang -include-pch -Xclang /b/release-noassertions-warnings-build/build/lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/cmake_pch.hxx.pch -Xclang -include -Xclang /b/release-noassertions-warnings-build/build/lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/cmake_pch.hxx -MD -MT lib/Target/SPIRV/CMakeFiles/LLVMSPIRVCodeGen.dir/SPIRVInstructionSelector.cpp.o -MF lib/Target/SPIRV/CMakeFiles/LLVMSPIRVCodeGen.dir/SPIRVInstructionSelector.cpp.o.d -o lib/Target/SPIRV/CMakeFiles/LLVMSPIRVCodeGen.dir/SPIRVInstructionSelector.cpp.o -c /b/release-noassertions-warnings-build/llvm-project/llvm/lib/Target/SPIRV/SPIRVInstructionSelector.cpp
/b/release-noassertions-warnings-build/llvm-project/llvm/lib/Target/SPIRV/SPIRVInstructionSelector.cpp:6748:8: error: unused variable 'IsLongVectorEXT' [-Werror,-Wunused-variable]
 6748 |   bool IsLongVectorEXT =
      |        ^~~~~~~~~~~~~~~
1 error generated.
33.525 [5519/30/3172] Building CXX object lib/Target/SPIRV/CMakeFiles/LLVMSPIRVCodeGen.dir/SPIRVLegalizeZeroSizeArrays.cpp.o
33.804 [5519/29/3173] Building CXX object lib/Target/SPIRV/CMakeFiles/LLVMSPIRVCodeGen.dir/SPIRVMergeRegionExitTargets.cpp.o
34.090 [5519/28/3174] Building CXX object lib/Target/SPIRV/CMakeFiles/LLVMSPIRVCodeGen.dir/SPIRVLegalizePointerCast.cpp.o
34.324 [5519/27/3175] Building CXX object lib/Target/SPIRV/CMakeFiles/LLVMSPIRVCodeGen.dir/SPIRVMCInstLower.cpp.o
34.395 [5519/26/3176] Building CXX object lib/Target/SPIRV/CMakeFiles/LLVMSPIRVCodeGen.dir/SPIRVPrepareGlobals.cpp.o
34.483 [5519/25/3177] Building CXX object lib/Target/SPIRV/CMakeFiles/LLVMSPIRVCodeGen.dir/SPIRVISelLowering.cpp.o
34.764 [5519/24/3178] Building CXX object lib/Target/SPIRV/CMakeFiles/LLVMSPIRVCodeGen.dir/SPIRVAsmPrinter.cpp.o
34.796 [5519/23/3179] Building CXX object lib/Target/SPIRV/CMakeFiles/LLVMSPIRVCodeGen.dir/SPIRVRegularizer.cpp.o
35.139 [5519/22/3180] Building CXX object lib/Target/SPIRV/CMakeFiles/LLVMSPIRVCodeGen.dir/SPIRVPostLegalizer.cpp.o
35.178 [5519/21/3181] Building CXX object lib/Target/SPIRV/CMakeFiles/LLVMSPIRVCodeGen.dir/SPIRVCodeGenPassBuilder.cpp.o
35.252 [5519/20/3182] Building CXX object lib/Target/SPIRV/CMakeFiles/LLVMSPIRVCodeGen.dir/SPIRVCombinerHelper.cpp.o
35.627 [5519/19/3183] Building CXX object lib/Target/SPIRV/CMakeFiles/LLVMSPIRVCodeGen.dir/SPIRVLegalizerInfo.cpp.o
35.931 [5519/18/3184] Building CXX object lib/Target/SPIRV/CMakeFiles/LLVMSPIRVCodeGen.dir/SPIRVRegisterInfo.cpp.o
36.262 [5519/17/3185] Building CXX object lib/Target/SPIRV/CMakeFiles/LLVMSPIRVCodeGen.dir/SPIRVStructurizer.cpp.o
36.534 [5519/16/3186] Building CXX object lib/Target/SPIRV/CMakeFiles/LLVMSPIRVCodeGen.dir/SPIRVBuiltins.cpp.o
36.673 [5519/15/3187] Building CXX object lib/Target/SPIRV/CMakeFiles/LLVMSPIRVCodeGen.dir/SPIRVPreLegalizerCombiner.cpp.o
37.361 [5519/14/3188] Building CXX object lib/Target/SPIRV/CMakeFiles/LLVMSPIRVCodeGen.dir/SPIRVPreLegalizer.cpp.o
37.428 [5519/13/3189] Building CXX object lib/CodeGen/AsmPrinter/CMakeFiles/LLVMAsmPrinter.dir/AsmPrinter.cpp.o
38.326 [5519/12/3190] Building CXX object lib/Target/SPIRV/CMakeFiles/LLVMSPIRVCodeGen.dir/SPIRVModuleAnalysis.cpp.o
38.854 [5519/11/3191] Building CXX object lib/LTO/CMakeFiles/LLVMLTO.dir/LTO.cpp.o
39.460 [5519/10/3192] Building CXX object lib/Target/SPIRV/CMakeFiles/LLVMSPIRVCodeGen.dir/SPIRVEmitIntrinsics.cpp.o
39.590 [5519/9/3193] Building CXX object lib/Target/SPIRV/CMakeFiles/LLVMSPIRVCodeGen.dir/SPIRVPrepareFunctions.cpp.o
40.456 [5519/8/3194] Building AMDGPUGenCallingConv.inc...
41.972 [5519/7/3195] Building AMDGPUGenAsmWriter.inc...

```

</details>

https://github.com/llvm/llvm-project/pull/210279