[llvm] [VPlan] Remove no-op SCALAR-STEPS after unrolling. (PR #123655)

LLVM Continuous Integration via llvm-commits llvm-commits at lists.llvm.org
Tue Mar 25 06:05:21 PDT 2025 

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `flang-aarch64-release` running on `linaro-flang-aarch64-release` while building `llvm` at step 5 "build-unified-tree".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/172/builds/11279

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

```
Step 5 (build-unified-tree) failure: build (failure)
...
194.959 [3385/23/3481] Building CXX object tools/mlir/lib/CAPI/ExecutionEngine/CMakeFiles/obj.MLIRCAPIExecutionEngine.dir/ExecutionEngine.cpp.o
194.960 [3385/22/3482] Building CXX object tools/mlir/lib/Conversion/OpenACCToSCF/CMakeFiles/obj.MLIROpenACCToSCF.dir/OpenACCToSCF.cpp.o
194.963 [3385/21/3483] Building CXX object tools/mlir/lib/Dialect/Bufferization/Transforms/CMakeFiles/obj.MLIRBufferizationTransforms.dir/FuncBufferizableOpInterfaceImpl.cpp.o
194.965 [3385/20/3484] Building CXX object tools/mlir/lib/Conversion/PDLToPDLInterp/CMakeFiles/obj.MLIRPDLToPDLInterp.dir/Predicate.cpp.o
194.966 [3385/19/3485] Building CXX object tools/mlir/lib/Dialect/Func/Transforms/CMakeFiles/obj.MLIRFuncTransforms.dir/FuncConversions.cpp.o
194.967 [3385/18/3486] Building CXX object tools/mlir/lib/Conversion/PDLToPDLInterp/CMakeFiles/obj.MLIRPDLToPDLInterp.dir/PDLToPDLInterp.cpp.o
194.969 [3385/17/3487] Building CXX object tools/mlir/lib/Dialect/Func/TransformOps/CMakeFiles/obj.MLIRFuncTransformOps.dir/FuncTransformOps.cpp.o
194.971 [3385/16/3488] Building CXX object tools/mlir/lib/Conversion/OpenMPToLLVM/CMakeFiles/obj.MLIROpenMPToLLVM.dir/OpenMPToLLVM.cpp.o
195.016 [3385/15/3489] Building CXX object tools/mlir/lib/Conversion/ReconcileUnrealizedCasts/CMakeFiles/obj.MLIRReconcileUnrealizedCasts.dir/ReconcileUnrealizedCasts.cpp.o
195.063 [3385/14/3490] Linking CXX executable bin/llvm-lto
FAILED: bin/llvm-lto 
: && /usr/local/bin/c++ -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -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 -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -O3 -DNDEBUG -Wl,-rpath-link,/home/tcwg-buildbot/worker/flang-aarch64-release/build/./lib  -Wl,--gc-sections tools/llvm-lto/CMakeFiles/llvm-lto.dir/llvm-lto.cpp.o -o bin/llvm-lto  -Wl,-rpath,"\$ORIGIN/../lib:"  lib/libLLVMAArch64AsmParser.a  lib/libLLVMAArch64CodeGen.a  lib/libLLVMAArch64Desc.a  lib/libLLVMAArch64Info.a  lib/libLLVMBitReader.a  lib/libLLVMBitWriter.a  lib/libLLVMCodeGen.a  lib/libLLVMCore.a  lib/libLLVMIRReader.a  lib/libLLVMipo.a  lib/libLLVMLTO.a  lib/libLLVMMC.a  lib/libLLVMObject.a  lib/libLLVMSupport.a  lib/libLLVMTarget.a  lib/libLLVMTargetParser.a  lib/libLLVMAArch64Utils.a  lib/libLLVMAsmPrinter.a  lib/libLLVMGlobalISel.a  lib/libLLVMSelectionDAG.a  lib/libLLVMExtensions.a  lib/libLLVMPasses.a  lib/libLLVMCodeGen.a  lib/libLLVMCodeGenTypes.a  lib/libLLVMCGData.a  lib/libLLVMTarget.a  lib/libLLVMCFGuard.a  lib/libLLVMObjCARCOpts.a  lib/libLLVMCoroutines.a  lib/libLLVMipo.a  lib/libLLVMBitWriter.a  lib/libLLVMVectorize.a  lib/libLLVMSandboxIR.a  lib/libLLVMFrontendOpenMP.a  lib/libLLVMFrontendOffloading.a  lib/libLLVMObjectYAML.a  lib/libLLVMFrontendAtomic.a  lib/libLLVMLinker.a  lib/libLLVMInstrumentation.a  lib/libLLVMScalarOpts.a  lib/libLLVMAggressiveInstCombine.a  lib/libLLVMInstCombine.a  lib/libLLVMHipStdPar.a  lib/libLLVMTransformUtils.a  lib/libLLVMIRPrinter.a  lib/libLLVMAnalysis.a  lib/libLLVMProfileData.a  lib/libLLVMSymbolize.a  lib/libLLVMDebugInfoDWARF.a  lib/libLLVMDebugInfoPDB.a  lib/libLLVMObject.a  lib/libLLVMIRReader.a  lib/libLLVMBitReader.a  lib/libLLVMAsmParser.a  lib/libLLVMCore.a  lib/libLLVMRemarks.a  lib/libLLVMBitstreamReader.a  lib/libLLVMMCParser.a  lib/libLLVMMC.a  lib/libLLVMTextAPI.a  lib/libLLVMBinaryFormat.a  lib/libLLVMTargetParser.a  lib/libLLVMDebugInfoCodeView.a  lib/libLLVMDebugInfoMSF.a  lib/libLLVMDebugInfoBTF.a  lib/libLLVMSupport.a  lib/libLLVMDemangle.a  -lrt  -ldl  -lm  /usr/lib/aarch64-linux-gnu/libz.so && :
/usr/bin/ld: lib/libLLVMVectorize.a(VPlanTransforms.cpp.o): in function `llvm::VPlanTransforms::simplifyRecipes(llvm::VPlan&, llvm::Type&)':
VPlanTransforms.cpp:(.text._ZN4llvm15VPlanTransforms15simplifyRecipesERNS_5VPlanERNS_4TypeE+0x30c): undefined reference to `llvm::VPUnrollPartAccessor<2u>::getUnrollPart(llvm::VPUser&) const'
clang++: error: linker command failed with exit code 1 (use -v to see invocation)
195.086 [3385/13/3491] Building CXX object tools/mlir/lib/Conversion/SCFToEmitC/CMakeFiles/obj.MLIRSCFToEmitC.dir/SCFToEmitC.cpp.o
195.088 [3385/12/3492] Linking CXX shared library lib/libLTO.so.21.0git
FAILED: lib/libLTO.so.21.0git 
: && /usr/local/bin/c++ -fPIC -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -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 -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -O3 -DNDEBUG  -Wl,-z,defs -Wl,-z,nodelete   -Wl,-rpath-link,/home/tcwg-buildbot/worker/flang-aarch64-release/build/./lib  -Wl,--gc-sections  -Wl,--version-script,"/home/tcwg-buildbot/worker/flang-aarch64-release/build/tools/lto/LTO.exports" -shared -Wl,-soname,libLTO.so.21.0git -o lib/libLTO.so.21.0git tools/lto/CMakeFiles/LTO.dir/LTODisassembler.cpp.o tools/lto/CMakeFiles/LTO.dir/lto.cpp.o  -Wl,-rpath,"\$ORIGIN/../lib:"  lib/libLLVMAArch64AsmParser.a  lib/libLLVMAArch64CodeGen.a  lib/libLLVMAArch64Desc.a  lib/libLLVMAArch64Disassembler.a  lib/libLLVMAArch64Info.a  lib/libLLVMBitReader.a  lib/libLLVMCore.a  lib/libLLVMCodeGen.a  lib/libLLVMLTO.a  lib/libLLVMMC.a  lib/libLLVMMCDisassembler.a  lib/libLLVMSupport.a  lib/libLLVMTarget.a  lib/libLLVMTargetParser.a  lib/libLLVMAsmPrinter.a  lib/libLLVMGlobalISel.a  lib/libLLVMSelectionDAG.a  lib/libLLVMAArch64Desc.a  lib/libLLVMAArch64Info.a  lib/libLLVMAArch64Utils.a  lib/libLLVMExtensions.a  lib/libLLVMPasses.a  lib/libLLVMCodeGen.a  lib/libLLVMCodeGenTypes.a  lib/libLLVMCGData.a  lib/libLLVMTarget.a  lib/libLLVMCFGuard.a  lib/libLLVMObjCARCOpts.a  lib/libLLVMCoroutines.a  lib/libLLVMipo.a  lib/libLLVMVectorize.a  lib/libLLVMSandboxIR.a  lib/libLLVMBitWriter.a  lib/libLLVMInstrumentation.a  lib/libLLVMLinker.a  lib/libLLVMFrontendOpenMP.a  lib/libLLVMScalarOpts.a  lib/libLLVMAggressiveInstCombine.a  lib/libLLVMInstCombine.a  lib/libLLVMFrontendOffloading.a  lib/libLLVMObjectYAML.a  lib/libLLVMFrontendAtomic.a  lib/libLLVMHipStdPar.a  lib/libLLVMTransformUtils.a  lib/libLLVMIRPrinter.a  lib/libLLVMAnalysis.a  lib/libLLVMProfileData.a  lib/libLLVMSymbolize.a  lib/libLLVMDebugInfoDWARF.a  lib/libLLVMDebugInfoPDB.a  lib/libLLVMDebugInfoCodeView.a  lib/libLLVMDebugInfoMSF.a  lib/libLLVMDebugInfoBTF.a  lib/libLLVMObject.a  lib/libLLVMMCParser.a  lib/libLLVMMC.a  lib/libLLVMIRReader.a  lib/libLLVMBitReader.a  lib/libLLVMAsmParser.a  lib/libLLVMCore.a  lib/libLLVMRemarks.a  lib/libLLVMBitstreamReader.a  lib/libLLVMTextAPI.a  lib/libLLVMBinaryFormat.a  lib/libLLVMTargetParser.a  lib/libLLVMSupport.a  lib/libLLVMDemangle.a  -lrt  -ldl  -lm  /usr/lib/aarch64-linux-gnu/libz.so && :
/usr/bin/ld: lib/libLLVMVectorize.a(VPlanTransforms.cpp.o): in function `llvm::VPlanTransforms::simplifyRecipes(llvm::VPlan&, llvm::Type&)':
VPlanTransforms.cpp:(.text._ZN4llvm15VPlanTransforms15simplifyRecipesERNS_5VPlanERNS_4TypeE+0x30c): undefined reference to `llvm::VPUnrollPartAccessor<2u>::getUnrollPart(llvm::VPUser&) const'
clang++: error: linker command failed with exit code 1 (use -v to see invocation)
195.091 [3385/11/3493] Building CXX object tools/mlir/lib/Conversion/ShapeToStandard/CMakeFiles/obj.MLIRShapeToStandard.dir/ShapeToStandard.cpp.o
195.098 [3385/10/3494] Building CXX object tools/mlir/lib/Conversion/SCFToSPIRV/CMakeFiles/obj.MLIRSCFToSPIRV.dir/SCFToSPIRVPass.cpp.o
195.114 [3385/9/3495] Building CXX object tools/mlir/lib/Conversion/SPIRVCommon/CMakeFiles/obj.MLIRSPIRVAttrToLLVMConversion.dir/AttrToLLVMConverter.cpp.o
195.133 [3385/8/3496] Building CXX object tools/mlir/lib/Conversion/SCFToGPU/CMakeFiles/obj.MLIRSCFToGPU.dir/SCFToGPUPass.cpp.o
195.136 [3385/7/3497] Building CXX object tools/mlir/lib/Conversion/SCFToOpenMP/CMakeFiles/obj.MLIRSCFToOpenMP.dir/SCFToOpenMP.cpp.o
195.137 [3385/6/3498] Building CXX object tools/mlir/lib/Conversion/ShapeToStandard/CMakeFiles/obj.MLIRShapeToStandard.dir/ConvertShapeConstraints.cpp.o
195.139 [3385/5/3499] Building CXX object tools/mlir/lib/Dialect/GPU/Pipelines/CMakeFiles/obj.MLIRGPUPipelines.dir/GPUToNVVMPipeline.cpp.o
195.140 [3385/4/3500] Building CXX object tools/mlir/lib/Conversion/SCFToSPIRV/CMakeFiles/obj.MLIRSCFToSPIRV.dir/SCFToSPIRV.cpp.o
195.141 [3385/3/3501] Building CXX object tools/mlir/lib/Conversion/SCFToControlFlow/CMakeFiles/obj.MLIRSCFToControlFlow.dir/SCFToControlFlow.cpp.o
195.151 [3385/2/3502] Building CXX object tools/mlir/test/lib/Dialect/MemRef/CMakeFiles/MLIRMemRefTestPasses.dir/TestEmulateNarrowType.cpp.o
195.229 [3385/1/3503] Building CXX object tools/mlir/lib/Conversion/SCFToGPU/CMakeFiles/obj.MLIRSCFToGPU.dir/SCFToGPU.cpp.o
ninja: build stopped: subcommand failed.

```

</details>

https://github.com/llvm/llvm-project/pull/123655

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