[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 06:07:34 PDT 2025 

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `polly-x86_64-linux-plugin` running on `polly-x86_64-gce1` while building `llvm` at step 5 "build".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/158/builds/7359

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

```
Step 5 (build) failure: 'ninja' (failure)
...
[31/121] Linking CXX executable bin/clang-format
[32/121] Linking CXX static library lib/libLLVMVectorize.a
[33/121] Linking CXX executable bin/clang-offload-bundler
[34/121] Linking CXX static library lib/libLLVMLTO.a
[35/121] Linking CXX executable bin/clang-fuzzer-dictionary
[36/121] Linking CXX executable bin/diagtool
[37/121] Linking CXX executable bin/clang-refactor
[38/121] Linking CXX executable bin/clang-diff
[39/121] Linking CXX executable bin/clang-installapi
[40/121] Linking CXX executable bin/llvm-lto
FAILED: bin/llvm-lto 
: && /usr/bin/c++ -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 -fuse-ld=lld -Wl,--color-diagnostics    -Wl,--gc-sections tools/llvm-lto/CMakeFiles/llvm-lto.dir/llvm-lto.cpp.o -o bin/llvm-lto  -Wl,-rpath,"\$ORIGIN/../lib:"  lib/libLLVMX86AsmParser.a  lib/libLLVMX86CodeGen.a  lib/libLLVMNVPTXCodeGen.a  lib/libLLVMX86Desc.a  lib/libLLVMNVPTXDesc.a  lib/libLLVMX86Info.a  lib/libLLVMNVPTXInfo.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/libLLVMMCDisassembler.a  lib/libLLVMGlobalISel.a  lib/libLLVMAsmPrinter.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/libLLVMIRPrinter.a  lib/libLLVMObjCARCOpts.a  lib/libLLVMCoroutines.a  lib/libLLVMipo.a  lib/libLLVMBitWriter.a  lib/libLLVMInstrumentation.a  lib/libLLVMVectorize.a  lib/libLLVMSandboxIR.a  lib/libLLVMFrontendOpenMP.a  lib/libLLVMFrontendOffloading.a  lib/libLLVMObjectYAML.a  lib/libLLVMFrontendAtomic.a  lib/libLLVMLinker.a  lib/libLLVMScalarOpts.a  lib/libLLVMAggressiveInstCombine.a  lib/libLLVMInstCombine.a  lib/libLLVMHipStdPar.a  lib/libLLVMTransformUtils.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/libLLVMDebugInfoCodeView.a  lib/libLLVMDebugInfoMSF.a  lib/libLLVMDebugInfoBTF.a  lib/libLLVMBinaryFormat.a  lib/libLLVMTargetParser.a  lib/libLLVMSupport.a  lib/libLLVMDemangle.a  -lrt  -ldl  -lm  /usr/lib/x86_64-linux-gnu/libz.so && :
ld.lld: error: undefined symbol: llvm::VPUnrollPartAccessor<2u>::getUnrollPart(llvm::VPUser&) const
>>> referenced by VPlanTransforms.cpp
>>>               VPlanTransforms.cpp.o:(llvm::VPlanTransforms::simplifyRecipes(llvm::VPlan&, llvm::Type&) (.localalias)) in archive lib/libLLVMVectorize.a
collect2: error: ld returned 1 exit status
[41/121] Linking CXX shared library lib/libLTO.so.21.0git
FAILED: lib/libLTO.so.21.0git 
: && /usr/bin/c++ -fPIC -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  -Wl,-z,defs -Wl,-z,nodelete -fuse-ld=lld -Wl,--color-diagnostics   -Wl,--gc-sections  -Wl,--version-script,"/home/worker/buildbot-workers/polly-x86_64-gce1/rundir/llvm.obj/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/libLLVMX86AsmParser.a  lib/libLLVMX86CodeGen.a  lib/libLLVMNVPTXCodeGen.a  lib/libLLVMX86Desc.a  lib/libLLVMNVPTXDesc.a  lib/libLLVMX86Disassembler.a  lib/libLLVMX86Info.a  lib/libLLVMNVPTXInfo.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/libLLVMGlobalISel.a  lib/libLLVMAsmPrinter.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/libLLVMIRPrinter.a  lib/libLLVMObjCARCOpts.a  lib/libLLVMCoroutines.a  lib/libLLVMipo.a  lib/libLLVMInstrumentation.a  lib/libLLVMVectorize.a  lib/libLLVMSandboxIR.a  lib/libLLVMBitWriter.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/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/x86_64-linux-gnu/libz.so && :
ld.lld: error: undefined symbol: llvm::VPUnrollPartAccessor<2u>::getUnrollPart(llvm::VPUser&) const
>>> referenced by VPlanTransforms.cpp
>>>               VPlanTransforms.cpp.o:(llvm::VPlanTransforms::simplifyRecipes(llvm::VPlan&, llvm::Type&) (.localalias)) in archive lib/libLLVMVectorize.a
collect2: error: ld returned 1 exit status
[42/121] Linking CXX executable bin/clang-linker-wrapper
[43/121] Linking CXX executable bin/clang-21
FAILED: bin/clang-21 
: && /usr/bin/c++ -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 -fno-common -Woverloaded-virtual -fno-strict-aliasing -O3 -DNDEBUG -fuse-ld=lld -Wl,--color-diagnostics   -Wl,--export-dynamic tools/clang/tools/driver/CMakeFiles/clang.dir/driver.cpp.o tools/clang/tools/driver/CMakeFiles/clang.dir/cc1_main.cpp.o tools/clang/tools/driver/CMakeFiles/clang.dir/cc1as_main.cpp.o tools/clang/tools/driver/CMakeFiles/clang.dir/cc1gen_reproducer_main.cpp.o tools/clang/tools/driver/CMakeFiles/clang.dir/clang-driver.cpp.o -o bin/clang-21  -Wl,-rpath,"\$ORIGIN/../lib:"  lib/libLLVMX86CodeGen.a  lib/libLLVMX86AsmParser.a  lib/libLLVMX86Desc.a  lib/libLLVMX86Disassembler.a  lib/libLLVMX86Info.a  lib/libLLVMNVPTXCodeGen.a  lib/libLLVMNVPTXDesc.a  lib/libLLVMNVPTXInfo.a  lib/libLLVMAnalysis.a  lib/libLLVMCodeGen.a  lib/libLLVMCore.a  lib/libLLVMipo.a  lib/libLLVMAggressiveInstCombine.a  lib/libLLVMInstCombine.a  lib/libLLVMInstrumentation.a  lib/libLLVMMC.a  lib/libLLVMMCParser.a  lib/libLLVMObjCARCOpts.a  lib/libLLVMOption.a  lib/libLLVMScalarOpts.a  lib/libLLVMSupport.a  lib/libLLVMTargetParser.a  lib/libLLVMTransformUtils.a  lib/libLLVMVectorize.a  lib/libclangBasic.a  lib/libclangCodeGen.a  lib/libclangDriver.a  lib/libclangFrontend.a  lib/libclangFrontendTool.a  lib/libclangSerialization.a  lib/libLLVMGlobalISel.a  lib/libLLVMMCDisassembler.a  lib/libLLVMAsmPrinter.a  lib/libLLVMSelectionDAG.a  lib/libclangCodeGen.a  lib/libLLVMCoverage.a  lib/libLLVMFrontendDriver.a  lib/libLLVMLTO.a  lib/libLLVMExtensions.a  lib/libLLVMPasses.a  lib/libLLVMCodeGen.a  lib/libLLVMCodeGenTypes.a  lib/libLLVMCGData.a  lib/libLLVMObjCARCOpts.a  lib/libLLVMCFGuard.a  lib/libLLVMIRPrinter.a  lib/libLLVMTarget.a  lib/libLLVMCoroutines.a  lib/libLLVMipo.a  lib/libLLVMInstrumentation.a  lib/libLLVMVectorize.a  lib/libLLVMSandboxIR.a  lib/libLLVMBitWriter.a  lib/libLLVMLinker.a  lib/libLLVMHipStdPar.a  lib/libclangExtractAPI.a  lib/libclangIndex.a  lib/libclangFormat.a  lib/libclangToolingInclusions.a  lib/libclangToolingCore.a  lib/libclangInstallAPI.a  lib/libLLVMTextAPIBinaryReader.a  lib/libclangRewriteFrontend.a  lib/libclangFrontend.a  lib/libclangDriver.a  lib/libLLVMWindowsDriver.a  lib/libLLVMOption.a  lib/libclangParse.a  lib/libclangSerialization.a  lib/libclangSema.a  lib/libclangAnalysis.a  lib/libclangASTMatchers.a  lib/libLLVMFrontendHLSL.a  lib/libclangAPINotes.a  lib/libclangSupport.a  lib/libclangEdit.a  lib/libclangAST.a  lib/libclangRewrite.a  lib/libclangLex.a  lib/libclangBasic.a  lib/libLLVMFrontendOpenMP.a  lib/libLLVMScalarOpts.a  lib/libLLVMAggressiveInstCombine.a  lib/libLLVMInstCombine.a  lib/libLLVMFrontendOffloading.a  lib/libLLVMTransformUtils.a  lib/libLLVMObjectYAML.a  lib/libLLVMFrontendAtomic.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/libLLVMTextAPI.a  lib/libLLVMCore.a  lib/libLLVMBinaryFormat.a  lib/libLLVMTargetParser.a  lib/libLLVMRemarks.a  lib/libLLVMBitstreamReader.a  lib/libLLVMSupport.a  lib/libLLVMDemangle.a  -lrt  -ldl  -lm  /usr/lib/x86_64-linux-gnu/libz.so && :
ld.lld: error: undefined symbol: llvm::VPUnrollPartAccessor<2u>::getUnrollPart(llvm::VPUser&) const
>>> referenced by VPlanTransforms.cpp
>>>               VPlanTransforms.cpp.o:(llvm::VPlanTransforms::simplifyRecipes(llvm::VPlan&, llvm::Type&) (.localalias)) in archive lib/libLLVMVectorize.a
collect2: error: ld returned 1 exit status
[44/121] Linking CXX executable bin/clang-nvlink-wrapper
FAILED: bin/clang-nvlink-wrapper 
: && /usr/bin/c++ -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 -fno-common -Woverloaded-virtual -fno-strict-aliasing -O3 -DNDEBUG -fuse-ld=lld -Wl,--color-diagnostics    -Wl,--gc-sections tools/clang/tools/clang-nvlink-wrapper/CMakeFiles/clang-nvlink-wrapper.dir/ClangNVLinkWrapper.cpp.o -o bin/clang-nvlink-wrapper  -Wl,-rpath,"\$ORIGIN/../lib:"  lib/libLLVMX86CodeGen.a  lib/libLLVMX86AsmParser.a  lib/libLLVMX86Desc.a  lib/libLLVMX86Disassembler.a  lib/libLLVMX86Info.a  lib/libLLVMNVPTXCodeGen.a  lib/libLLVMNVPTXDesc.a  lib/libLLVMNVPTXInfo.a  lib/libLLVMBitWriter.a  lib/libLLVMCore.a  lib/libLLVMBinaryFormat.a  lib/libLLVMMC.a  lib/libLLVMTarget.a  lib/libLLVMTransformUtils.a  lib/libLLVMAnalysis.a  lib/libLLVMPasses.a  lib/libLLVMIRReader.a  lib/libLLVMObject.a  lib/libLLVMOption.a  lib/libLLVMSupport.a  lib/libLLVMTargetParser.a  lib/libLLVMCodeGen.a  lib/libLLVMLTO.a  lib/libclangBasic.a  lib/libLLVMGlobalISel.a  lib/libLLVMMCDisassembler.a  lib/libLLVMAsmPrinter.a  lib/libLLVMSelectionDAG.a  lib/libLLVMPasses.a  lib/libLLVMCFGuard.a  lib/libLLVMIRPrinter.a  lib/libLLVMCoroutines.a  lib/libLLVMHipStdPar.a  lib/libLLVMCodeGen.a  lib/libLLVMTarget.a  lib/libLLVMCodeGenTypes.a  lib/libLLVMipo.a  lib/libLLVMInstrumentation.a  lib/libLLVMVectorize.a  lib/libLLVMSandboxIR.a  lib/libLLVMObjCARCOpts.a  lib/libLLVMCGData.a  lib/libLLVMBitWriter.a  lib/libLLVMExtensions.a  lib/libLLVMLinker.a  lib/libLLVMFrontendOpenMP.a  lib/libLLVMScalarOpts.a  lib/libLLVMAggressiveInstCombine.a  lib/libLLVMInstCombine.a  lib/libLLVMFrontendOffloading.a  lib/libLLVMTransformUtils.a  lib/libLLVMObjectYAML.a  lib/libLLVMFrontendAtomic.a  lib/libLLVMAnalysis.a  lib/libLLVMProfileData.a  lib/libLLVMSymbolize.a  lib/libLLVMDebugInfoDWARF.a  lib/libLLVMDebugInfoPDB.a  lib/libLLVMObject.a  lib/libLLVMIRReader.a  lib/libLLVMAsmParser.a  lib/libLLVMMCParser.a  lib/libLLVMMC.a  lib/libLLVMBitReader.a  lib/libLLVMCore.a  lib/libLLVMRemarks.a  lib/libLLVMBitstreamReader.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/x86_64-linux-gnu/libz.so && :
ld.lld: error: undefined symbol: llvm::VPUnrollPartAccessor<2u>::getUnrollPart(llvm::VPUser&) const
>>> referenced by VPlanTransforms.cpp
>>>               VPlanTransforms.cpp.o:(llvm::VPlanTransforms::simplifyRecipes(llvm::VPlan&, llvm::Type&) (.localalias)) in archive lib/libLLVMVectorize.a
collect2: error: ld returned 1 exit status
[45/121] Linking CXX executable bin/clang-import-test
ninja: build stopped: subcommand failed.

```

</details>

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

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