[Mlir-commits] [mlir] [mlir][scf] Add parallelLoopUnrollByFactors() (PR #163806)

Fri Oct 24 02:13:22 PDT 2025

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `mlir-nvidia` running on `mlir-nvidia` while building `mlir` at step 6 "build-check-mlir-build-only".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/138/builds/20873

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

```
Step 6 (build-check-mlir-build-only) failure: build (failure)
...
127.933 [361/16/5134] Building CXX object tools/mlir/test/lib/Dialect/Vector/CMakeFiles/MLIRVectorTestPasses.dir/TestVectorTransforms.cpp.o
127.934 [360/16/5135] Linking CXX shared library lib/libMyExtensionCh4.so.22.0git
127.941 [359/16/5136] Creating library symlink lib/libMyExtensionCh4.so
127.958 [359/15/5137] Building CXX object tools/yaml2obj/CMakeFiles/yaml2obj.dir/yaml2obj.cpp.o
127.994 [358/15/5138] Linking CXX executable bin/llc
127.998 [358/14/5139] Linking CXX executable bin/lli
128.048 [358/13/5140] Linking CXX executable bin/yaml2obj
128.304 [358/12/5141] Building CXX object tools/mlir/lib/Dialect/SparseTensor/Transforms/CMakeFiles/obj.MLIRSparseTensorTransforms.dir/SparseTensorPasses.cpp.o
128.331 [358/11/5142] Building CXX object tools/mlir/lib/Dialect/SCF/IR/CMakeFiles/obj.MLIRSCFDialect.dir/SCF.cpp.o
128.430 [357/11/5143] Linking CXX shared library lib/libMLIRSCFDialect.so.22.0git
FAILED: lib/libMLIRSCFDialect.so.22.0git 
: && /usr/bin/clang++ -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 -Wno-pass-failed -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -Wundef -Werror=mismatched-tags -Werror=global-constructors -O3 -DNDEBUG  -Wl,-z,defs -Wl,-z,nodelete -fuse-ld=lld -Wl,--color-diagnostics   -Wl,--gc-sections -shared -Wl,-soname,libMLIRSCFDialect.so.22.0git -o lib/libMLIRSCFDialect.so.22.0git tools/mlir/lib/Dialect/SCF/IR/CMakeFiles/obj.MLIRSCFDialect.dir/SCF.cpp.o tools/mlir/lib/Dialect/SCF/IR/CMakeFiles/obj.MLIRSCFDialect.dir/DeviceMappingInterface.cpp.o tools/mlir/lib/Dialect/SCF/IR/CMakeFiles/obj.MLIRSCFDialect.dir/ValueBoundsOpInterfaceImpl.cpp.o  -Wl,-rpath,"\$ORIGIN/../lib:/vol/worker/mlir-nvidia/mlir-nvidia/llvm.obj/lib:"  lib/libMLIRControlFlowDialect.so.22.0git  lib/libMLIRTensorDialect.so.22.0git  lib/libMLIRAffineDialect.so.22.0git  lib/libMLIRMemRefDialect.so.22.0git  lib/libMLIRValueBoundsOpInterface.so.22.0git  lib/libMLIRAnalysis.so.22.0git  lib/libMLIRLoopLikeInterface.so.22.0git  lib/libMLIRFunctionInterfaces.so.22.0git  lib/libMLIRSideEffectInterfaces.so.22.0git  lib/libMLIRCallInterfaces.so.22.0git  lib/libMLIRDataLayoutInterfaces.so.22.0git  lib/libMLIRPresburger.so.22.0git  lib/libMLIRControlFlowInterfaces.so.22.0git  lib/libMLIRInferStridedMetadataInterface.so.22.0git  lib/libMLIRMemOpInterfaces.so.22.0git  lib/libMLIRMemorySlotInterfaces.so.22.0git  lib/libMLIRArithUtils.so.22.0git  lib/libMLIRDialectUtils.so.22.0git  lib/libMLIRComplexDialect.so.22.0git  lib/libMLIRArithDialect.so.22.0git  lib/libMLIRCastInterfaces.so.22.0git  lib/libMLIRInferIntRangeCommon.so.22.0git  lib/libMLIRInferIntRangeInterface.so.22.0git  lib/libMLIRUBDialect.so.22.0git  lib/libMLIRDialect.so.22.0git  lib/libMLIRInferTypeOpInterface.so.22.0git  lib/libMLIRDestinationStyleOpInterface.so.22.0git  lib/libMLIRParallelCombiningOpInterface.so.22.0git  lib/libMLIRRuntimeVerifiableOpInterface.so.22.0git  lib/libMLIRShapedOpInterfaces.so.22.0git  lib/libMLIRViewLikeInterface.so.22.0git  lib/libMLIRIR.so.22.0git  lib/libMLIRSupport.so.22.0git  lib/libLLVMSupport.so.22.0git  -Wl,-rpath-link,/vol/worker/mlir-nvidia/mlir-nvidia/llvm.obj/lib && :
ld.lld: error: undefined symbol: mlir::scf::computeUbMinusLb(mlir::Value, mlir::Value, bool)
>>> referenced by SCF.cpp
>>>               tools/mlir/lib/Dialect/SCF/IR/CMakeFiles/obj.MLIRSCFDialect.dir/SCF.cpp.o:(mlir::scf::ForOp::getStaticTripCount())
>>> referenced by SCF.cpp
>>>               tools/mlir/lib/Dialect/SCF/IR/CMakeFiles/obj.MLIRSCFDialect.dir/SCF.cpp.o:(mlir::scf::ForallOp::promoteIfSingleIteration(mlir::RewriterBase&))
>>> referenced by SCF.cpp
>>>               tools/mlir/lib/Dialect/SCF/IR/CMakeFiles/obj.MLIRSCFDialect.dir/SCF.cpp.o:((anonymous namespace)::ForallOpSingleOrZeroIterationDimsFolder::matchAndRewrite(mlir::scf::ForallOp, mlir::PatternRewriter&) const)
>>> referenced 2 more times
clang: error: linker command failed with exit code 1 (use -v to see invocation)
128.979 [357/10/5144] Building CXX object tools/mlir/test/lib/Dialect/Linalg/CMakeFiles/MLIRLinalgTestPasses.dir/TestDataLayoutPropagation.cpp.o
129.523 [357/9/5145] Building CXX object tools/mlir/test/lib/Dialect/SCF/CMakeFiles/MLIRSCFTestPasses.dir/TestParallelLoopUnrolling.cpp.o
129.668 [357/8/5146] Building CXX object tools/mlir/test/lib/Dialect/SCF/CMakeFiles/MLIRSCFTestPasses.dir/TestLoopUnrolling.cpp.o
129.817 [357/7/5147] Building CXX object tools/mlir/test/lib/Dialect/Linalg/CMakeFiles/MLIRLinalgTestPasses.dir/TestPadFusion.cpp.o
130.029 [357/6/5148] Building CXX object tools/mlir/unittests/ExecutionEngine/CMakeFiles/MLIRExecutionEngineTests.dir/Invoke.cpp.o
130.500 [357/5/5149] Building CXX object tools/mlir/tools/mlir-opt/CMakeFiles/MLIRMlirOptMain.dir/mlir-opt.cpp.o
130.626 [357/4/5150] Building CXX object tools/mlir/tools/mlir-opt/CMakeFiles/mlir-opt.dir/mlir-opt.cpp.o
132.156 [357/3/5151] Building CXX object tools/mlir/lib/Dialect/SparseTensor/Pipelines/CMakeFiles/obj.MLIRSparseTensorPipelines.dir/SparseTensorPipelines.cpp.o
132.990 [357/2/5152] Building CXX object tools/mlir/test/lib/Dialect/SCF/CMakeFiles/MLIRSCFTestPasses.dir/TestSCFUtils.cpp.o
136.667 [357/1/5153] Building CXX object tools/mlir/test/lib/Dialect/NVGPU/CMakeFiles/MLIRNVGPUTestPasses.dir/TestNVGPUTransforms.cpp.o
ninja: build stopped: subcommand failed.

```

</details>

https://github.com/llvm/llvm-project/pull/163806