[llvm] [X86] computeKnownBitsForTargetNode - add X86ISD::FANDN coverage and X86SelectionDAGTest infrastructure (PR #181994)

Wed Feb 18 08:12:55 PST 2026

mbrkusanin wrote:

> LLVM Buildbot has detected a new failure on builder `openmp-offload-amdgpu-runtime-2` running on `rocm-worker-hw-02` while building `llvm` at step 8 "Add check check-llvm".
> 
> Full details are available at: https://lab.llvm.org/buildbot/#/builders/10/builds/22870
> Here is the relevant piece of the build log for the reference
> 
> ```
> Step 8 (Add check check-llvm) failure: test (failure)
> ...
> [779/789] Linking CXX executable unittests/Transforms/Vectorize/SandboxVectorizer/SandboxVectorizerTests
> [780/789] Linking CXX executable unittests/tools/llvm-mca/LLVMMCATests
> [781/789] Linking CXX executable unittests/Transforms/Utils/UtilsTests
> [782/789] Linking CXX executable unittests/Frontend/LLVMFrontendTests
> [783/789] Linking CXX executable unittests/tools/llvm-exegesis/LLVMExegesisTests
> [784/789] Linking CXX executable unittests/IR/IRTests
> [785/789] Linking CXX executable unittests/ADT/ADTTests
> [786/789] Linking CXX executable unittests/Support/SupportTests
> [787/789] Building CXX object unittests/Target/X86/CMakeFiles/X86Tests.dir/X86SelectionDAGTest.cpp.o
> [788/789] Linking CXX executable unittests/Target/X86/X86Tests
> FAILED: unittests/Target/X86/X86Tests 
> : && /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-array-bounds -Wno-stringop-overread -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,--gc-sections unittests/Target/X86/CMakeFiles/X86Tests.dir/MachineSizeOptsTest.cpp.o unittests/Target/X86/CMakeFiles/X86Tests.dir/TernlogTest.cpp.o unittests/Target/X86/CMakeFiles/X86Tests.dir/X86SelectionDAGTest.cpp.o -o unittests/Target/X86/X86Tests  -Wl,-rpath,/home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.build/lib  lib/libLLVMMIRParser.so.23.0git  lib/libLLVMPasses.so.23.0git  lib/libLLVMX86CodeGen.so.23.0git  lib/libLLVMX86Desc.so.23.0git  lib/libLLVMX86Info.so.23.0git  lib/libllvm_gtest_main.so.23.0git  lib/libllvm_gtest.so.23.0git  lib/libLLVMCodeGen.so.23.0git  lib/libLLVMInstCombine.so.23.0git  lib/libLLVMCodeGenTypes.so.23.0git  lib/libLLVMTarget.so.23.0git  lib/libLLVMAnalysis.so.23.0git  lib/libLLVMAsmParser.so.23.0git  lib/libLLVMCore.so.23.0git  lib/libLLVMMC.so.23.0git  lib/libLLVMTargetParser.so.23.0git  lib/libLLVMSupport.so.23.0git  -Wl,-rpath-link,/home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.build/lib && :
> /usr/bin/ld: unittests/Target/X86/CMakeFiles/X86Tests.dir/X86SelectionDAGTest.cpp.o: undefined reference to symbol '_ZN4llvm12SelectionDAG13getConstantFPEdRKNS_5SDLocENS_3EVTEb'
> /usr/bin/ld: /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.build/lib/libLLVMSelectionDAG.so.23.0git: error adding symbols: DSO missing from command line
> collect2: error: ld returned 1 exit status
> ninja: build stopped: subcommand failed.
> ```

Fix: https://github.com/llvm/llvm-project/pull/182053

https://github.com/llvm/llvm-project/pull/181994