[clang] [compiler-rt] [llvm] [SystemZ] Add support for half (fp16) (PR #109164)

Wed Apr 16 13:54:10 PDT 2025

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clang-ppc64le-rhel` running on `ppc64le-clang-rhel-test` while building `clang,compiler-rt,llvm` at step 5 "build-unified-tree".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/145/builds/6404

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

```
Step 5 (build-unified-tree) failure: build (failure)
...
51.327 [1441/192/4872] Building CXX object tools/clang/tools/extra/clang-change-namespace/CMakeFiles/obj.clangChangeNamespace.dir/ChangeNamespace.cpp.o
51.333 [1440/192/4873] Building CXX object tools/clang/tools/extra/clang-doc/support/CMakeFiles/obj.clangDocSupport.dir/File.cpp.o
51.338 [1439/192/4874] Building CXX object tools/clang/tools/extra/clang-include-fixer/CMakeFiles/obj.clangIncludeFixer.dir/IncludeFixerContext.cpp.o
51.351 [1438/192/4875] Building CXX object tools/clang/tools/extra/clang-include-fixer/CMakeFiles/obj.clangIncludeFixer.dir/InMemorySymbolIndex.cpp.o
51.357 [1437/192/4876] Building CXX object tools/clang/tools/extra/clang-include-fixer/CMakeFiles/obj.clangIncludeFixer.dir/FuzzySymbolIndex.cpp.o
51.363 [1436/192/4877] Building CXX object tools/clang/tools/extra/clang-include-fixer/CMakeFiles/obj.clangIncludeFixer.dir/YamlSymbolIndex.cpp.o
51.373 [1435/192/4878] Building CXX object tools/clang/tools/extra/clang-include-fixer/find-all-symbols/CMakeFiles/obj.findAllSymbols.dir/HeaderMapCollector.cpp.o
51.378 [1434/192/4879] Building CXX object tools/clang/tools/extra/clang-include-fixer/find-all-symbols/CMakeFiles/obj.findAllSymbols.dir/PathConfig.cpp.o
51.385 [1433/192/4880] Building CXX object tools/clang/tools/extra/clang-include-fixer/find-all-symbols/CMakeFiles/obj.findAllSymbols.dir/STLPostfixHeaderMap.cpp.o
51.394 [1432/192/4881] Building CXX object lib/CodeGen/SelectionDAG/CMakeFiles/LLVMSelectionDAG.dir/LegalizeDAG.cpp.o
FAILED: lib/CodeGen/SelectionDAG/CMakeFiles/LLVMSelectionDAG.dir/LegalizeDAG.cpp.o 
ccache /home/buildbots/llvm-external-buildbots/clang.19.1.7/bin/clang++ --gcc-toolchain=/gcc-toolchain/usr -DGTEST_HAS_RTTI=0 -DLLVM_EXPORTS -D_DEBUG -D_GLIBCXX_ASSERTIONS -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-rhel-test/clang-ppc64le-rhel/build/lib/CodeGen/SelectionDAG -I/home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-rhel-test/clang-ppc64le-rhel/llvm-project/llvm/lib/CodeGen/SelectionDAG -I/home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-rhel-test/clang-ppc64le-rhel/build/include -I/home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-rhel-test/clang-ppc64le-rhel/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 -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -O3 -DNDEBUG -std=c++17 -fPIC  -fno-exceptions -funwind-tables -fno-rtti -UNDEBUG -MD -MT lib/CodeGen/SelectionDAG/CMakeFiles/LLVMSelectionDAG.dir/LegalizeDAG.cpp.o -MF lib/CodeGen/SelectionDAG/CMakeFiles/LLVMSelectionDAG.dir/LegalizeDAG.cpp.o.d -o lib/CodeGen/SelectionDAG/CMakeFiles/LLVMSelectionDAG.dir/LegalizeDAG.cpp.o -c /home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-rhel-test/clang-ppc64le-rhel/llvm-project/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
/home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-rhel-test/clang-ppc64le-rhel/llvm-project/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp:5471:3: error: unannotated fall-through between switch labels [-Werror,-Wimplicit-fallthrough]
 5471 |   case ISD::STRICT_FMAXIMUM:
      |   ^
/home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-rhel-test/clang-ppc64le-rhel/llvm-project/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp:5471:3: note: insert 'LLVM_FALLTHROUGH;' to silence this warning
 5471 |   case ISD::STRICT_FMAXIMUM:
      |   ^
      |   LLVM_FALLTHROUGH; 
/home/buildbots/llvm-external-buildbots/workers/ppc64le-clang-rhel-test/clang-ppc64le-rhel/llvm-project/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp:5471:3: note: insert 'break;' to avoid fall-through
 5471 |   case ISD::STRICT_FMAXIMUM:
      |   ^
      |   break; 
1 error generated.
51.397 [1432/191/4882] Building CXX object tools/clang/tools/extra/clang-tidy/bugprone/CMakeFiles/obj.clangTidyBugproneModule.dir/UnsafeFunctionsCheck.cpp.o
51.403 [1432/190/4883] Building CXX object tools/clang/tools/extra/clang-tidy/cert/CMakeFiles/obj.clangTidyCERTModule.dir/DefaultOperatorNewAlignmentCheck.cpp.o
51.407 [1432/189/4884] Building CXX object tools/clang/tools/extra/clang-tidy/cppcoreguidelines/CMakeFiles/obj.clangTidyCppCoreGuidelinesModule.dir/InitVariablesCheck.cpp.o
51.414 [1432/188/4885] Building CXX object tools/clang/tools/extra/clang-tidy/utils/CMakeFiles/obj.clangTidyUtils.dir/Matchers.cpp.o
51.421 [1432/187/4886] Building CXX object tools/clang/tools/extra/clang-tidy/utils/CMakeFiles/obj.clangTidyUtils.dir/NamespaceAliaser.cpp.o
51.426 [1432/186/4887] Building CXX object tools/clang/tools/extra/clang-tidy/utils/CMakeFiles/obj.clangTidyUtils.dir/UsingInserter.cpp.o
51.429 [1432/185/4888] Building CXX object tools/clang/tools/extra/clang-include-fixer/CMakeFiles/obj.clangIncludeFixer.dir/SymbolIndexManager.cpp.o
51.432 [1432/184/4889] Building CXX object tools/clang/tools/extra/clang-include-fixer/find-all-symbols/CMakeFiles/obj.findAllSymbols.dir/FindAllMacros.cpp.o
51.435 [1432/183/4890] Building CXX object tools/clang/tools/extra/clang-include-fixer/find-all-symbols/CMakeFiles/obj.findAllSymbols.dir/SymbolInfo.cpp.o
51.438 [1432/182/4891] Building CXX object tools/clang/tools/extra/clangd/support/CMakeFiles/obj.clangdSupport.dir/Context.cpp.o
51.441 [1432/181/4892] Building CXX object tools/clang/tools/extra/clangd/support/CMakeFiles/obj.clangdSupport.dir/Markup.cpp.o
51.446 [1432/180/4893] Building CXX object tools/clang/tools/extra/clangd/support/CMakeFiles/obj.clangdSupport.dir/Path.cpp.o
51.449 [1432/179/4894] Building CXX object tools/clang/tools/extra/clangd/support/CMakeFiles/obj.clangdSupport.dir/Cancellation.cpp.o
51.451 [1432/178/4895] Building CXX object tools/clang/tools/extra/clangd/support/CMakeFiles/obj.clangdSupport.dir/FileCache.cpp.o
51.455 [1432/177/4896] Building CXX object tools/clang/tools/extra/clangd/support/CMakeFiles/obj.clangdSupport.dir/Lex.cpp.o
51.457 [1432/176/4897] Building CXX object tools/clang/tools/extra/clangd/support/CMakeFiles/obj.clangdSupport.dir/Logger.cpp.o
51.460 [1432/175/4898] Building CXX object tools/clang/tools/extra/clangd/support/CMakeFiles/obj.clangdSupport.dir/MemoryTree.cpp.o
51.463 [1432/174/4899] Building CXX object tools/clang/tools/extra/clangd/support/CMakeFiles/obj.clangdSupport.dir/Shutdown.cpp.o
51.465 [1432/173/4900] Building CXX object tools/clang/tools/extra/clangd/support/CMakeFiles/obj.clangdSupport.dir/ThreadCrashReporter.cpp.o
51.470 [1432/172/4901] Building CXX object tools/clang/tools/extra/clang-tidy/bugprone/CMakeFiles/obj.clangTidyBugproneModule.dir/MacroParenthesesCheck.cpp.o
51.473 [1432/171/4902] Building CXX object tools/clang/tools/extra/clangd/support/CMakeFiles/obj.clangdSupport.dir/DirectiveTree.cpp.o
51.486 [1432/170/4903] Building CXX object tools/clang/tools/extra/clang-tidy/CMakeFiles/obj.clangTidy.dir/ClangTidy.cpp.o
51.489 [1432/169/4904] Building CXX object tools/clang/tools/extra/clangd/support/CMakeFiles/obj.clangdSupport.dir/Threading.cpp.o
51.495 [1432/168/4905] Building CXX object tools/clang/tools/extra/clangd/support/CMakeFiles/obj.clangdSupport.dir/Bracket.cpp.o
51.516 [1432/167/4906] Building CXX object tools/clang/tools/extra/clangd/support/CMakeFiles/obj.clangdSupport.dir/ThreadsafeFS.cpp.o

```

</details>

https://github.com/llvm/llvm-project/pull/109164