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

Wed Apr 16 12:26:46 PDT 2025

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `ppc64le-lld-multistage-test` running on `ppc64le-lld-multistage-test` while building `clang,compiler-rt,llvm` at step 12 "build-stage2-unified-tree".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/168/builds/10952

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

```
Step 12 (build-stage2-unified-tree) failure: build (failure)
...
21.396 [1/8/16] Building CXX object tools/clang/utils/TableGen/CMakeFiles/clang-tblgen.dir/ClangOptionDocEmitter.cpp.o
22.506 [1/7/17] Building CXX object tools/clang/utils/TableGen/CMakeFiles/clang-tblgen.dir/ClangOpenCLBuiltinEmitter.cpp.o
40.116 [1/6/18] Building CXX object tools/clang/utils/TableGen/CMakeFiles/clang-tblgen.dir/RISCVVEmitter.cpp.o
40.716 [1/5/19] Building CXX object tools/clang/utils/TableGen/CMakeFiles/clang-tblgen.dir/SveEmitter.cpp.o
41.746 [1/4/20] Building CXX object tools/clang/utils/TableGen/CMakeFiles/clang-tblgen.dir/MveEmitter.cpp.o
43.906 [1/3/21] Building CXX object tools/clang/utils/TableGen/CMakeFiles/clang-tblgen.dir/ClangDiagnosticsEmitter.cpp.o
71.975 [1/2/22] Building CXX object tools/clang/utils/TableGen/CMakeFiles/clang-tblgen.dir/NeonEmitter.cpp.o
96.603 [1/1/23] Building CXX object tools/clang/utils/TableGen/CMakeFiles/clang-tblgen.dir/ClangAttrEmitter.cpp.o
96.667 [0/1/24] Linking CXX executable bin/clang-tblgen
135.026 [4054/668/1830] 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/workers/ppc64le-lld-multistage-test/ppc64le-lld-multistage-test/install/stage1/bin/clang++ -DGTEST_HAS_RTTI=0 -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-lld-multistage-test/ppc64le-lld-multistage-test/build/stage2/lib/CodeGen/SelectionDAG -I/home/buildbots/llvm-external-buildbots/workers/ppc64le-lld-multistage-test/ppc64le-lld-multistage-test/llvm-project/llvm/lib/CodeGen/SelectionDAG -I/home/buildbots/llvm-external-buildbots/workers/ppc64le-lld-multistage-test/ppc64le-lld-multistage-test/build/stage2/include -I/home/buildbots/llvm-external-buildbots/workers/ppc64le-lld-multistage-test/ppc64le-lld-multistage-test/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  -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-lld-multistage-test/ppc64le-lld-multistage-test/llvm-project/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
/home/buildbots/llvm-external-buildbots/workers/ppc64le-lld-multistage-test/ppc64le-lld-multistage-test/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-lld-multistage-test/ppc64le-lld-multistage-test/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-lld-multistage-test/ppc64le-lld-multistage-test/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.
175.284 [4054/51/2447] Building CXX object unittests/Transforms/Vectorize/SandboxVectorizer/CMakeFiles/SandboxVectorizerTests.dir/DependencyGraphTest.cpp.o
175.546 [4054/49/2449] Building CXX object lib/ObjCopy/CMakeFiles/LLVMObjCopy.dir/ELF/ELFObject.cpp.o
175.562 [4054/48/2450] Building CXX object unittests/Transforms/Instrumentation/CMakeFiles/InstrumentationTests.dir/PGOInstrumentationTest.cpp.o
175.611 [4054/47/2451] Building CXX object lib/CodeGen/GlobalISel/CMakeFiles/LLVMGlobalISel.dir/LegalizerHelper.cpp.o
175.935 [4054/46/2452] Building CXX object lib/LTO/CMakeFiles/LLVMLTO.dir/LTO.cpp.o
175.944 [4054/45/2453] Building CXX object lib/Transforms/IPO/CMakeFiles/LLVMipo.dir/SampleProfile.cpp.o
176.008 [4054/44/2454] Building CXX object unittests/Support/CMakeFiles/SupportTests.dir/MathExtrasTest.cpp.o
176.266 [4054/43/2455] Building CXX object unittests/ProfileData/CMakeFiles/ProfileDataTests.dir/MemProfTest.cpp.o
176.526 [4054/42/2456] Building CXX object unittests/Transforms/Instrumentation/CMakeFiles/InstrumentationTests.dir/MemProfUseTest.cpp.o
176.891 [4054/41/2457] Building CXX object lib/CodeGen/GlobalISel/CMakeFiles/LLVMGlobalISel.dir/CombinerHelper.cpp.o
177.220 [4054/40/2458] Building CXX object lib/CodeGen/AsmPrinter/CMakeFiles/LLVMAsmPrinter.dir/CodeViewDebug.cpp.o
177.287 [4054/39/2459] Building CXX object lib/CodeGen/GlobalISel/CMakeFiles/LLVMGlobalISel.dir/IRTranslator.cpp.o
177.288 [4054/38/2460] Building CXX object unittests/IR/CMakeFiles/IRTests.dir/PatternMatch.cpp.o
177.401 [4054/37/2461] Building CXX object lib/Bitcode/Writer/CMakeFiles/LLVMBitWriter.dir/BitcodeWriter.cpp.o
177.534 [4054/36/2462] Building CXX object lib/Transforms/Scalar/CMakeFiles/LLVMScalarOpts.dir/NewGVN.cpp.o
177.598 [4054/35/2463] Building CXX object lib/Transforms/IPO/CMakeFiles/LLVMipo.dir/Attributor.cpp.o
177.644 [4054/34/2464] Building CXX object unittests/Support/CMakeFiles/SupportTests.dir/VirtualFileSystemTest.cpp.o
177.861 [4054/33/2465] Building CXX object lib/ObjectYAML/CMakeFiles/LLVMObjectYAML.dir/ELFYAML.cpp.o
178.602 [4054/32/2466] Building CXX object unittests/IR/CMakeFiles/IRTests.dir/MetadataTest.cpp.o
178.645 [4054/31/2467] Building CXX object lib/Bitcode/Reader/CMakeFiles/LLVMBitReader.dir/BitcodeReader.cpp.o
179.219 [4054/30/2468] Building CXX object tools/llvm-profdata/CMakeFiles/llvm-profdata.dir/llvm-profdata.cpp.o
179.564 [4054/29/2469] Building CXX object lib/CodeGen/CMakeFiles/LLVMCodeGen.dir/MachinePipeliner.cpp.o
180.064 [4054/28/2470] Building CXX object unittests/Transforms/Vectorize/CMakeFiles/VectorizeTests.dir/VPlanTest.cpp.o
180.375 [4054/27/2471] Building CXX object unittests/TargetParser/CMakeFiles/TargetParserTests.dir/TargetParserTest.cpp.o
180.675 [4054/26/2472] Building CXX object lib/Transforms/Utils/CMakeFiles/LLVMTransformUtils.dir/SimplifyCFG.cpp.o

```

</details>

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