[llvm] [AArch64][GISel] Fix lowering of fp16 intrinsics (PR #130156)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `sanitizer-x86_64-linux-android` running on `sanitizer-buildbot-android` while building `llvm` at step 2 "annotate".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/186/builds/7304

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

```
Step 2 (annotate) failure: 'python ../sanitizer_buildbot/sanitizers/zorg/buildbot/builders/sanitizers/buildbot_selector.py' (failure)
...
[2142/5429] Building CXX object lib/Target/AArch64/MCTargetDesc/CMakeFiles/LLVMAArch64Desc.dir/AArch64MCTargetDesc.cpp.o
[2143/5429] Building CXX object lib/Target/AArch64/MCTargetDesc/CMakeFiles/LLVMAArch64Desc.dir/AArch64TargetStreamer.cpp.o
[2144/5429] Building CXX object lib/Target/AArch64/MCTargetDesc/CMakeFiles/LLVMAArch64Desc.dir/AArch64WinCOFFObjectWriter.cpp.o
[2145/5429] Building CXX object lib/Target/AArch64/MCTargetDesc/CMakeFiles/LLVMAArch64Desc.dir/AArch64WinCOFFStreamer.cpp.o
[2146/5429] Building CXX object lib/Target/AArch64/TargetInfo/CMakeFiles/LLVMAArch64Info.dir/AArch64TargetInfo.cpp.o
[2147/5429] Building CXX object lib/Target/AArch64/Utils/CMakeFiles/LLVMAArch64Utils.dir/AArch64BaseInfo.cpp.o
[2148/5429] Building CXX object lib/Target/AArch64/Utils/CMakeFiles/LLVMAArch64Utils.dir/AArch64SMEAttributes.cpp.o
[2149/5429] Building AMDGPUGenDisassemblerTables.inc...
[2150/5429] Building AMDGPUGenMCCodeEmitter.inc...
[2151/5429] Building CXX object lib/Target/AArch64/CMakeFiles/LLVMAArch64CodeGen.dir/GISel/AArch64RegisterBankInfo.cpp.o
FAILED: lib/Target/AArch64/CMakeFiles/LLVMAArch64CodeGen.dir/GISel/AArch64RegisterBankInfo.cpp.o 
CCACHE_CPP2=yes CCACHE_HASHDIR=yes /usr/bin/ccache /var/lib/buildbot/sanitizer-buildbot6/sanitizer-x86_64-linux-android/build/llvm_build0/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/var/lib/buildbot/sanitizer-buildbot6/sanitizer-x86_64-linux-android/build/llvm_build64/lib/Target/AArch64 -I/var/lib/buildbot/sanitizer-buildbot6/sanitizer-x86_64-linux-android/build/llvm-project/llvm/lib/Target/AArch64 -I/var/lib/buildbot/sanitizer-buildbot6/sanitizer-x86_64-linux-android/build/llvm_build64/include -I/var/lib/buildbot/sanitizer-buildbot6/sanitizer-x86_64-linux-android/build/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 -fvisibility=hidden  -fno-exceptions -funwind-tables -fno-rtti -UNDEBUG -MD -MT lib/Target/AArch64/CMakeFiles/LLVMAArch64CodeGen.dir/GISel/AArch64RegisterBankInfo.cpp.o -MF lib/Target/AArch64/CMakeFiles/LLVMAArch64CodeGen.dir/GISel/AArch64RegisterBankInfo.cpp.o.d -o lib/Target/AArch64/CMakeFiles/LLVMAArch64CodeGen.dir/GISel/AArch64RegisterBankInfo.cpp.o -c /var/lib/buildbot/sanitizer-buildbot6/sanitizer-x86_64-linux-android/build/llvm-project/llvm/lib/Target/AArch64/GISel/AArch64RegisterBankInfo.cpp
/var/lib/buildbot/sanitizer-buildbot6/sanitizer-x86_64-linux-android/build/llvm-project/llvm/lib/Target/AArch64/GISel/AArch64RegisterBankInfo.cpp:571:3: error: unannotated fall-through between switch labels [-Werror,-Wimplicit-fallthrough]
  571 |   default:
      |   ^
/var/lib/buildbot/sanitizer-buildbot6/sanitizer-x86_64-linux-android/build/llvm-project/llvm/lib/Target/AArch64/GISel/AArch64RegisterBankInfo.cpp:571:3: note: insert 'break;' to avoid fall-through
  571 |   default:
      |   ^
      |   break; 
1 error generated.
[2152/5429] Building AMDGPUGenMCPseudoLowering.inc...
[2153/5429] Building AMDGPUGenPostLegalizeGICombiner.inc...
[2154/5429] Building AMDGPUGenPreLegalizeGICombiner.inc...
[2155/5429] Building AMDGPUGenAsmWriter.inc...
[2156/5429] Building AMDGPUGenRegBankGICombiner.inc...
[2157/5429] Building AMDGPUGenAsmMatcher.inc...
[2158/5429] Building AMDGPUGenDAGISel.inc...
[2159/5429] Building AMDGPUGenGlobalISel.inc...
[2160/5429] Building AMDGPUGenInstrInfo.inc...
[2161/5429] Building AMDGPUGenSearchableTables.inc...
[2162/5429] Building AMDGPUGenSubtargetInfo.inc...
[2163/5429] Building AMDGPUGenRegisterBank.inc...
[2164/5429] Building AMDGPUGenRegisterInfo.inc...
ninja: build stopped: subcommand failed.

How to reproduce locally: https://github.com/google/sanitizers/wiki/SanitizerBotReproduceBuild


@@@STEP_FAILURE@@@

@@@STEP_FAILURE@@@

@@@STEP_FAILURE@@@
Step 8 (bootstrap clang) failure: bootstrap clang (failure)
...
[2142/5429] Building CXX object lib/Target/AArch64/MCTargetDesc/CMakeFiles/LLVMAArch64Desc.dir/AArch64MCTargetDesc.cpp.o
[2143/5429] Building CXX object lib/Target/AArch64/MCTargetDesc/CMakeFiles/LLVMAArch64Desc.dir/AArch64TargetStreamer.cpp.o
[2144/5429] Building CXX object lib/Target/AArch64/MCTargetDesc/CMakeFiles/LLVMAArch64Desc.dir/AArch64WinCOFFObjectWriter.cpp.o
[2145/5429] Building CXX object lib/Target/AArch64/MCTargetDesc/CMakeFiles/LLVMAArch64Desc.dir/AArch64WinCOFFStreamer.cpp.o
[2146/5429] Building CXX object lib/Target/AArch64/TargetInfo/CMakeFiles/LLVMAArch64Info.dir/AArch64TargetInfo.cpp.o
[2147/5429] Building CXX object lib/Target/AArch64/Utils/CMakeFiles/LLVMAArch64Utils.dir/AArch64BaseInfo.cpp.o
[2148/5429] Building CXX object lib/Target/AArch64/Utils/CMakeFiles/LLVMAArch64Utils.dir/AArch64SMEAttributes.cpp.o
[2149/5429] Building AMDGPUGenDisassemblerTables.inc...
[2150/5429] Building AMDGPUGenMCCodeEmitter.inc...
[2151/5429] Building CXX object lib/Target/AArch64/CMakeFiles/LLVMAArch64CodeGen.dir/GISel/AArch64RegisterBankInfo.cpp.o
FAILED: lib/Target/AArch64/CMakeFiles/LLVMAArch64CodeGen.dir/GISel/AArch64RegisterBankInfo.cpp.o 
CCACHE_CPP2=yes CCACHE_HASHDIR=yes /usr/bin/ccache /var/lib/buildbot/sanitizer-buildbot6/sanitizer-x86_64-linux-android/build/llvm_build0/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/var/lib/buildbot/sanitizer-buildbot6/sanitizer-x86_64-linux-android/build/llvm_build64/lib/Target/AArch64 -I/var/lib/buildbot/sanitizer-buildbot6/sanitizer-x86_64-linux-android/build/llvm-project/llvm/lib/Target/AArch64 -I/var/lib/buildbot/sanitizer-buildbot6/sanitizer-x86_64-linux-android/build/llvm_build64/include -I/var/lib/buildbot/sanitizer-buildbot6/sanitizer-x86_64-linux-android/build/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 -fvisibility=hidden  -fno-exceptions -funwind-tables -fno-rtti -UNDEBUG -MD -MT lib/Target/AArch64/CMakeFiles/LLVMAArch64CodeGen.dir/GISel/AArch64RegisterBankInfo.cpp.o -MF lib/Target/AArch64/CMakeFiles/LLVMAArch64CodeGen.dir/GISel/AArch64RegisterBankInfo.cpp.o.d -o lib/Target/AArch64/CMakeFiles/LLVMAArch64CodeGen.dir/GISel/AArch64RegisterBankInfo.cpp.o -c /var/lib/buildbot/sanitizer-buildbot6/sanitizer-x86_64-linux-android/build/llvm-project/llvm/lib/Target/AArch64/GISel/AArch64RegisterBankInfo.cpp
/var/lib/buildbot/sanitizer-buildbot6/sanitizer-x86_64-linux-android/build/llvm-project/llvm/lib/Target/AArch64/GISel/AArch64RegisterBankInfo.cpp:571:3: error: unannotated fall-through between switch labels [-Werror,-Wimplicit-fallthrough]
  571 |   default:
      |   ^
/var/lib/buildbot/sanitizer-buildbot6/sanitizer-x86_64-linux-android/build/llvm-project/llvm/lib/Target/AArch64/GISel/AArch64RegisterBankInfo.cpp:571:3: note: insert 'break;' to avoid fall-through
  571 |   default:
      |   ^
      |   break; 
1 error generated.
[2152/5429] Building AMDGPUGenMCPseudoLowering.inc...
[2153/5429] Building AMDGPUGenPostLegalizeGICombiner.inc...
[2154/5429] Building AMDGPUGenPreLegalizeGICombiner.inc...
[2155/5429] Building AMDGPUGenAsmWriter.inc...
[2156/5429] Building AMDGPUGenRegBankGICombiner.inc...
[2157/5429] Building AMDGPUGenAsmMatcher.inc...
[2158/5429] Building AMDGPUGenDAGISel.inc...
[2159/5429] Building AMDGPUGenGlobalISel.inc...
[2160/5429] Building AMDGPUGenInstrInfo.inc...
[2161/5429] Building AMDGPUGenSearchableTables.inc...
[2162/5429] Building AMDGPUGenSubtargetInfo.inc...
[2163/5429] Building AMDGPUGenRegisterBank.inc...
[2164/5429] Building AMDGPUGenRegisterInfo.inc...
ninja: build stopped: subcommand failed.

How to reproduce locally: https://github.com/google/sanitizers/wiki/SanitizerBotReproduceBuild




program finished with exit code 2
elapsedTime=117.179369

```

</details>

https://github.com/llvm/llvm-project/pull/130156