[llvm] [AArch64][SME] Implement the SME ABI (ZA state management) in Machine IR (PR #149062)

Tue Aug 19 02:35:13 PDT 2025

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `lldb-remote-linux-ubuntu` running on `as-builder-9` while building `llvm` at step 7 "build-default".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/195/builds/13431

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

```
Step 7 (build-default) failure: cmake (failure)
...
36.926 [576/66/4905] Building CXX object tools/clang/tools/libclang/CMakeFiles/libclang.dir/Obsolete.cpp.o
36.956 [575/66/4906] Building CXX object tools/lldb/source/Plugins/Disassembler/LLVMC/CMakeFiles/lldbPluginDisassemblerLLVMC.dir/DisassemblerLLVMC.cpp.o
37.011 [574/66/4907] Building CXX object tools/lldb/source/API/CMakeFiles/liblldb.dir/SBAddress.cpp.o
37.017 [573/66/4908] Building CXX object tools/clang/tools/libclang/CMakeFiles/libclang.dir/CIndexer.cpp.o
37.029 [572/66/4909] Building CXX object tools/lldb/source/API/CMakeFiles/liblldb.dir/SBAddressRange.cpp.o
37.038 [571/66/4910] Building CXX object tools/lldb/source/API/CMakeFiles/liblldb.dir/SBAddressRangeList.cpp.o
37.054 [570/66/4911] Building CXX object lib/Target/AArch64/CMakeFiles/LLVMAArch64CodeGen.dir/AArch64CompressJumpTables.cpp.o
37.057 [569/66/4912] Building CXX object tools/lldb/source/API/CMakeFiles/liblldb.dir/SBAttachInfo.cpp.o
37.066 [568/66/4913] Building CXX object tools/lldb/source/API/CMakeFiles/liblldb.dir/SBBlock.cpp.o
37.086 [567/66/4914] Building CXX object lib/Target/AArch64/CMakeFiles/LLVMAArch64CodeGen.dir/MachineSMEABIPass.cpp.o
FAILED: lib/Target/AArch64/CMakeFiles/LLVMAArch64CodeGen.dir/MachineSMEABIPass.cpp.o 
ccache /usr/bin/c++ -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/buildbot/worker/as-builder-9/lldb-remote-linux-ubuntu/build/lib/Target/AArch64 -I/home/buildbot/worker/as-builder-9/lldb-remote-linux-ubuntu/llvm-project/llvm/lib/Target/AArch64 -I/home/buildbot/worker/as-builder-9/lldb-remote-linux-ubuntu/build/include -I/home/buildbot/worker/as-builder-9/lldb-remote-linux-ubuntu/llvm-project/llvm/include -D__OPTIMIZE__ -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-noexcept-type -Wdelete-non-virtual-dtor -Wsuggest-override -Wno-comment -Wno-misleading-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/MachineSMEABIPass.cpp.o -MF lib/Target/AArch64/CMakeFiles/LLVMAArch64CodeGen.dir/MachineSMEABIPass.cpp.o.d -o lib/Target/AArch64/CMakeFiles/LLVMAArch64CodeGen.dir/MachineSMEABIPass.cpp.o -c /home/buildbot/worker/as-builder-9/lldb-remote-linux-ubuntu/llvm-project/llvm/lib/Target/AArch64/MachineSMEABIPass.cpp
/home/buildbot/worker/as-builder-9/lldb-remote-linux-ubuntu/llvm-project/llvm/lib/Target/AArch64/MachineSMEABIPass.cpp:255: error: declaration of ‘llvm::EdgeBundles* {anonymous}::MachineSMEABI::EdgeBundles’ changes meaning of ‘EdgeBundles’ [-Wchanges-meaning]
  255 |   EdgeBundles *EdgeBundles = nullptr;
      | 
/home/buildbot/worker/as-builder-9/lldb-remote-linux-ubuntu/llvm-project/llvm/lib/Target/AArch64/MachineSMEABIPass.cpp:255: note: used here to mean ‘class llvm::EdgeBundles’
In file included from /home/buildbot/worker/as-builder-9/lldb-remote-linux-ubuntu/llvm-project/llvm/lib/Target/AArch64/MachineSMEABIPass.cpp:62:
/home/buildbot/worker/as-builder-9/lldb-remote-linux-ubuntu/llvm-project/llvm/include/llvm/CodeGen/EdgeBundles.h:27: note: declared here
   27 | class EdgeBundles {
      | 
37.088 [567/65/4915] Building CXX object tools/lldb/source/API/CMakeFiles/liblldb.dir/SBBreakpointLocation.cpp.o
37.090 [567/64/4916] Building CXX object tools/lldb/source/API/CMakeFiles/liblldb.dir/SBBreakpoint.cpp.o
37.100 [567/63/4917] Building CXX object tools/lldb/source/API/CMakeFiles/liblldb.dir/SBBreakpointName.cpp.o
37.104 [567/62/4918] Building CXX object tools/clang/tools/clang-repl/CMakeFiles/clang-repl.dir/ClangRepl.cpp.o
37.107 [567/61/4919] Building CXX object lib/Target/AArch64/MCTargetDesc/CMakeFiles/LLVMAArch64Desc.dir/AArch64MCAsmInfo.cpp.o
37.171 [567/60/4920] Building CXX object tools/clang/tools/libclang/CMakeFiles/libclang.dir/CIndexUSRs.cpp.o
37.188 [567/59/4921] Building CXX object tools/clang/tools/libclang/CMakeFiles/libclang.dir/CIndexCodeCompletion.cpp.o
37.231 [567/58/4922] Building CXX object tools/clang/tools/libclang/CMakeFiles/libclang.dir/CIndexHigh.cpp.o
37.290 [567/57/4923] Building CXX object lib/Target/AArch64/CMakeFiles/LLVMAArch64CodeGen.dir/AArch64TargetObjectFile.cpp.o
37.342 [567/56/4924] Building CXX object tools/clang/tools/libclang/CMakeFiles/libclang.dir/CIndexInclusionStack.cpp.o
37.351 [567/55/4925] Building CXX object tools/clang/tools/libclang/CMakeFiles/libclang.dir/CXComment.cpp.o
37.387 [567/54/4926] Building CXX object lib/Target/AArch64/CMakeFiles/LLVMAArch64CodeGen.dir/SMEPeepholeOpt.cpp.o
37.476 [567/53/4927] Building CXX object lib/Target/AArch64/CMakeFiles/LLVMAArch64CodeGen.dir/AArch64CollectLOH.cpp.o
37.493 [567/52/4928] Building CXX object tools/clang/tools/libclang/CMakeFiles/libclang.dir/CIndex.cpp.o
37.552 [567/51/4929] Building CXX object lib/Target/AArch64/MCTargetDesc/CMakeFiles/LLVMAArch64Desc.dir/AArch64MCExpr.cpp.o
37.568 [567/50/4930] Building CXX object tools/clang/tools/libclang/CMakeFiles/libclang.dir/CXSourceLocation.cpp.o
37.631 [567/49/4931] Linking CXX static library lib/libclangAST.a
37.701 [567/48/4932] Building CXX object tools/clang/tools/libclang/CMakeFiles/libclang.dir/CXStoredDiagnostic.cpp.o
/home/buildbot/worker/as-builder-9/lldb-remote-linux-ubuntu/llvm-project/clang/tools/libclang/CXStoredDiagnostic.cpp: In member function ‘virtual CXString clang::CXStoredDiagnostic::getFixIt(unsigned int, CXSourceRange*) const’:
/home/buildbot/worker/as-builder-9/lldb-remote-linux-ubuntu/llvm-project/clang/tools/libclang/CXStoredDiagnostic.cpp:103:20: warning: possibly dangling reference to a temporary [-Wdangling-reference]
  103 |   const FixItHint &Hint = Diag.fixit_begin()[FixIt];
      |                    ^~~~
/home/buildbot/worker/as-builder-9/lldb-remote-linux-ubuntu/llvm-project/clang/tools/libclang/CXStoredDiagnostic.cpp:103:51: note: the temporary was destroyed at the end of the full expression ‘(&((const clang::CXStoredDiagnostic*)this)->clang::CXStoredDiagnostic::Diag)->clang::StoredDiagnostic::fixit_begin().__gnu_cxx::__normal_iterator<const clang::FixItHint*, std::vector<clang::FixItHint, std::allocator<clang::FixItHint> > >::operator[](((__gnu_cxx::__normal_iterator<const clang::FixItHint*, std::vector<clang::FixItHint, std::allocator<clang::FixItHint> > >::difference_type)FixIt))’
  103 |   const FixItHint &Hint = Diag.fixit_begin()[FixIt];
      |                                                   ^
37.731 [567/47/4933] Building CXX object tools/clang/tools/libclang/CMakeFiles/libclang.dir/CXString.cpp.o
37.811 [567/46/4934] Building CXX object lib/Target/AArch64/MCTargetDesc/CMakeFiles/LLVMAArch64Desc.dir/AArch64ELFStreamer.cpp.o
In file included from /usr/include/c++/13/algorithm:60,
                 from /home/buildbot/worker/as-builder-9/lldb-remote-linux-ubuntu/llvm-project/llvm/include/llvm/ADT/SmallVector.h:19,

```

</details>

https://github.com/llvm/llvm-project/pull/149062