`clang-ppc64le-linux-test-suite ` build crashes in CI

[firewave]

https://lab.llvm.org/buildbot/#/builders/230/builds/22628/steps/11/logs/stdio

FAILED: SingleSource/UnitTests/CMakeFiles/matrix-types-spec.dir/matrix-types-spec.cpp.o 
/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/test/build-test-suite/tools/timeit --summary SingleSource/UnitTests/CMakeFiles/matrix-types-spec.dir/matrix-types-spec.cpp.o.time /home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang++ -DNDEBUG  -O3 -DNDEBUG   -w -Werror=date-time -ffp-contract=off -Wno-implicit-function-declaration -Wno-implicit-int -fenable-matrix -MD -MT SingleSource/UnitTests/CMakeFiles/matrix-types-spec.dir/matrix-types-spec.cpp.o -MF SingleSource/UnitTests/CMakeFiles/matrix-types-spec.dir/matrix-types-spec.cpp.o.d -o SingleSource/UnitTests/CMakeFiles/matrix-types-spec.dir/matrix-types-spec.cpp.o -c /home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/test/test-suite/SingleSource/UnitTests/matrix-types-spec.cpp
Unknown rematerializable operation!
UNREACHABLE executed at /home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/llvm-project/llvm/lib/Target/PowerPC/PPCInstrInfo.cpp:1072!
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace, preprocessed source, and associated run script.
Stack dump:
0.	Program arguments: /home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang++ -DNDEBUG -O3 -DNDEBUG -w -Werror=date-time -ffp-contract=off -Wno-implicit-function-declaration -Wno-implicit-int -fenable-matrix -MD -MT SingleSource/UnitTests/CMakeFiles/matrix-types-spec.dir/matrix-types-spec.cpp.o -MF SingleSource/UnitTests/CMakeFiles/matrix-types-spec.dir/matrix-types-spec.cpp.o.d -o SingleSource/UnitTests/CMakeFiles/matrix-types-spec.dir/matrix-types-spec.cpp.o -c /home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/test/test-suite/SingleSource/UnitTests/matrix-types-spec.cpp
1.	<eof> parser at end of file
2.	Code generation
3.	Running pass 'Function Pass Manager' on module '/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/test/test-suite/SingleSource/UnitTests/matrix-types-spec.cpp'.
4.	Running pass 'Greedy Register Allocator' on function '@_Z13testTransposeIfLj31ELj17EEvv'
 #0 0x0000000013b4d500 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x13b4d500)
 #1 0x0000000013b4ae54 llvm::sys::CleanupOnSignal(unsigned long) (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x13b4ae54)
 #2 0x0000000013a65098 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #3 0x00007fff814904d8 (linux-vdso64.so.1+0x4d8)
 #4 0x00007fff80d2a498 raise (/lib64/libc.so.6+0x4a498)
 #5 0x00007fff80d04a54 abort (/lib64/libc.so.6+0x24a54)
 #6 0x0000000013a75240 llvm::llvm_unreachable_internal(char const*, char const*, unsigned int) (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x13a75240)
 #7 0x0000000011cf25d0 llvm::PPCInstrInfo::isReallyTriviallyReMaterializable(llvm::MachineInstr const&) const (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x11cf25d0)
 #8 0x0000000013170074 llvm::LiveRangeEdit::scanRemattable() (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x13170074)
 #9 0x000000001317052c llvm::LiveRangeEdit::anyRematerializable() (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x1317052c)
#10 0x0000000012fa9af4 llvm::SplitEditor::reset(llvm::LiveRangeEdit&, llvm::SplitEditor::ComplementSpillMode) (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x12fa9af4)
#11 0x0000000012ef1a44 llvm::RAGreedy::doRegionSplit(llvm::LiveInterval const&, unsigned int, bool, llvm::SmallVectorImpl<llvm::Register>&) (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x12ef1a44)
#12 0x0000000012efbf48 llvm::RAGreedy::tryRegionSplit(llvm::LiveInterval const&, llvm::AllocationOrder&, llvm::SmallVectorImpl<llvm::Register>&) (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x12efbf48)
#13 0x0000000012eff16c llvm::RAGreedy::selectOrSplitImpl(llvm::LiveInterval const&, llvm::SmallVectorImpl<llvm::Register>&, llvm::SmallSet<llvm::Register, 16u, std::less<llvm::Register>>&, llvm::SmallVector<std::pair<llvm::LiveInterval const*, llvm::MCRegister>, 8u>&, unsigned int) (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x12eff16c)
#14 0x0000000012f00eb4 llvm::RAGreedy::selectOrSplit(llvm::LiveInterval const&, llvm::SmallVectorImpl<llvm::Register>&) (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x12f00eb4)
#15 0x00000000131bb924 llvm::RegAllocBase::allocatePhysRegs() (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x131bb924)
#16 0x0000000012efcccc llvm::RAGreedy::runOnMachineFunction(llvm::MachineFunction&) (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x12efcccc)
#17 0x0000000012d16ec8 llvm::MachineFunctionPass::runOnFunction(llvm::Function&) (.part.78) MachineFunctionPass.cpp:0:0
#18 0x00000000133e52d8 llvm::FPPassManager::runOnFunction(llvm::Function&) (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x133e52d8)
#19 0x00000000133e55f8 llvm::FPPassManager::runOnModule(llvm::Module&) (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x133e55f8)
#20 0x00000000133e6528 llvm::legacy::PassManagerImpl::run(llvm::Module&) (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x133e6528)
#21 0x0000000013e113ac clang::EmitBackendOutput(clang::DiagnosticsEngine&, clang::HeaderSearchOptions const&, clang::CodeGenOptions const&, clang::TargetOptions const&, clang::LangOptions const&, llvm::StringRef, llvm::Module*, clang::BackendAction, llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem>, std::unique_ptr<llvm::raw_pwrite_stream, std::default_delete<llvm::raw_pwrite_stream>>, clang::BackendConsumer*) (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x13e113ac)
#22 0x00000000144b1b8c clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x144b1b8c)
#23 0x0000000016412ab4 clang::ParseAST(clang::Sema&, bool, bool) (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x16412ab4)
#24 0x000000001473bc88 clang::ASTFrontendAction::ExecuteAction() (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x1473bc88)
#25 0x00000000144b0c30 clang::CodeGenAction::ExecuteAction() (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x144b0c30)
#26 0x00000000147419b8 clang::FrontendAction::Execute() (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x147419b8)
#27 0x00000000146c6a00 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x146c6a00)
#28 0x0000000014844b88 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x14844b88)
#29 0x000000001074c62c cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x1074c62c)
#30 0x000000001074283c ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#31 0x00000000144fa4d8 void llvm::function_ref<void ()>::callback_fn<clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const::'lambda'()>(long) Job.cpp:0:0
#32 0x0000000013a65910 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x13a65910)
#33 0x00000000144fae58 clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const (.part.284) Job.cpp:0:0
#34 0x00000000144bfca0 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x144bfca0)
#35 0x00000000144c0848 clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&, bool) const (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x144c0848)
#36 0x00000000144cbbcc clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x144cbbcc)
#37 0x00000000107490cc clang_main(int, char**, llvm::ToolContext const&) (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x107490cc)
#38 0x000000001066e750 main (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x1066e750)
#39 0x00007fff80d0a96c generic_start_main.isra.0 (/lib64/libc.so.6+0x2a96c)
#40 0x00007fff80d0ab04 __libc_start_main (/lib64/libc.so.6+0x2ab04)
clang++: error: clang frontend command failed with exit code 134 (use -v to see invocation)
clang version 18.0.0git (https://github.com/llvm/llvm-project.git f1ea77f7be8acda2aa4b08ba27f454512a872057)
Target: powerpc64le-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin
clang++: note: diagnostic msg: 
********************
PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang++: note: diagnostic msg: /tmp/matrix-types-spec-17d063.cpp
clang++: note: diagnostic msg: /tmp/matrix-types-spec-17d063.sh
clang++: note: diagnostic msg: 
********************

[bzEq]

The instruction trigger the assertion is

  undef %3973.sub_64:vsrc = IMPLICIT_DEF implicit-def %3973:vsrc

reduced.ll.txt

[llvmbot]

@llvm/issue-subscribers-backend-powerpc

Author: Oliver Stöneberg (firewave)

https://lab.llvm.org/buildbot/#/builders/230/builds/22628/steps/11/logs/stdio

FAILED: SingleSource/UnitTests/CMakeFiles/matrix-types-spec.dir/matrix-types-spec.cpp.o 
/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/test/build-test-suite/tools/timeit --summary SingleSource/UnitTests/CMakeFiles/matrix-types-spec.dir/matrix-types-spec.cpp.o.time /home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang++ -DNDEBUG  -O3 -DNDEBUG   -w -Werror=date-time -ffp-contract=off -Wno-implicit-function-declaration -Wno-implicit-int -fenable-matrix -MD -MT SingleSource/UnitTests/CMakeFiles/matrix-types-spec.dir/matrix-types-spec.cpp.o -MF SingleSource/UnitTests/CMakeFiles/matrix-types-spec.dir/matrix-types-spec.cpp.o.d -o SingleSource/UnitTests/CMakeFiles/matrix-types-spec.dir/matrix-types-spec.cpp.o -c /home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/test/test-suite/SingleSource/UnitTests/matrix-types-spec.cpp
Unknown rematerializable operation!
UNREACHABLE executed at /home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/llvm-project/llvm/lib/Target/PowerPC/PPCInstrInfo.cpp:1072!
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace, preprocessed source, and associated run script.
Stack dump:
0.	Program arguments: /home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang++ -DNDEBUG -O3 -DNDEBUG -w -Werror=date-time -ffp-contract=off -Wno-implicit-function-declaration -Wno-implicit-int -fenable-matrix -MD -MT SingleSource/UnitTests/CMakeFiles/matrix-types-spec.dir/matrix-types-spec.cpp.o -MF SingleSource/UnitTests/CMakeFiles/matrix-types-spec.dir/matrix-types-spec.cpp.o.d -o SingleSource/UnitTests/CMakeFiles/matrix-types-spec.dir/matrix-types-spec.cpp.o -c /home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/test/test-suite/SingleSource/UnitTests/matrix-types-spec.cpp
1.	<eof> parser at end of file
2.	Code generation
3.	Running pass 'Function Pass Manager' on module '/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/test/test-suite/SingleSource/UnitTests/matrix-types-spec.cpp'.
4.	Running pass 'Greedy Register Allocator' on function '@<!-- -->_Z13testTransposeIfLj31ELj17EEvv'
 #<!-- -->0 0x0000000013b4d500 llvm::sys::PrintStackTrace(llvm::raw_ostream&amp;, int) (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x13b4d500)
 #<!-- -->1 0x0000000013b4ae54 llvm::sys::CleanupOnSignal(unsigned long) (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x13b4ae54)
 #<!-- -->2 0x0000000013a65098 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #<!-- -->3 0x00007fff814904d8 (linux-vdso64.so.1+0x4d8)
 #<!-- -->4 0x00007fff80d2a498 raise (/lib64/libc.so.6+0x4a498)
 #<!-- -->5 0x00007fff80d04a54 abort (/lib64/libc.so.6+0x24a54)
 #<!-- -->6 0x0000000013a75240 llvm::llvm_unreachable_internal(char const*, char const*, unsigned int) (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x13a75240)
 #<!-- -->7 0x0000000011cf25d0 llvm::PPCInstrInfo::isReallyTriviallyReMaterializable(llvm::MachineInstr const&amp;) const (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x11cf25d0)
 #<!-- -->8 0x0000000013170074 llvm::LiveRangeEdit::scanRemattable() (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x13170074)
 #<!-- -->9 0x000000001317052c llvm::LiveRangeEdit::anyRematerializable() (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x1317052c)
#<!-- -->10 0x0000000012fa9af4 llvm::SplitEditor::reset(llvm::LiveRangeEdit&amp;, llvm::SplitEditor::ComplementSpillMode) (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x12fa9af4)
#<!-- -->11 0x0000000012ef1a44 llvm::RAGreedy::doRegionSplit(llvm::LiveInterval const&amp;, unsigned int, bool, llvm::SmallVectorImpl&lt;llvm::Register&gt;&amp;) (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x12ef1a44)
#<!-- -->12 0x0000000012efbf48 llvm::RAGreedy::tryRegionSplit(llvm::LiveInterval const&amp;, llvm::AllocationOrder&amp;, llvm::SmallVectorImpl&lt;llvm::Register&gt;&amp;) (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x12efbf48)
#<!-- -->13 0x0000000012eff16c llvm::RAGreedy::selectOrSplitImpl(llvm::LiveInterval const&amp;, llvm::SmallVectorImpl&lt;llvm::Register&gt;&amp;, llvm::SmallSet&lt;llvm::Register, 16u, std::less&lt;llvm::Register&gt;&gt;&amp;, llvm::SmallVector&lt;std::pair&lt;llvm::LiveInterval const*, llvm::MCRegister&gt;, 8u&gt;&amp;, unsigned int) (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x12eff16c)
#<!-- -->14 0x0000000012f00eb4 llvm::RAGreedy::selectOrSplit(llvm::LiveInterval const&amp;, llvm::SmallVectorImpl&lt;llvm::Register&gt;&amp;) (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x12f00eb4)
#<!-- -->15 0x00000000131bb924 llvm::RegAllocBase::allocatePhysRegs() (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x131bb924)
#<!-- -->16 0x0000000012efcccc llvm::RAGreedy::runOnMachineFunction(llvm::MachineFunction&amp;) (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x12efcccc)
#<!-- -->17 0x0000000012d16ec8 llvm::MachineFunctionPass::runOnFunction(llvm::Function&amp;) (.part.78) MachineFunctionPass.cpp:0:0
#<!-- -->18 0x00000000133e52d8 llvm::FPPassManager::runOnFunction(llvm::Function&amp;) (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x133e52d8)
#<!-- -->19 0x00000000133e55f8 llvm::FPPassManager::runOnModule(llvm::Module&amp;) (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x133e55f8)
#<!-- -->20 0x00000000133e6528 llvm::legacy::PassManagerImpl::run(llvm::Module&amp;) (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x133e6528)
#<!-- -->21 0x0000000013e113ac clang::EmitBackendOutput(clang::DiagnosticsEngine&amp;, clang::HeaderSearchOptions const&amp;, clang::CodeGenOptions const&amp;, clang::TargetOptions const&amp;, clang::LangOptions const&amp;, llvm::StringRef, llvm::Module*, clang::BackendAction, llvm::IntrusiveRefCntPtr&lt;llvm::vfs::FileSystem&gt;, std::unique_ptr&lt;llvm::raw_pwrite_stream, std::default_delete&lt;llvm::raw_pwrite_stream&gt;&gt;, clang::BackendConsumer*) (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x13e113ac)
#<!-- -->22 0x00000000144b1b8c clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&amp;) (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x144b1b8c)
#<!-- -->23 0x0000000016412ab4 clang::ParseAST(clang::Sema&amp;, bool, bool) (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x16412ab4)
#<!-- -->24 0x000000001473bc88 clang::ASTFrontendAction::ExecuteAction() (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x1473bc88)
#<!-- -->25 0x00000000144b0c30 clang::CodeGenAction::ExecuteAction() (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x144b0c30)
#<!-- -->26 0x00000000147419b8 clang::FrontendAction::Execute() (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x147419b8)
#<!-- -->27 0x00000000146c6a00 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&amp;) (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x146c6a00)
#<!-- -->28 0x0000000014844b88 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x14844b88)
#<!-- -->29 0x000000001074c62c cc1_main(llvm::ArrayRef&lt;char const*&gt;, char const*, void*) (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x1074c62c)
#<!-- -->30 0x000000001074283c ExecuteCC1Tool(llvm::SmallVectorImpl&lt;char const*&gt;&amp;, llvm::ToolContext const&amp;) driver.cpp:0:0
#<!-- -->31 0x00000000144fa4d8 void llvm::function_ref&lt;void ()&gt;::callback_fn&lt;clang::driver::CC1Command::Execute(llvm::ArrayRef&lt;std::optional&lt;llvm::StringRef&gt;&gt;, std::__cxx11::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt;&gt;*, bool*) const::'lambda'()&gt;(long) Job.cpp:0:0
#<!-- -->32 0x0000000013a65910 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref&lt;void ()&gt;) (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x13a65910)
#<!-- -->33 0x00000000144fae58 clang::driver::CC1Command::Execute(llvm::ArrayRef&lt;std::optional&lt;llvm::StringRef&gt;&gt;, std::__cxx11::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt;&gt;*, bool*) const (.part.284) Job.cpp:0:0
#<!-- -->34 0x00000000144bfca0 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&amp;, clang::driver::Command const*&amp;, bool) const (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x144bfca0)
#<!-- -->35 0x00000000144c0848 clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&amp;, llvm::SmallVectorImpl&lt;std::pair&lt;int, clang::driver::Command const*&gt;&gt;&amp;, bool) const (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x144c0848)
#<!-- -->36 0x00000000144cbbcc clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&amp;, llvm::SmallVectorImpl&lt;std::pair&lt;int, clang::driver::Command const*&gt;&gt;&amp;) (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x144cbbcc)
#<!-- -->37 0x00000000107490cc clang_main(int, char**, llvm::ToolContext const&amp;) (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x107490cc)
#<!-- -->38 0x000000001066e750 main (/home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin/clang+++0x1066e750)
#<!-- -->39 0x00007fff80d0a96c generic_start_main.isra.0 (/lib64/libc.so.6+0x2a96c)
#<!-- -->40 0x00007fff80d0ab04 __libc_start_main (/lib64/libc.so.6+0x2ab04)
clang++: error: clang frontend command failed with exit code 134 (use -v to see invocation)
clang version 18.0.0git (https://github.com/llvm/llvm-project.git f1ea77f7be8acda2aa4b08ba27f454512a872057)
Target: powerpc64le-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/buildbots/ppc64le-clang-test-suite/clang-ppc64le-test-suite/build/bin
clang++: note: diagnostic msg: 
********************
PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang++: note: diagnostic msg: /tmp/matrix-types-spec-17d063.cpp
clang++: note: diagnostic msg: /tmp/matrix-types-spec-17d063.sh
clang++: note: diagnostic msg: 
********************

[bzEq]

@stefanp-ibm has kindly reverted #75271 . @arsenm @stefanp-ibm I think we should discuss further on how to handle PPC's failure and reapply #75271.

[arsenm]

This is a PPC bug; instead of dying on unexpected opcodes it should return the default (or at least a conservative) result.

[bzEq]

I've testd test-suite on ppc64le via

commit a95f787f152f230916d5fe012b0ea4c07171dab3 (HEAD -> reland-coalescer-undef)
Author: Kai Luo <lkail@cn.ibm.com>
Date:   Tue Dec 19 09:30:02 2023 +0000

    Revert "Revert "Reapply "RegisterCoalescer: Add implicit-def of super register when coalescing SUBREG_TO_REG"""
    
    This reverts commit c398fa009a47eb24f88383d5e911e59e70f8db86.

locally. All tests passed.

PASS: test-suite :: SingleSource/UnitTests/matrix-types-spec.test (463 of 570)
...
Total Discovered Tests: 570
  Passed: 570 (100.00%)

@arsenm I think the Coalescer change can be relanded at least from PPC's side.

[stefanp-synopsys]

@stefanp-ibm has kindly reverted #75271 . @arsenm @stefanp-ibm I think we should discuss further on how to handle PPC's failure and reapply #75271.

Thank you for fixing this!