[AArch64][SVE] fatal error: error in backend: Cannot select: 0x4c53a330: i64 = vscale Constant:i64<16>

[k-arrows]

Reproducer:
https://godbolt.org/z/57KE1Krz5

#include <arm_sve.h>

long test_builtin_vectorelements_sve8() {
  return __builtin_vectorelements(svuint8_t);
}

Backtrace:

fatal error: error in backend: Cannot select: 0x451d27e0: i64 = vscale Constant:i64<16>, example.cpp:4:10
In function: test_builtin_vectorelements_sve8
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: /opt/compiler-explorer/clang-trunk/bin/clang++ -g -o /app/output.s -fno-verbose-asm -S -target aarch64-linux-gnu --gcc-toolchain=/opt/compiler-explorer/arm64/gcc-12.2.0/aarch64-unknown-linux-gnu --sysroot=/opt/compiler-explorer/arm64/gcc-12.2.0/aarch64-unknown-linux-gnu/aarch64-unknown-linux-gnu/sysroot -fcolor-diagnostics -fno-crash-diagnostics -x c -march=armv8.2-a+nosve <source>
1.	<eof> parser at end of file
2.	Code generation
3.	Running pass 'Function Pass Manager' on module '<source>'.
4.	Running pass 'AArch64 Instruction Selection' on function '@test_builtin_vectorelements_sve8'
 #0 0x0000000003d0b648 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3d0b648)
 #1 0x0000000003d0901c llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3d0901c)
 #2 0x0000000003c58793 llvm::CrashRecoveryContext::HandleExit(int) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3c58793)
 #3 0x0000000003d0086e llvm::sys::Process::Exit(int, bool) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3d0086e)
 #4 0x0000000000db97bb LLVMErrorHandler(void*, char const*, bool) cc1_main.cpp:0:0
 #5 0x0000000003c62733 llvm::report_fatal_error(llvm::Twine const&, bool) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3c62733)
 #6 0x000000000527d3ea llvm::SelectionDAGISel::CannotYetSelect(llvm::SDNode*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x527d3ea)
 #7 0x0000000005281e19 llvm::SelectionDAGISel::SelectCodeCommon(llvm::SDNode*, unsigned char const*, unsigned int) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5281e19)
 #8 0x0000000000f67737 (anonymous namespace)::AArch64DAGToDAGISel::Select(llvm::SDNode*) AArch64ISelDAGToDAG.cpp:0:0
 #9 0x000000000527afd4 llvm::SelectionDAGISel::DoInstructionSelection() (/opt/compiler-explorer/clang-trunk/bin/clang+++0x527afd4)
#10 0x0000000005288db2 llvm::SelectionDAGISel::CodeGenAndEmitDAG() (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5288db2)
#11 0x000000000528b735 llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x528b735)
#12 0x000000000528d5c6 llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x528d5c6)
#13 0x000000000527ab61 llvm::SelectionDAGISelLegacy::runOnMachineFunction(llvm::MachineFunction&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x527ab61)
#14 0x00000000030d048d llvm::MachineFunctionPass::runOnFunction(llvm::Function&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x30d048d)
#15 0x000000000364aba2 llvm::FPPassManager::runOnFunction(llvm::Function&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x364aba2)
#16 0x000000000364ad21 llvm::FPPassManager::runOnModule(llvm::Module&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x364ad21)
#17 0x000000000364c667 llvm::legacy::PassManagerImpl::run(llvm::Module&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x364c667)
#18 0x0000000003fae77d clang::emitBackendOutput(clang::CompilerInstance&, clang::CodeGenOptions&, 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*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3fae77d)
#19 0x00000000045ed43c clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x45ed43c)
#20 0x000000000627a27c clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x627a27c)
#21 0x00000000045edc2d clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-trunk/bin/clang+++0x45edc2d)
#22 0x00000000048fb75a clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-trunk/bin/clang+++0x48fb75a)
#23 0x000000000487543b clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x487543b)
#24 0x00000000049eea83 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x49eea83)
#25 0x0000000000dbb815 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0xdbb815)
#26 0x0000000000db37bd ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#27 0x00000000046607c9 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
#28 0x0000000003c58693 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3c58693)
#29 0x00000000046609e9 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.0) Job.cpp:0:0
#30 0x00000000046235bd clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-trunk/bin/clang+++0x46235bd)
#31 0x0000000004624571 clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&, bool) const (/opt/compiler-explorer/clang-trunk/bin/clang+++0x4624571)
#32 0x000000000462e02c clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x462e02c)
#33 0x0000000000db8021 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0xdb8021)
#34 0x0000000000c6c514 main (/opt/compiler-explorer/clang-trunk/bin/clang+++0xc6c514)
#35 0x00007b83fe629d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#36 0x00007b83fe629e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#37 0x0000000000db3255 _start (/opt/compiler-explorer/clang-trunk/bin/clang+++0xdb3255)
clang++: error: clang frontend command failed with exit code 70 (use -v to see invocation)
Compiler returned: 70

[llvmbot]

@llvm/issue-subscribers-backend-aarch64

Author: None (k-arrows)

Reproducer: https://godbolt.org/z/57KE1Krz5 ```c #include <arm_sve.h>

long test_builtin_vectorelements_sve8() {
return __builtin_vectorelements(svuint8_t);
}

Backtrace:
```console
fatal error: error in backend: Cannot select: 0x451d27e0: i64 = vscale Constant:i64<16>, example.cpp:4:10
In function: test_builtin_vectorelements_sve8
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: /opt/compiler-explorer/clang-trunk/bin/clang++ -g -o /app/output.s -fno-verbose-asm -S -target aarch64-linux-gnu --gcc-toolchain=/opt/compiler-explorer/arm64/gcc-12.2.0/aarch64-unknown-linux-gnu --sysroot=/opt/compiler-explorer/arm64/gcc-12.2.0/aarch64-unknown-linux-gnu/aarch64-unknown-linux-gnu/sysroot -fcolor-diagnostics -fno-crash-diagnostics -x c -march=armv8.2-a+nosve <source>
1.	<eof> parser at end of file
2.	Code generation
3.	Running pass 'Function Pass Manager' on module '<source>'.
4.	Running pass 'AArch64 Instruction Selection' on function '@<!-- -->test_builtin_vectorelements_sve8'
 #<!-- -->0 0x0000000003d0b648 llvm::sys::PrintStackTrace(llvm::raw_ostream&amp;, int) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3d0b648)
 #<!-- -->1 0x0000000003d0901c llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3d0901c)
 #<!-- -->2 0x0000000003c58793 llvm::CrashRecoveryContext::HandleExit(int) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3c58793)
 #<!-- -->3 0x0000000003d0086e llvm::sys::Process::Exit(int, bool) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3d0086e)
 #<!-- -->4 0x0000000000db97bb LLVMErrorHandler(void*, char const*, bool) cc1_main.cpp:0:0
 #<!-- -->5 0x0000000003c62733 llvm::report_fatal_error(llvm::Twine const&amp;, bool) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3c62733)
 #<!-- -->6 0x000000000527d3ea llvm::SelectionDAGISel::CannotYetSelect(llvm::SDNode*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x527d3ea)
 #<!-- -->7 0x0000000005281e19 llvm::SelectionDAGISel::SelectCodeCommon(llvm::SDNode*, unsigned char const*, unsigned int) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5281e19)
 #<!-- -->8 0x0000000000f67737 (anonymous namespace)::AArch64DAGToDAGISel::Select(llvm::SDNode*) AArch64ISelDAGToDAG.cpp:0:0
 #<!-- -->9 0x000000000527afd4 llvm::SelectionDAGISel::DoInstructionSelection() (/opt/compiler-explorer/clang-trunk/bin/clang+++0x527afd4)
#<!-- -->10 0x0000000005288db2 llvm::SelectionDAGISel::CodeGenAndEmitDAG() (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5288db2)
#<!-- -->11 0x000000000528b735 llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&amp;) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x528b735)
#<!-- -->12 0x000000000528d5c6 llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&amp;) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x528d5c6)
#<!-- -->13 0x000000000527ab61 llvm::SelectionDAGISelLegacy::runOnMachineFunction(llvm::MachineFunction&amp;) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x527ab61)
#<!-- -->14 0x00000000030d048d llvm::MachineFunctionPass::runOnFunction(llvm::Function&amp;) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x30d048d)
#<!-- -->15 0x000000000364aba2 llvm::FPPassManager::runOnFunction(llvm::Function&amp;) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x364aba2)
#<!-- -->16 0x000000000364ad21 llvm::FPPassManager::runOnModule(llvm::Module&amp;) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x364ad21)
#<!-- -->17 0x000000000364c667 llvm::legacy::PassManagerImpl::run(llvm::Module&amp;) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x364c667)
#<!-- -->18 0x0000000003fae77d clang::emitBackendOutput(clang::CompilerInstance&amp;, clang::CodeGenOptions&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*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3fae77d)
#<!-- -->19 0x00000000045ed43c clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&amp;) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x45ed43c)
#<!-- -->20 0x000000000627a27c clang::ParseAST(clang::Sema&amp;, bool, bool) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x627a27c)
#<!-- -->21 0x00000000045edc2d clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-trunk/bin/clang+++0x45edc2d)
#<!-- -->22 0x00000000048fb75a clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-trunk/bin/clang+++0x48fb75a)
#<!-- -->23 0x000000000487543b clang::CompilerInstance::ExecuteAction(clang::FrontendAction&amp;) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x487543b)
#<!-- -->24 0x00000000049eea83 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x49eea83)
#<!-- -->25 0x0000000000dbb815 cc1_main(llvm::ArrayRef&lt;char const*&gt;, char const*, void*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0xdbb815)
#<!-- -->26 0x0000000000db37bd ExecuteCC1Tool(llvm::SmallVectorImpl&lt;char const*&gt;&amp;, llvm::ToolContext const&amp;) driver.cpp:0:0
#<!-- -->27 0x00000000046607c9 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
#<!-- -->28 0x0000000003c58693 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref&lt;void ()&gt;) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3c58693)
#<!-- -->29 0x00000000046609e9 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.0) Job.cpp:0:0
#<!-- -->30 0x00000000046235bd clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&amp;, clang::driver::Command const*&amp;, bool) const (/opt/compiler-explorer/clang-trunk/bin/clang+++0x46235bd)
#<!-- -->31 0x0000000004624571 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 (/opt/compiler-explorer/clang-trunk/bin/clang+++0x4624571)
#<!-- -->32 0x000000000462e02c clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&amp;, llvm::SmallVectorImpl&lt;std::pair&lt;int, clang::driver::Command const*&gt;&gt;&amp;) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x462e02c)
#<!-- -->33 0x0000000000db8021 clang_main(int, char**, llvm::ToolContext const&amp;) (/opt/compiler-explorer/clang-trunk/bin/clang+++0xdb8021)
#<!-- -->34 0x0000000000c6c514 main (/opt/compiler-explorer/clang-trunk/bin/clang+++0xc6c514)
#<!-- -->35 0x00007b83fe629d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#<!-- -->36 0x00007b83fe629e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#<!-- -->37 0x0000000000db3255 _start (/opt/compiler-explorer/clang-trunk/bin/clang+++0xdb3255)
clang++: error: clang frontend command failed with exit code 70 (use -v to see invocation)
Compiler returned: 70

[k-arrows]

The reproducer here is reduced from clang/test/CodeGen/builtin_vectorelements.c

[k-arrows]

Of course, specifying +sve is the right way to compile, but the compiler shouldn't crash.

[davemgreen]

We should get the same error in clang as if a scalable vector was used in a context without SVE.
https://godbolt.org/z/6q9cnbEMe

error: SVE vector type 'svuint8_t' (aka '__SVUint8_t') cannot be used in a target without sve
    4 |   svuint8_t x;