| Issue |
172628
|
| Summary |
[RISC-V] title: Clang crashes when running pass 'Post-RA pseudo instruction expansion pass' on function '@_Z1dv'
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
ams-x9v2b7kq
|
## [RISC-V] title: Clang crashes when running pass 'Post-RA pseudo instruction expansion pass' on function '@_Z1dv'
### code link: https://godbolt.org/z/8rEznGKf4
```
#include <riscv_vector.h>
uint8_t a[1]; int32_t b[1]; int32_t c[1];
void d() {
for (size_t e = 0;;) {
size_t f(5);
vuint8mf8_t g = __riscv_vle8_v_u8mf8(&a[e], f);
vbool64_t i = __riscv_vmseq_vx_u8mf8_b64(g, 1, f);
vint32mf2x5_t j = __riscv_vlseg5e32_v_i32mf2x5_mu(
i,
__riscv_vcreate_v_i32mf2x5(
__riscv_vmv_v_x_i32mf2(0, __riscv_vsetvlmax_e16mf4()),
__riscv_vmv_v_x_i32mf2(0, __riscv_vsetvlmax_e16mf4()),
__riscv_vmv_v_x_i32mf2(0, __riscv_vsetvlmax_e16mf4()),
__riscv_vmv_v_x_i32mf2(0, __riscv_vsetvlmax_e16mf4()),
__riscv_vmv_v_x_i32mf2(0, __riscv_vsetvlmax_e16mf4())),
&b[e], f);
vint32mf2_t k = __riscv_vget_v_i32mf2x5_i32mf2(j, 0);
vuint32mf2_t l = __riscv_vsll_vx_u32mf2(__riscv_vid_v_u32mf2(f), 2, f);
__riscv_vsuxei32(&c[e], l, k, f);
}
}
```
```
$ clang++ -O3 -march=rv64gcv_zvfh -mabi=lp64d test.cpp -o a.out
```
### crash backtrace
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 riscv64-unknown-linux-gnu -march=rv64gc -mabi=lp64d --gcc-toolchain=/opt/compiler-explorer/riscv64/gcc-14.2.0/riscv64-unknown-linux-gnu --sysroot=/opt/compiler-explorer/riscv64/gcc-14.2.0/riscv64-unknown-linux-gnu/riscv64-unknown-linux-gnu/sysroot -fcolor-diagnostics -fno-crash-diagnostics -O3 -march=rv64gcv_zvfh <source>
1. <eof> parser at end of file
2. Code generation
3. Running pass 'Function Pass Manager' on module '<source>'.
4. Running pass 'Post-RA pseudo instruction expansion pass' on function '@_Z1dv'
#0 0x0000000003d10978 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3d10978)
#1 0x0000000003d0e34c llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3d0e34c)
#2 0x0000000003c552d8 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
#3 0x00007fda72042520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
#4 0x00000000021fcfbd llvm::RISCVInstrInfo::copyPhysRegVector(llvm::MachineBasicBlock&, llvm::MachineInstrBundleIterator<llvm::MachineInstr, false>, llvm::DebugLoc const&, llvm::MCRegister, llvm::MCRegister, bool, llvm::TargetRegisterClass const*) const (/opt/compiler-explorer/clang-trunk/bin/clang+++0x21fcfbd)
#5 0x00000000021fe86a llvm::RISCVInstrInfo::copyPhysReg(llvm::MachineBasicBlock&, llvm::MachineInstrBundleIterator<llvm::MachineInstr, false>, llvm::DebugLoc const&, llvm::Register, llvm::Register, bool, bool, bool) const (/opt/compiler-explorer/clang-trunk/bin/clang+++0x21fe86a)
#6 0x0000000003385e86 llvm::TargetInstrInfo::lowerCopy(llvm::MachineInstr*, llvm::TargetRegisterInfo const*) const (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3385e86)
#7 0x0000000002ff1988 (anonymous namespace)::ExpandPostRA::run(llvm::MachineFunction&) (.constprop.0) ExpandPostRAPseudos.cpp:0:0
#8 0x0000000002ff1ba4 (anonymous namespace)::ExpandPostRALegacy::runOnMachineFunction(llvm::MachineFunction&) ExpandPostRAPseudos.cpp:0:0
#9 0x000000000310bbcd llvm::MachineFunctionPass::runOnFunction(llvm::Function&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x310bbcd)
#10 0x000000000366dfc2 llvm::FPPassManager::runOnFunction(llvm::Function&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x366dfc2)
#11 0x000000000366e251 llvm::FPPassManager::runOnModule(llvm::Module&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x366e251)
#12 0x000000000366fac7 llvm::legacy::PassManagerImpl::run(llvm::Module&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x366fac7)
#13 0x0000000003fa69bb 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+++0x3fa69bb)
#14 0x00000000045d9b2b clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x45d9b2b)
#15 0x00000000062235bc clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x62235bc)
#16 0x00000000045da685 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-trunk/bin/clang+++0x45da685)
#17 0x00000000048ea59a clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-trunk/bin/clang+++0x48ea59a)
#18 0x00000000048684eb clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x48684eb)
#19 0x00000000049e071b clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x49e071b)
#20 0x0000000000dccd85 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0xdccd85)
#21 0x0000000000dc4b7b ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&, llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem>) driver.cpp:0:0
#22 0x0000000000dc4c1d int llvm::function_ref<int (llvm::SmallVectorImpl<char const*>&)>::callback_fn<clang_main(int, char**, llvm::ToolContext const&)::'lambda'(llvm::SmallVectorImpl<char const*>&)>(long, llvm::SmallVectorImpl<char const*>&) driver.cpp:0:0
#23 0x0000000004654e19 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
#24 0x0000000003c556f3 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3c556f3)
#25 0x0000000004655039 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
#26 0x0000000004617ae2 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-trunk/bin/clang+++0x4617ae2)
#27 0x00000000046189c1 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+++0x46189c1)
#28 0x00000000046214ac clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x46214ac)
#29 0x0000000000dc9649 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0xdc9649)
#30 0x0000000000c7ac34 main (/opt/compiler-explorer/clang-trunk/bin/clang+++0xc7ac34)
#31 0x00007fda72029d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#32 0x00007fda72029e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#33 0x0000000000dc4615 _start (/opt/compiler-explorer/clang-trunk/bin/clang+++0xdc4615)
clang++: error: clang frontend command failed with exit code 139 (use -v to see invocation)
Compiler returned: 139
```
```
$ clang-22 --version
clang version 22.0.0git (https://github.com/llvm/llvm-project.git d502ff094937ff9e532a675df11d55bb0b134066)
Target: riscv64-unknown-unknown-elf
Thread model: posix
InstalledDir: /home/2025-compiler/gcc-16-20251214/bin
```
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