| Issue |
172480
|
| Summary |
Clang ICE: assertion failure in X86FloatingPoint.cpp when using x87 constraints with inline assembly
|
| Labels |
clang:frontend,
crash-on-invalid
|
| Assignees |
|
| Reporter |
AbyssStaror
|
### Link for quick verification: https://godbolt.org/z/4Ka3MbWe1
```c
#include <stdio.h>
float inline_float_op_asm(float x)
{
float y;
__asm__ volatile (
"fmadd %1, %2, %0"
: "=t"(y)
: "f"(x), "f"(x * 3.0F)
:
);
return y;
}
```
Go back to clang-3.6: https://godbolt.org/z/a8jKGYTKT
Seem a bit similar to [149371](https://github.com/llvm/llvm-project/issues/149371)
## Stack dump:
```
clang-21: /workspace/install/llvm/src/llvm-project/llvm/lib/Target/X86/X86FloatingPoint.cpp:1684: void {anonymous}::FPS::handleSpecialFP(llvm::MachineBasicBlock::iterator&): Assertion `(1 << getFPReg(MI.getOperand(I)) & STDefs) == 0 && "Operands with constraint \"f\" cannot overlap with defs"' failed.
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: /workspace/install/llvm/build_21.1.4/bin/clang-21 -cc1 -triple x86_64-unknown-linux-gnu -O3 -emit-obj -dumpdir a- -disable-free -clear-ast-before-backend -main-file-name 23420.fuzz -mrelocation-model pic -pic-level 2 -pic-is-pie -mframe-pointer=none -fmath-errno -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -fdebug-compilation-dir=/workspace/exps/featurefuzz/random_combine_feature_set_1_exp -fcoverage-compilation-dir=/workspace/exps/featurefuzz/random_combine_feature_set_1_exp -resource-dir /workspace/install/llvm/build_21.1.4/lib/clang/21 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/13/../../../../include/x86_64-linux-gnu/c++/13 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/backward -internal-isystem /workspace/install/llvm/build_21.1.4/lib/clang/21/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/13/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -std=c++20 -fdeprecated-macro -ferror-limit 19 -fmessage-length=159 -fgnuc-version=4.2.1 -fno-implicit-modules -fskip-odr-check-in-gmf -fcxx-exceptions -fexceptions -fcolor-diagnostics -vectorize-loops -vectorize-slp -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/23420-bd59e7.o -x c++ /workspace/exps/featurefuzz/generate_feature_fine_tuning_qwen_4b_choose_2_4_exp/bugs/23420.fuzz
1. <eof> parser at end of file
2. Code generation
3. Running pass 'Function Pass Manager' on module '/workspace/exps/featurefuzz/generate_feature_fine_tuning_qwen_4b_choose_2_4_exp/bugs/23420.fuzz'.
4. Running pass 'X86 FP Stackifier' on function '@_Z19inline_float_op_asmf'
#0 0x000055555ebe5c2a llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/workspace/install/llvm/build_21.1.4/bin/clang-21+0x9691c2a)
#1 0x000055555ebe6457 PrintStackTraceSignalHandler(void*) Signals.cpp:0:0
#2 0x000055555ebdff57 llvm::sys::RunSignalHandlers() (/workspace/install/llvm/build_21.1.4/bin/clang-21+0x968bf57)
#3 0x000055555ebe01c7 SignalHandler(int, siginfo_t*, void*) Signals.cpp:0:0
#4 0x00007ffff7a3b330 (/lib/x86_64-linux-gnu/libc.so.6+0x45330)
#5 0x00007ffff7a94b2c __pthread_kill_implementation ./nptl/pthread_kill.c:44:76
#6 0x00007ffff7a94b2c __pthread_kill_internal ./nptl/pthread_kill.c:78:10
#7 0x00007ffff7a94b2c pthread_kill ./nptl/pthread_kill.c:89:10
#8 0x00007ffff7a3b27e raise ./signal/../sysdeps/posix/raise.c:27:6
#9 0x00007ffff7a1e8ff abort ./stdlib/abort.c:81:7
#10 0x00007ffff7a1e81b _nl_load_domain ./intl/loadmsgcat.c:1177:9
#11 0x00007ffff7a31517 (/lib/x86_64-linux-gnu/libc.so.6+0x3b517)
#12 0x000055555c8bc311 (anonymous namespace)::FPS::handleSpecialFP(llvm::MachineInstrBundleIterator<llvm::MachineInstr, false>&) X86FloatingPoint.cpp:0:0
#13 0x000055555c8bd2a6 (anonymous namespace)::FPS::processBasicBlock(llvm::MachineFunction&, llvm::MachineBasicBlock&) (.isra.0) X86FloatingPoint.cpp:0:0
#14 0x000055555c8c0259 (anonymous namespace)::FPS::runOnMachineFunction(llvm::MachineFunction&) X86FloatingPoint.cpp:0:0
#15 0x000055555d708586 llvm::MachineFunctionPass::runOnFunction(llvm::Function&) (/workspace/install/llvm/build_21.1.4/bin/clang-21+0x81b4586)
#16 0x000055555e1026a9 llvm::FPPassManager::runOnFunction(llvm::Function&) (/workspace/install/llvm/build_21.1.4/bin/clang-21+0x8bae6a9)
#17 0x000055555e102e89 llvm::FPPassManager::runOnModule(llvm::Module&) (/workspace/install/llvm/build_21.1.4/bin/clang-21+0x8baee89)
#18 0x000055555e101b77 llvm::legacy::PassManagerImpl::run(llvm::Module&) (/workspace/install/llvm/build_21.1.4/bin/clang-21+0x8badb77)
#19 0x000055555e102469 llvm::legacy::PassManager::run(llvm::Module&) (/workspace/install/llvm/build_21.1.4/bin/clang-21+0x8bae469)
#20 0x000055555f01149e 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*) (/workspace/install/llvm/build_21.1.4/bin/clang-21+0x9abd49e)
#21 0x000055555f9fa3a2 clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) (/workspace/install/llvm/build_21.1.4/bin/clang-21+0xa4a63a2)
#22 0x00005555620c5eb5 clang::ParseAST(clang::Sema&, bool, bool) (/workspace/install/llvm/build_21.1.4/bin/clang-21+0xcb71eb5)
#23 0x000055555fe0d92b clang::ASTFrontendAction::ExecuteAction() (/workspace/install/llvm/build_21.1.4/bin/clang-21+0xa8b992b)
#24 0x000055555f9fb360 clang::CodeGenAction::ExecuteAction() (/workspace/install/llvm/build_21.1.4/bin/clang-21+0xa4a7360)
#25 0x000055555fe159cf clang::FrontendAction::Execute() (/workspace/install/llvm/build_21.1.4/bin/clang-21+0xa8c19cf)
#26 0x000055555fd5bf46 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/workspace/install/llvm/build_21.1.4/bin/clang-21+0xa807f46)
#27 0x000055555ff9df7b clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/workspace/install/llvm/build_21.1.4/bin/clang-21+0xaa49f7b)
#28 0x0000555559d0c523 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/workspace/install/llvm/build_21.1.4/bin/clang-21+0x47b8523)
#29 0x0000555559cfcc58 ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#30 0x0000555559d02b28 clang_main(int, char**, llvm::ToolContext const&) (/workspace/install/llvm/build_21.1.4/bin/clang-21+0x47aeb28)
#31 0x0000555559b5db4a main (/workspace/install/llvm/build_21.1.4/bin/clang-21+0x4609b4a)
#32 0x00007ffff7a201ca __libc_start_call_main ./csu/../sysdeps/nptl/libc_start_call_main.h:74:3
#33 0x00007ffff7a2028b call_init ./csu/../csu/libc-start.c:128:20
#34 0x00007ffff7a2028b __libc_start_main ./csu/../csu/libc-start.c:347:5
#35 0x0000555559cfaf55 _start (/workspace/install/llvm/build_21.1.4/bin/clang-21+0x47a6f55)
clang++: error: unable to execute command: Aborted (core dumped)
clang++: error: clang frontend command failed due to signal (use -v to see invocation)
```
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