[Clang] ICE in EmitAsmStmt when inline assembly uses an invalid constraint #171795
Description
Link for quick verification: https://godbolt.org/z/Gzj4fPj4z
#include <immintrin.h>
__attribute__((__vector_size__(8))) int a, b;
int main() {
__attribute__((__vector_size__(8))) int result = a * b;
int reg_val;
__asm__("mov %1, %0" : "=r"(reg_val) : "k"(result));
return 0;
}When I used the invalid k constraint in inline assembly, the compiler went crash. The crash happened on clang (assertions trunk).
Stack dump:
clang-21: /workspace/install/llvm/src/llvm-project/llvm/lib/IR/Instructions.cpp:3037: static llvm::CastInst* llvm::CastInst::Create(llvm::Instruction::CastOps, llvm::Value*, llvm::Type*, const llvm::Twine&, llvm::InsertPosition): Assertion `castIsValid(op, S, Ty) && "Invalid cast!"' 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 33603.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/generate_feature_fine_tuning_qwen_4b_choose_2_4_exp -fcoverage-compilation-dir=/workspace/exps/featurefuzz/generate_feature_fine_tuning_qwen_4b_choose_2_4_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=141 -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/33603-e18a61.o -x c++ /workspace/exps/featurefuzz/generate_feature_fine_tuning_qwen_4b_choose_2_4_exp/bugs/33603.fuzz
1. <eof> parser at end of file
2. /workspace/exps/featurefuzz/generate_feature_fine_tuning_qwen_4b_choose_2_4_exp/bugs/33603.fuzz:6:5: LLVM IR generation of declaration 'main'
3. /workspace/exps/featurefuzz/generate_feature_fine_tuning_qwen_4b_choose_2_4_exp/bugs/33603.fuzz:6:5: Generating code for declaration 'main'
#0 0x00006034c9506c2a llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/workspace/install/llvm/build_21.1.4/bin/clang-21+0x9691c2a)
#1 0x00006034c9507457 PrintStackTraceSignalHandler(void*) Signals.cpp:0:0
#2 0x00006034c9500f57 llvm::sys::RunSignalHandlers() (/workspace/install/llvm/build_21.1.4/bin/clang-21+0x968bf57)
#3 0x00006034c95011c7 SignalHandler(int, siginfo_t*, void*) Signals.cpp:0:0
#4 0x00007df171c94330 (/lib/x86_64-linux-gnu/libc.so.6+0x45330)
#5 0x00007df171cedb2c __pthread_kill_implementation ./nptl/pthread_kill.c:44:76
#6 0x00007df171cedb2c __pthread_kill_internal ./nptl/pthread_kill.c:78:10
#7 0x00007df171cedb2c pthread_kill ./nptl/pthread_kill.c:89:10
#8 0x00007df171c9427e raise ./signal/../sysdeps/posix/raise.c:27:6
#9 0x00007df171c778ff abort ./stdlib/abort.c:81:7
#10 0x00007df171c7781b _nl_load_domain ./intl/loadmsgcat.c:1177:9
#11 0x00007df171c8a517 (/lib/x86_64-linux-gnu/libc.so.6+0x3b517)
#12 0x00006034c89dd8dd (/workspace/install/llvm/build_21.1.4/bin/clang-21+0x8b688dd)
#13 0x00006034c9c7a752 llvm::IRBuilderBase::CreateCast(llvm::Instruction::CastOps, llvm::Value*, llvm::Type*, llvm::Twine const&, llvm::MDNode*, llvm::FMFSource) (.isra.0) CGStmt.cpp:0:0
#14 0x00006034c9c8ccb1 clang::CodeGen::CodeGenFunction::EmitAsmStmt(clang::AsmStmt const&) (/workspace/install/llvm/build_21.1.4/bin/clang-21+0x9e17cb1)
#15 0x00006034c9c935a7 clang::CodeGen::CodeGenFunction::EmitStmt(clang::Stmt const*, llvm::ArrayRef<clang::Attr const*>) (/workspace/install/llvm/build_21.1.4/bin/clang-21+0x9e1e5a7)
#16 0x00006034c9c9c01d clang::CodeGen::CodeGenFunction::EmitCompoundStmtWithoutScope(clang::CompoundStmt const&, bool, clang::CodeGen::AggValueSlot) (/workspace/install/llvm/build_21.1.4/bin/clang-21+0x9e2701d)
#17 0x00006034c9d360ff clang::CodeGen::CodeGenFunction::EmitFunctionBody(clang::Stmt const*) (/workspace/install/llvm/build_21.1.4/bin/clang-21+0x9ec10ff)
#18 0x00006034c9d563f9 clang::CodeGen::CodeGenFunction::GenerateCode(clang::GlobalDecl, llvm::Function*, clang::CodeGen::CGFunctionInfo const&) (/workspace/install/llvm/build_21.1.4/bin/clang-21+0x9ee13f9)
#19 0x00006034c9dfd5e5 clang::CodeGen::CodeGenModule::EmitGlobalFunctionDefinition(clang::GlobalDecl, llvm::GlobalValue*) (/workspace/install/llvm/build_21.1.4/bin/clang-21+0x9f885e5)
#20 0x00006034c9e0307d clang::CodeGen::CodeGenModule::EmitGlobalDefinition(clang::GlobalDecl, llvm::GlobalValue*) (/workspace/install/llvm/build_21.1.4/bin/clang-21+0x9f8e07d)
#21 0x00006034c9e08278 clang::CodeGen::CodeGenModule::EmitGlobal(clang::GlobalDecl) (/workspace/install/llvm/build_21.1.4/bin/clang-21+0x9f93278)
#22 0x00006034c9e0936a clang::CodeGen::CodeGenModule::EmitTopLevelDecl(clang::Decl*) (/workspace/install/llvm/build_21.1.4/bin/clang-21+0x9f9436a)
#23 0x00006034ca322be0 (anonymous namespace)::CodeGeneratorImpl::HandleTopLevelDecl(clang::DeclGroupRef) ModuleBuilder.cpp:0:0
#24 0x00006034ca30c475 clang::BackendConsumer::HandleTopLevelDecl(clang::DeclGroupRef) (/workspace/install/llvm/build_21.1.4/bin/clang-21+0xa497475)
#25 0x00006034cc9e69b2 clang::ParseAST(clang::Sema&, bool, bool) (/workspace/install/llvm/build_21.1.4/bin/clang-21+0xcb719b2)
#26 0x00006034ca72e92b clang::ASTFrontendAction::ExecuteAction() (/workspace/install/llvm/build_21.1.4/bin/clang-21+0xa8b992b)
#27 0x00006034ca31c360 clang::CodeGenAction::ExecuteAction() (/workspace/install/llvm/build_21.1.4/bin/clang-21+0xa4a7360)
#28 0x00006034ca7369cf clang::FrontendAction::Execute() (/workspace/install/llvm/build_21.1.4/bin/clang-21+0xa8c19cf)
#29 0x00006034ca67cf46 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/workspace/install/llvm/build_21.1.4/bin/clang-21+0xa807f46)
#30 0x00006034ca8bef7b clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/workspace/install/llvm/build_21.1.4/bin/clang-21+0xaa49f7b)
#31 0x00006034c462d523 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/workspace/install/llvm/build_21.1.4/bin/clang-21+0x47b8523)
#32 0x00006034c461dc58 ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#33 0x00006034c4623b28 clang_main(int, char**, llvm::ToolContext const&) (/workspace/install/llvm/build_21.1.4/bin/clang-21+0x47aeb28)
#34 0x00006034c447eb4a main (/workspace/install/llvm/build_21.1.4/bin/clang-21+0x4609b4a)
#35 0x00007df171c791ca __libc_start_call_main ./csu/../sysdeps/nptl/libc_start_call_main.h:74:3
#36 0x00007df171c7928b call_init ./csu/../csu/libc-start.c:128:20
#37 0x00007df171c7928b __libc_start_main ./csu/../csu/libc-start.c:347:5
#38 0x00006034c461bf55 _start (/workspace/install/llvm/build_21.1.4/bin/clang-21+0x47a6f55)
clang++: error: unable to execute command: Aborted (core dumped)