clang (and LLVM) cannot handle the following ARM assembler.

int to_int32(double d)
{
  int i;
  __asm(
    "mov %0, %Q1\n"
    "add %0, %R1\n"
    : "=r"(i), "=&r"(d)
    : "1"(d)
    :);
  return i;
}

"Q" and "R" is assigned to high dword and low dword of double, but LLVM cannot handle this.


clang: /home/makoto/Development/llvm.org/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp:387: void getCopyToParts(llvm::SelectionDAG &, llvm::SDLoc, llvm::SDValue, llvm::SDValue *, unsigned int, llvm::MVT, const llvm::Value *, ISD::NodeType): Assertion `(PartVT.isInteger() || PartVT == MVT::x86mmx) && ValueVT.isInteger() && "Unknown mismatch!"' failed.
0  clang           0x00000000034ee98e llvm::sys::PrintStackTrace(_IO_FILE*) + 46
1  clang           0x00000000034eec4b
2  clang           0x00000000034eeebe
3  libpthread.so.0 0x00007f0d55565bb0
4  libc.so.6       0x00007f0d54579f77 gsignal + 55
5  libc.so.6       0x00007f0d5457d5e8 abort + 328
6  libc.so.6       0x00007f0d54572d43
7  libc.so.6       0x00007f0d54572df2
8  clang           0x0000000002a8f3f9
9  clang           0x0000000002ab7988
10 clang           0x0000000002a96aea llvm::SelectionDAGBuilder::visitInlineAsm(llvm::ImmutableCallSite) + 7322
11 clang           0x0000000002a87941 llvm::SelectionDAGBuilder::visitCall(llvm::CallInst const&) + 97
12 clang           0x0000000002a80399 llvm::SelectionDAGBuilder::visit(unsigned int, llvm::User const&) + 1097
13 clang           0x0000000002a7f8b3 llvm::SelectionDAGBuilder::visit(llvm::Instruction const&) + 131
14 clang           0x0000000002add51c llvm::SelectionDAGISel::SelectBasicBlock(llvm::ilist_iterator<llvm::Instruction const>, llvm::ilist_iterator<llvm::Instruction const>, bool&) + 140
15 clang           0x0000000002add035 llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&) + 2469
16 clang           0x0000000002adb787 llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&) + 935
17 clang           0x0000000002d01ade llvm::MachineFunctionPass::runOnFunction(llvm::Function&) + 110
18 clang           0x0000000003459b5b llvm::FPPassManager::runOnFunction(llvm::Function&) + 427
19 clang           0x0000000003459e68 llvm::FPPassManager::runOnModule(llvm::Module&) + 104
20 clang           0x000000000345a26a llvm::MPPassManager::runOnModule(llvm::Module&) + 634
21 clang           0x000000000345aa1e llvm::PassManagerImpl::run(llvm::Module&) + 302
22 clang           0x000000000345ac71 llvm::PassManager::run(llvm::Module&) + 33
23 clang           0x0000000000b6db59
24 clang           0x0000000000b6d688 clang::EmitBackendOutput(clang::DiagnosticsEngine&, clang::CodeGenOptions const&, clang::TargetOptions const&, clang::LangOptions const&, llvm::Module*, clang::BackendAction, llvm::raw_ostream*) + 104
25 clang           0x0000000000b6a6f9
26 clang           0x0000000000dcb9cd clang::ParseAST(clang::Sema&, bool, bool) + 813
27 clang           0x00000000008a1229 clang::ASTFrontendAction::ExecuteAction() + 345
28 clang           0x0000000000b69a3e clang::CodeGenAction::ExecuteAction() + 1246
29 clang           0x00000000008a0d4f clang::FrontendAction::Execute() + 191
30 clang           0x000000000086bc20 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) + 800
31 clang           0x000000000082db68 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) + 1048
32 clang           0x000000000081b73a cc1_main(char const**, char const**, char const*, void*) + 698
33 clang           0x0000000000827b42 main + 802
34 libc.so.6       0x00007f0d54564de5 __libc_start_main + 245
35 clang           0x000000000081b3b9
Stack dump:
0.      Program arguments: /home/makoto/Development/llvm.org/build/Debug+Asserts/bin/clang -cc1 -triple armv7-none-linux-androideabi -S -disable-free -main-file-name asm.c -mrelocation-model static -mdisable-fp-elim -fmath-errno -mconstructor-aliases -fuse-init-array -target-cpu cortex-a8 -target-feature +soft-float-abi -target-abi aapcs-linux -mfloat-abi soft -target-linker-version 2.23.52.201309
13 -coverage-file /tmp/asm-6f9de6.s -resource-dir /home/makoto/Development/llvm.org/build/Debug+Asserts/bin/../lib/clang/3.4 -internal-isystem /usr/local/include -internal-isystem /home/makoto/Development/llvm.org/build/Debug+Asserts/bin/../lib/clang/3.4/include -internal-externc-isystem /include -internal-externc-isystem /usr/include -fno-dwarf-directory-asm -fdebug-compilation-dir /home/makoto/Development/llvm.org/build -ferror-limit 19 -fmessage-length 80 -mstackrealign -fno-signed-char -fobjc-runtime=gcc -fdiagnostics-show-option -fcolor-diagnostics-vectorize-slp -o /tmp/asm-6f9de6.s -x c asm.c
1.      <eof> parser at end of file
2.      Code generation
3.      Running pass 'Function Pass Manager' on module 'asm.c'.
4.      Running pass 'ARM Instruction Selection' on function '@to_int32'
clang: error: unable to execute command: Aborted (core dumped)
clang: error: clang frontend command failed due to signal (use -v to see invocat
ion)
clang version 3.4 (trunk 193915)
Target: armv7-none-linux-androideabi
Thread model: posix
clang: note: diagnostic msg: PLEASE submit a bug report to http://llvm.org/bugs/
 and include the crash backtrace, preprocessed source, and associated run script
.
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/asm-e4fbd1.c
clang: note: diagnostic msg: /tmp/asm-e4fbd1.sh
clang: note: diagnostic msg: