xps::learn_zig => cat asm.zig

const std = @import("std");

pub fn main() void {
    const foo: i64 = undefined;

    asm volatile (
        \\ mov $12, %[foo]
        :
        : [foo] "=m" (foo)
    );

    std.debug.warn("{}\n", foo);
}


(gdb) bt
#0  0x00007ffff54c342c in llvm::SelectionDAGBuilder::visitInlineAsm(llvm::ImmutableCallSite) ()                                                                                       
#1  0x00007ffff54d4b51 in llvm::SelectionDAGBuilder::visitCall(llvm::CallInst const&) ()
#2  0x00007ffff54dc1f9 in llvm::SelectionDAGBuilder::visit(llvm::Instruction const&) ()
#3  0x00007ffff551ede2 in llvm::SelectionDAGISel::SelectBasicBlock(llvm::ilist_iterator<llvm::ilist_detail::node_options<llvm::Instruction, false, false, void>, false, true>, llvm::ilist_iterator<llvm::ilist_detail::node_options<llvm::Instruction, false, false, void>, false, true>, bool&) ()                                                                         
#4  0x00007ffff5525703 in llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&) ()                                                                                      
#5  0x00007ffff5526a0e in llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&) ()                                                                                     
#6  0x00007ffff45cf3c0 in (anonymous namespace)::X86DAGToDAGISel::runOnMachineFunction(llvm::MachineFunction&) ()                                                                     
#7  0x00007ffff5822ee5 in llvm::MachineFunctionPass::runOnFunction(llvm::Function&) [clone .part.43] ()                                                                               
#8  0x00007ffff6411029 in llvm::FPPassManager::runOnFunction(llvm::Function&) ()
#9  0x00007ffff6411081 in llvm::FPPassManager::runOnModule(llvm::Module&) ()
#10 0x00007ffff64103a2 in llvm::legacy::PassManagerImpl::run(llvm::Module&) ()
#11 0x00007ffff26cd787 in ZigLLVMTargetMachineEmitToFile ()
#12 0x00007ffff25ff98c in codegen_build_and_link(CodeGen*) ()
#13 0x00007ffff251c415 in main ()


xps::learn_zig => lli asm.ll                                                                                      
lli: asm.ll:30372:13: error: invalid type for inline asm constraint string                                                                                                             
  call void asm sideeffect " mov $$12, $0", "=m"(i64 undef), !dbg !13268                                                                                                               
            ^