crash: Assertion failed: (MI->getNumOperands() > OpNo + 1 && "Expected additional operand"), function bool, file RISCVAsmPrinter.cpp

Snippet:

define i32 @constraint_m_2() {
  %1 = tail call i32 asm "lw $0, $1", "=r,*m"(ptr elementtype(i32) null)
  ret i32 %1
}

Compiler Explorer panes:

Reproduce:

llc -mtriple=riscv32 -code-model=medium -verify-machineinstrs -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.* snippet.ll -o -
llc -mtriple=riscv32 -code-model=medium -verify-machineinstrs -global-isel=0 snippet.ll -o -

Local llc output:

llc: /home/runner/work/llvm-fuzz/llvm-fuzz/llvm-project/llvm/lib/Target/RISCV/RISCVAsmPrinter.cpp:512: virtual bool (anonymous namespace)::RISCVAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *, unsigned int, const char *, raw_ostream &): Assertion `MI->getNumOperands() > OpNo + 1 && "Expected additional operand"' failed.
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace and instructions to reproduce the bug.
Stack dump:
0.	Program arguments: /home/runner/work/llvm-fuzz/llvm-fuzz/llvm-project/build/bin/llc -mtriple=riscv32 -code-model=medium -verify-machineinstrs -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.* -o -
1.	Running pass 'Function Pass Manager' on module '<stdin>'.
2.	Running pass 'RISC-V Assembly Printer' on function '@constraint_m_2'
Stack dump without symbol names (ensure you have llvm-symbolizer in your PATH or set the environment var `LLVM_SYMBOLIZER_PATH` to point to it):
0  llc       0x00005599edb4779b llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) + 43
1  llc       0x00005599edb44641 llvm::sys::RunSignalHandlers() + 369
2  llc       0x00005599edb4821b
3  libc.so.6 0x00007efc48a45330
4  libc.so.6 0x00007efc48a9ec0c pthread_kill + 284
5  libc.so.6 0x00007efc48a4527e gsignal + 30
6  libc.so.6 0x00007efc48a288ff abort + 223
7  libc.so.6 0x00007efc48a2881b
8  libc.so.6 0x00007efc48a3b517
9  llc       0x00005599eedfa952
10 llc       0x00005599eeecb191 llvm::AsmPrinter::emitInlineAsm(llvm::MachineInstr const*) + 2193
11 llc       0x00005599eee08087 llvm::AsmPrinter::emitFunctionBody() + 4535
12 llc       0x00005599eedf4c17
13 llc       0x00005599ee10ed2d llvm::MachineFunctionPass::runOnFunction(llvm::Function&) + 653
14 llc       0x00005599ede9ecd7 llvm::FPPassManager::runOnFunction(llvm::Function&) + 871
15 llc       0x00005599edea71d2 llvm::FPPassManager::runOnModule(llvm::Module&) + 50
16 llc       0x00005599ede9fa80 llvm::legacy::PassManagerImpl::run(llvm::Module&) + 2000
17 llc       0x00005599edb4edf8 llcMain + 12056
18 llc       0x00005599eda8a62f main + 63
19 libc.so.6 0x00007efc48a2a1ca
20 libc.so.6 0x00007efc48a2a28b __libc_start_main + 139
21 llc       0x00005599eda8a525 _start + 37

Occurrences (50):

Generated 2026-10-15 08:05 UTC.