<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Issue</th>
<td>
<a href=https://github.com/llvm/llvm-project/issues/64277>64277</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>
LLVM ERROR: Error while trying to spill X10 from class GPR: Cannot scavenge register without an emergency spill slot!
</td>
</tr>
<tr>
<th>Labels</th>
<td>
backend:RISC-V,
crash
</td>
</tr>
<tr>
<th>Assignees</th>
<td>
</td>
</tr>
<tr>
<th>Reporter</th>
<td>
chfast
</td>
</tr>
</table>
<pre>
```console
LLVM ERROR: Error while trying to spill X10 from class GPR: Cannot scavenge register without an emergency spill slot!
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace.
Stack dump:
0. Program arguments: bin/llc -mtriple=riscv64 reduced.bc
1. Running pass 'Function Pass Manager' on module 'reduced.bc'.
2. Running pass 'Prologue/Epilogue Insertion & Frame Finalization' on function '@f'
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 0x000055555a1f0f3b __interceptor_backtrace + 91
1 llc 0x0000555563a9b619 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) + 313
2 llc 0x0000555563a936a5 llvm::sys::RunSignalHandlers() + 405
3 llc 0x0000555563a9ce43
4 libc.so.6 0x00007ffff7a39520
5 libc.so.6 0x00007ffff7a8da7c pthread_kill + 300
6 libc.so.6 0x00007ffff7a39476 raise + 22
7 libc.so.6 0x00007ffff7a1f7f3 abort + 211
8 llc 0x0000555563866b9f llvm::report_fatal_error(llvm::Twine const&, bool) + 1023
9 llc 0x00005555613b8437 llvm::RegScavenger::spill(llvm::Register, llvm::TargetRegisterClass const&, int, llvm::MachineInstrBundleIterator<llvm::MachineInstr, false>, llvm::MachineInstrBundleIterator<llvm::MachineInstr, false>&) + 6775
10 llc 0x00005555613ba874 llvm::RegScavenger::scavengeRegisterBackwards(llvm::TargetRegisterClass const&, llvm::MachineInstrBundleIterator<llvm::MachineInstr, false>, bool, int, bool) + 8548
11 llc 0x00005555613bdf98
12 llc 0x00005555613bc935
13 llc 0x00005555613bb682 llvm::scavengeFrameVirtualRegs(llvm::MachineFunction&, llvm::RegScavenger&) + 322
14 llc 0x0000555561183302
15 llc 0x0000555560c55076 llvm::MachineFunctionPass::runOnFunction(llvm::Function&) + 2774
16 llc 0x0000555561fe9ef2 llvm::FPPassManager::runOnFunction(llvm::Function&) + 2562
17 llc 0x00005555620087b3 llvm::FPPassManager::runOnModule(llvm::Module&) + 147
18 llc 0x0000555561fec096 llvm::legacy::PassManagerImpl::run(llvm::Module&) + 6662
19 llc 0x000055555a28b638 main + 35080
```
```llvm
target triple = "riscv64"
define i1 @f(i16 %L11, i1 %L4, ptr %A4, i1 %L5, ptr %G.11, ptr %G.9, i1 %0, i8 %LGV5, ptr %G.1, ptr %G, i64 %B, ptr %G5, ptr %G.2, i1 %C4, ptr %G.5, ptr %G8, i64 %LGV3, ptr %RP, i32 %L7, ptr %G11, ptr %G.12, ptr %G4) {
%C9 = icmp ule i1 %L4, false
%LGV2 = load i64, ptr null, align 4
%A = alloca ptr, i32 0, align 8
%C8 = icmp ult i64 %LGV2, 1
%G41 = getelementptr i64, ptr %A, i16 256
%G6 = getelementptr i16, ptr %G41, i1 true
%B1 = ashr i64 1, %B
%G9 = getelementptr ptr, ptr %G4, i1 %0
store ptr %G5, ptr %G.2, align 8
store i1 %L4, ptr %G.5, align 1
store ptr %G8, ptr null, align 8
%C5 = icmp sgt i64 %B1, %LGV3
store i64 %B, ptr %G6, align 4
store i1 %0, ptr %G.1, align 1
store i64 0, ptr %G9, align 4
store i1 %C4, ptr %A4, align 1
store i1 %C8, ptr null, align 1
store ptr %G11, ptr %RP, align 8
store ptr null, ptr %G.1, align 8
store i1 %L5, ptr null, align 1
store i1 %C5, ptr %G, align 1
store i8 %LGV5, ptr null, align 1
store i1 true, ptr %G.12, align 1
store i1 %C9, ptr %G.9, align 1
store i32 %L7, ptr null, align 4
store i16 %L11, ptr %G.11, align 2
ret i1 %0
}
```
https://godbolt.org/z/qbvvvcTfo
</pre>
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