<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Issue</th>
<td>
<a href=https://github.com/llvm/llvm-project/issues/63357>63357</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>
LLVM ERROR: Error while trying to spill V0_64 from class GPR64: Cannot scavenge register without an emergency spill slot!
</td>
</tr>
<tr>
<th>Labels</th>
<td>
backend:MIPS,
llvm:crash
</td>
</tr>
<tr>
<th>Assignees</th>
<td>
</td>
</tr>
<tr>
<th>Reporter</th>
<td>
chfast
</td>
</tr>
</table>
<pre>
```
LLVM ERROR: Error while trying to spill V0_64 from class GPR64: 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: /opt/compiler-explorer/clang-assertions-trunk/bin/llc -o /app/output.s -x86-asm-syntax=intel <source>
1. Running pass 'Function Pass Manager' on module '<source>'.
2. Running pass 'Prologue/Epilogue Insertion & Frame Finalization' on function '@f'
#0 0x0000558b0b2e6e0f llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/llc+0x3575e0f)
#1 0x0000558b0b2e4564 SignalHandler(int) Signals.cpp:0:0
#2 0x00007f510049e420 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x14420)
#3 0x00007f50fff6b00b raise (/lib/x86_64-linux-gnu/libc.so.6+0x4300b)
#4 0x00007f50fff4a859 abort (/lib/x86_64-linux-gnu/libc.so.6+0x22859)
#5 0x0000558b0853cbac llvm::SuffixTree::insertLeaf(llvm::SuffixTreeInternalNode&, unsigned int, unsigned int) (.cold) SuffixTree.cpp:0:0
#6 0x0000558b0a77f585 llvm::RegScavenger::spill(llvm::Register, llvm::TargetRegisterClass const&, int, llvm::MachineInstrBundleIterator<llvm::MachineInstr, false>, llvm::MachineInstrBundleIterator<llvm::MachineInstr, false>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/llc+0x2a0e585)
#7 0x0000558b0a77fe39 llvm::RegScavenger::scavengeRegisterBackwards(llvm::TargetRegisterClass const&, llvm::MachineInstrBundleIterator<llvm::MachineInstr, false>, bool, int, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/llc+0x2a0ee39)
#8 0x0000558b0a780ea1 scavengeFrameVirtualRegsInBlock(llvm::MachineRegisterInfo&, llvm::RegScavenger&, llvm::MachineBasicBlock&) RegisterScavenging.cpp:0:0
#9 0x0000558b0a7812db llvm::scavengeFrameVirtualRegs(llvm::MachineFunction&, llvm::RegScavenger&) (/opt/compiler-explorer/clang-assertions-trunk/bin/llc+0x2a102db)
#10 0x0000558b0a6e5c58 (anonymous namespace)::PEI::runOnMachineFunction(llvm::MachineFunction&) PrologEpilogInserter.cpp:0:0
#11 0x0000558b0a576dae llvm::MachineFunctionPass::runOnFunction(llvm::Function&) (.part.0) MachineFunctionPass.cpp:0:0
#12 0x0000558b0ab0d081 llvm::FPPassManager::runOnFunction(llvm::Function&) (/opt/compiler-explorer/clang-assertions-trunk/bin/llc+0x2d9c081)
#13 0x0000558b0ab0d2c9 llvm::FPPassManager::runOnModule(llvm::Module&) (/opt/compiler-explorer/clang-assertions-trunk/bin/llc+0x2d9c2c9)
#14 0x0000558b0ab0db42 llvm::legacy::PassManagerImpl::run(llvm::Module&) (/opt/compiler-explorer/clang-assertions-trunk/bin/llc+0x2d9cb42)
#15 0x0000558b085f9ca4 compileModule(char**, llvm::LLVMContext&) llc.cpp:0:0
#16 0x0000558b08541fa6 main (/opt/compiler-explorer/clang-assertions-trunk/bin/llc+0x7d0fa6)
#17 0x00007f50fff4c083 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x24083)
#18 0x0000558b085eff9e _start (/opt/compiler-explorer/clang-assertions-trunk/bin/llc+0x87ef9e)
Compiler returned: 139
```
```llvm
target triple = "mips64-unknown-linux-gnu"
@G = external global double
@G.1 = external global i1
@G.2 = external global i1
@G.3 = external global i1
@G.4 = external global i1
@G.5 = external global i1
@G.6 = external global i16
@G.7 = external global float
@G.8 = external global i32
@G.9 = external global i32
@G.10 = external global ptr
@G.11 = external global i1
@G.12 = external global i16
@G.13 = external global i16
@G.14 = external global i8
@G.15 = external global i1
@G.16 = external global i1
@G.17 = external global float
@G.18 = external global i8
define void @f() {
BB:
%A26 = alloca i1, align 1
%L2 = load i64, ptr poison, align 4
%LGV3 = load i32, ptr @G.9, align 4
%L1 = load i32, ptr poison, align 4
%L = load float, ptr poison, align 4
%B12 = mul i32 %L1, %LGV3
%C41 = icmp ne i64 %L2, 0
%C21 = fcmp ult float %L, 0.000000e+00
%LGV = load i1, ptr @G.4, align 1
%C2 = icmp ne i32 42, %B12
%C3 = icmp slt i1 %C21, %C41
%C = icmp ugt i1 %C2, %C3
%C1 = icmp sle i1 %C2, %C
%C5 = icmp uge i1 %LGV, %C
br label %BB3
BB3: ; preds = %BB7, %BB
%C28 = icmp slt i1 %C1, %C21
%C18 = icmp uge i1 %C2, %C28
store i1 false, ptr @G.16, align 1
br label %BB5
BB5: ; preds = %BB5, %BB3
%C44 = icmp ult i32 42, %B12
store i1 %C44, ptr poison, align 1
%B24 = lshr i16 -32768, poison
%C10 = icmp ugt i1 %C3, %C
%B19 = add i1 %C10, %C18
%C14 = icmp uge i1 %C10, poison
store i1 false, ptr @G.3, align 1
store i16 %B24, ptr @G.13, align 2
br i1 %C10, label %BB5, label %BB7
BB7: ; preds = %BB5
%C24 = icmp sgt i1 %C18, %C14
%C39 = icmp sle i1 %C24, %C24
%B21 = or i1 %C24, %B19
%C42 = icmp uge i1 %C5, true
%G10 = getelementptr i8, ptr %A26, i16 32767
store i1 %C24, ptr @G.4, align 1
store i1 %B19, ptr %G10, align 1
store i1 %B21, ptr poison, align 1
store i1 %C39, ptr %A26, align 1
store i1 %C42, ptr undef, align 1
br i1 %C3, label %BB3, label %BB4
BB4: ; preds = %BB4, %BB7
br label %BB4
}
```
https://godbolt.org/z/nvv6GP8Td
</pre>
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