| Issue |
139381
|
| Summary |
[x86]: Cannot select: `constant:i128<0>` for `llvm.maximum.f128`
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
Urgau
|
I'm seeing an error when trying to use llvm.minimum.f128 and llvm.maximum.f128 on x86.
```
; Function Attrs: mustprogress nofree nosync nounwind nonlazybind readnone uwtable willreturn
define fp128 @call_maximum_fp128_x86(fp128 %x, fp128 %y) unnamed_addr #0 {
start:
%0 = tail call fp128 @llvm.maximum.f128(fp128 %x, fp128 %y) #2
ret fp128 %0
}
; Function Attrs: mustprogress nofree nosync nounwind readnone speculatable willreturn
declare fp128 @llvm.maximum.f128(fp128, fp128)
```
```
LLVM ERROR: Cannot select: 0x3ade0080: i8 = setcc 0x3addc768, Constant:i128<0>, seteq:ch
0x3addc768: i128 = bitcast 0x3addbe08
0x3addbe08: f128,ch = CopyFromReg 0x3ad783c0, Register:f128 %1
0x3addbd90: f128 = Register %1
0x3addfdb0: i128 = Constant<0>
In function: call_maximum_fp128_x86
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-trunk/bin/llc -o /app/output.s -x86-asm-syntax=intel <source>
1. Running pass 'Function Pass Manager' on module '<source>'.
2. Running pass 'X86 DAG->DAG Instruction Selection' on function '@call_maximum_fp128_x86'
#0 0x0000000003b49548 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-trunk/bin/llc+0x3b49548)
#1 0x0000000003b47104 SignalHandler(int, siginfo_t*, void*) Signals.cpp:0:0
#2 0x00007e645a842520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
#3 0x00007e645a8969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
#4 0x00007e645a842476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
#5 0x00007e645a8287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
#6 0x0000000000784592 llvm::UniqueStringSaver::save(llvm::Twine const&) (.cold) StringSaver.cpp:0:0
#7 0x00000000038f0888 llvm::SelectionDAGISel::CannotYetSelect(llvm::SDNode*) (/opt/compiler-explorer/clang-trunk/bin/llc+0x38f0888)
#8 0x00000000038f6bf9 llvm::SelectionDAGISel::SelectCodeCommon(llvm::SDNode*, unsigned char const*, unsigned int) (/opt/compiler-explorer/clang-trunk/bin/llc+0x38f6bf9)
#9 0x0000000001f70c6a (anonymous namespace)::X86DAGToDAGISel::Select(llvm::SDNode*) X86ISelDAGToDAG.cpp:0:0
#10 0x00000000038edd74 llvm::SelectionDAGISel::DoInstructionSelection() (/opt/compiler-explorer/clang-trunk/bin/llc+0x38edd74)
#11 0x00000000038fc882 llvm::SelectionDAGISel::CodeGenAndEmitDAG() (/opt/compiler-explorer/clang-trunk/bin/llc+0x38fc882)
#12 0x00000000038ff1fa llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&) (/opt/compiler-explorer/clang-trunk/bin/llc+0x38ff1fa)
#13 0x00000000039010d6 llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&) (/opt/compiler-explorer/clang-trunk/bin/llc+0x39010d6)
#14 0x00000000038ed8f1 llvm::SelectionDAGISelLegacy::runOnMachineFunction(llvm::MachineFunction&) (/opt/compiler-explorer/clang-trunk/bin/llc+0x38ed8f1)
#15 0x0000000002bb4a78 llvm::MachineFunctionPass::runOnFunction(llvm::Function&) (.part.0) MachineFunctionPass.cpp:0:0
#16 0x0000000003135322 llvm::FPPassManager::runOnFunction(llvm::Function&) (/opt/compiler-explorer/clang-trunk/bin/llc+0x3135322)
#17 0x00000000031355b1 llvm::FPPassManager::runOnModule(llvm::Module&) (/opt/compiler-explorer/clang-trunk/bin/llc+0x31355b1)
#18 0x0000000003136f19 llvm::legacy::PassManagerImpl::run(llvm::Module&) (/opt/compiler-explorer/clang-trunk/bin/llc+0x3136f19)
#19 0x00000000008bec3f compileModule(char**, llvm::LLVMContext&) llc.cpp:0:0
#20 0x000000000079977e main (/opt/compiler-explorer/clang-trunk/bin/llc+0x79977e)
#21 0x00007e645a829d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#22 0x00007e645a829e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#23 0x00000000008b6705 _start (/opt/compiler-explorer/clang-trunk/bin/llc+0x8b6705)
Program terminated with signal: SIGSEGV
Compiler returned: 139
```
https://godbolt.org/z/z3arKMfjo
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