| Issue |
61625
|
| Summary |
llvm.fminnum.v16f16 causes: cannot select v16f16 = X86ISD::FMIN
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
nulldatamap
|
After upgrading to LLVM-15, we have run into this issue:
The vectorizer will now generate the intrinsic `llvm.minnum.v16f16` in some cases and this causes the following compiler crash:
```
LVM ERROR: Cannot select: 0x5621390e1aa8: v8f16 = X86ISD::FMIN 0x5621390e1838, 0x5621390e1768
0x5621390e1838: v8f16,ch = CopyFromReg 0x5621390616e8, Register:v8f16 %1
0x5621390e17d0: v8f16 = Register %1
0x5621390e1768: v8f16,ch = CopyFromReg 0x5621390616e8, Register:v8f16 %0
0x5621390e1700: v8f16 = Register %0
In function: test
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-15.0.0/bin/llc -o /app/output.s -x86-asm-syntax=intel -O3 <source>
1. Running pass 'Function Pass Manager' on module '<source>'.
2. Running pass 'X86 DAG->DAG Instruction Selection' on function '@test'
#0 0x00005621350ae594 PrintStackTraceSignalHandler(void*) Signals.cpp:0:0
#1 0x00005621350abdf4 SignalHandler(int) Signals.cpp:0:0
#2 0x00007f16ac5ab420 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x14420)
#3 0x00007f16ac07800b raise (/lib/x86_64-linux-gnu/libc.so.6+0x4300b)
#4 0x00007f16ac057859 abort (/lib/x86_64-linux-gnu/libc.so.6+0x22859)
#5 0x00005621328f3655 llvm::DisplayGraph(llvm::StringRef, bool, llvm::GraphProgram::Name) (.cold) GraphWriter.cpp:0:0
#6 0x0000562134e85480 llvm::SelectionDAGISel::CannotYetSelect(llvm::SDNode*) (/opt/compiler-explorer/clang-15.0.0/bin/llc+0x2e75480)
#7 0x0000562134e8aa1a llvm::SelectionDAGISel::SelectCodeCommon(llvm::SDNode*, unsigned char const*, unsigned int) (/opt/compiler-explorer/clang-15.0.0/bin/llc+0x2e7aa1a)
#8 0x00005621339e45bf (anonymous namespace)::X86DAGToDAGISel::Select(llvm::SDNode*) X86ISelDAGToDAG.cpp:0:0
#9 0x0000562134e83300 llvm::SelectionDAGISel::DoInstructionSelection() (/opt/compiler-explorer/clang-15.0.0/bin/llc+0x2e73300)
#10 0x0000562134e8ede9 llvm::SelectionDAGISel::CodeGenAndEmitDAG() (/opt/compiler-explorer/clang-15.0.0/bin/llc+0x2e7ede9)
#11 0x0000562134e91aa1 llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&) (/opt/compiler-explorer/clang-15.0.0/bin/llc+0x2e81aa1)
#12 0x0000562134e943a8 llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&) (.part.0) SelectionDAGISel.cpp:0:0
#13 0x00005621339ee605 (anonymous namespace)::X86DAGToDAGISel::runOnMachineFunction(llvm::MachineFunction&) X86ISelDAGToDAG.cpp:0:0
#14 0x00005621343a4449 llvm::MachineFunctionPass::runOnFunction(llvm::Function&) (.part.0) MachineFunctionPass.cpp:0:0
#15 0x0000562134834c10 llvm::FPPassManager::runOnFunction(llvm::Function&) (/opt/compiler-explorer/clang-15.0.0/bin/llc+0x2824c10)
#16 0x0000562134834d89 llvm::FPPassManager::runOnModule(llvm::Module&) (/opt/compiler-explorer/clang-15.0.0/bin/llc+0x2824d89)
#17 0x0000562134835970 llvm::legacy::PassManagerImpl::run(llvm::Module&) (/opt/compiler-explorer/clang-15.0.0/bin/llc+0x2825970)
#18 0x00005621329b160b compileModule(char**, llvm::LLVMContext&) llc.cpp:0:0
#19 0x00005621329021c2 main (/opt/compiler-explorer/clang-15.0.0/bin/llc+0x8f21c2)
#20 0x00007f16ac059083 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x24083)
#21 0x00005621329a98fe _start (/opt/compiler-explorer/clang-15.0.0/bin/llc+0x9998fe)
```
Here's a small repro:
```llvm
define <8 x half> @test(<8 x half> %x, <8 x half> %y) {
%1 = call <8 x half> @llvm.minnum.v16f16(<8 x half> %x, <8 x half> %y)
ret <8 x half> %1
}
declare <8 x half> @llvm.minnum.v16f16(<8 x half> %x, <8 x half> %y)
```
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