Closed
Description
According to the Intel Software Developer's Manual, GFNI instructions on 512-bit vectors only require GFNI + AVX512F. Without AVX512BW, however, LLVM errors:
declare <64 x i8> @llvm.x86.vgf2p8mulb.512(<64 x i8>, <64 x i8>)
define <64 x i8> @foo(<64 x i8>, <64 x i8>) local_unnamed_addr #0 {
%3 = call <64 x i8> @llvm.x86.vgf2p8mulb.512(<64 x i8> %0, <64 x i8> %1)
ret <64 x i8> %3
}
attributes #0 = { "target-features"="+gfni,+avx512f" }LLVM ERROR: Cannot select: 0x55a198567b00: v64i8 = X86ISD::GF2P8MULB 0x55a198567710, 0x55a1985677f0
0x55a198567710: v64i8,ch = CopyFromReg 0x55a1984e5698, Register:v64i8 %0
0x55a1985676a0: v64i8 = Register %0
0x55a1985677f0: v64i8,ch = CopyFromReg 0x55a1984e5698, Register:v64i8 %1
0x55a198567780: v64i8 = Register %1
In function: foo
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 '@foo'
#0 0x000055a192e12034 PrintStackTraceSignalHandler(void*) Signals.cpp:0:0
#1 0x000055a192e0f8b4 SignalHandler(int) Signals.cpp:0:0
#2 0x00007f418b895420 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x14420)
#3 0x00007f418b36200b raise (/lib/x86_64-linux-gnu/libc.so.6+0x4300b)
#4 0x00007f418b341859 abort (/lib/x86_64-linux-gnu/libc.so.6+0x22859)
#5 0x000055a1904ccd9d llvm::DisplayGraph(llvm::StringRef, bool, llvm::GraphProgram::Name) (.cold) GraphWriter.cpp:0:0
#6 0x000055a192be1130 llvm::SelectionDAGISel::CannotYetSelect(llvm::SDNode*) (/opt/compiler-explorer/clang-trunk/bin/llc+0x3019130)
#7 0x000055a192be70a2 llvm::SelectionDAGISel::SelectCodeCommon(llvm::SDNode*, unsigned char const*, unsigned int) (/opt/compiler-explorer/clang-trunk/bin/llc+0x301f0a2)
#8 0x000055a1916ef042 (anonymous namespace)::X86DAGToDAGISel::Select(llvm::SDNode*) X86ISelDAGToDAG.cpp:0:0
#9 0x000055a192bdefc7 llvm::SelectionDAGISel::DoInstructionSelection() (/opt/compiler-explorer/clang-trunk/bin/llc+0x3016fc7)
#10 0x000055a192beb479 llvm::SelectionDAGISel::CodeGenAndEmitDAG() (/opt/compiler-explorer/clang-trunk/bin/llc+0x3023479)
#11 0x000055a192bee141 llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&) (/opt/compiler-explorer/clang-trunk/bin/llc+0x3026141)
#12 0x000055a192bf0a9f llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&) (.part.0) SelectionDAGISel.cpp:0:0
#13 0x000055a1916f90c5 (anonymous namespace)::X86DAGToDAGISel::runOnMachineFunction(llvm::MachineFunction&) X86ISelDAGToDAG.cpp:0:0
#14 0x000055a1920d75c0 llvm::MachineFunctionPass::runOnFunction(llvm::Function&) (.part.0) MachineFunctionPass.cpp:0:0
#15 0x000055a19257e6b0 llvm::FPPassManager::runOnFunction(llvm::Function&) (/opt/compiler-explorer/clang-trunk/bin/llc+0x29b66b0)
#16 0x000055a19257e829 llvm::FPPassManager::runOnModule(llvm::Module&) (/opt/compiler-explorer/clang-trunk/bin/llc+0x29b6829)
#17 0x000055a19257f410 llvm::legacy::PassManagerImpl::run(llvm::Module&) (/opt/compiler-explorer/clang-trunk/bin/llc+0x29b7410)
#18 0x000055a1905a1d0b compileModule(char**, llvm::LLVMContext&) llc.cpp:0:0
#19 0x000055a1904db832 main (/opt/compiler-explorer/clang-trunk/bin/llc+0x913832)
#20 0x00007f418b343083 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x24083)
#21 0x000055a190599c2e _start (/opt/compiler-explorer/clang-trunk/bin/llc+0x9d1c2e)
Compiler returned: 139I didn't check all instructions, but VPCLMULQDQ and VAES have similar CPUID tiers and may have similar issues.