llvmbot
commented
4 months ago @llvm/issue-subscribers-backend-aarch64
Author: None (DigOrDog)
# Description
The following code generated by a Fuzzer tool causes crashes in LLVM Compiler (LLC) versions 17.0.1 and 18.1.0. The error message is as follows: "LLVM ERROR: Cannot select: 0x8d60da0: ch = store<(store (s16) into ptr undef), trunc to bf16> 0x8d61350, 0x8d61270, undef:i64, undef:i64."
# Minimal Reproduction
https://godbolt.org/z/K131ef86s
## code
```
; ModuleID = 'Fuzzer input'
source_filename = "M"
@G = global i1 true
@G.1 = global i2 1
@G.2 = global float 0x7FF8000000000000
define i32 @f() {
BB:
%LGV = load i1, ptr @G, align 1
%CastExt = zext i1 %LGV to i2
%RP = alloca i32, align 4
%Castaddrspacecast1 = addrspacecast ptr %RP to ptr addrspace(1)
%L = load i8, ptr addrspace(1) %Castaddrspacecast1, align 1
%0 = load i32, ptr %RP, align 4
store ptr addrspace(1) %Castaddrspacecast1, ptr undef, align 8
store i2 %CastExt, ptr @G.1, align 1
%CastIToFP = uitofp i8 %L to float
store float %CastIToFP, ptr @G.2, align 4
%CastFPTrunc = fptrunc float %CastIToFP to bfloat
store bfloat %CastFPTrunc, ptr undef, align 2
ret i32 %0
}
```
## Stack Trace
```
LLVM ERROR: Cannot select: 0x8d60da0: ch = store<(store (s16) into `ptr undef`), trunc to bf16> 0x8d61350, 0x8d61270, undef:i64, undef:i64
0x8d61270: f32 = uint_to_fp 0x8d61430
0x8d61430: i32,ch = load<(dereferenceable load (s8) from %ir.Castaddrspacecast1, addrspace 1), zext from i8> 0x8d023a0, FrameIndex:i64<0>, undef:i64
0x8d60f60: i64 = FrameIndex<0>
0x8d60e10: i64 = undef
0x8d60e10: i64 = undef
0x8d60e10: i64 = undef
In function: f
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-18.1.0/bin/llc -o /app/output.s -x86-asm-syntax=intel -mtriple aarch64 -global-isel -O0 <source>
1. Running pass 'Function Pass Manager' on module '<source>'.
2. Running pass 'AArch64 Instruction Selection' on function '@f'
#0 0x00000000034ca4a8 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-18.1.0/bin/llc+0x34ca4a8)
#1 0x00000000034c7e1c SignalHandler(int) Signals.cpp:0:0
#2 0x0000752347842520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
#3 0x00007523478969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
#4 0x0000752347842476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
#5 0x00007523478287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
#6 0x0000000000716f82 llvm::RISCVISAInfo::updateCombination() (.cold) RISCVISAInfo.cpp:0:0
#7 0x00000000032a1bc4 llvm::SelectionDAGISel::CannotYetSelect(llvm::SDNode*) (/opt/compiler-explorer/clang-18.1.0/bin/llc+0x32a1bc4)
#8 0x00000000032a7b85 llvm::SelectionDAGISel::SelectCodeCommon(llvm::SDNode*, unsigned char const*, unsigned int) (/opt/compiler-explorer/clang-18.1.0/bin/llc+0x32a7b85)
#9 0x0000000000afc2cd (anonymous namespace)::AArch64DAGToDAGISel::Select(llvm::SDNode*) AArch64ISelDAGToDAG.cpp:0:0
#10 0x000000000329f147 llvm::SelectionDAGISel::DoInstructionSelection() (/opt/compiler-explorer/clang-18.1.0/bin/llc+0x329f147)
#11 0x00000000032ac465 llvm::SelectionDAGISel::CodeGenAndEmitDAG() (/opt/compiler-explorer/clang-18.1.0/bin/llc+0x32ac465)
#12 0x00000000032af12f llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&) (/opt/compiler-explorer/clang-18.1.0/bin/llc+0x32af12f)
#13 0x00000000032b1819 llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&) (.part.0) SelectionDAGISel.cpp:0:0
#14 0x000000000262f530 llvm::MachineFunctionPass::runOnFunction(llvm::Function&) (.part.0) MachineFunctionPass.cpp:0:0
#15 0x0000000002b425d2 llvm::FPPassManager::runOnFunction(llvm::Function&) (/opt/compiler-explorer/clang-18.1.0/bin/llc+0x2b425d2)
#16 0x0000000002b42751 llvm::FPPassManager::runOnModule(llvm::Module&) (/opt/compiler-explorer/clang-18.1.0/bin/llc+0x2b42751)
#17 0x0000000002b443d0 llvm::legacy::PassManagerImpl::run(llvm::Module&) (/opt/compiler-explorer/clang-18.1.0/bin/llc+0x2b443d0)
#18 0x00000000008126b4 compileModule(char**, llvm::LLVMContext&) llc.cpp:0:0
#19 0x0000000000728816 main (/opt/compiler-explorer/clang-18.1.0/bin/llc+0x728816)
#20 0x0000752347829d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#21 0x0000752347829e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#22 0x000000000080a31e _start (/opt/compiler-explorer/clang-18.1.0/bin/llc+0x80a31e)
Program terminated with signal: SIGSEGV
Compiler returned: 139
```
Description
The following code generated by a Fuzzer tool causes crashes in LLVM Compiler (LLC) versions 17.0.1 and 18.1.0. The error message is as follows: "LLVM ERROR: Cannot select: 0x8d60da0: ch = store<(store (s16) into ptr undef), trunc to bf16> 0x8d61350, 0x8d61270, undef:i64, undef:i64."
Minimal Reproduction
https://godbolt.org/z/K131ef86s
code
Stack Trace