| Issue |
83929
|
| Summary |
[RISC-V] Segfault during pass 'RISC-V DAG->DAG Pattern Instruction Selection'
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
patrick-rivos
|
Testcase:
```
int a, b;
_Bool c[2];
_Bool f;
int main() {
for (long d = 0; d < 1; d += b)
for (_Bool e = d; e < f; e = 1)
a = 5 ? c[e] : 0;
}
```
LLVM IR:
```llvm ir
; ModuleID = 'bugpoint-reduced-simplified.bc'
source_filename = "reduced.ll"
target datalayout = "e-m:e-p:64:64-i64:64-i128:128-n32:64-S128"
target triple = "riscv64-unknown-linux-gnu"
define void @main(<vscale x 4 x i1> %0) #0 {
entry:
%1 = zext <vscale x 4 x i1> %0 to <vscale x 4 x i64>
%2 = getelementptr [2 x i8], ptr null, i64 0, <vscale x 4 x i64> %1
%wide.masked.gather = tail call <vscale x 4 x i8> @llvm.masked.gather.nxv4i8.nxv4p0(<vscale x 4 x ptr> %2, i32 0, <vscale x 4 x i1> %0, <vscale x 4 x i8> zeroinitializer)
tail call void @llvm.masked.scatter.nxv4i32.nxv4p0(<vscale x 4 x i32> zeroinitializer, <vscale x 4 x ptr> zeroinitializer, i32 0, <vscale x 4 x i1> zeroinitializer)
ret void
}
; Function Attrs: nocallback nofree nosync nounwind willreturn memory(read)
declare <vscale x 4 x i8> @llvm.masked.gather.nxv4i8.nxv4p0(<vscale x 4 x ptr>, i32 immarg, <vscale x 4 x i1>, <vscale x 4 x i8>) #1
; Function Attrs: nocallback nofree nosync nounwind willreturn memory(write)
declare void @llvm.masked.scatter.nxv4i32.nxv4p0(<vscale x 4 x i32>, <vscale x 4 x ptr>, i32 immarg, <vscale x 4 x i1>) #2
attributes #0 = { "target-features"="+64bit,+v" }
attributes #1 = { nocallback nofree nosync nounwind willreturn memory(read) }
attributes #2 = { nocallback nofree nosync nounwind willreturn memory(write) }
```
Backtrace:
```
> /scratch/tc-testing/tc-feb-22-llvm/build/build-llvm-linux/bin/llc bugpoint-reduced-simplified.ll
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace.
Stack dump:
0. Program arguments: /scratch/tc-testing/tc-feb-22-llvm/build/build-llvm-linux/bin/llc bugpoint-reduced-simplified.ll
1. Running pass 'Function Pass Manager' on module 'bugpoint-reduced-simplified.ll'.
2. Running pass 'RISC-V DAG->DAG Pattern Instruction Selection' on function '@main'
#0 0x000055b76e342350 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/scratch/tc-testing/tc-feb-22-llvm/build/build-llvm-linux/bin/llc+0x1c89350)
#1 0x000055b76e33f75f llvm::sys::RunSignalHandlers() (/scratch/tc-testing/tc-feb-22-llvm/build/build-llvm-linux/bin/llc+0x1c8675f)
#2 0x000055b76e33f8b5 SignalHandler(int) Signals.cpp:0:0
#3 0x00007f8457242520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
#4 0x000055b76cd08cd3 llvm::RISCVDAGToDAGISel::Select(llvm::SDNode*) (/scratch/tc-testing/tc-feb-22-llvm/build/build-llvm-linux/bin/llc+0x64fcd3)
#5 0x000055b76e0d44ba llvm::SelectionDAGISel::DoInstructionSelection() (/scratch/tc-testing/tc-feb-22-llvm/build/build-llvm-linux/bin/llc+0x1a1b4ba)
#6 0x000055b76e0e239c llvm::SelectionDAGISel::CodeGenAndEmitDAG() (/scratch/tc-testing/tc-feb-22-llvm/build/build-llvm-linux/bin/llc+0x1a2939c)
#7 0x000055b76e0e5fbf llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&) (/scratch/tc-testing/tc-feb-22-llvm/build/build-llvm-linux/bin/llc+0x1a2cfbf)
#8 0x000055b76e0e7b35 llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&) (.part.0) SelectionDAGISel.cpp:0:0
#9 0x000055b76d2cddf7 llvm::MachineFunctionPass::runOnFunction(llvm::Function&) (.part.0) MachineFunctionPass.cpp:0:0
#10 0x000055b76d8b6cee llvm::FPPassManager::runOnFunction(llvm::Function&) (/scratch/tc-testing/tc-feb-22-llvm/build/build-llvm-linux/bin/llc+0x11fdcee)
#11 0x000055b76d8b6f39 llvm::FPPassManager::runOnModule(llvm::Module&) (/scratch/tc-testing/tc-feb-22-llvm/build/build-llvm-linux/bin/llc+0x11fdf39)
#12 0x000055b76d8b78a5 llvm::legacy::PassManagerImpl::run(llvm::Module&) (/scratch/tc-testing/tc-feb-22-llvm/build/build-llvm-linux/bin/llc+0x11fe8a5)
#13 0x000055b76cbebcda compileModule(char**, llvm::LLVMContext&) llc.cpp:0:0
#14 0x000055b76cb4b7c6 main (/scratch/tc-testing/tc-feb-22-llvm/build/build-llvm-linux/bin/llc+0x4927c6)
#15 0x00007f8457229d90 __libc_start_call_main ./csu/../sysdeps/nptl/libc_start_call_main.h:58:16
#16 0x00007f8457229e40 call_init ./csu/../csu/libc-start.c:128:20
#17 0x00007f8457229e40 __libc_start_main ./csu/../csu/libc-start.c:379:5
#18 0x000055b76cbe2505 _start (/scratch/tc-testing/tc-feb-22-llvm/build/build-llvm-linux/bin/llc+0x529505)
zsh: segmentation fault (core dumped) /scratch/tc-testing/tc-feb-22-llvm/build/build-llvm-linux/bin/llc
```
Godbolt: https://godbolt.org/z/c8v8h9fxo
Found via fuzzer
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