| Issue |
179074
|
| Summary |
Loop vectorizer crash in LLVM 22
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
Noratrieb
|
This code crashes in the loop vectorizer after LLVM 22 (`opt -passes=loop-vectorize`).
```llvm
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
define void @reproducer() {
entry:
br label %head
head: ; preds = %tail, %entry
%phi = phi ptr [ null, %entry ], [ %getelementptr, %tail ]
%getelementptr = getelementptr i8, ptr %phi, i64 12
br i1 false, label %tail, label %forward
forward: ; preds = %head
switch i32 0, label %tail [
i32 0, label %tail
]
tail: ; preds = %forward, %forward, %head
%phi5 = phi i32 [ 1, %forward ], [ 1, %forward ], [ 0, %head ]
%icmp = icmp eq ptr %getelementptr, null
br i1 %icmp, label %exit, label %head
exit: ; preds = %tail
ret void
}
```
```
Stack dump:
0. Program arguments: /home/nora/projects/rust/build/host/ci-llvm/bin/opt meta.ll -passes=loop-vectorize -disable-output
1. Running pass "function(loop-vectorize<no-interleave-forced-only;no-vectorize-forced-only;>)" on module "meta.ll"
2. Running pass "loop-vectorize<no-interleave-forced-only;no-vectorize-forced-only;>" on function "reproducer"
#0 0x00007f91e56c2008 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/home/nora/projects/rust/build/x86_64-unknown-linux-gnu/ci-llvm/bin/../lib/libLLVM.so.22.1-rust-1.95.0-nightly+0x58c2008)
#1 0x00007f91e56bebe5 llvm::sys::RunSignalHandlers() (/home/nora/projects/rust/build/x86_64-unknown-linux-gnu/ci-llvm/bin/../lib/libLLVM.so.22.1-rust-1.95.0-nightly+0x58bebe5)
#2 0x00007f91e56c2746 SignalHandler(int, siginfo_t*, void*) (/home/nora/projects/rust/build/x86_64-unknown-linux-gnu/ci-llvm/bin/../lib/libLLVM.so.22.1-rust-1.95.0-nightly+0x58c2746)
#3 0x00007f91dfa42790 __restore_rt (/nix/store/wb6rhpznjfczwlwx23zmdrrw74bayxw4-glibc-2.42-47/lib/libc.so.6+0x42790)
#4 0x00007f91e7879f77 llvm::VPlanTransforms::introduceMasksAndLinearize(llvm::VPlan&, bool) (/home/nora/projects/rust/build/x86_64-unknown-linux-gnu/ci-llvm/bin/../lib/libLLVM.so.22.1-rust-1.95.0-nightly+0x7a79f77)
#5 0x00007f91e7662efb llvm::LoopVectorizationPlanner::tryToBuildVPlanWithVPRecipes(std::unique_ptr<llvm::VPlan, std::default_delete<llvm::VPlan>>, llvm::VFRange&, llvm::LoopVersioning*) (/home/nora/projects/rust/build/x86_64-unknown-linux-gnu/ci-llvm/bin/../lib/libLLVM.so.22.1-rust-1.95.0-nightly+0x7862efb)
#6 0x00007f91e7654643 llvm::LoopVectorizationPlanner::buildVPlansWithVPRecipes(llvm::ElementCount, llvm::ElementCount) (/home/nora/projects/rust/build/x86_64-unknown-linux-gnu/ci-llvm/bin/../lib/libLLVM.so.22.1-rust-1.95.0-nightly+0x7854643)
#7 0x00007f91e7653ab6 llvm::LoopVectorizationPlanner::plan(llvm::ElementCount, unsigned int) (/home/nora/projects/rust/build/x86_64-unknown-linux-gnu/ci-llvm/bin/../lib/libLLVM.so.22.1-rust-1.95.0-nightly+0x7853ab6)
#8 0x00007f91e766beac llvm::LoopVectorizePass::processLoop(llvm::Loop*) (/home/nora/projects/rust/build/x86_64-unknown-linux-gnu/ci-llvm/bin/../lib/libLLVM.so.22.1-rust-1.95.0-nightly+0x786beac)
#9 0x00007f91e7678f8b llvm::LoopVectorizePass::runImpl(llvm::Function&) (/home/nora/projects/rust/build/x86_64-unknown-linux-gnu/ci-llvm/bin/../lib/libLLVM.so.22.1-rust-1.95.0-nightly+0x7878f8b)
#10 0x00007f91e76798c2 llvm::LoopVectorizePass::run(llvm::Function&, llvm::AnalysisManager<llvm::Function>&) (/home/nora/projects/rust/build/x86_64-unknown-linux-gnu/ci-llvm/bin/../lib/libLLVM.so.22.1-rust-1.95.0-nightly+0x78798c2)
#11 0x00007f91e592f22f llvm::PassManager<llvm::Function, llvm::AnalysisManager<llvm::Function>>::run(llvm::Function&, llvm::AnalysisManager<llvm::Function>&) (/home/nora/projects/rust/build/x86_64-unknown-linux-gnu/ci-llvm/bin/../lib/libLLVM.so.22.1-rust-1.95.0-nightly+0x5b2f22f)
#12 0x00007f91e5934490 llvm::ModuleToFunctionPassAdaptor::run(llvm::Module&, llvm::AnalysisManager<llvm::Module>&) (/home/nora/projects/rust/build/x86_64-unknown-linux-gnu/ci-llvm/bin/../lib/libLLVM.so.22.1-rust-1.95.0-nightly+0x5b34490)
#13 0x00007f91e592de99 llvm::PassManager<llvm::Module, llvm::AnalysisManager<llvm::Module>>::run(llvm::Module&, llvm::AnalysisManager<llvm::Module>&) (/home/nora/projects/rust/build/x86_64-unknown-linux-gnu/ci-llvm/bin/../lib/libLLVM.so.22.1-rust-1.95.0-nightly+0x5b2de99)
#14 0x000055bb94c79523 llvm::runPassPipeline(llvm::StringRef, llvm::Module&, llvm::TargetMachine*, llvm::TargetLibraryInfoImpl*, llvm::ToolOutputFile*, llvm::ToolOutputFile*, llvm::ToolOutputFile*, llvm::StringRef, llvm::ArrayRef<llvm::PassPlugin>, llvm::ArrayRef<std::function<void (llvm::PassBuilder&)>>, llvm::opt_tool::OutputKind, llvm::opt_tool::VerifierKind, bool, bool, bool, bool, bool, bool, bool, bool) (/home/nora/projects/rust/build/host/ci-llvm/bin/opt+0x2a523)
#15 0x000055bb94c6b6ca optMain (/home/nora/projects/rust/build/host/ci-llvm/bin/opt+0x1c6ca)
#16 0x00007f91dfa2b285 __libc_start_call_main (/nix/store/wb6rhpznjfczwlwx23zmdrrw74bayxw4-glibc-2.42-47/lib/libc.so.6+0x2b285)
#17 0x00007f91dfa2b338 __libc_start_main@GLIBC_2.2.5 (/nix/store/wb6rhpznjfczwlwx23zmdrrw74bayxw4-glibc-2.42-47/lib/libc.so.6+0x2b338)
#18 0x000055bb94c67e49 _start (/home/nora/projects/rust/build/host/ci-llvm/bin/opt+0x18e49)
```
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