| Issue |
176674
|
| Summary |
[LLVM] Crash in UpgradeIntrinsicCall - "Use still stuck around after Def is destroyed" for llvm.x86.sse2.pshuflw
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
sairam2661
|
**Fuzzer Generated Test**
**Test Commit**
[0b2f3cfb72a76fa90f3ec2a234caabe0d0712590](https://github.com/llvm/llvm-project/commit/0b2f3cfb72a76fa90f3ec2a234caabe0d0712590)
**Description**
The intrinsic upgrade logic crashes when `llvm.x86.sse2.pshuflw` is called with `<4 x i32>` instead of the expected `<8 x i16>`. It attempts to erase the old call while uses still exist.
**Steps to reproduce**
- Minimized test case, `input.ll`
```
define void @test(ptr %a) {
%v = call <4 x i32> @llvm.x86.sse2.pshuflw.128(<4 x i32> zeroinitializer, i8 0)
store <4 x i32> %v, ptr %a
ret void
}
```
**Command**
```
opt -passes=verify -S input.ll
```
**Output**
```
While deleting: <4 x i32> %v
Use still stuck around after Def is destroyed: store <4 x i32> %v, ptr %a, align 16
Uses remain when a value is destroyed!
UNREACHABLE executed at /workdir/llvm-project/llvm/lib/IR/Value.cpp:102!
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace and instructions to reproduce the bug.
Stack dump:
0. Program arguments: opt -passes=verify -S input.ll
#0 0x00007fc61e506728 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/workdir/llvm-project/build-libcxx/bin/../lib/libLLVMSupport.so.22.0git+0x1d3728)
#1 0x00007fc61e5039d5 llvm::sys::RunSignalHandlers() (/workdir/llvm-project/build-libcxx/bin/../lib/libLLVMSupport.so.22.0git+0x1d09d5)
#2 0x00007fc61e5073c6 SignalHandler(int, siginfo_t*, void*) Signals.cpp:0:0
#3 0x00007fc62862f420 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x14420)
#4 0x00007fc61e01a00b raise /build/glibc-B3wQXB/glibc-2.31/signal/../sysdeps/unix/sysv/linux/raise.c:51:1
#5 0x00007fc61dff9859 abort /build/glibc-B3wQXB/glibc-2.31/stdlib/abort.c:81:7
#6 0x00007fc61e42d0ff (/workdir/llvm-project/build-libcxx/bin/../lib/libLLVMSupport.so.22.0git+0xfa0ff)
#7 0x00007fc61e9ca334 llvm::Value::~Value() (/workdir/llvm-project/build-libcxx/bin/../lib/libLLVMCore.so.22.0git+0x312334)
#8 0x00007fc61e9c9f86 llvm::Value::deleteValue() (/workdir/llvm-project/build-libcxx/bin/../lib/libLLVMCore.so.22.0git+0x311f86)
#9 0x00007fc61e918190 llvm::Instruction::eraseFromParent() (/workdir/llvm-project/build-libcxx/bin/../lib/libLLVMCore.so.22.0git+0x260190)
#10 0x00007fc61e79dcd8 llvm::UpgradeIntrinsicCall(llvm::CallBase*, llvm::Function*) (/workdir/llvm-project/build-libcxx/bin/../lib/libLLVMCore.so.22.0git+0xe5cd8)
#11 0x00007fc61ee3003e llvm::LLParser::validateEndOfModule(bool) (/workdir/llvm-project/build-libcxx/bin/../lib/libLLVMAsmParser.so.22.0git+0x3503e)
#12 0x00007fc61ee2ee3a llvm::LLParser::Run(bool, llvm::function_ref<std::__1::optional<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>> (llvm::StringRef, llvm::StringRef)>) (/workdir/llvm-project/build-libcxx/bin/../lib/libLLVMAsmParser.so.22.0git+0x33e3a)
#13 0x00007fc61ee80642 parseAssemblyInto(llvm::MemoryBufferRef, llvm::Module*, llvm::ModuleSummaryIndex*, llvm::SMDiagnostic&, llvm::SlotMapping*, bool, llvm::function_ref<std::__1::optional<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>> (llvm::StringRef, llvm::StringRef)>, llvm::AsmParserContext*) Parser.cpp:0:0
#14 0x00007fc61ee80802 llvm::parseAssembly(llvm::MemoryBufferRef, llvm::SMDiagnostic&, llvm::LLVMContext&, llvm::SlotMapping*, llvm::function_ref<std::__1::optional<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>> (llvm::StringRef, llvm::StringRef)>, llvm::AsmParserContext*) (/workdir/llvm-project/build-libcxx/bin/../lib/libLLVMAsmParser.so.22.0git+0x85802)
#15 0x00007fc61eeb83b8 llvm::parseIR(llvm::MemoryBufferRef, llvm::SMDiagnostic&, llvm::LLVMContext&, llvm::ParserCallbacks, llvm::AsmParserContext*) (/workdir/llvm-project/build-libcxx/bin/../lib/libLLVMIRReader.so.22.0git+0x33b8)
#16 0x00007fc61eeb8cdf llvm::parseIRFile(llvm::StringRef, llvm::SMDiagnostic&, llvm::LLVMContext&, llvm::ParserCallbacks, llvm::AsmParserContext*) (/workdir/llvm-project/build-libcxx/bin/../lib/libLLVMIRReader.so.22.0git+0x3cdf)
#17 0x00007fc6285f436e optMain (/workdir/llvm-project/build-libcxx/bin/../lib/libLLVMOptDriver.so.22.0git+0x3636e)
#18 0x00007fc61dffb083 __libc_start_main /build/glibc-B3wQXB/glibc-2.31/csu/../csu/libc-start.c:342:3
#19 0x000055b42f86607e _start (/workdir/llvm-project/build-libcxx/bin/opt+0x207e)
Aborted (core dumped)
```
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