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<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - LLC crash caused by the naked function attribute"
href="https://bugs.llvm.org/show_bug.cgi?id=52399">52399</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>LLC crash caused by the naked function attribute
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>b2.temp@gmx.com
</td>
</tr>
<tr>
<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>## IR
---
; ModuleID = '<stdin>'
source_filename = "r"
; Function Attrs: noinline
define i32 @r.slow(i32 %0, i32 %1, i32 %2) #0 {
entry:
%3 = alloca [2 x i32], align 4
%4 = getelementptr [2 x i32], [2 x i32]* %3, i32 0, i32 0
store i32 %1, i32* %4, align 4
%5 = getelementptr [2 x i32], [2 x i32]* %3, i32 0, i32 1
store i32 %2, i32* %5, align 4
%6 = load [2 x i32], [2 x i32]* %3, align 4
store [2 x i32] %6, [2 x i32]* %3, align 4
%7 = getelementptr [2 x i32], [2 x i32]* %3, i32 0, i32 0
%8 = and i32 %0, 1
%9 = getelementptr i32, i32* %7, i32 %8
%10 = load i32, i32* %9, align 4
ret i32 %10
}
attributes #0 = { naked }
---
## backtrace
---
Output of llc (trunk) (Compiler #1)
PLEASE submit a bug report to <a href="https://bugs.llvm.org/">https://bugs.llvm.org/</a> 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 '@r.slow'
#0 0x00005647c8cf429f PrintStackTraceSignalHandler(void*) Signals.cpp:0:0
#1 0x00005647c8cf1b4d SignalHandler(int) Signals.cpp:0:0
#2 0x00007fd5a77ce3c0 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x153c0)
#3 0x00005647c6c71710 isBitfieldExtractOp(llvm::SelectionDAG*, llvm::SDNode*,
unsigned int&, llvm::SDValue&, unsigned int&, unsigned int&, unsigned int,
bool) (.part.271) AArch64ISelDAGToDAG.cpp:0:0
#4 0x00005647c8b3debe
llvm::TargetLowering::SimplifyDemandedBits(llvm::SDValue, llvm::APInt const&,
llvm::APInt const&, llvm::KnownBits&, llvm::TargetLowering::TargetLoweringOpt&,
unsigned int, bool) const
(/opt/compiler-explorer/clang-trunk/bin/llc+0x293debe)
#5 0x00005647c8b40b99
llvm::TargetLowering::SimplifyDemandedBits(llvm::SDValue, llvm::APInt const&,
llvm::APInt const&, llvm::KnownBits&, llvm::TargetLowering::TargetLoweringOpt&,
unsigned int, bool) const
(/opt/compiler-explorer/clang-trunk/bin/llc+0x2940b99)
#6 0x00005647c8b42118
llvm::TargetLowering::SimplifyDemandedBits(llvm::SDValue, llvm::APInt const&,
llvm::APInt const&, llvm::KnownBits&, llvm::TargetLowering::TargetLoweringOpt&,
unsigned int, bool) const
(/opt/compiler-explorer/clang-trunk/bin/llc+0x2942118)
#7 0x00005647c8b4603f
llvm::TargetLowering::SimplifyDemandedBits(llvm::SDValue, llvm::APInt const&,
llvm::KnownBits&, llvm::TargetLowering::TargetLoweringOpt&, unsigned int, bool)
const (/opt/compiler-explorer/clang-trunk/bin/llc+0x294603f)
#8 0x00005647c89ec769 (anonymous
namespace)::DAGCombiner::SimplifyDemandedBits(llvm::SDValue) (.constprop.1056)
DAGCombiner.cpp:0:0
#9 0x00005647c89f9a66 (anonymous
namespace)::DAGCombiner::visitADDLike(llvm::SDNode*) DAGCombiner.cpp:0:0
#10 0x00005647c89fabb5 (anonymous
namespace)::DAGCombiner::visitADD(llvm::SDNode*) DAGCombiner.cpp:0:0
#11 0x00005647c8a21c9c (anonymous namespace)::DAGCombiner::visit(llvm::SDNode*)
DAGCombiner.cpp:0:0
#12 0x00005647c8a235bd (anonymous
namespace)::DAGCombiner::combine(llvm::SDNode*) DAGCombiner.cpp:0:0
#13 0x00005647c8a24e9c llvm::SelectionDAG::Combine(llvm::CombineLevel,
llvm::AAResults*, llvm::CodeGenOpt::Level)
(/opt/compiler-explorer/clang-trunk/bin/llc+0x2824e9c)
#14 0x00005647c8b1d60f llvm::SelectionDAGISel::CodeGenAndEmitDAG()
(/opt/compiler-explorer/clang-trunk/bin/llc+0x291d60f)
#15 0x00005647c8b20d64
llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&)
(/opt/compiler-explorer/clang-trunk/bin/llc+0x2920d64)
#16 0x00005647c8b22ff2
llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&)
(.part.885) SelectionDAGISel.cpp:0:0
#17 0x00005647c78ad3f0 (anonymous
namespace)::X86DAGToDAGISel::runOnMachineFunction(llvm::MachineFunction&)
X86ISelDAGToDAG.cpp:0:0
#18 0x00005647c8136208
llvm::MachineFunctionPass::runOnFunction(llvm::Function&)
(/opt/compiler-explorer/clang-trunk/bin/llc+0x1f36208)
#19 0x00005647c85679d9 llvm::FPPassManager::runOnFunction(llvm::Function&)
(/opt/compiler-explorer/clang-trunk/bin/llc+0x23679d9)
#20 0x00005647c8567c71 llvm::FPPassManager::runOnModule(llvm::Module&)
(/opt/compiler-explorer/clang-trunk/bin/llc+0x2367c71)
#21 0x00005647c8568ee7 llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/opt/compiler-explorer/clang-trunk/bin/llc+0x2368ee7)
#22 0x00005647c6aa71c1 compileModule(char**, llvm::LLVMContext&) llc.cpp:0:0
#23 0x00005647c69d5e5e main
(/opt/compiler-explorer/clang-trunk/bin/llc+0x7d5e5e)
#24 0x00007fd5a727e0b3 __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x270b3)
#25 0x00005647c6a9edfa _start
(/opt/compiler-explorer/clang-trunk/bin/llc+0x89edfa)
Compiler returned: 139
---
## notes
while the naked attribute is missused, (since there's an alloca), llc should
not crash</pre>
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