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<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - 3+ minutes is spent in ScalarEvolution on a tiny test"
href="https://bugs.llvm.org/show_bug.cgi?id=33753">33753</a>
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<th>Summary</th>
<td>3+ minutes is spent in ScalarEvolution on a tiny test
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</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>kcc@google.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
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<pre>on r307569
clang -cc1 -triple x86_64-unknown-linux-gnu -O2 -emit-obj
slow-ScalarEvolution.cc
Most time is spent in ScalarEvolution::getAddExpr:
#24 0x000000000134118a in
llvm::ScalarEvolution::getAddExpr(llvm::SmallVectorImpl<llvm::SCEV const*>&,
llvm::SCEV::NoWrapFlags, unsigned int) ()
#25 0x000000000133f9a7 in
llvm::ScalarEvolution::getAddExpr(llvm::SmallVectorImpl<llvm::SCEV const*>&,
llvm::SCEV::NoWrapFlags, unsigned int) ()
#26 0x00000000013402d0 in
llvm::ScalarEvolution::getAddExpr(llvm::SmallVectorImpl<llvm::SCEV const*>&,
llvm::SCEV::NoWrapFlags, unsigned int) ()
#27 0x000000000134f5be in llvm::ScalarEvolution::createSCEV(llvm::Value*) ()
#28 0x000000000134bb01 in llvm::ScalarEvolution::getSCEV(llvm::Value*) ()
#29 0x0000000001a9271a in (anonymous
namespace)::LSRInstance::ChainInstruction(llvm::Instruction*,
llvm::Instruction*, llvm::SmallVectorImpl<(anonymous namespace)::ChainUsers>&)
()
#30 0x0000000001a81f7f in (anonymous
namespace)::LSRInstance::LSRInstance(llvm::Loop*, llvm::IVUsers&,
llvm::ScalarEvolution&, llvm::DominatorTree&, llvm::LoopInfo&,
llvm::TargetTransformInfo const&) ()
#31 0x0000000001a7ebdf in ReduceLoopStrength(llvm::Loop*, llvm::IVUsers&,
llvm::ScalarEvolution&, llvm::DominatorTree&, llvm::LoopInfo&,
llvm::TargetTransformInfo const&) ()
#32 0x0000000001307720 in llvm::LPPassManager::runOnFunction(llvm::Function&)
()
Found by an experimental clang-proto-fuzzer</pre>
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