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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 - clang hangs when using -frounding-math on arm"
href="https://bugs.llvm.org/show_bug.cgi?id=44384">44384</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>clang hangs when using -frounding-math on arm
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>All
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</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>LLVM Codegen
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>raj.khem@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=22964" name="attach_22964" title="testcase">attachment 22964</a> <a href="attachment.cgi?id=22964&action=edit" title="testcase">[details]</a></span>
testcase
Attached testcase ( from musl C library source code) is rendering clang hang
forever with 100% CPU usage
version info:
=============
clang -cc1 version 10.0.0 based upon LLVM 10.0.0git default target
x86_64-unknown-linux-gnu
cmdline:
========
/mnt/b/yoe/build/tmp/work/armv7vet2hf-neon-yoe-linux-musleabi/musl/1.1.24+gitAUTOINC+d01fdc777d-r0/recipe-sysroot-native/usr/bin/clang-10
-cc1 -triple armv7ve-yoe-linux-musleabi -emit-obj -frounding-math a.c
Trace
=====
here is stacktrace when breaking inside debugger
#0 0x0000555557c74c8c in llvm::SmallPtrSetImplBase::insert_imp_big(void
const*) ()
#1 0x0000555558906767 in llvm::SelectionDAG::Legalize() ()
#2 0x00005555589aab5f in llvm::SelectionDAGISel::CodeGenAndEmitDAG() ()
#3 0x00005555589ae908 in
llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&) ()
#4 0x00005555589b15d9 in
llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&) ()
#5 0x0000555556944194 in ?? ()
#6 0x00005555572a50ea in ?? ()
#7 0x0000555557619787 in llvm::FPPassManager::runOnFunction(llvm::Function&)
()
#8 0x000055555761a6a3 in llvm::FPPassManager::runOnModule(llvm::Module&) ()
#9 0x000055555761aac9 in llvm::legacy::PassManagerImpl::run(llvm::Module&) ()
#10 0x0000555557f112d7 in clang::EmitBackendOutput(clang::DiagnosticsEngine&,
clang::HeaderSearchOptions const&, clang::CodeGenOptions const&,
clang::TargetOptions const&, clang::LangOptions const&, llvm::DataLayout
const&, llvm::Module*, clang::BackendAction,
std::unique_ptr<llvm::raw_pwrite_stream,
std::default_delete<llvm::raw_pwrite_stream> >) ()
#11 0x0000555558aaaf12 in ?? ()
#12 0x00005555594b8fd9 in clang::ParseAST(clang::Sema&, bool, bool) ()
#13 0x0000555558aab28c in clang::CodeGenAction::ExecuteAction() ()
#14 0x00005555584bae49 in clang::FrontendAction::Execute() ()
#15 0x000055555847268b in
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) ()
#16 0x000055555857d0a7 in
clang::ExecuteCompilerInvocation(clang::CompilerInstance*) ()
#17 0x000055555648733a in cc1_main(llvm::ArrayRef<char const*>, char const*,
void*) ()
#18 0x0000555556415142 in main ()</pre>
</div>
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