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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - opt -instsimplify fails with Assertion `(L.contains(UserI) || isa<PHINode>(UserI)) && "Uses outside the loop should be PHI nodes due to LCSSA!"' failed."
href="https://bugs.llvm.org/show_bug.cgi?id=44759">44759</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>opt -instsimplify fails with Assertion `(L.contains(UserI) || isa<PHINode>(UserI)) && "Uses outside the loop should be PHI nodes due to LCSSA!"' failed.
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</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>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Loop Optimizer
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>mikael.holmen@ericsson.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=23081" name="attach_23081" title="bbi-15499.ll reproducer">attachment 23081</a> <a href="attachment.cgi?id=23081&action=edit" title="bbi-15499.ll reproducer">[details]</a></span>
bbi-15499.ll reproducer
Reproduce with:
opt -S -o - bbi-15499.ll -loop-instsimplify
Result:
opt: ../lib/Transforms/Scalar/LoopInstSimplify.cpp:132: bool
simplifyLoopInst(llvm::Loop &, llvm::DominatorTree &, llvm::LoopInfo &,
llvm::AssumptionCache &, const llvm::TargetLibraryInfo &,
llvm::MemorySSAUpdater *): Assertion `(L.contains(UserI) ||
isa<PHINode>(UserI)) && "Uses outside the loop should be PHI nodes due to
LCSSA!"' failed.
Stack dump:
0. Program arguments: ../../master/llvm/build-all-builtins/bin/opt -S -o -
bbi-15499.ll -loop-instsimplify
1. Running pass 'Function Pass Manager' on module 'bbi-15499.ll'.
2. Running pass 'Loop Pass Manager' on function '@f1'
3. Running pass 'Simplify instructions in loops' on basic block
'%for.cond1'
#0 0x0000000003f382b4 PrintStackTraceSignalHandler(void*)
(../../master/llvm/build-all-builtins/bin/opt+0x3f382b4)
#1 0x0000000003f35e7e llvm::sys::RunSignalHandlers()
(../../master/llvm/build-all-builtins/bin/opt+0x3f35e7e)
#2 0x0000000003f386bc SignalHandler(int)
(../../master/llvm/build-all-builtins/bin/opt+0x3f386bc)
#3 0x00007fc852f48890 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x12890)
#4 0x00007fc8519f1e97 raise
/build/glibc-OTsEL5/glibc-2.27/signal/../sysdeps/unix/sysv/linux/raise.c:51:0
#5 0x00007fc8519f3801 abort /build/glibc-OTsEL5/glibc-2.27/stdlib/abort.c:81:0
#6 0x00007fc8519e339a __assert_fail_base
/build/glibc-OTsEL5/glibc-2.27/assert/assert.c:89:0
#7 0x00007fc8519e3412 (/lib/x86_64-linux-gnu/libc.so.6+0x30412)
#8 0x0000000003ce9715 simplifyLoopInst(llvm::Loop&, llvm::DominatorTree&,
llvm::LoopInfo&, llvm::AssumptionCache&, llvm::TargetLibraryInfo const&,
llvm::MemorySSAUpdater*)
(../../master/llvm/build-all-builtins/bin/opt+0x3ce9715)
#9 0x0000000003cea08e (anonymous
namespace)::LoopInstSimplifyLegacyPass::runOnLoop(llvm::Loop*,
llvm::LPPassManager&) (../../master/llvm/build-all-builtins/bin/opt+0x3cea08e)
#10 0x00000000031497fb llvm::LPPassManager::runOnFunction(llvm::Function&)
(../../master/llvm/build-all-builtins/bin/opt+0x31497fb)
#11 0x00000000037a8794 llvm::FPPassManager::runOnFunction(llvm::Function&)
(../../master/llvm/build-all-builtins/bin/opt+0x37a8794)
#12 0x00000000037a8a48 llvm::FPPassManager::runOnModule(llvm::Module&)
(../../master/llvm/build-all-builtins/bin/opt+0x37a8a48)
#13 0x00000000037a909d llvm::legacy::PassManagerImpl::run(llvm::Module&)
(../../master/llvm/build-all-builtins/bin/opt+0x37a909d)
#14 0x000000000212da93 main
(../../master/llvm/build-all-builtins/bin/opt+0x212da93)
#15 0x00007fc8519d4b97 __libc_start_main
/build/glibc-OTsEL5/glibc-2.27/csu/../csu/libc-start.c:344:0
#16 0x000000000211502a _start
(../../master/llvm/build-all-builtins/bin/opt+0x211502a)
Abort (core dumped)
The input contains an unreachable block that I assume is the cause of the
problem.
This seems rather old, I start seeing it in builds from May 2018.</pre>
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