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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 - opt -div-rem-pairs crashes on code not reachable from entry"
href="https://bugs.llvm.org/show_bug.cgi?id=45885">45885</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>opt -div-rem-pairs crashes on code not reachable from entry
</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>Scalar Optimizations
</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>
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<div>
<pre>Created <span class=""><a href="attachment.cgi?id=23471" name="attach_23471" title="bbi-42695.ll reproducer">attachment 23471</a> <a href="attachment.cgi?id=23471&action=edit" title="bbi-42695.ll reproducer">[details]</a></span>
bbi-42695.ll reproducer
Reproduce with:
opt -div-rem-pairs -S -o - bbi-42695.ll
Result:
opt: ../include/llvm/ADT/DenseMap.h:1241: llvm::DenseMapIterator::pointer
llvm::DenseMapIterator<llvm::BasicBlock *,
std::unique_ptr<llvm::DomTreeNodeBase<llvm::BasicBlock>,
std::default_delete<llvm::DomTreeNodeBase<llvm::BasicBlock> > >,
llvm::DenseMapInfo<llvm::BasicBlock *>,
llvm::detail::DenseMapPair<llvm::BasicBlock *,
std::unique_ptr<llvm::DomTreeNodeBase<llvm::BasicBlock>,
std::default_delete<llvm::DomTreeNodeBase<llvm::BasicBlock> > > >,
true>::operator->() const [KeyT = llvm::BasicBlock *, ValueT =
std::unique_ptr<llvm::DomTreeNodeBase<llvm::BasicBlock>,
std::default_delete<llvm::DomTreeNodeBase<llvm::BasicBlock> > >, KeyInfoT =
llvm::DenseMapInfo<llvm::BasicBlock *>, Bucket =
llvm::detail::DenseMapPair<llvm::BasicBlock *,
std::unique_ptr<llvm::DomTreeNodeBase<llvm::BasicBlock>,
std::default_delete<llvm::DomTreeNodeBase<llvm::BasicBlock> > > >, IsConst =
true]: Assertion `Ptr != End && "dereferencing end() iterator"' failed.
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: ../../master/llvm/build-all-builtins/bin/opt
-div-rem-pairs -S -o - bbi-42695.ll
1. Running pass 'Function Pass Manager' on module 'bbi-42695.ll'.
2. Running pass 'Hoist/decompose integer division and remainder' on
function '@g'
#0 0x0000000004399a94 PrintStackTraceSignalHandler(void*)
(../../master/llvm/build-all-builtins/bin/opt+0x4399a94)
#1 0x00000000043975ee llvm::sys::RunSignalHandlers()
(../../master/llvm/build-all-builtins/bin/opt+0x43975ee)
#2 0x0000000004399dac SignalHandler(int)
(../../master/llvm/build-all-builtins/bin/opt+0x4399dac)
#3 0x00007f1bb8a2c890 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x12890)
#4 0x00007f1bb74d5e97 raise
/build/glibc-OTsEL5/glibc-2.27/signal/../sysdeps/unix/sysv/linux/raise.c:51:0
#5 0x00007f1bb74d7801 abort /build/glibc-OTsEL5/glibc-2.27/stdlib/abort.c:81:0
#6 0x00007f1bb74c739a __assert_fail_base
/build/glibc-OTsEL5/glibc-2.27/assert/assert.c:89:0
#7 0x00007f1bb74c7412 (/lib/x86_64-linux-gnu/libc.so.6+0x30412)
#8 0x000000000366f57f llvm::isGuaranteedNotToBeUndefOrPoison(llvm::Value
const*, llvm::Instruction const*, llvm::DominatorTree const*, unsigned int)
(../../master/llvm/build-all-builtins/bin/opt+0x366f57f)
#9 0x0000000004096800 optimizeDivRem(llvm::Function&,
llvm::TargetTransformInfo const&, llvm::DominatorTree const&)
(../../master/llvm/build-all-builtins/bin/opt+0x4096800)
#10 0x0000000003c0a784 llvm::FPPassManager::runOnFunction(llvm::Function&)
(../../master/llvm/build-all-builtins/bin/opt+0x3c0a784)
#11 0x0000000003c0aa58 llvm::FPPassManager::runOnModule(llvm::Module&)
(../../master/llvm/build-all-builtins/bin/opt+0x3c0aa58)
#12 0x0000000003c0b0ad llvm::legacy::PassManagerImpl::run(llvm::Module&)
(../../master/llvm/build-all-builtins/bin/opt+0x3c0b0ad)
#13 0x0000000002430e05 main
(../../master/llvm/build-all-builtins/bin/opt+0x2430e05)
#14 0x00007f1bb74b8b97 __libc_start_main
/build/glibc-OTsEL5/glibc-2.27/csu/../csu/libc-start.c:344:0
#15 0x000000000241b02a _start
(../../master/llvm/build-all-builtins/bin/opt+0x241b02a)
Abort (core dumped)
The input contains a basic block unreachable from entry that I suppose causes
the problem:
for.cond: ; preds = %for.cond
%rem = srem i16 1, %rem
%div.i = sdiv i16 1, %rem
br label %for.cond
Starts happening with 49f75132bc (which fixes
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - DivRemPairs is incorrect in the presence of undef"
href="show_bug.cgi?id=42619">https://bugs.llvm.org/show_bug.cgi?id=42619</a>):
[DivRemPairs] Freeze operands if they can be undef values</pre>
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