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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - opt -memoryssa -loop-simplify -early-cse-memssa crashing with MemorySSA.cpp:2019: void llvm::MemorySSA::verifyDefUses(llvm::Function &) const: Assertion `find(predecessors(&B), Phi->getIncomingBlock(I)) != pred_end(&B) && "Incoming phi block not a block p"
href="https://bugs.llvm.org/show_bug.cgi?id=41853">41853</a>
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</tr>
<tr>
<th>Summary</th>
<td>opt -memoryssa -loop-simplify -early-cse-memssa crashing with MemorySSA.cpp:2019: void llvm::MemorySSA::verifyDefUses(llvm::Function &) const: Assertion `find(predecessors(&B), Phi->getIncomingBlock(I)) != pred_end(&B) && "Incoming phi block not a block p
</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>mikael.holmen@ericsson.com
</td>
</tr>
<tr>
<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=21938" name="attach_21938" title="Reproducer">attachment 21938</a> <a href="attachment.cgi?id=21938&action=edit" title="Reproducer">[details]</a></span>
Reproducer
Running
opt -S -o - memssa.ll -memoryssa -loop-simplify -early-cse-memssa
yields
opt: ../lib/Analysis/MemorySSA.cpp:2019: void
llvm::MemorySSA::verifyDefUses(llvm::Function &) const: Assertion
`find(predecessors(&B), Phi->getIncomingBlock(I)) != pred_end(&B) && "Incoming
phi block not a block predecessor"' failed.
Stack dump:
0. Program arguments: build-all/bin/opt -S -o - memssa.ll -memoryssa
-loop-simplify -early-cse-memssa
1. Running pass 'Function Pass Manager' on module 'memssa.ll'.
#0 0x000000000237b634 PrintStackTraceSignalHandler(void*)
(build-all/bin/opt+0x237b634)
#1 0x0000000002379600 llvm::sys::RunSignalHandlers()
(build-all/bin/opt+0x2379600)
#2 0x000000000237b998 SignalHandler(int) (build-all/bin/opt+0x237b998)
#3 0x00007fea800d6330 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x10330)
#4 0x00007fea7ecc5c37 raise
/build/eglibc-xkFqqE/eglibc-2.19/signal/../nptl/sysdeps/unix/sysv/linux/raise.c:56:0
#5 0x00007fea7ecc9028 abort
/build/eglibc-xkFqqE/eglibc-2.19/stdlib/abort.c:91:0
#6 0x00007fea7ecbebf6 __assert_fail_base
/build/eglibc-xkFqqE/eglibc-2.19/assert/assert.c:92:0
#7 0x00007fea7ecbeca2 (/lib/x86_64-linux-gnu/libc.so.6+0x2fca2)
#8 0x00000000017d1a5d llvm::MemorySSA::verifyDefUses(llvm::Function&) const
(build-all/bin/opt+0x17d1a5d)
#9 0x00000000017d45c1 llvm::MemorySSAWrapperPass::verifyAnalysis() const
(build-all/bin/opt+0x17d45c1)
#10 0x0000000001d717a9
llvm::PMDataManager::verifyPreservedAnalysis(llvm::Pass*)
(build-all/bin/opt+0x1d717a9)
#11 0x0000000001d74f9f llvm::FPPassManager::runOnFunction(llvm::Function&)
(build-all/bin/opt+0x1d74f9f)
#12 0x0000000001d751d8 llvm::FPPassManager::runOnModule(llvm::Module&)
(build-all/bin/opt+0x1d751d8)
#13 0x0000000001d7567a llvm::legacy::PassManagerImpl::run(llvm::Module&)
(build-all/bin/opt+0x1d7567a)
#14 0x00000000007d936e main (build-all/bin/opt+0x7d936e)
#15 0x00007fea7ecb0f45 __libc_start_main
/build/eglibc-xkFqqE/eglibc-2.19/csu/libc-start.c:321:0
#16 0x00000000007bd9f9 _start (build-all/bin/opt+0x7bd9f9)
Abort
When the assertion fails we have:
(gdb) call F.dump()
define void @loop_imm_reg_plus2() {
br i1 undef, label %bb5.preheader, label %bb3
bb5.preheader: ; preds = %0
br label %bb5
bb5: ; preds = %bb5.preheader,
%bb5
store i16 undef, i16* undef
br i1 false, label %bb5, label %bb3.loopexit
bb3.loopexit: ; preds = %bb5
br label %bb3
bb3: ; preds = %bb3.loopexit, %0
ret void
}
(gdb) call B.getName()
$11 = "bb5"
(gdb) call Phi->dump()
2 = MemoryPhi({%0,liveOnEntry},{bb5,1})
This starts happening with r360270:
[MemorySSA] Teach LoopSimplify to preserve MemorySSA.</pre>
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