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<base href="https://llvm.org/bugs/" />
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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 --- - [SCEV] Assertion `PN->getNumIncomingValues() == 2 && "Follows from having one latch!"' failed."
href="https://llvm.org/bugs/show_bug.cgi?id=25369">25369</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>[SCEV] Assertion `PN->getNumIncomingValues() == 2 && "Follows from having one latch!"' 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>normal
</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>tobias@grosser.es
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=15199" name="attach_15199" title="Test case">attachment 15199</a> <a href="attachment.cgi?id=15199&action=edit" title="Test case">[details]</a></span>
Test case
Since r249712 SCEV fails to compute backedge taken counts for loops with more
than one entering edge (to the loop header). This has been working before.
opt -scalar-evolution -analyze out.ll
Printing analysis 'Scalar Evolution Analysis' for function 'hoge':
Classifying expressions for: @hoge
%tmp = add i32 %tmp10, -1
--> (-1 + (2 * undef) + %tmp7 + %tmp6) U: full-set S: full-setopt:
/home/grosser/Projects/polly/git/lib/Analysis/ScalarEvolution.cpp:5757:
llvm::Constant
*llvm::ScalarEvolution::getConstantEvolutionLoopExitValue(llvm::PHINode *,
const llvm::APInt &, const llvm::Loop *): Assertion `PN->getNumIncomingValues()
== 2 && "Follows from having one latch!"' failed.
0 opt 0x0000000001869e4e
llvm::sys::PrintStackTrace(llvm::raw_ostream&) + 46
1 opt 0x000000000186af89
2 opt 0x00000000018699c3 llvm::sys::RunSignalHandlers() + 131
3 opt 0x000000000186b1e4
4 libpthread.so.0 0x00007fac6085dd10
5 libc.so.6 0x00007fac5ff96267 gsignal + 55
6 libc.so.6 0x00007fac5ff97eca abort + 362
7 libc.so.6 0x00007fac5ff8f03d
8 libc.so.6 0x00007fac5ff8f0f2
9 opt 0x0000000000c9d979
llvm::ScalarEvolution::getConstantEvolutionLoopExitValue(llvm::PHINode*,
llvm::APInt const&, llvm::Loop const*) + 601
10 opt 0x0000000000c9e612
llvm::ScalarEvolution::computeSCEVAtScope(llvm::SCEV const*, llvm::Loop const*)
+ 466
11 opt 0x0000000000c99a69
llvm::ScalarEvolution::getSCEVAtScope(llvm::SCEV const*, llvm::Loop const*) +
921
12 opt 0x0000000000c9ed19
llvm::ScalarEvolution::computeSCEVAtScope(llvm::SCEV const*, llvm::Loop const*)
+ 2265
13 opt 0x0000000000c99a69
llvm::ScalarEvolution::getSCEVAtScope(llvm::SCEV const*, llvm::Loop const*) +
921
14 opt 0x0000000000ca5d75
llvm::ScalarEvolution::print(llvm::raw_ostream&) const + 597
15 opt 0x0000000000ca79d0
llvm::ScalarEvolutionWrapperPass::print(llvm::raw_ostream&, llvm::Module
const*) const + 48
16 opt 0x000000000078d574
17 opt 0x0000000001304ebf
llvm::FPPassManager::runOnFunction(llvm::Function&) + 399
18 opt 0x00000000013051d5
llvm::FPPassManager::runOnModule(llvm::Module&) + 117
19 opt 0x000000000130596a
20 opt 0x0000000001305496
llvm::legacy::PassManagerImpl::run(llvm::Module&) + 342
21 opt 0x0000000001305e81
llvm::legacy::PassManager::run(llvm::Module&) + 33
22 opt 0x0000000000799670 main + 7984
23 libc.so.6 0x00007fac5ff81a40 __libc_start_main + 240
24 opt 0x0000000000774e49 _start + 41</pre>
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