https://llvm.org/bugs/show_bug.cgi?id=25369
Bug ID: 25369
Summary: [SCEV] Assertion `PN->getNumIncomingValues() == 2 &&
"Follows from having one latch!"' failed.
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Loop Optimizer
Assignee: unassignedb...@nondot.org
Reporter: tob...@grosser.es
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Created attachment 15199
--> https://llvm.org/bugs/attachment.cgi?id=15199&action=edit
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
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