[llvm-bugs] [Bug 25344] New: LNT build fails with -polly-position=before-vectorizer

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=25344

            Bug ID: 25344
           Summary: LNT build fails with -polly-position=before-vectorizer
           Product: Projects
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Polly
          Assignee: polly-dev at googlegroups.com
          Reporter: llvm at meinersbur.de
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Command to invoke:

bin/lnt runtest nt -j8 \
    --sandbox "${SANDBOX}" \
    --cc clang --cxx clang++ --mllvm -polly \
    --test-suite llvm/projects/test-suite 0j8 \
    --mllvm -polly-position=before-vectorizer

Failing tests:

FAIL: MultiSource/Benchmarks/7zip/7zip-benchmark.compile_time (1 of 1992)
FAIL: MultiSource/Benchmarks/sim/sim.execution_time (499 of 1992)
FAIL:
SingleSource/Benchmarks/Polybench/medley/reg_detect/reg_detect.execution_time
(500 of 1992)

7zip-benchmark fails with an assertion:

llvm::ScalarEvolution::getConstantEvolutionLoopExitValue(llvm::PHINode*, const
llvm::APInt&, const llvm::Loop*): Assertion `PN->getNumIncomingValues() == 2 &&
"Follows from having one latch!"' failed.
0  clang-3.8       0x00000000019d57f8
llvm::sys::PrintStackTrace(llvm::raw_ostream&) + 56
1  clang-3.8       0x00000000019d4106 llvm::sys::RunSignalHandlers() + 54
2  clang-3.8       0x00000000019d433a
3  libpthread.so.0 0x00007fb09d634d10
4  libc.so.6       0x00007fb09c7d4267 gsignal + 55
5  libc.so.6       0x00007fb09c7d5eca abort + 362
6  libc.so.6       0x00007fb09c7cd03d
7  libc.so.6       0x00007fb09c7cd0f2
8  clang-3.8       0x0000000001289dcf
9  clang-3.8       0x00000000012a629a
10 clang-3.8       0x00000000012a6a89
llvm::ScalarEvolution::getSCEVAtScope(llvm::SCEV const*, llvm::Loop const*) +
201
[...]


sim and reg_detect faiil because the output differs from the reference output.

Using trunk revision 251341.

Also see
http://gcc12.fsffrance.org:8011/builders/perf-x86_64-penryn-O3-polly/builds/389

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