[polly] r211957 - Allow multiple reductions per statement

[Johannes Doerfert]

I will look into it as soon as possible but I'm not sure how to execute this test case.
I tried to find the stacktrace you showed my in on the buildbot page, but I can't.
Is there by any chance also the clang command line options used in some log? If
so can you point me to the url or send it to me?

If not I'll try to find the error without it.

On 06/29, Tobias Grosser wrote:
> On 27/06/2014 22:31, Johannes Doerfert wrote:
> >Author: jdoerfert
> >Date: Fri Jun 27 15:31:28 2014
> >New Revision: 211957
> >
> >URL: http://llvm.org/viewvc/llvm-project?rev=211957&view=rev
> >Log:
> >Allow multiple reductions per statement
> >
> >   Iterate over all store memory accesses and check for valid binary reduction
> >   candidate loads by following the operands of the stored value.  For each
> >   candidate pair we check if they have the same base address and there are no
> >   other accesses which may overlap with them. This ensures that no intermediate
> >   value can escape into other memory locations or is overwritten at some point.
> >
> >   + 17 test cases for reduction detection and reduction dependency modeling
> 
> Hi Johannes,
> 
> I believe this change broke our LLVM nightly test runs:
> 
> http://lab.llvm.org:8011/builders/polly-perf-O3-polly/builds/885
> 
> The compilation of 'clamscan' fails.
> 
> Here the stack trace produced:
> 
> 0   llvm::sys::PrintStackTrace(_IO_FILE*) + 34
> 1
> 2
> 3   polly::MemoryAccess::getAccessRelation() const + 0
> 4   polly::ScopStmt::checkForReductions() + 403
> 5   polly::ScopStmt::ScopStmt(polly::Scop&, polly::TempScop&, llvm::Region
> const&, llvm::BasicBlock&, llvm::SmallVectorImpl<llvm::Loop*>&,
> llvm::SmallVectorImpl<unsigned int>&) + 1159
> 6   polly::Scop::buildScop(polly::TempScop&, llvm::Region const&,
> llvm::SmallVectorImpl<llvm::Loop*>&, llvm::SmallVectorImpl<unsigned int>&,
> llvm::LoopInfo&) + 1297
> 7   polly::Scop::Scop(polly::TempScop&, llvm::LoopInfo&,
> llvm::ScalarEvolution&, isl_ctx*) + 441
> 8   polly::ScopInfo::runOnRegion(llvm::Region*, llvm::RGPassManager&) + 555
> 9   llvm::RGPassManager::runOnFunction(llvm::Function&) + 1287
> 10  llvm::FPPassManager::runOnFunction(llvm::Function&) + 655
> 11  llvm::legacy::FunctionPassManagerImpl::run(llvm::Function&) + 163
> 12  llvm::legacy::FunctionPassManager::run(llvm::Function&) + 105
> 13  clang::EmitBackendOutput(clang::DiagnosticsEngine&,
> clang::CodeGenOptions const&, clang::TargetOptions const&,
> clang::LangOptions const&, llvm::StringRef, llvm::Module*,
> clang::BackendAction, llvm::raw_ostream*) + 2957
> 14
> 15  clang::ParseAST(clang::Sema&, bool, bool) + 522
> 16  clang::CodeGenAction::ExecuteAction() + 78
> 17  clang::FrontendAction::Execute() + 150
> 18  clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) + 293
> 19  clang::ExecuteCompilerInvocation(clang::CompilerInstance*) + 1532
> 20  cc1_main(char const**, char const**, char const*, void*) + 1176
> 21  main + 5340
> 22  __libc_start_main + 253
> 
> Cheers,
> Tobias
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