[llvm-bugs] [Bug 43645] New: loop-versioning crashes: Assertion `L->getLoopPreheader() && "Can't expand add recurrences without a loop preheader!"' failed.

Fri Oct 11 03:17:45 PDT 2019

https://bugs.llvm.org/show_bug.cgi?id=43645

            Bug ID: 43645
           Summary: loop-versioning crashes: Assertion
                    `L->getLoopPreheader() && "Can't expand add
                    recurrences without a loop preheader!"' failed.
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Scalar Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: cszide at 163.com
                CC: llvm-bugs at lists.llvm.org

Created attachment 22653
  --> https://bugs.llvm.org/attachment.cgi?id=22653&action=edit
CHOLESKY1.bc

$clang -v
clang version 10.0.0 (trunk 373844)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.4.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/8
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.4.0
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64

$opt -loop-rotate -mem2reg -loop-unswitch -loop-unswitch -simplifycfg
-loop-versioning CHOLESKY1.bc 
WARNING: You're attempting to print out a bitcode file.
This is inadvisable as it may cause display problems. If
you REALLY want to taste LLVM bitcode first-hand, you
can force output with the `-f' option.

opt:
/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/lib/Analysis/ScalarEvolutionExpander.cpp:1267:
llvm::PHINode* llvm::SCEVExpander::getAddRecExprPHILiterally(const
llvm::SCEVAddRecExpr*, const llvm::Loop*, llvm::Type*, llvm::Type*,
llvm::Type*&, bool&): Assertion `L->getLoopPreheader() && "Can't expand add
recurrences without a loop preheader!"' failed.
Stack dump:
0.      Program arguments:
/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt -loop-rotate
-mem2reg -loop-unswitch -loop-unswitch -simplifycfg -loop-versioning
CHOLESKY1.bc 
1.      Running pass 'Function Pass Manager' on module 'CHOLESKY1.bc'.
2.      Running pass 'Loop Versioning' on function '@ScatterUpdateFO2'
 #0 0x00005617069b7baa llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x2791baa)
 #1 0x00005617069b5884 llvm::sys::RunSignalHandlers()
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x278f884)
 #2 0x00005617069b59c2 SignalHandler(int)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x278f9c2)
 #3 0x00007fe158508890 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x12890)
 #4 0x00007fe1571bae97 raise
/build/glibc-OTsEL5/glibc-2.27/signal/../sysdeps/unix/sysv/linux/raise.c:51:0
 #5 0x00007fe1571bc801 abort /build/glibc-OTsEL5/glibc-2.27/stdlib/abort.c:81:0
 #6 0x00007fe1571ac39a __assert_fail_base
/build/glibc-OTsEL5/glibc-2.27/assert/assert.c:89:0
 #7 0x00007fe1571ac412 (/lib/x86_64-linux-gnu/libc.so.6+0x30412)
 #8 0x0000561705d65fe2
llvm::SCEVExpander::getAddRecExprPHILiterally(llvm::SCEVAddRecExpr const*,
llvm::Loop const*, llvm::Type*, llvm::Type*, llvm::Type*&, bool&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x1b3ffe2)
 #9 0x0000561705d661b4
llvm::SCEVExpander::expandAddRecExprLiterally(llvm::SCEVAddRecExpr const*)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x1b401b4)
#10 0x0000561705d62a60 llvm::SCEVExpander::expand(llvm::SCEV const*)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x1b3ca60)
#11 0x0000561705d62f9c llvm::SCEVExpander::expandCodeFor(llvm::SCEV const*,
llvm::Type*)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x1b3cf9c)
#12 0x0000561705c5b6cb
expandBounds(llvm::RuntimePointerChecking::CheckingPtrGroup const*,
llvm::Loop*, llvm::Instruction*, llvm::SCEVExpander&, llvm::ScalarEvolution*,
llvm::RuntimePointerChecking const&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x1a356cb)
#13 0x0000561705c5bbf8
llvm::LoopAccessInfo::addRuntimeChecks(llvm::Instruction*,
llvm::SmallVectorImpl<std::pair<llvm::RuntimePointerChecking::CheckingPtrGroup
const*, llvm::RuntimePointerChecking::CheckingPtrGroup const*> > const&) const
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x1a35bf8)
#14 0x0000561706a7ad82
llvm::LoopVersioning::versionLoop(llvm::SmallVectorImpl<llvm::Instruction*>
const&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x2854d82)
#15 0x0000561706a7c6f0 (anonymous
namespace)::LoopVersioningPass::runOnFunction(llvm::Function&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x28566f0)
#16 0x00005617062f1a49 llvm::FPPassManager::runOnFunction(llvm::Function&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x20cba49)
#17 0x00005617062f1b19 llvm::FPPassManager::runOnModule(llvm::Module&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x20cbb19)
#18 0x00005617062f0ca1 llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x20caca1)
#19 0x0000561704abc01f main
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x89601f)
#20 0x00007fe15719db97 __libc_start_main
/build/glibc-OTsEL5/glibc-2.27/csu/../csu/libc-start.c:344:0
#21 0x0000561704b3421a _start
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x90e21a)
Aborted (core dumped)

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