[llvm-bugs] [Bug 41484] New: loop-reduce pass crashed after running it twice

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=41484

            Bug ID: 41484
           Summary: loop-reduce pass crashed after running it twice
           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 21771
  --> https://bugs.llvm.org/attachment.cgi?id=21771&action=edit
.bc file of the source code

$clang -v
clang version 9.0.0 (trunk 355281)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/jack-zhou/Documents/llvm/llvm_truck/llvm/build4/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/7.3.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/8
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.3.0
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64

$clang -O3 -c -emit-llvm  -mllvm -disable-llvm-optzns small.c

$opt -jump-threading -sroa -loop-reduce -loop-reduce small.bc -o small-opt.bc
Stack dump:
0.      Program arguments:
/home/jack-zhou/Documents/llvm/llvm_truck/llvm/build4/bin/opt -jump-threading
-sroa -loop-reduce -loop-reduce small.bc -o small-opt.bc 
1.      Running pass 'Function Pass Manager' on module 'small.bc'.
2.      Running pass 'Loop Pass Manager' on function '@a'
3.      Running pass 'Loop Strength Reduction' on basic block '%1'
 #0 0x00005604ed5d8d2a llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm/build4/bin/opt+0x20d9d2a)
 #1 0x00005604ed5d6d04 llvm::sys::RunSignalHandlers()
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm/build4/bin/opt+0x20d7d04)
 #2 0x00005604ed5d6e42 SignalHandler(int)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm/build4/bin/opt+0x20d7e42)
 #3 0x00007f32d99ae890 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x12890)
 #4 0x00005604eca86e97 llvm::ScalarEvolution::createSCEV(llvm::Value*)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm/build4/bin/opt+0x1587e97)
 #5 0x00005604eca88620 llvm::ScalarEvolution::getSCEV(llvm::Value*)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm/build4/bin/opt+0x1589620)
 #6 0x00005604ec99a332 llvm::IVUsers::getExpr(llvm::IVStrideUse const&) const
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm/build4/bin/opt+0x149b332)
 #7 0x00005604ed437695 (anonymous
namespace)::LSRInstance::CollectInterestingTypesAndFactors()
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm/build4/bin/opt+0x1f38695)
 #8 0x00005604ed444488 ReduceLoopStrength(llvm::Loop*, llvm::IVUsers&,
llvm::ScalarEvolution&, llvm::DominatorTree&, llvm::LoopInfo&,
llvm::TargetTransformInfo const&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm/build4/bin/opt+0x1f45488)
 #9 0x00005604ec9fdfeb llvm::LPPassManager::runOnFunction(llvm::Function&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm/build4/bin/opt+0x14fefeb)
#10 0x00005604ecf927a9 llvm::FPPassManager::runOnFunction(llvm::Function&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm/build4/bin/opt+0x1a937a9)
#11 0x00005604ecf92831 llvm::FPPassManager::runOnModule(llvm::Module&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm/build4/bin/opt+0x1a93831)
#12 0x00005604ecf91b59 llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm/build4/bin/opt+0x1a92b59)
#13 0x00005604ebb2f153 main
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm/build4/bin/opt+0x630153)
#14 0x00007f32d8643b97 __libc_start_main
/build/glibc-OTsEL5/glibc-2.27/csu/../csu/libc-start.c:344:0
#15 0x00005604ebbc3f6a _start
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm/build4/bin/opt+0x6c4f6a)
Segmentation fault (core dumped)

By using godbolt, llvm 6/7/trunk version also have this problem.

---------------------------------------------
a() {
  int b;
  for (; b; b++)
    ;
}

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