[llvm-bugs] [Bug 43458] New: loop-unroll crashes: Assertion `OuterL->isLCSSAForm(*DT) && "Loops should be in LCSSA form after loop-unroll."' failed.

Thu Sep 26 01:34:17 PDT 2019

https://bugs.llvm.org/show_bug.cgi?id=43458

            Bug ID: 43458
           Summary: loop-unroll crashes: Assertion
                    `OuterL->isLCSSAForm(*DT) && "Loops should be in LCSSA
                    form after loop-unroll."' 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 22573
  --> https://bugs.llvm.org/attachment.cgi?id=22573&action=edit
bugpoint-reduced-simplified.bc

$clang -v
clang version 10.0.0 (trunk 372856)
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  bugpoint-reduced-simplified.bc -loop-reduce -loop-unroll
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/Transforms/Utils/LoopUnroll.cpp:942:
llvm::LoopUnrollResult llvm::UnrollLoop(llvm::Loop*, llvm::UnrollLoopOptions,
llvm::LoopInfo*, llvm::ScalarEvolution*, llvm::DominatorTree*,
llvm::AssumptionCache*, llvm::OptimizationRemarkEmitter*, bool, llvm::Loop**):
Assertion `OuterL->isLCSSAForm(*DT) && "Loops should be in LCSSA form after
loop-unroll."' failed.
Stack dump:
0.      Program arguments:
/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt
bugpoint-reduced-simplified.bc -loop-reduce -loop-unroll 
1.      Running pass 'Function Pass Manager' on module
'bugpoint-reduced-simplified.bc'.
2.      Running pass 'Loop Pass Manager' on function '@jpeg_make_c_derived_tbl'
3.      Running pass 'Unroll loops' on basic block '%.lr.ph27'
 #0 0x000055d08271005a llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x278405a)
 #1 0x000055d08270dd34 llvm::sys::RunSignalHandlers()
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x2781d34)
 #2 0x000055d08270de72 SignalHandler(int)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x2781e72)
 #3 0x00007f1974dbb890 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x12890)
 #4 0x00007f1973a6de97 raise
/build/glibc-OTsEL5/glibc-2.27/signal/../sysdeps/unix/sysv/linux/raise.c:51:0
 #5 0x00007f1973a6f801 abort /build/glibc-OTsEL5/glibc-2.27/stdlib/abort.c:81:0
 #6 0x00007f1973a5f39a __assert_fail_base
/build/glibc-OTsEL5/glibc-2.27/assert/assert.c:89:0
 #7 0x00007f1973a5f412 (/lib/x86_64-linux-gnu/libc.so.6+0x30412)
 #8 0x000055d0827b145f llvm::UnrollLoop(llvm::Loop*, llvm::UnrollLoopOptions,
llvm::LoopInfo*, llvm::ScalarEvolution*, llvm::DominatorTree*,
llvm::AssumptionCache*, llvm::OptimizationRemarkEmitter*, bool, llvm::Loop**)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x282545f)
 #9 0x000055d082554492 tryToUnrollLoop(llvm::Loop*, llvm::DominatorTree&,
llvm::LoopInfo*, llvm::ScalarEvolution&, llvm::TargetTransformInfo const&,
llvm::AssumptionCache&, llvm::OptimizationRemarkEmitter&,
llvm::BlockFrequencyInfo*, llvm::ProfileSummaryInfo*, bool, int, bool, bool,
llvm::Optional<unsigned int>, llvm::Optional<unsigned int>,
llvm::Optional<bool>, llvm::Optional<bool>, llvm::Optional<bool>,
llvm::Optional<bool>, llvm::Optional<bool>, llvm::Optional<unsigned int>)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x25c8492)
#10 0x000055d082554971 (anonymous
namespace)::LoopUnroll::runOnLoop(llvm::Loop*, llvm::LPPassManager&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x25c8971)
#11 0x000055d0819dfe7b llvm::LPPassManager::runOnFunction(llvm::Function&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x1a53e7b)
#12 0x000055d08204e9a9 llvm::FPPassManager::runOnFunction(llvm::Function&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x20c29a9)
#13 0x000055d08204eaa1 llvm::FPPassManager::runOnModule(llvm::Module&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x20c2aa1)
#14 0x000055d08204dc01 llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x20c1c01)
#15 0x000055d08081d94f main
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x89194f)
#16 0x00007f1973a50b97 __libc_start_main
/build/glibc-OTsEL5/glibc-2.27/csu/../csu/libc-start.c:344:0
#17 0x000055d080895a7a _start
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x909a7a)
Aborted (core dumped)

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