[llvm-bugs] [Bug 43474] New: simple-loop-unswitch crashes: Assertion `L.isRecursivelyLCSSAForm(DT, LI) && "Loops must be in LCSSA form before unswitching."' failed.

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=43474

            Bug ID: 43474
           Summary: simple-loop-unswitch crashes: Assertion
                    `L.isRecursivelyLCSSAForm(DT, LI) && "Loops must be in
                    LCSSA form before unswitching."' 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 22586
  --> https://bugs.llvm.org/attachment.cgi?id=22586&action=edit
bugpoint-reduced-simplified.bc

$clang -v
clang version 10.0.0 (trunk 372974)
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-interchange -simple-loop-unswitch
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/Scalar/SimpleLoopUnswitch.cpp:2802:
bool unswitchLoop(llvm::Loop&, llvm::DominatorTree&, llvm::LoopInfo&,
llvm::AssumptionCache&, llvm::TargetTransformInfo&, bool,
llvm::function_ref<void(bool, llvm::ArrayRef<llvm::Loop*>)>,
llvm::ScalarEvolution*, llvm::MemorySSAUpdater*): Assertion
`L.isRecursivelyLCSSAForm(DT, LI) && "Loops must be in LCSSA form before
unswitching."' failed.
Stack dump:
0.      Program arguments:
/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt
bugpoint-reduced-simplified.bc -loop-interchange -simple-loop-unswitch 
1.      Running pass 'Function Pass Manager' on module
'bugpoint-reduced-simplified.bc'.
2.      Running pass 'Loop Pass Manager' on function '@main'
3.      Running pass 'Simple unswitch loops' on basic block '%._crit_edge147'
 #0 0x000055c1d1f86baa llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x2783baa)
 #1 0x000055c1d1f84884 llvm::sys::RunSignalHandlers()
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x2781884)
 #2 0x000055c1d1f849c2 SignalHandler(int)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x27819c2)
 #3 0x00007fe3ecd1c890 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x12890)
 #4 0x00007fe3eb9cee97 raise
/build/glibc-OTsEL5/glibc-2.27/signal/../sysdeps/unix/sysv/linux/raise.c:51:0
 #5 0x00007fe3eb9d0801 abort /build/glibc-OTsEL5/glibc-2.27/stdlib/abort.c:81:0
 #6 0x00007fe3eb9c039a __assert_fail_base
/build/glibc-OTsEL5/glibc-2.27/assert/assert.c:89:0
 #7 0x00007fe3eb9c0412 (/lib/x86_64-linux-gnu/libc.so.6+0x30412)
 #8 0x000055c1d1e88856 (anonymous
namespace)::SimpleLoopUnswitchLegacyPass::runOnLoop(llvm::Loop*,
llvm::LPPassManager&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x2685856)
 #9 0x000055c1d125762b llvm::LPPassManager::runOnFunction(llvm::Function&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x1a5462b)
#10 0x000055c1d18c5209 llvm::FPPassManager::runOnFunction(llvm::Function&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x20c2209)
#11 0x000055c1d18c5301 llvm::FPPassManager::runOnModule(llvm::Module&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x20c2301)
#12 0x000055c1d18c4461 llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x20c1461)
#13 0x000055c1d0094b4f main
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x891b4f)
#14 0x00007fe3eb9b1b97 __libc_start_main
/build/glibc-OTsEL5/glibc-2.27/csu/../csu/libc-start.c:344:0
#15 0x000055c1d010cc7a _start
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x909c7a)
Aborted (core dumped)

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