[llvm-bugs] [Bug 43533] New: indvars crashes: Assertion `L->isRecursivelyLCSSAForm(*DT, *LI) && "LCSSA required to run indvars!"' failed.

via llvm-bugs llvm-bugs at lists.llvm.org
Tue Oct 1 19:15:21 PDT 2019 

https://bugs.llvm.org/show_bug.cgi?id=43533

            Bug ID: 43533
           Summary: indvars crashes: Assertion
                    `L->isRecursivelyLCSSAForm(*DT, *LI) && "LCSSA
                    required to run indvars!"' 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 22616
  --> https://bugs.llvm.org/attachment.cgi?id=22616&action=edit
office_ispell.bc

$clang -v
clang version 10.0.0 (trunk 373303)
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 -instcombine -sroa -jump-threading -loop-unroll-and-jam
-early-cse-memssa -nary-reassociate -indvars office_ispell.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/Transforms/Scalar/IndVarSimplify.cpp:2758:
bool {anonymous}::IndVarSimplify::run(llvm::Loop*): Assertion
`L->isRecursivelyLCSSAForm(*DT, *LI) && "LCSSA required to run indvars!"'
failed.
Stack dump:
0.      Program arguments:
/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt -loop-rotate
-instcombine -sroa -jump-threading -loop-unroll-and-jam -early-cse-memssa
-nary-reassociate -indvars office_ispell.bc 
1.      Running pass 'Function Pass Manager' on module 'office_ispell.bc'.
2.      Running pass 'Loop Pass Manager' on function '@main'
3.      Running pass 'Induction Variable Simplification' on basic block
'%while.cond'
 #0 0x00005575ce7a155a llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x278655a)
 #1 0x00005575ce79f234 llvm::sys::RunSignalHandlers()
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x2784234)
 #2 0x00005575ce79f372 SignalHandler(int)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x2784372)
 #3 0x00007f5c5428c890 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x12890)
 #4 0x00007f5c52f3ee97 raise
/build/glibc-OTsEL5/glibc-2.27/signal/../sysdeps/unix/sysv/linux/raise.c:51:0
 #5 0x00007f5c52f40801 abort /build/glibc-OTsEL5/glibc-2.27/stdlib/abort.c:81:0
 #6 0x00007f5c52f3039a __assert_fail_base
/build/glibc-OTsEL5/glibc-2.27/assert/assert.c:89:0
 #7 0x00007f5c52f30412 (/lib/x86_64-linux-gnu/libc.so.6+0x30412)
 #8 0x00005575ce5422c9 (anonymous
namespace)::IndVarSimplifyLegacyPass::runOnLoop(llvm::Loop*,
llvm::LPPassManager&) (.part.477)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x25272c9)
 #9 0x00005575cda6e33b llvm::LPPassManager::runOnFunction(llvm::Function&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x1a5333b)
#10 0x00005575ce0dd309 llvm::FPPassManager::runOnFunction(llvm::Function&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x20c2309)
#11 0x00005575ce0dd3d9 llvm::FPPassManager::runOnModule(llvm::Module&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x20c23d9)
#12 0x00005575ce0dc561 llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x20c1561)
#13 0x00005575cc8afdbf main
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x894dbf)
#14 0x00007f5c52f21b97 __libc_start_main
/build/glibc-OTsEL5/glibc-2.27/csu/../csu/libc-start.c:344:0
#15 0x00005575cc927f4a _start
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x90cf4a)
Aborted (core dumped)

The optimization sequence can be reduced to "-nary-reassociate -indvars" using
bugpoint.

$opt bugpoint-reduced-simplified.bc -nary-reassociate -indvars
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/IndVarSimplify.cpp:2758:
bool {anonymous}::IndVarSimplify::run(llvm::Loop*): Assertion
`L->isRecursivelyLCSSAForm(*DT, *LI) && "LCSSA required to run indvars!"'
failed.
Stack dump:
0.      Program arguments:
/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt
bugpoint-reduced-simplified.bc -nary-reassociate -indvars 
1.      Running pass 'Function Pass Manager' on module
'bugpoint-reduced-simplified.bc'.
2.      Running pass 'Loop Pass Manager' on function '@main'
3.      Running pass 'Induction Variable Simplification' on basic block
'%while.cond'
 #0 0x000055ada21fd55a llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x278655a)
 #1 0x000055ada21fb234 llvm::sys::RunSignalHandlers()
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x2784234)
 #2 0x000055ada21fb372 SignalHandler(int)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x2784372)
 #3 0x00007ff696918890 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x12890)
 #4 0x00007ff6955cae97 raise
/build/glibc-OTsEL5/glibc-2.27/signal/../sysdeps/unix/sysv/linux/raise.c:51:0
 #5 0x00007ff6955cc801 abort /build/glibc-OTsEL5/glibc-2.27/stdlib/abort.c:81:0
 #6 0x00007ff6955bc39a __assert_fail_base
/build/glibc-OTsEL5/glibc-2.27/assert/assert.c:89:0
 #7 0x00007ff6955bc412 (/lib/x86_64-linux-gnu/libc.so.6+0x30412)
 #8 0x000055ada1f9e2c9 (anonymous
namespace)::IndVarSimplifyLegacyPass::runOnLoop(llvm::Loop*,
llvm::LPPassManager&) (.part.477)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x25272c9)
 #9 0x000055ada14ca33b llvm::LPPassManager::runOnFunction(llvm::Function&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x1a5333b)
#10 0x000055ada1b39309 llvm::FPPassManager::runOnFunction(llvm::Function&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x20c2309)
#11 0x000055ada1b393d9 llvm::FPPassManager::runOnModule(llvm::Module&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x20c23d9)
#12 0x000055ada1b38561 llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x20c1561)
#13 0x000055ada030bdbf main
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x894dbf)
#14 0x00007ff6955adb97 __libc_start_main
/build/glibc-OTsEL5/glibc-2.27/csu/../csu/libc-start.c:344:0
#15 0x000055ada0383f4a _start
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x90cf4a)
Aborted (core dumped)

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