[llvm-bugs] [Bug 42264] New: opt crashes with "opt -simplifycfg -early-cse-memssa -die -gvn-hoist": Assertion `AL->size() == ActualAccesses.size() && "We don't have the same number of accesses in the block as on the " "access list"' failed.

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=42264

            Bug ID: 42264
           Summary: opt crashes with "opt -simplifycfg -early-cse-memssa
                    -die -gvn-hoist": Assertion `AL->size() ==
                    ActualAccesses.size() && "We don't have the same
                    number of accesses in the block as on the " "access
                    list"' 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 22088
  --> https://bugs.llvm.org/attachment.cgi?id=22088&action=edit
.bc file of the source code

$clang -v
clang version 9.0.0 (trunk 362492)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build/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

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

$opt -simplifycfg -early-cse-memssa -die -gvn-hoist small.bc -o small-opt.bc
opt:
/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/lib/Analysis/MemorySSA.cpp:1940:
void llvm::MemorySSA::verifyOrdering(llvm::Function&) const: Assertion
`AL->size() == ActualAccesses.size() && "We don't have the same number of
accesses in the block as on the " "access list"' failed.
Stack dump:
0.      Program arguments:
/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build/bin/opt -simplifycfg
-early-cse-memssa -die -gvn-hoist small.bc -o small-opt.bc 
1.      Running pass 'Function Pass Manager' on module 'small.bc'.
 #0 0x0000557c3bb85cea llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build/bin/opt+0x255bcea)
 #1 0x0000557c3bb839a4 llvm::sys::RunSignalHandlers()
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build/bin/opt+0x25599a4)
 #2 0x0000557c3bb83ae2 SignalHandler(int)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build/bin/opt+0x2559ae2)
 #3 0x00007fd4298a5890 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x12890)
 #4 0x00007fd428557e97 raise
/build/glibc-OTsEL5/glibc-2.27/signal/../sysdeps/unix/sysv/linux/raise.c:51:0
 #5 0x00007fd428559801 abort /build/glibc-OTsEL5/glibc-2.27/stdlib/abort.c:81:0
 #6 0x00007fd42854939a __assert_fail_base
/build/glibc-OTsEL5/glibc-2.27/assert/assert.c:89:0
 #7 0x00007fd428549412 (/lib/x86_64-linux-gnu/libc.so.6+0x30412)
 #8 0x0000557c3af26ec3 llvm::MemorySSA::verifyOrdering(llvm::Function&) const
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build/bin/opt+0x18fcec3)
 #9 0x0000557c3af2b505 llvm::MemorySSA::verifyMemorySSA() const
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build/bin/opt+0x1901505)
#10 0x0000557c3b53e949
llvm::PMDataManager::verifyPreservedAnalysis(llvm::Pass*)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build/bin/opt+0x1f14949)
#11 0x0000557c3b542ce8 llvm::FPPassManager::runOnFunction(llvm::Function&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build/bin/opt+0x1f18ce8)
#12 0x0000557c3b543061 llvm::FPPassManager::runOnModule(llvm::Module&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build/bin/opt+0x1f19061)
#13 0x0000557c3b5421c1 llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build/bin/opt+0x1f181c1)
#14 0x0000557c39e3c889 main
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build/bin/opt+0x812889)
#15 0x00007fd42853ab97 __libc_start_main
/build/glibc-OTsEL5/glibc-2.27/csu/../csu/libc-start.c:344:0
#16 0x0000557c39ec0aba _start
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build/bin/opt+0x896aba)
Aborted (core dumped)

---------------------------------------------
int a=0;
void b() {
  int *c = &a;
  if (*c)
    ;
}

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