[llvm-bugs] [Bug 37632] New: opt crashes with "opt -early-cse-memssa -jump-threading -mem2reg": Assertion `!contains(New, this) && "this->replaceAllUsesWith(expr(this)) is NOT valid!"' failed

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=37632

            Bug ID: 37632
           Summary: opt crashes with "opt -early-cse-memssa
                    -jump-threading -mem2reg": Assertion `!contains(New,
                    this) && "this->replaceAllUsesWith(expr(this)) is NOT
                    valid!"' failed
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Scalar Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: su at cs.ucdavis.edu
                CC: llvm-bugs at lists.llvm.org

Tested with trunk revision 333424.

$ clangpolly -v
clang version 7.0.0 (http://llvm.org/git/clang.git
3de179a61e5c29a0f91918da87c692756bc755b4) (llvm/trunk 333424)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/su/bin
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9.4
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5.3.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4.7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7.3
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8.5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.3.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.2.0
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64
$ 
$ clangpolly -O3 -mllvm -disable-llvm-optzns -c -emit-llvm -o small.bc small.c
$   
$ optpolly -early-cse-memssa -jump-threading -mem2reg -o small-opt.bc small.bc
optpolly: /home/su/software/tmp/polly/llvm/lib/IR/Value.cpp:411: void
llvm::Value::doRAUW(llvm::Value*, bool): Assertion `!contains(New, this) &&
"this->replaceAllUsesWith(expr(this)) is NOT valid!"' failed.
Stack dump:
0.      Program arguments: optpolly -early-cse-memssa -jump-threading -mem2reg
-o small-opt.bc small.bc 
1.      Running pass 'Function Pass Manager' on module 'small.bc'.
2.      Running pass 'Promote Memory to Register' on function '@main'
LLVMSymbolizer: error reading file: No such file or directory
#0 0x00000000021c43ea (optpolly+0x21c43ea)
#1 0x00000000021c28da (optpolly+0x21c28da)
#2 0x00000000021c2a09 (optpolly+0x21c2a09)
#3 0x00007f507f7ca330 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x10330)
#4 0x00007f507e5b2c37 gsignal
/build/eglibc-SvCtMH/eglibc-2.19/signal/../nptl/sysdeps/unix/sysv/linux/raise.c:56:0
#5 0x00007f507e5b6028 abort
/build/eglibc-SvCtMH/eglibc-2.19/stdlib/abort.c:91:0
#6 0x00007f507e5abbf6 __assert_fail_base
/build/eglibc-SvCtMH/eglibc-2.19/assert/assert.c:92:0
#7 0x00007f507e5abca2 (/lib/x86_64-linux-gnu/libc.so.6+0x2fca2)
#8 0x0000000001ce8c46 (optpolly+0x1ce8c46)
#9 0x0000000002284bc5 (optpolly+0x2284bc5)
#10 0x0000000002286217 (optpolly+0x2286217)
#11 0x00000000022717ff (optpolly+0x22717ff)
#12 0x0000000001ca1183 (optpolly+0x1ca1183)
#13 0x0000000001ca123c (optpolly+0x1ca123c)
#14 0x0000000001ca193a (optpolly+0x1ca193a)
#15 0x00000000008e776c (optpolly+0x8e776c)
#16 0x00007f507e59df45 __libc_start_main
/build/eglibc-SvCtMH/eglibc-2.19/csu/libc-start.c:321:0
#17 0x0000000000961226 (optpolly+0x961226)
Aborted (core dumped)
$ 


--------------------------------


int main ()
{
  while (0)
    for (int a = 0; a; a++)
      a--;
  return 0;
}

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