[llvm-bugs] [Bug 31185] New: opt crashes with "opt -mem2reg -instcombine -indvars -jump-threading -loop-rotate -loop-vectorize": Assertion `isa<X>(Val) && "cast<Ty>() argument of incompatible type!"' failed

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=31185

            Bug ID: 31185
           Summary: opt crashes with "opt -mem2reg -instcombine -indvars
                    -jump-threading -loop-rotate -loop-vectorize":
                    Assertion `isa<X>(Val) && "cast<Ty>() argument of
                    incompatible type!"' failed
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Scalar Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: su at cs.ucdavis.edu
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

$ clang -v
clang version 4.0.0 (trunk 287975)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/clang-trunk/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
$ 
$ clang -c -emit-llvm -w -o small.bc small.c
$ opt -mem2reg -instcombine -indvars -jump-threading -loop-rotate
-loop-vectorize -o small-opt.bc small.bc
opt: /tmp/llvm-builder/llvm-source-trunk/include/llvm/Support/Casting.h:236:
typename llvm::cast_retty<X, Y*>::ret_type llvm::cast(Y*) [with X =
llvm::Instruction; Y = llvm::Value; typename llvm::cast_retty<X, Y*>::ret_type
= llvm::Instruction*]: Assertion `isa<X>(Val) && "cast<Ty>() argument of
incompatible type!"' failed.
#0 0x0000000001c45a45 (opt+0x1c45a45)
#1 0x0000000001c43b2e (opt+0x1c43b2e)
#2 0x0000000001c43c90 (opt+0x1c43c90)
#3 0x00007f1290016330 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x10330)
#4 0x00007f128ee02c37 gsignal
/build/eglibc-oGUzwX/eglibc-2.19/signal/../nptl/sysdeps/unix/sysv/linux/raise.c:56:0
#5 0x00007f128ee06028 abort
/build/eglibc-oGUzwX/eglibc-2.19/stdlib/abort.c:91:0
#6 0x00007f128edfbbf6 __assert_fail_base
/build/eglibc-oGUzwX/eglibc-2.19/assert/assert.c:92:0
#7 0x00007f128edfbca2 (/lib/x86_64-linux-gnu/libc.so.6+0x2fca2)
#8 0x00000000006d0694 (opt+0x6d0694)
#9 0x00000000013d6a21 (opt+0x13d6a21)
#10 0x0000000001d53b83 (opt+0x1d53b83)
#11 0x0000000001d63e58 (opt+0x1d63e58)
#12 0x0000000001d6ccfe (opt+0x1d6ccfe)
#13 0x0000000001d6d605 (opt+0x1d6d605)
#14 0x0000000001d6dc96 (opt+0x1d6dc96)
#15 0x00000000017dfe83 (opt+0x17dfe83)
#16 0x00000000017dff2c (opt+0x17dff2c)
#17 0x00000000017e0bda (opt+0x17e0bda)
#18 0x000000000078c9a1 (opt+0x78c9a1)
#19 0x00007f128ededf45 __libc_start_main
/build/eglibc-oGUzwX/eglibc-2.19/csu/libc-start.c:321:0
#20 0x00000000007e6f4b (opt+0x7e6f4b)
Stack dump:
0.      Program arguments: opt -mem2reg -instcombine -indvars -jump-threading
-loop-rotate -loop-vectorize -o small-opt.bc small.bc 
1.      Running pass 'Function Pass Manager' on module 'small.bc'.
2.      Running pass 'Loop Vectorization' on function '@fn1'
Aborted (core dumped)
$ 


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


void fn1 ()
{
  int a = 1;
  short b, c;
  for (b = 1; b; b++)
    {
      for (c = 0; c < 0; c--)
        ;
      a = c;
    }
  a && 1;
}

int main ()
{
  fn1 (); 
  return 0;
}

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