[llvm-bugs] [Bug 31190] New: opt crashes with "opt -simplifycfg -instcombine -loop-rotate -licm -loop-vectorize": Assertion `Idx >= 0 && "Invalid basic block argument!"' failed

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=31190

            Bug ID: 31190
           Summary: opt crashes with "opt -simplifycfg -instcombine
                    -loop-rotate -licm -loop-vectorize": Assertion `Idx >=
                    0 && "Invalid basic block argument!"' 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 287994)
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 -o small.bc small.c
$ opt -simplifycfg -instcombine -loop-rotate -licm -loop-vectorize -o
small-opt.bc small.bc
opt: /tmp/llvm-builder/llvm-source-trunk/include/llvm/IR/Instructions.h:2640:
llvm::Value* llvm::PHINode::getIncomingValueForBlock(const llvm::BasicBlock*)
const: Assertion `Idx >= 0 && "Invalid basic block argument!"' failed.
#0 0x0000000001c45c65 (opt+0x1c45c65)
#1 0x0000000001c43d4e (opt+0x1c43d4e)
#2 0x0000000001c43eb0 (opt+0x1c43eb0)
#3 0x00007f3f1ea0a330 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x10330)
#4 0x00007f3f1d7f6c37 gsignal
/build/eglibc-oGUzwX/eglibc-2.19/signal/../nptl/sysdeps/unix/sysv/linux/raise.c:56:0
#5 0x00007f3f1d7fa028 abort
/build/eglibc-oGUzwX/eglibc-2.19/stdlib/abort.c:91:0
#6 0x00007f3f1d7efbf6 __assert_fail_base
/build/eglibc-oGUzwX/eglibc-2.19/assert/assert.c:92:0
#7 0x00007f3f1d7efca2 (/lib/x86_64-linux-gnu/libc.so.6+0x2fca2)
#8 0x0000000000747c1e (opt+0x747c1e)
#9 0x0000000001cc9214 (opt+0x1cc9214)
#10 0x0000000001d69446 (opt+0x1d69446)
#11 0x0000000001d6b35c (opt+0x1d6b35c)
#12 0x0000000001d6d7b5 (opt+0x1d6d7b5)
#13 0x0000000001d6de46 (opt+0x1d6de46)
#14 0x00000000017e0053 (opt+0x17e0053)
#15 0x00000000017e00fc (opt+0x17e00fc)
#16 0x00000000017e0daa (opt+0x17e0daa)
#17 0x000000000078cfc1 (opt+0x78cfc1)
#18 0x00007f3f1d7e1f45 __libc_start_main
/build/eglibc-oGUzwX/eglibc-2.19/csu/libc-start.c:321:0
#19 0x00000000007e756b (opt+0x7e756b)
Stack dump:
0.      Program arguments: opt -simplifycfg -instcombine -loop-rotate -licm
-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)
$ 


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


int a, b[1], c;

void fn1 ()
{
  for (; c; c++)
    for (a = 0; a; a++)
      b[c] = 4;
}

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

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