[Bug tree-optimization/83774] New: ICE at -O3 with -Wall: Segmentation fault

[su at cs dot ucdavis.edu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83774

            Bug ID: 83774
           Summary: ICE at -O3 with -Wall: Segmentation fault
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: su at cs dot ucdavis.edu
  Target Milestone: ---

This appears to be a very recent regression. 

$ gcctk -v
Using built-in specs.
COLLECT_GCC=gcctk
COLLECT_LTO_WRAPPER=/home/su/software/tmp/gcc/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/8.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-source-trunk/configure --enable-languages=c,c++,lto
--prefix=/home/su/software/tmp/gcc/gcc-trunk --disable-bootstrap
Thread model: posix
gcc version 8.0.0 20180110 (experimental) [trunk revision 256427] (GCC)
$
$ gcctk -O3 small.c
$ 
$ gcctk -O3 -Wall small.c
during GIMPLE pass: uninit
small.c: In function ‘main’:
small.c:6:5: internal compiler error: Segmentation fault
 int main ()
     ^~~~
0xc95c5f crash_signal
        ../../gcc-source-trunk/gcc/toplev.c:325
0xee3825 gimple_code
        ../../gcc-source-trunk/gcc/gimple.h:1677
0xee3825 is_gimple_call
        ../../gcc-source-trunk/gcc/gimple.h:2788
0xee3825 convert_control_dep_chain_into_preds
        ../../gcc-source-trunk/gcc/tree-ssa-uninit.c:676
0xeeb454 convert_control_dep_chain_into_preds
        ../../gcc-source-trunk/gcc/vec.h:826
0xeeb454 find_predicates
        ../../gcc-source-trunk/gcc/tree-ssa-uninit.c:797
0xeeb454 is_use_properly_guarded
        ../../gcc-source-trunk/gcc/tree-ssa-uninit.c:2444
0xeec848 find_uninit_use
        ../../gcc-source-trunk/gcc/tree-ssa-uninit.c:2531
0xeec848 warn_uninitialized_phi
        ../../gcc-source-trunk/gcc/tree-ssa-uninit.c:2601
0xeec848 execute
        ../../gcc-source-trunk/gcc/tree-ssa-uninit.c:2709
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
$


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


int printf (const char *, ...);

int a, b, d;
static int c, e, f, g;

int main ()
{ 
  int h = 0, i;
  if (b)
    { 
      d = f;
      if (c)
        goto L1;
      goto L2;
    }
  for (; h < 2; h++)
    { 
      int l, m = 0;
      for (; e < 2; e++)
        { 
          m = ~m;
        L1:;
        }
    L2:
      while (l)
        for (i = 0; i < 2; i++)
          for (g = 0; g < 1; g++)
            if (m)
              printf ("%d", a);
    }
  return 0;
}