$ gcc-trunk -v
Using built-in specs.
COLLECT_GCC=gcc-trunk
COLLECT_LTO_WRAPPER=/usr/local/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=/usr/local/gcc-trunk --disable-bootstrap
Thread model: posix
gcc version 8.0.0 20170810 (experimental) [trunk revision 251019] (GCC)
$
$ gcc-trunk -O2 -c small.c
$
$ gcc-trunk -O3 -c small.c
small.c: In function ‘fn1’:
small.c:5:6: error: invalid argument to gimple call
 void fn1 (int h)
      ^~~
&e > 3B
_33 = LOOP_DIST_ALIAS (4, &e > 3B);
during GIMPLE pass: ldist
small.c:5:6: internal compiler error: verify_gimple failed
0xcb091b verify_gimple_in_cfg(function*, bool)
        ../../gcc-source-trunk/gcc/tree-cfg.c:5310
0xb75202 execute_function_todo
        ../../gcc-source-trunk/gcc/passes.c:1992
0xb75ba9 execute_todo
        ../../gcc-source-trunk/gcc/passes.c:2046
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, c[1], d, e, **f;

void fn1 (int h)
{ 
  int *i = 0;
  for (d = 0; d < 1; d++)
    { 
      if (d)
        continue;
      for (; e; e++)
        { 
          a = c[*i];
          if (h)
            printf ("0");
        }
      return;
    }
  f = &i;
}