[Bug rtl-optimization/82290] New: ICE at -O2 on x86_64-linux-gnu: verify_flow_info failed

[su at cs dot ucdavis.edu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82290

            Bug ID: 82290
           Summary: ICE at -O2 on x86_64-linux-gnu: verify_flow_info
                    failed
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: su at cs dot ucdavis.edu
  Target Milestone: ---

$ 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 20170921 (experimental) [trunk revision 253084] (GCC)
$
$ gcctk -Os -c small.c
$
$ gcctk -O2 -c small.c
small.c: In function ‘fn1’:
small.c:35:1: error: non-cold basic block 6 reachable only by paths crossing
the cold partition
 }
 ^
during RTL pass: bbro
small.c:35:1: internal compiler error: verify_flow_info failed
0x7f12ce verify_flow_info()
        ../../gcc-source-trunk/gcc/cfghooks.c:259
0x8080d4 checking_verify_flow_info
        ../../gcc-source-trunk/gcc/cfghooks.h:198
0x8080d4 cfg_layout_finalize()
        ../../gcc-source-trunk/gcc/cfgrtl.c:4314
0x13552f9 execute
        ../../gcc-source-trunk/gcc/bb-reorder.c:2601
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 *, ...);

struct
{ 
  int a:2;
} b;

int c, e, h, i;
unsigned j;
long d, g;
volatile int f;

void fn1 ()
{ 
  while (1)
    while (1)
      { 
        if (h)
          break;
        int l;
        if (i)
          {
          L:
            j = b.a;
            g = (g ^ (f && e)) / (c && b.a / (j && d));
            e = (g && b.a) & (j || f);
            if (!l)
              { 
                printf ("%ld\n", g);
                goto L;
              }
          }
        b.a = j;
      }
}