[Bug rtl-optimization/105455] New: ICE: verify_flow_info failed (error: verify_flow_info: REG_BR_PROB does not match cfg)

[asolokha at gmx dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105455

            Bug ID: 105455
           Summary: ICE: verify_flow_info failed (error: verify_flow_info:
                    REG_BR_PROB does not match cfg)
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: asolokha at gmx dot com
  Target Milestone: ---

gcc 12.0.1 20220424 snapshot (g:6b7441a46c771aa6ecdc0c8ed96197417d036b9a) ICEs
when compiling the following testcase w/ -O1 -fharden-conditional-branches
-funroll-loops --param max-loop-header-insns=1:

__attribute__ ((cold)) void
bar (void);

void
foo (int x)
{
  if (x)
    {
      int i;

      for (i = 0; i < 101; ++i)
        bar ();
    }
}

% gcc-12.0.1 -O1 -fharden-conditional-branches -funroll-loops --param
max-loop-header-insns=1 -c hkihrvjs.c
hkihrvjs.c: In function 'foo':
hkihrvjs.c:14:1: error: verify_flow_info: REG_BR_PROB does not match cfg
1073741831 7
   14 | }
      | ^
during RTL pass: loop2_unroll
hkihrvjs.c:14:1: internal compiler error: verify_flow_info failed
0x9df59e verify_flow_info()
       
/var/tmp/portage/sys-devel/gcc-12.0.1_p20220424/work/gcc-12-20220424/gcc/cfghooks.cc:284
0xde0a8a execute_function_todo
       
/var/tmp/portage/sys-devel/gcc-12.0.1_p20220424/work/gcc-12-20220424/gcc/passes.cc:2097
0xde0f9e execute_todo
       
/var/tmp/portage/sys-devel/gcc-12.0.1_p20220424/work/gcc-12-20220424/gcc/passes.cc:2139