[Bug rtl-optimization/100590] New: ICE: verify_flow_info failed (error: too many outgoing branch edges from bb 2)

[asolokha at gmx dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100590

            Bug ID: 100590
           Summary: ICE: verify_flow_info failed (error: too many outgoing
                    branch edges from bb 2)
           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-12.0.0-alpha20210509 snapshot (g:5e0236d3b0e0d7ad98bcee36128433fa755b5558)
and gcc 11.1 ICE when compiling testsuite/gcc.dg/torture/pr100398.c w/ -O1
-fno-dce:

% gcc-12.0.0 -O1 -fno-dce -c gcc/testsuite/gcc.dg/torture/pr100398.c
gcc/testsuite/gcc.dg/torture/pr100398.c: In function 'test5_limit':
gcc/testsuite/gcc.dg/torture/pr100398.c:13:1: error: too many outgoing branch
edges from bb 2
   13 | }
      | ^
during RTL pass: cprop_hardreg
gcc/testsuite/gcc.dg/torture/pr100398.c:13:1: internal compiler error:
verify_flow_info failed
0x9706d3 verify_flow_info()
       
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20210509/work/gcc-12-20210509/gcc/cfghooks.c:269
0xd2d29a execute_function_todo
       
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20210509/work/gcc-12-20210509/gcc/passes.c:2054
0xd2dc8b execute_todo
       
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20210509/work/gcc-12-20210509/gcc/passes.c:2096

It can be a duplicate of PR98619.