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[Bug fortran/78258] New: ICE in compare_values_warnv, at tree-vrp.c:1218


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78258

            Bug ID: 78258
           Summary: ICE in compare_values_warnv, at tree-vrp.c:1218
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gerhard.steinmetz.fortran@t-online.de
  Target Milestone: ---

Version 7 (configured with --enable-checking=yes) ICEs at -Os,-O2,-O3.


$ cat z1.f90
program p
   implicit none
   call sub (1, 'abcd')
   call sub (2, x4=4, x3='1234567')
contains
   subroutine sub (x1, x2, x3, x4)
      integer, intent(in) :: x1
      character(4), optional :: x2
      character(8), optional :: x3
      integer, optional :: x4
      if ( x1 == 1 ) then
         if ( x2 /= 'abcd' ) call abort
      else
         if ( x3 /= '1234567' ) call abort
         if ( x4 /= 4 ) call abort
      end if
   end
end


$ gfortran-7-20161106 -O2 z1.f90
z1.f90:4:25:

    call sub (2, x4=4, x3='1234567')
                         1
Warning: Character length of actual argument shorter than of dummy argument
'x3' (7/8) at (1) [-Wargument-mismatch]
z1.f90:4:0:

    call sub (2, x4=4, x3='1234567')

internal compiler error: in compare_values_warnv, at tree-vrp.c:1218
0xeb46fa compare_values_warnv
        ../../gcc/tree-vrp.c:1217
0xeb481c compare_values
        ../../gcc/tree-vrp.c:1361
0xeb4f37 set_value_range
        ../../gcc/tree-vrp.c:366
0xeb817b vrp_meet_1
        ../../gcc/tree-vrp.c:8722
0xeb817b vrp_meet(value_range*, value_range const*)
        ../../gcc/tree-vrp.c:8745
0x1326d45 ipcp_vr_lattice::meet_with_1(value_range const*)
        ../../gcc/ipa-cp.c:909
0x1329e40 ipcp_vr_lattice::meet_with(value_range const*)
        ../../gcc/ipa-cp.c:891
0x1329e40 propagate_vr_accross_jump_function
        ../../gcc/ipa-cp.c:1872
0x1329e40 propagate_constants_accross_call
        ../../gcc/ipa-cp.c:2232
0x132d6dc propagate_constants_topo
        ../../gcc/ipa-cp.c:3127
0x132d6dc ipcp_propagate_stage
        ../../gcc/ipa-cp.c:3237
0x132fffd ipcp_driver
        ../../gcc/ipa-cp.c:4967
0x132fffd execute
        ../../gcc/ipa-cp.c:5061

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