https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106911

            Bug ID: 106911
           Summary: ICE in gfc_convert_mpz_to_signed, at
                    fortran/simplify.cc:193
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gs...@t-online.de
  Target Milestone: ---

Affects versions down to at least r5 :


$ cat z1.f90
program p
   integer, parameter :: a = 10
   integer, parameter :: b = 20
   interface
      subroutine s
         integer, parameter :: c = ishftc(1_1, a, b)
      end
   end interface
end


$ gfortran-13-20220911 -c z1.f90
f951: internal compiler error: in gfc_convert_mpz_to_signed, at
fortran/simplify.cc:193
0x8846e1 gfc_convert_mpz_to_signed(__mpz_struct*, int)
        ../../gcc/fortran/simplify.cc:193
0x88a75a gfc_simplify_ishftc(gfc_expr*, gfc_expr*, gfc_expr*)
        ../../gcc/fortran/simplify.cc:4031
0x808f4a do_simplify
        ../../gcc/fortran/intrinsic.cc:4677
0x813dc8 gfc_intrinsic_func_interface(gfc_expr*, int)
        ../../gcc/fortran/intrinsic.cc:4942
0x7f9c2c gfc_simplify_expr(gfc_expr*, int)
        ../../gcc/fortran/expr.cc:2228
0x813f7e gfc_intrinsic_func_interface(gfc_expr*, int)
        ../../gcc/fortran/intrinsic.cc:5092
0x869578 resolve_unknown_f
        ../../gcc/fortran/resolve.cc:2990
0x869578 resolve_function
        ../../gcc/fortran/resolve.cc:3347
0x869578 gfc_resolve_expr(gfc_expr*)
        ../../gcc/fortran/resolve.cc:7194
0x7f8e04 gfc_reduce_init_expr(gfc_expr*)
        ../../gcc/fortran/expr.cc:3163
0x7fbd90 gfc_match_init_expr(gfc_expr**)
        ../../gcc/fortran/expr.cc:3211
0x7e5d2b variable_decl
        ../../gcc/fortran/decl.cc:3028
0x7e5d2b gfc_match_data_decl()
        ../../gcc/fortran/decl.cc:6331
0x8519c3 match_word
        ../../gcc/fortran/parse.cc:67
0x8519c3 decode_statement
        ../../gcc/fortran/parse.cc:378
0x85340a next_free
        ../../gcc/fortran/parse.cc:1399
0x85340a next_statement
        ../../gcc/fortran/parse.cc:1631
0x8556f4 parse_spec
        ../../gcc/fortran/parse.cc:3986
0x8550ae parse_interface
        ../../gcc/fortran/parse.cc:3849
0x8550ae parse_spec
        ../../gcc/fortran/parse.cc:4123

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