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Subject: [Bug fortran/103392] New: [9/10/11/12 Regression] ICE in
 simplify_bound, at fortran/simplify.c:4273
Date: Tue, 23 Nov 2021 19:00:28 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103392

            Bug ID: 103392
           Summary: [9/10/11/12 Regression] ICE in simplify_bound, at
                    fortran/simplify.c:4273
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gscfq@t-online.de
  Target Milestone: ---

Started with r6 :


$ cat z1.f90
program p
   integer, allocatable :: a(1:1)
   integer :: b(1) =3D lbound(a)
   integer :: c(1) =3D ubound(a)
end


$ gfortran-5 -c z1.f90
z1.f90:2:33:

    integer, allocatable :: a(1:1)
                                 1
Error: Allocatable array 'a' at (1) must have a deferred shape or assumed r=
ank


$ gfortran-12-20211121 -c z1.f90
f951: internal compiler error: in simplify_bound, at fortran/simplify.c:4273
0x824e69 simplify_bound
        ../../gcc/fortran/simplify.c:4269
0x7ac9da do_simplify
        ../../gcc/fortran/intrinsic.c:4655
0x7b7a7a gfc_intrinsic_func_interface(gfc_expr*, int)
        ../../gcc/fortran/intrinsic.c:5034
0x80b71c resolve_unknown_f
        ../../gcc/fortran/resolve.c:2972
0x80b71c resolve_function
        ../../gcc/fortran/resolve.c:3329
0x80b71c gfc_resolve_expr(gfc_expr*)
        ../../gcc/fortran/resolve.c:7166
0x79cac4 gfc_reduce_init_expr(gfc_expr*)
        ../../gcc/fortran/expr.c:3130
0x79f990 gfc_match_init_expr(gfc_expr**)
        ../../gcc/fortran/expr.c:3178
0x789f44 variable_decl
        ../../gcc/fortran/decl.c:3004
0x789f44 gfc_match_data_decl()
        ../../gcc/fortran/decl.c:6297
0x7f3df3 match_word
        ../../gcc/fortran/parse.c:67
0x7f3df3 decode_statement
        ../../gcc/fortran/parse.c:378
0x7f583a next_free
        ../../gcc/fortran/parse.c:1397
0x7f583a next_statement
        ../../gcc/fortran/parse.c:1629
0x7f6f5b parse_spec
        ../../gcc/fortran/parse.c:4168
0x7fa2bc parse_progunit
        ../../gcc/fortran/parse.c:6179
0x7fb5a1 gfc_parse_file()
        ../../gcc/fortran/parse.c:6724
0x848a6f gfc_be_parse_file
        ../../gcc/fortran/f95-lang.c:216=