[Bug fortran/95338] New: [9/10/11 Regression] ICE in eliminate_stmt, at tree-ssa-sccvn.c:5974

[gscfq@t-online.de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95338

            Bug ID: 95338
           Summary: [9/10/11 Regression] ICE in eliminate_stmt, at
                    tree-ssa-sccvn.c:5974
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gscfq@t-online.de
  Target Milestone: ---

Changed between 20181202 and 20181209, with option -O1 :


$ cat z1.f90
module m
contains
   function f(x)
      integer :: x
      integer :: f
      real :: g
      f = x
      return
   entry g(x)
      g = x
   end
end
program p
   use m
   print *, f(1)
   print *, g(1)
end


$ gfortran-11-20200524 -c z1.f90 -O2 -ff2c
$
$ gfortran-11-20200524 -c z1.f90 -O1 -ff2c
during GIMPLE pass: fre
z1.f90:6:0:

    6 |       real :: g
      |
internal compiler error: in eliminate_stmt, at tree-ssa-sccvn.c:5974
0xd40f45 eliminate_dom_walker::eliminate_stmt(basic_block_def*,
gimple_stmt_iterator*)
        ../../gcc/tree-ssa-sccvn.c:5974
0xd45a90 process_bb
        ../../gcc/tree-ssa-sccvn.c:7173
0xd46fe1 do_rpo_vn
        ../../gcc/tree-ssa-sccvn.c:7657
0xd47f8a execute
        ../../gcc/tree-ssa-sccvn.c:7811



Configured with --enable-checking=yes :

$ gfortran-11-20200524 -c z1.f90 -O1 -ff2c
z1.f90:6:0:

    6 |       real :: g
      |
Error: non-trivial conversion in 'component_ref'
real(kind=8)
real(kind=4)
D.3943 = __result.g;
z1.f90:6:0: internal compiler error: 'verify_gimple' failed
0xd9b27d verify_gimple_in_seq(gimple*)
        ../../gcc/tree-cfg.c:5113
0xa526b1 gimplify_body(tree_node*, bool)
        ../../gcc/gimplify.c:14919
0xa52967 gimplify_function_tree(tree_node*)
        ../../gcc/gimplify.c:14990
0x88d9e7 cgraph_node::analyze()
        ../../gcc/cgraphunit.c:671
0x890e21 analyze_functions
        ../../gcc/cgraphunit.c:1231
0x892042 symbol_table::finalize_compilation_unit()
        ../../gcc/cgraphunit.c:2975