[Bug c/94730] New: [10 Regression] internal compiler error: in fold_convert_loc, at fold-const.c:2435

["anbu1024.me at gmail dot com" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94730

            Bug ID: 94730
           Summary: [10 Regression] internal compiler error: in
                    fold_convert_loc, at fold-const.c:2435
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: anbu1024.me at gmail dot com
  Target Milestone: ---

$ cat reduced.c 

int x , y ; 

int foo ( ) 
{ 
        x = 0 ; 
        y = 0 ; 

        if (x != 0) 
                y ++; 
        else 
                x ++ ; 

} 

int x [] = { 0 } ;

--------------------------------------------------------------------------------

$ gcc-10 --version
gcc (GCC) 10.0.1 20200419 (experimental)
Copyright (C) 2020 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

--------------------------------------------------------------------------------

$ gcc-10 reduced.c 
reduced.c:16:5: error: conflicting types for ‘x’
   16 | int x [] = { 0 } ;
      |     ^
reduced.c:2:5: note: previous declaration of ‘x’ was here
    2 | int x , y ;
      |     ^
reduced.c: In function ‘foo’:
reduced.c:12:5: internal compiler error: in fold_convert_loc, at
fold-const.c:2435
   12 |   x ++ ;
      |   ~~^~
0x65b582 fold_convert_loc(unsigned int, tree_node*, tree_node*)
        ../../gcc-10-20200419/gcc/fold-const.c:2435
0xb12707 gimplify_self_mod_expr(tree_node**, gimple**, gimple**, bool,
tree_node*)
        ../../gcc-10-20200419/gcc/gimplify.c:3186
0xafd218 gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
        ../../gcc-10-20200419/gcc/gimplify.c:13538
0xb00bd6 gimplify_stmt(tree_node**, gimple**)
        ../../gcc-10-20200419/gcc/gimplify.c:6825
0xb133cc gimplify_cond_expr
        ../../gcc-10-20200419/gcc/gimplify.c:4269
0xafdafe gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
        ../../gcc-10-20200419/gcc/gimplify.c:13565
0xb00bd6 gimplify_stmt(tree_node**, gimple**)
        ../../gcc-10-20200419/gcc/gimplify.c:6825
0xafe48b gimplify_statement_list
        ../../gcc-10-20200419/gcc/gimplify.c:1869
0xafe48b gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
        ../../gcc-10-20200419/gcc/gimplify.c:14052
0xb00bd6 gimplify_stmt(tree_node**, gimple**)
        ../../gcc-10-20200419/gcc/gimplify.c:6825
0xb0199b gimplify_bind_expr
        ../../gcc-10-20200419/gcc/gimplify.c:1424
0xafe0b3 gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
        ../../gcc-10-20200419/gcc/gimplify.c:13809
0xb15927 gimplify_stmt(tree_node**, gimple**)
        ../../gcc-10-20200419/gcc/gimplify.c:6825
0xb15927 gimplify_body(tree_node*, bool)
        ../../gcc-10-20200419/gcc/gimplify.c:14857
0xb15e53 gimplify_function_tree(tree_node*)
        ../../gcc-10-20200419/gcc/gimplify.c:15030
0x9607d7 cgraph_node::analyze()
        ../../gcc-10-20200419/gcc/cgraphunit.c:670
0x9633f7 analyze_functions
        ../../gcc-10-20200419/gcc/cgraphunit.c:1227
0x963fc2 symbol_table::finalize_compilation_unit()
        ../../gcc-10-20200419/gcc/cgraphunit.c:2974
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.

--------------------------------------------------------------------------------

$ gcc-9 --version
gcc (GCC) 9.2.1 20191102
Copyright (C) 2019 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

--------------------------------------------------------------------------------

$ gcc-9 reduced.c 
reduced.c:16:5: error: conflicting types for ‘x’
   16 | int x [] = { 0 } ;
      |     ^
reduced.c:2:5: note: previous declaration of ‘x’ was here
    2 | int x , y ;
      |     ^
reduced.c:12: confused by earlier errors, bailing out