[Bug c/92222] New: ice in useless_type_conversion_p, at gimple-expr.c:86

[dcb314 at hotmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92222

            Bug ID: 92222
           Summary: ice in useless_type_conversion_p, at gimple-expr.c:86
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dcb314 at hotmail dot com
  Target Milestone: ---

Created attachment 47110
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47110&action=edit
C source code

The attached C code, when compiled by recent gcc trunk and compiler flag -O3,
does this:

../results.277350/bin/gcc
during GIMPLE pass: slp
main.c: In function ‘disp_binary’:
main.c:234:13: internal compiler error: tree check: expected class ‘type’, have 
‘exceptional’ (error_mark) in useless_type_conversion_p, at gimple-expr.c:86
0x71c6dd tree_class_check_failed(tree_node const*, tree_code_class, char
const*,
 int, char const*)
        ../../trunk/gcc/tree.c:9975
0x626a1b tree_class_check(tree_node*, tree_code_class, char const*, int, char
co
nst*)
        ../../trunk/gcc/tree.h:3390
0x626a1b useless_type_conversion_p(tree_node*, tree_node*)
        ../../trunk/gcc/gimple-expr.c:86
0xea3fe4 verify_gimple_assign_single
        ../../trunk/gcc/tree-cfg.c:4545
0xea3fe4 verify_gimple_assign
        ../../trunk/gcc/tree-cfg.c:4609

The problem seems to start sometime between revision 277300 and 277350.

I will have my usual go at reducing the code.