[Bug c/106126] New: tree check fail in useless_type_conversion_p, at gimple-expr.cc:87

["dcb314 at hotmail dot com" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106126

            Bug ID: 106126
           Summary: tree check fail in useless_type_conversion_p, at
                    gimple-expr.cc:87
           Product: gcc
           Version: 12.0
            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 53218
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=53218&action=edit
C source code

For the attached C code, with recent gcc trunk and compiler flag -O2, I get

$ ../results/bin/gcc -c -O2 bug822.c
during GIMPLE pass: iftoswitch
/home/dcb36/rpmbuild/BUILD/libsolv-0.7.20/src/conda.c: In function
‘pool_conda_matchspec’:
/home/dcb36/rpmbuild/BUILD/libsolv-0.7.20/src/conda.c:679:1: internal compiler
error: tree check: expected class ‘type’, have ‘exceptional’ (error_mark) in
useless_type_conversion_p, at gimple-expr.cc:87
  679 | }
      | ^
0x10fcfba tree_class_check_failed(tree_node const*, tree_code_class, char
const*, int, char const*)
        ../../trunk.git/gcc/tree.cc:8866
0x9ffd8c tree_class_check(tree_node*, tree_code_class, char const*, int, char
const*)
        ../../trunk.git/gcc/tree.h:3639
0x9ffd8c useless_type_conversion_p(tree_node*, tree_node*)
        ../../trunk.git/gcc/gimple-expr.cc:87

I will have my usual go at identifying a git hash range and reducing the code.