[Bug c++/103704] New: [12 Regression] ICE: tree check: expected class 'type', have 'exceptional' (tree_vec) in operand_equal_p, at fold-const.c:3011

[asolokha at gmx dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103704

            Bug ID: 103704
           Summary: [12 Regression] ICE: tree check: expected class
                    'type', have 'exceptional' (tree_vec) in
                    operand_equal_p, at fold-const.c:3011
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code, openmp
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: asolokha at gmx dot com
  Target Milestone: ---

g++ 12.0.0 20211212 snapshot (g:0b52083ea2c2dd9897031fdc3802a68fd4aa45ef) ICEs
when compiling the following testcase, reduced from
test/OpenMP/distribute_ast_print.cpp from the clang 13.0.0 test suite, w/
-fopenmp:

struct S {
  int a;
  typedef int type;
};

template <typename T>
class S7 : public T {
protected:
  T a;

public:
  S7() {
#pragma omp target
#pragma omp teams
#pragma omp distribute private(a)
    for (int k = 0; k < 1; ++k)
      ;
  }
};

struct S8 : public S7<S> {
  S8() : S7<S>() {}
};

% g++-12.0.0 -fopenmp -c wrzv9p97.cpp
wrzv9p97.cpp: In instantiation of 'S7<T>::S7(typename T::type) [with T = S;
typename T::type = int]':
wrzv9p97.cpp:22:22:   required from here
wrzv9p97.cpp:13:9: internal compiler error: tree check: expected class 'type',
have 'exceptional' (tree_vec) in operand_equal_p, at fold-const.c:3011
   13 | #pragma omp target
      |         ^~~
0x867963 tree_class_check_failed(tree_node const*, tree_code_class, char
const*, int, char const*)
       
/var/tmp/portage/sys-devel/gcc-12.0.0_p20211212/work/gcc-12-20211212/gcc/tree.c:8752
0x78ad2a tree_class_check(tree_node*, tree_code_class, char const*, int, char
const*)
       
/var/tmp/portage/sys-devel/gcc-12.0.0_p20211212/work/gcc-12-20211212/gcc/tree.h:3564
0x78ad2a operand_compare::operand_equal_p(tree_node const*, tree_node const*,
unsigned int)
       
/var/tmp/portage/sys-devel/gcc-12.0.0_p20211212/work/gcc-12-20211212/gcc/fold-const.c:3011
0xe00d30 operand_compare::operand_equal_p(tree_node const*, tree_node const*,
unsigned int)
       
/var/tmp/portage/sys-devel/gcc-12.0.0_p20211212/work/gcc-12-20211212/gcc/fold-const.c:3970
0xe00d30 operand_compare::verify_hash_value(tree_node const*, tree_node const*,
unsigned int, bool*)
       
/var/tmp/portage/sys-devel/gcc-12.0.0_p20211212/work/gcc-12-20211212/gcc/fold-const.c:3956
0xe00d30 operand_compare::verify_hash_value(tree_node const*, tree_node const*,
unsigned int, bool*)
       
/var/tmp/portage/sys-devel/gcc-12.0.0_p20211212/work/gcc-12-20211212/gcc/fold-const.c:3948
0xe016d8 operand_compare::operand_equal_p(tree_node const*, tree_node const*,
unsigned int)
       
/var/tmp/portage/sys-devel/gcc-12.0.0_p20211212/work/gcc-12-20211212/gcc/fold-const.c:2965
0xe016d8 operand_equal_p(tree_node const*, tree_node const*, unsigned int)
       
/var/tmp/portage/sys-devel/gcc-12.0.0_p20211212/work/gcc-12-20211212/gcc/fold-const.c:3987
0xb89dee finish_omp_target_clauses_r
       
/var/tmp/portage/sys-devel/gcc-12.0.0_p20211212/work/gcc-12-20211212/gcc/cp/semantics.c:9332
0x14820e2 walk_tree_1(tree_node**, tree_node* (*)(tree_node**, int*, void*),
void*, hash_set<tree_node*, false, default_hash_traits<tree_node*> >*,
tree_node* (*)(tree_node**, int*, tree_node* (*)(tree_node**, int*, void*),
void*, hash_set<tree_node*, false, default_hash_traits<tree_node*> >*))
       
/var/tmp/portage/sys-devel/gcc-12.0.0_p20211212/work/gcc-12-20211212/gcc/tree.c:11084
0x14822fd walk_tree_1(tree_node**, tree_node* (*)(tree_node**, int*, void*),
void*, hash_set<tree_node*, false, default_hash_traits<tree_node*> >*,
tree_node* (*)(tree_node**, int*, tree_node* (*)(tree_node**, int*, void*),
void*, hash_set<tree_node*, false, default_hash_traits<tree_node*> >*))
       
/var/tmp/portage/sys-devel/gcc-12.0.0_p20211212/work/gcc-12-20211212/gcc/tree.c:11315
0x14823ce walk_tree_1(tree_node**, tree_node* (*)(tree_node**, int*, void*),
void*, hash_set<tree_node*, false, default_hash_traits<tree_node*> >*,
tree_node* (*)(tree_node**, int*, tree_node* (*)(tree_node**, int*, void*),
void*, hash_set<tree_node*, false, default_hash_traits<tree_node*> >*))
       
/var/tmp/portage/sys-devel/gcc-12.0.0_p20211212/work/gcc-12-20211212/gcc/tree.c:11199
0x14822fd walk_tree_1(tree_node**, tree_node* (*)(tree_node**, int*, void*),
void*, hash_set<tree_node*, false, default_hash_traits<tree_node*> >*,
tree_node* (*)(tree_node**, int*, tree_node* (*)(tree_node**, int*, void*),
void*, hash_set<tree_node*, false, default_hash_traits<tree_node*> >*))
       
/var/tmp/portage/sys-devel/gcc-12.0.0_p20211212/work/gcc-12-20211212/gcc/tree.c:11315
0x14855ea walk_tree_without_duplicates_1(tree_node**, tree_node*
(*)(tree_node**, int*, void*), void*, tree_node* (*)(tree_node**, int*,
tree_node* (*)(tree_node**, int*, void*), void*, hash_set<tree_node*, false,
default_hash_traits<tree_node*> >*))
       
/var/tmp/portage/sys-devel/gcc-12.0.0_p20211212/work/gcc-12-20211212/gcc/tree.c:11341
0xb78ef5 finish_omp_target_clauses(unsigned int, tree_node*, tree_node**)
       
/var/tmp/portage/sys-devel/gcc-12.0.0_p20211212/work/gcc-12-20211212/gcc/cp/semantics.c:9431
0xb2e5a8 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
       
/var/tmp/portage/sys-devel/gcc-12.0.0_p20211212/work/gcc-12-20211212/gcc/cp/pt.c:18980
0xb2bd7b tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
       
/var/tmp/portage/sys-devel/gcc-12.0.0_p20211212/work/gcc-12-20211212/gcc/cp/pt.c:18582
0xb2c18a tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
       
/var/tmp/portage/sys-devel/gcc-12.0.0_p20211212/work/gcc-12-20211212/gcc/cp/pt.c:18211
0xb2c18a tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
       
/var/tmp/portage/sys-devel/gcc-12.0.0_p20211212/work/gcc-12-20211212/gcc/cp/pt.c:18225
0xb2bd7b tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
       
/var/tmp/portage/sys-devel/gcc-12.0.0_p20211212/work/gcc-12-20211212/gcc/cp/pt.c:18582