[Bug c/103194] New: ice in optimize_atomic_bit_test_and, at tree-ssa-ccp.c:3626

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103194

            Bug ID: 103194
           Summary: ice in optimize_atomic_bit_test_and, at
                    tree-ssa-ccp.c:3626
           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: ---

For this C code:

long pscc_a_2_3;
int pscc_a_1_4;
void pscc()
{
        pscc_a_1_4 = __sync_fetch_and_and(&pscc_a_2_3, 1);
}

compiled by recent gcc trunk, does this:

$ /home/dcb/gcc/results/bin/gcc -c -O1 bug771.c
during GIMPLE pass: fab
bug771.c: In function ‘pscc’:
bug771.c:3:6: internal compiler error: in optimize_atomic_bit_test_and, at
tree-ssa-ccp.c:3626
    3 | void pscc()
      |      ^~~~
0xee6020 optimize_atomic_bit_test_and(gimple_stmt_iterator*, internal_fn, bool,
bool)
        ../../trunk.git/gcc/tree-ssa-ccp.c:3626
0xee389a (anonymous namespace)::pass_fold_builtins::execute(function*)
        ../../trunk.git/gcc/tree-ssa-ccp.c:0

The bug first seems to occur sometime between git hash f2572a398d21fd52
and a97fdde627e64202,a distance of some 60 commits.

In that range, commit fb161782545224f55ba26ba663889c5e6e9a04d1
looks a likely candidate.