- fallthru = split_block (bb, PREV_INSN (insn));
- BB_END (bb) = flow_transfer_insn;
-
- /* Clean up the bb field for the insns between the blocks. */
- for (x = NEXT_INSN (flow_transfer_insn);
- x != BB_HEAD (fallthru->dest);
- x = NEXT_INSN (x))
- if (!BARRIER_P (x))
- set_block_for_insn (x, NULL);
-
- bb = fallthru->dest;
- remove_edge (fallthru);
- flow_transfer_insn = NULL_RTX;
+ /* __builtin_unreachable () may cause a barrier to be emitted in
+ the middle of a BB. We need to split it in the same manner as
+ if the barrier were preceded by a control_flow_insn_p insn. */
+ if (!flow_transfer_insn)
+ flow_transfer_insn = prev_nonnote_insn_bb (insn);