- rtx insn, next;
- rtx bb_note = NULL_RTX;
- rtx head = NULL_RTX;
- rtx end = NULL_RTX;
- basic_block prev = ENTRY_BLOCK_PTR;
-
- /* We process the instructions in a slightly different way than we did
- previously. This is so that we see a NOTE_BASIC_BLOCK after we have
- closed out the previous block, so that it gets attached at the proper
- place. Since this form should be equivalent to the previous,
- count_basic_blocks continues to use the old form as a check. */
-
- for (insn = f; insn; insn = next)
- {
- enum rtx_code code = GET_CODE (insn);
-
- next = NEXT_INSN (insn);
-
- if ((LABEL_P (insn) || BARRIER_P (insn))
- && head)
- {
- prev = create_basic_block_structure (head, end, bb_note, prev);
- head = end = NULL_RTX;
- bb_note = NULL_RTX;
- }
-
- if (inside_basic_block_p (insn))
- {
- if (head == NULL_RTX)
- head = insn;
- end = insn;
- }
-
- if (head && control_flow_insn_p (insn))
- {
- prev = create_basic_block_structure (head, end, bb_note, prev);
- head = end = NULL_RTX;
- bb_note = NULL_RTX;
- }
-
- switch (code)
- {
- case NOTE:
- {
- int kind = NOTE_LINE_NUMBER (insn);
-
- /* Look for basic block notes with which to keep the
- basic_block_info pointers stable. Unthread the note now;
- we'll put it back at the right place in create_basic_block.
- Or not at all if we've already found a note in this block. */
- if (kind == NOTE_INSN_BASIC_BLOCK)
- {
- if (bb_note == NULL_RTX)
- bb_note = insn;
- else
- next = delete_insn (insn);
- }
- break;
- }
-
- case CODE_LABEL:
- case JUMP_INSN:
- case CALL_INSN:
- case INSN:
- case BARRIER:
- break;
-
- default:
- abort ();
- }
- }
-
- if (head != NULL_RTX)
- create_basic_block_structure (head, end, bb_note, prev);
- else if (bb_note)
- delete_insn (bb_note);
-
- if (last_basic_block != n_basic_blocks)
- abort ();