+2002-06-04 Jeff Law <law@redhat.com.
+ David Edelsohn <edelsohn@gnu.org>
+ Michael Matz <matz@kde.org>
+
+ * sched-int.h (struct deps): New field libcall_block_tail_insn.
+ * sched_deps.c (init_deps): Initialize libcall_block_tail_insn.
+ * sched_deps.c (sched_analyze_insn): If libcall_block_tail_insn
+ is set, then mark the current insn as being part of a libcall
+ scheduling group.
+ (sched_analyze): Set and clear libcall_block_tail_insn appropriately.
+
+ * haifa-sched.c (schedule_block): Do not count USE or CLOBBER
+ insns against the issue rate.
+
Tue Jun 4 19:29:42 CEST 2002 Jan Hubicka <jh@suse.cz>
* cfglayout.c (duplicate_insn_chain): Kill NOTE_INSN_RANGE notes.
CLEAR_REG_SET (reg_pending_clobbers);
CLEAR_REG_SET (reg_pending_sets);
+ /* If we are currently in a libcall scheduling group, then mark the
+ current insn as being in a scheduling group and that it can not
+ be moved into a different basic block. */
+
+ if (deps->libcall_block_tail_insn)
+ {
+ set_sched_group_p (insn);
+ CANT_MOVE (insn) = 1;
+ }
+
/* If a post-call group is still open, see if it should remain so.
This insn must be a simple move of a hard reg to a pseudo or
vice-versa.
for (insn = head;; insn = NEXT_INSN (insn))
{
+ rtx link, end_seq, r0, set, note;
+
if (GET_CODE (insn) == INSN || GET_CODE (insn) == JUMP_INSN)
{
/* Clear out the stale LOG_LINKS from flow. */
if (current_sched_info->use_cselib)
cselib_process_insn (insn);
+
+ /* Now that we have completed handling INSN, check and see if it is
+ a CLOBBER beginning a libcall block. If it is, record the
+ end of the libcall sequence.
+
+ We want to schedule libcall blocks as a unit before reload. While
+ this restricts scheduling, it preserves the meaning of a libcall
+ block.
+
+ As a side effect, we may get better code due to decreased register
+ pressure as well as less chance of a foreign insn appearing in
+ a libcall block. */
+ if (!reload_completed
+ /* Note we may have nested libcall sequences. We only care about
+ the outermost libcall sequence. */
+ && deps->libcall_block_tail_insn == 0
+ /* The sequence must start with a clobber of a register. */
+ && GET_CODE (insn) == INSN
+ && GET_CODE (PATTERN (insn)) == CLOBBER
+ && (r0 = XEXP (PATTERN (insn), 0), GET_CODE (r0) == REG)
+ && GET_CODE (XEXP (PATTERN (insn), 0)) == REG
+ /* The CLOBBER must also have a REG_LIBCALL note attached. */
+ && (link = find_reg_note (insn, REG_LIBCALL, NULL_RTX)) != 0
+ && (end_seq = XEXP (link, 0)) != 0
+ /* The insn referenced by the REG_LIBCALL note must be a
+ simple nop copy with the same destination as the register
+ mentioned in the clobber. */
+ && (set = single_set (end_seq)) != 0
+ && SET_DEST (set) == r0 && SET_SRC (set) == r0
+ /* And finally the insn referenced by the REG_LIBCALL must
+ also contain a REG_EQUAL note and a REG_RETVAL note. */
+ && find_reg_note (end_seq, REG_EQUAL, NULL_RTX) != 0
+ && find_reg_note (end_seq, REG_RETVAL, NULL_RTX) != 0)
+ deps->libcall_block_tail_insn = XEXP (link, 0);
+
+ /* If we have reached the end of a libcall block, then close the
+ block. */
+ if (deps->libcall_block_tail_insn == insn)
+ deps->libcall_block_tail_insn = 0;
+
if (insn == tail)
{
if (current_sched_info->use_cselib)
deps->last_function_call = 0;
deps->sched_before_next_call = 0;
deps->in_post_call_group_p = false;
+ deps->libcall_block_tail_insn = 0;
}
/* Free insn lists found in DEPS. */