* sel-sched-ir.c (get_seqno_by_preds): Allow returning negative
seqno. Adjust comment.
* sel-sched.c (find_seqno_for_bookkeeping): Assert that when
inserting bookkeeping before a jump, the jump is not scheduled.
When no positive seqno found, provide a value. Add comment.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@147977
138bc75d-0d04-0410-961f-
82ee72b054a4
+2009-05-29 Andrey Belevantsev <abel@ispras.ru>
+
+ PR rtl-optimization/40101
+ * sel-sched-ir.c (get_seqno_by_preds): Allow returning negative
+ seqno. Adjust comment.
+ * sel-sched.c (find_seqno_for_bookkeeping): Assert that when
+ inserting bookkeeping before a jump, the jump is not scheduled.
+ When no positive seqno found, provide a value. Add comment.
+
2009-05-29 Richard Guenther <rguenther@suse.de>
* tree-ssa-alias.c (nonaliasing_component_refs_p): Remove
return seqno;
}
-/* Find the proper seqno for inserting at INSN. */
+/* Find the proper seqno for inserting at INSN. Returns -1 if no predecessors
+ with positive seqno exist. */
int
get_seqno_by_preds (rtx insn)
{
for (i = 0, seqno = -1; i < n; i++)
seqno = MAX (seqno, INSN_SEQNO (preds[i]));
- gcc_assert (seqno > 0);
return seqno;
}
if (INSN_P (next)
&& JUMP_P (next)
&& BLOCK_FOR_INSN (next) == BLOCK_FOR_INSN (place_to_insert))
- seqno = INSN_SEQNO (next);
+ {
+ gcc_assert (INSN_SCHED_TIMES (next) == 0);
+ seqno = INSN_SEQNO (next);
+ }
else if (INSN_SEQNO (join_point) > 0)
seqno = INSN_SEQNO (join_point);
else
- seqno = get_seqno_by_preds (place_to_insert);
+ {
+ seqno = get_seqno_by_preds (place_to_insert);
+
+ /* Sometimes the fences can move in such a way that there will be
+ no instructions with positive seqno around this bookkeeping.
+ This means that there will be no way to get to it by a regular
+ fence movement. Never mind because we pick up such pieces for
+ rescheduling anyways, so any positive value will do for now. */
+ if (seqno < 0)
+ {
+ gcc_assert (pipelining_p);
+ seqno = 1;
+ }
+ }
gcc_assert (seqno > 0);
return seqno;