(fill_simple_delay_slots): When filling an insn's delay slot with a JUMP_INSN...

(fill_simple_delay_slots): When filling an insn's delay slot with a
JUMP_INSN, don't assume the JUMP_INSN immediately follows the insn on
the unfilled slots obstack.

From-SVN: r10362

diff --git a/gcc/reorg.c b/gcc/reorg.c
index 00e860ce087765a8f63fe11686c57d5ace6d706a..edd76d5d21be90313eb1e1092e7627acb5a507a6 100644 (file)
--- a/gcc/reorg.c
+++ b/gcc/reorg.c
@@ -2857,12 +2857,24 @@ fill_simple_delay_slots (first, non_jumps_p)
          && eligible_for_delay (insn, slots_filled, trial, flags)
          && no_labels_between_p (insn, trial))
        {
+         rtx *tmp;
          slots_filled++;
          delay_list = add_to_delay_list (trial, delay_list);
+
+         /* TRIAL may have had its delay slot filled, then unfilled.  When
+            the delay slot is unfilled, TRIAL is placed back on the unfilled
+            slots obstack.  Unfortunately, it is placed on the end of the
+            obstack, not in its original location.  Therefore, we must search
+            from entry i + 1 to the end of the unfilled slots obstack to
+            try and find TRIAL.  */
+         tmp = &unfilled_slots_base[i + 1];
+         while (*tmp != trial && tmp != unfilled_slots_next)
+           tmp++;
+
          /* Remove the unconditional jump from consideration for delay slot
-            filling and unthread it.  */
-         if (unfilled_slots_base[i + 1] == trial)
-           unfilled_slots_base[i + 1] = 0;
+            filling and unthread it.   */
+         if (*tmp == trial)
+           *tmp = 0;
          {
            rtx next = NEXT_INSN (trial);
            rtx prev = PREV_INSN (trial);