[PATCH 13/18] haifa-sched.c: make twins a auto_vec<rtx_insn *>

[tbsaunde+gcc at tbsaunde dot org]

From: Trevor Saunders <tbsaunde+gcc@tbsaunde.org>

gcc/ChangeLog:

2016-04-19  Trevor Saunders  <tbsaunde+gcc@tbsaunde.org>

	* haifa-sched.c (add_to_speculative_block): Make twins a vector.
---
 gcc/haifa-sched.c | 25 ++++++++-----------------
 1 file changed, 8 insertions(+), 17 deletions(-)

diff --git a/gcc/haifa-sched.c b/gcc/haifa-sched.c
index 0721ec5..34c5cc5 100644
--- a/gcc/haifa-sched.c
+++ b/gcc/haifa-sched.c
@@ -7973,7 +7973,7 @@ add_to_speculative_block (rtx_insn *insn)
   ds_t ts;
   sd_iterator_def sd_it;
   dep_t dep;
-  rtx_insn_list *twins = NULL;
+  auto_vec<rtx_insn *, 10> twins;
   rtx_vec_t priorities_roots;
 
   ts = TODO_SPEC (insn);
@@ -8043,7 +8043,7 @@ add_to_speculative_block (rtx_insn *insn)
         fprintf (spec_info->dump, ";;\t\tGenerated twin insn : %d/rec%d\n",
                  INSN_UID (twin), rec->index);
 
-      twins = alloc_INSN_LIST (twin, twins);
+      twins.safe_push (twin);
 
       /* Add dependences between TWIN and all appropriate
 	 instructions from REC.  */
@@ -8082,23 +8082,14 @@ add_to_speculative_block (rtx_insn *insn)
 
   /* We couldn't have added the dependencies between INSN and TWINS earlier
      because that would make TWINS appear in the INSN_BACK_DEPS (INSN).  */
-  while (twins)
+  unsigned int len = twins.length ();
+  for (unsigned int i = len - 1; i < len; i--)
     {
-      rtx_insn *twin;
-      rtx_insn_list *next_node;
-
-      twin = twins->insn ();
-
-      {
-	dep_def _new_dep, *new_dep = &_new_dep;
+      rtx_insn *twin = twins[i];
+      dep_def _new_dep, *new_dep = &_new_dep;
 
-	init_dep (new_dep, insn, twin, REG_DEP_OUTPUT);
-	sd_add_dep (new_dep, false);
-      }
-
-      next_node = twins->next ();
-      free_INSN_LIST_node (twins);
-      twins = next_node;
+      init_dep (new_dep, insn, twin, REG_DEP_OUTPUT);
+      sd_add_dep (new_dep, false);
     }
 
   calc_priorities (priorities_roots);
-- 
2.7.4