[1/6] make antic_stores a vec<rtx_insn *>

diff --git a/gcc/store-motion.c b/gcc/store-motion.c
index 301b69b..6d7d37f 100644
--- a/gcc/store-motion.c
+++ b/gcc/store-motion.c
@@ -46,7 +46,6 @@  along with GCC; see the file COPYING3.  If not see
      a compile time hog that needs a rewrite (maybe cache st_exprs to
      invalidate REG_EQUAL/REG_EQUIV notes for?).
    - pattern_regs in st_expr should be a regset (on its own obstack).
-   - antic_stores and avail_stores should be VECs instead of lists.
    - store_motion_mems should be a vec instead of a list.
    - there should be an alloc pool for struct st_expr objects.
    - investigate whether it is helpful to make the address of an st_expr
@@ -66,7 +65,7 @@  struct st_expr
   /* List of registers mentioned by the mem.  */
   rtx pattern_regs;
   /* INSN list of stores that are locally anticipatable.  */
-  rtx_insn_list *antic_stores;
+  vec<rtx_insn *> antic_stores;
   /* INSN list of stores that are locally available.  */
   vec<rtx_insn *> avail_stores;
   /* Next in the list.  */
@@ -148,7 +147,7 @@  st_expr_entry (rtx x)
   ptr->next         = store_motion_mems;
   ptr->pattern      = x;
   ptr->pattern_regs = NULL_RTX;
-  ptr->antic_stores = NULL;
+  ptr->antic_stores.create (0);
   ptr->avail_stores.create (0);
   ptr->reaching_reg = NULL_RTX;
   ptr->index        = 0;
@@ -164,8 +163,8 @@  st_expr_entry (rtx x)
 static void
 free_st_expr_entry (struct st_expr * ptr)
 {
-  free_INSN_LIST_list (& ptr->antic_stores);
-   ptr->avail_stores.release ();
+  ptr->antic_stores.release ();
+  ptr->avail_stores.release ();
 
   free (ptr);
 }
@@ -233,11 +232,7 @@  print_store_motion_mems (FILE * file)
       print_rtl (file, ptr->pattern);
 
       fprintf (file, "\n	 ANTIC stores : ");
-
-      if (ptr->antic_stores)
-	print_rtl (file, ptr->antic_stores);
-      else
-	fprintf (file, "(nil)");
+      print_rtx_insn_vec (file, ptr->antic_stores);
 
       fprintf (file, "\n	 AVAIL stores : ");
 
@@ -566,11 +561,11 @@  find_moveable_store (rtx_insn *insn, int *regs_set_before, int *regs_set_after)
   /* Do not check for anticipatability if we either found one anticipatable
      store already, or tested for one and found out that it was killed.  */
   check_anticipatable = 0;
-  if (!ptr->antic_stores)
+  if (ptr->antic_stores.is_empty ())
     check_anticipatable = 1;
   else
     {
-      rtx_insn *tmp = ptr->antic_stores->insn ();
+      rtx_insn *tmp = ptr->antic_stores.last ();
       if (tmp != NULL_RTX
 	  && BLOCK_FOR_INSN (tmp) != bb)
 	check_anticipatable = 1;
@@ -582,7 +577,7 @@  find_moveable_store (rtx_insn *insn, int *regs_set_before, int *regs_set_after)
 	tmp = NULL;
       else
 	tmp = insn;
-      ptr->antic_stores = alloc_INSN_LIST (tmp, ptr->antic_stores);
+      ptr->antic_stores.safe_push (tmp);
     }
 
   /* It is not necessary to check whether store is available if we did
@@ -683,9 +678,9 @@  compute_store_table (void)
       for (ptr = first_st_expr (); ptr != NULL; ptr = next_st_expr (ptr))
 	{
 	  LAST_AVAIL_CHECK_FAILURE (ptr) = NULL_RTX;
-	  if (ptr->antic_stores
-	      && (tmp = ptr->antic_stores->insn ()) == NULL_RTX)
-	    ptr->antic_stores = ptr->antic_stores->next ();
+	  if (!ptr->antic_stores.is_empty ()
+	      && (tmp = ptr->antic_stores.last ()) == NULL)
+	    ptr->antic_stores.pop ();
 	}
     }
 
@@ -831,7 +826,7 @@  remove_reachable_equiv_notes (basic_block bb, struct st_expr *smexpr)
   int sp;
   edge act;
   sbitmap visited = sbitmap_alloc (last_basic_block_for_fn (cfun));
-  rtx last, note;
+  rtx note;
   rtx_insn *insn;
   rtx mem = smexpr->pattern;
 
@@ -866,13 +861,13 @@  remove_reachable_equiv_notes (basic_block bb, struct st_expr *smexpr)
 	}
       bitmap_set_bit (visited, bb->index);
 
+      rtx_insn *last;
       if (bitmap_bit_p (st_antloc[bb->index], smexpr->index))
 	{
-	  for (last = smexpr->antic_stores;
-	       BLOCK_FOR_INSN (XEXP (last, 0)) != bb;
-	       last = XEXP (last, 1))
-	    continue;
-	  last = XEXP (last, 0);
+	  unsigned int i;
+	  FOR_EACH_VEC_ELT_REVERSE (smexpr->antic_stores, i, last)
+	    if (BLOCK_FOR_INSN (last) == bb)
+	      break;
 	}
       else
 	last = NEXT_INSN (BB_END (bb));
@@ -911,15 +906,17 @@  replace_store_insn (rtx reg, rtx_insn *del, basic_block bb,
 		    struct st_expr *smexpr)
 {
   rtx_insn *insn;
-  rtx mem, note, set, ptr;
+  rtx mem, note, set;
 
   mem = smexpr->pattern;
   insn = gen_move_insn (reg, SET_SRC (single_set (del)));
 
-  for (ptr = smexpr->antic_stores; ptr; ptr = XEXP (ptr, 1))
-    if (XEXP (ptr, 0) == del)
+  unsigned int i;
+  rtx_insn *temp;
+  FOR_EACH_VEC_ELT_REVERSE (smexpr->antic_stores, i, temp)
+    if (temp == del)
       {
-	XEXP (ptr, 0) = insn;
+	smexpr->antic_stores[i] = insn;
 	break;
       }
 
@@ -1001,7 +998,6 @@  build_store_vectors (void)
   basic_block bb;
   int *regs_set_in_block;
   rtx_insn *insn;
-  rtx_insn_list *st;
   struct st_expr * ptr;
   unsigned int max_gcse_regno = max_reg_num ();
 
@@ -1038,9 +1034,9 @@  build_store_vectors (void)
 	  bitmap_set_bit (st_avloc[bb->index], ptr->index);
 	}
 
-      for (st = ptr->antic_stores; st != NULL; st = st->next ())
+      unsigned int i;
+      FOR_EACH_VEC_ELT_REVERSE (ptr->antic_stores, i, insn)
 	{
-	  insn = st->insn ();
 	  bb = BLOCK_FOR_INSN (insn);
 	  bitmap_set_bit (st_antloc[bb->index], ptr->index);
 	}