X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=ir%2Fopt%2Floop_unrolling.c;h=564d44a6471f7cd38bdbb145f947eed18eca14d4;hb=98c8808ee1d34300860bb78185558e1731a99368;hp=db2d6722eecc014dd3d7571af1a6cbb69e4e6312;hpb=a346e6ebbd106566b8426d310fae5958751f82db;p=libfirm

diff --git a/ir/opt/loop_unrolling.c b/ir/opt/loop_unrolling.c
index db2d6722e..564d44a64 100644
--- a/ir/opt/loop_unrolling.c
+++ b/ir/opt/loop_unrolling.c
@@ -35,6 +35,7 @@
 # include "irgopt_t.h"
 # include "irnode_t.h"
 # include "irouts.h"
+# include "trouts.h"
 # include "hashptr.h"
 # include "pset.h"
 # include "strength_red.h"
@@ -444,7 +445,7 @@ static void
 copy_loop_body(set *l_n, induct_var_info *info, int unroll_factor)
 {
   int i;
-  copies_t *value, *info_op, *phi, *loop_h, key, *value_block;
+  copies_t *value, *info_op, *phi, *loop_h = NULL, key, *value_block;
 
   ir_node *loop_head = get_loop_node(info->l_itervar_phi, 0);
 
@@ -454,13 +455,13 @@ copy_loop_body(set *l_n, induct_var_info *info, int unroll_factor)
     else if (is_Phi_in_loop_head(value->irn, loop_head))
       phi = value;
     else if (copy_loop_head){
-      /* If the loop head must be copied. */
+      /* The loop head must be copied. */
       for (i = 0; i < unroll_factor - 1; i++){
 	      copy_node(value->irn, NULL);
 	      value->copy[i] = get_irn_link(value->irn);
       }
     } else {
-      /* If the loop head and its nodes mustn't be copied. */
+      /* The loop head and its nodes must not be copied. */
       if((value->irn->op == op_Block             &&
 	        value->irn != loop_head)               ||
 	       (value->irn->op != op_Block             &&
@@ -663,7 +664,7 @@ new_after_loop_block (set *l_n, ir_node* block, copies_t *loop_in, int unroll_fa
 static void
 new_after_loop_node(set *l_n, set *loop_outs, ir_node *node, copies_t *loop_in, int unroll_factor)
 {
-  ir_node *pred, *block_pred, *node_block, *new_phi;
+  ir_node *pred, *block_pred = NULL, *node_block, *new_phi;
   int phi = 0, old_preds, new_preds, all_new_preds, p, q, i, s;
   copies_t key, *value = NULL;
   ir_node **all_in;
@@ -705,10 +706,11 @@ new_after_loop_node(set *l_n, set *loop_outs, ir_node *node, copies_t *loop_in,
 
     if (get_irn_op(block_pred) == op_Proj) {
       if (get_Proj_pred(block_pred) == pred)
-	      break;
+	break;
     }
-    else
+    else {
       block_pred = NULL;
+    }
   }
 
   if (! block_pred) return;
@@ -813,10 +815,11 @@ set_loop_outs(set *l_n, set *loop_outs, set *loop_endblock_outs, induct_var_info
  * Called from a post walker.
  *
  * @param n        An IR node.
- * @param env      Free environment pointer.
+ * @param env      points to a result
  */
 static void do_loop_unroll(ir_node *n, void *env)
 {
+  int *unroll_done = env;
   induct_var_info info;
   copies_t *value;
   set *loop_nodes, *loop_outs, *loop_endblock_outs;
@@ -884,9 +887,11 @@ static void do_loop_unroll(ir_node *n, void *env)
     unroll_factor = 2;
   else return;
 
-  printf("\nloop unrolling with factor %d \n", unroll_factor);
+  if (get_firm_verbosity())
+    printf("\nloop unrolling with factor %d \n", unroll_factor);
 
-  DDMG(get_irn_irg(n));
+  /* ok, we will do unrolling */
+  *unroll_done += 1;
 
   /* The unroll factor must be less than 4. */
   assert(unroll_factor <= MAX_UNROLL);
@@ -921,10 +926,8 @@ static void do_loop_unroll(ir_node *n, void *env)
 
   /* Set the backedge of the loop head. */
   for (value = set_first(loop_nodes); value != NULL; value = set_next(loop_nodes)) {
-    if(value->irn == backedge_jmp){
-
+    if (value->irn == backedge_jmp)
       set_Block_cfgpred(loop_head, backedge_pos, value->copy[unroll_factor-2]);
-    }
   }
   set_loop_outs(loop_nodes, loop_outs, loop_endblock_outs, &info, unroll_factor);
 }
@@ -933,6 +936,7 @@ static void do_loop_unroll(ir_node *n, void *env)
 void optimize_loop_unrolling(ir_graph *irg /* unroll factor, max body size */)
 {
   ir_graph *rem;
+  int unroll_done = 0;
 
   if ( !get_opt_loop_unrolling()) return;
 
@@ -953,7 +957,16 @@ void optimize_loop_unrolling(ir_graph *irg /* unroll factor, max body size */)
   collect_phiprojs(irg);
 
   /* -- Search expressions that can be optimized -- */
-  irg_walk_graph(irg, NULL, do_loop_unroll, NULL);
+  irg_walk_graph(irg, NULL, do_loop_unroll, &unroll_done);
+
+  if (unroll_done) {
+    /* unrolling was done, all info is invalid */
+    set_irg_dom_inconsistent(irg);
+    set_irg_outs_inconsistent(irg);
+    set_irg_loopinfo_state(current_ir_graph, loopinfo_cf_inconsistent);
+    set_trouts_inconsistent();
+    set_irg_callee_info_state(irg, irg_callee_info_inconsistent);
+  }
 
   current_ir_graph = rem;
 }