typo fixed

[libfirm] / ir / be / belive.c

diff --git a/ir/be/belive.c b/ir/be/belive.c
index 8ebcdff..bf96266 100644 (file)
--- a/ir/be/belive.c
+++ b/ir/be/belive.c
@@ -60,26 +60,27 @@ static INLINE void mark_live_end(ir_node *block, const ir_node *irn)
 static void live_end_at_block(ir_node *def, ir_node *block,
                pset *visited, int is_true_out)
 {
-       if(pset_find_ptr(visited, block))
-               return;
-
-       pset_insert_ptr(visited, block);
        mark_live_end(block, def);
-
        if(is_true_out)
                mark_live_out(block, def);
 
-       /*
-        * If this block is not the definition block, we have to go up
-        * further.
-        */
-       if(get_nodes_block(def) != block) {
-               int i, n;
+       if(!pset_find_ptr(visited, block)) {
+
+               pset_insert_ptr(visited, block);
+
+               /*
+                * If this block is not the definition block, we have to go up
+                * further.
+                */
+               if(get_nodes_block(def) != block) {
+                       int i, n;
+
+                       mark_live_in(block, def);
 
-               mark_live_in(block, def);
+                       for(i = 0, n = get_irn_arity(block); i < n; ++i)
+                               live_end_at_block(def, get_nodes_block(get_irn_n(block, i)), visited, 1);
+               }
 
-               for(i = 0, n = get_irn_arity(block); i < n; ++i)
-                       live_end_at_block(def, get_nodes_block(get_irn_n(block, i)), visited, 1);
        }
 }
 
@@ -96,7 +97,7 @@ static void liveness_for_node(ir_node *irn, void *env)
        ir_node *def_block;
        pset *visited;
 
-       /* Don't compute liveness information fornon-data nodes. */
+       /* Don't compute liveness information for non-data nodes. */
        if(!is_data_node(irn))
                return;
 
@@ -118,13 +119,6 @@ static void liveness_for_node(ir_node *irn, void *env)
                /* Get the block where the usage is in. */
                use_block = get_nodes_block(use);
 
-               /*
-                * If the block of the definition equals the use block, we can skip
-                * the following computations, since this use is local to a block.
-                */
-               if(def_block == use_block)
-                       continue;
-
                /*
                 * If the use is a phi function, determine the corresponding block
                 * through which the value reaches the phi function and mark the
@@ -148,7 +142,7 @@ static void liveness_for_node(ir_node *irn, void *env)
                 * Else, the value is live in at this block. Mark it and call live
                 * out on the predecessors.
                 */
-               else {
+               else if(def_block != use_block) {
                        int i, n;
 
                        mark_live_in(use_block, irn);