respect dependency edges in dead code elimination

[libfirm] / ir / common / irtools.c

diff --git a/ir/common/irtools.c b/ir/common/irtools.c
index 426ff8f..deecaab 100644 (file)
--- a/ir/common/irtools.c
+++ b/ir/common/irtools.c
@@ -21,7 +21,6 @@
  * @file
  * @brief     Some often needed tool-functions
  * @author    Michael Beck
- * @version   $Id$
  */
 #include "config.h"
 
@@ -54,8 +53,11 @@ void firm_clear_node_and_phi_links(ir_node *n, void *env)
 void firm_clear_block_phis(ir_node *node, void *env)
 {
        (void) env;
-       if (is_Block(node))
+       if (is_Block(node)) {
                set_Block_phis(node, NULL);
+       } else if (is_Phi(node)) {
+               set_Phi_next(node, NULL);
+       }
 }
 
 void firm_collect_block_phis(ir_node *node, void *env)
@@ -178,6 +180,7 @@ void irn_rewire_inputs(ir_node *node)
 {
        ir_node *new_node;
        int      arity;
+       int      n_deps;
        int      i;
 
        new_node = get_new_node(node);
@@ -195,6 +198,13 @@ void irn_rewire_inputs(ir_node *node)
                set_irn_n(new_node, i, new_in);
        }
 
+       n_deps = get_irn_deps(new_node);
+       for (i = 0; i < n_deps; ++i) {
+               ir_node *dep     = get_irn_dep(node, i);
+               ir_node *new_dep = get_new_node(dep);
+               set_irn_dep(new_node, i, new_dep);
+       }
+
        /* Now the new node is complete. We can add it to the hash table for CSE. */
        add_identities(new_node);
 }