More missing config.h

[libfirm] / ir / be / beuses.c

diff --git a/ir/be/beuses.c b/ir/be/beuses.c
index 9be130e..36f586d 100644 (file)
--- a/ir/be/beuses.c
+++ b/ir/be/beuses.c
@@ -84,6 +84,18 @@ static const be_use_t *get_or_set_use_block(be_uses_t *uses,
        return result;
 }
 
+static int is_real_use(const ir_node *node)
+{
+       if(be_is_Spill(node))
+               return 0;
+       /* we don't check for phi loops yet, so don't enable this
+       if(is_Phi(node))
+               return 0;
+       */
+
+       return 1;
+}
+
 unsigned be_get_next_use(be_uses_t *uses, const ir_node *from,
                          unsigned from_step, const ir_node *def,
                          int skip_from_uses)
@@ -107,15 +119,24 @@ unsigned be_get_next_use(be_uses_t *uses, const ir_node *from,
 
                        if (operand == def) {
                                DBG((uses->dbg, LEVEL_3, "found use of %+F at %+F\n", operand, node));
-                               return step;
+
+                               if(!is_real_use(node)) {
+                                       return be_get_next_use(uses, node, step, node, 1);
+                               } else {
+                                       return step;
+                               }
                        }
                }
 
                step++;
        }
 
-       if(be_is_live_end(uses->lv, block, def))
+       if(be_is_live_end(uses->lv, block, def)) {
+               // TODO we really should continue searching the uses of the phi,
+               // as a phi isn't a real use that implies a reload (because we could
+               // easily spill the whole phi)
                return step;
+       }
 
 #ifdef SCAN_INTERBLOCK_USES
        {