alpha.c (alpha_rtx_costs): Cost 0 for a memory source.

        * config/alpha/alpha.c (alpha_rtx_costs) <FLOAT_EXTEND>: Cost 0
        for a memory source.

From-SVN: r104425

gcc/ChangeLog

@@ -4,6 +4,9 @@
 	* real.c (exact_real_truncate): Return false if the format cannot
 	represent the number as a normal.
 
+	* config/alpha/alpha.c (alpha_rtx_costs) <FLOAT_EXTEND>: Cost 0
+	for a memory source.
+
 2005-09-19  Dorit Nuzman  <dorit@il.ibm.com>
 
 	* tree-ssa-operands.c (swap_tree_operands): Export.

gcc/config/alpha/alpha.c

@@ -1473,11 +1473,17 @@ alpha_rtx_costs (rtx x, int code, int outer_code, int *total)
     case UNSIGNED_FLOAT:
     case FIX:
     case UNSIGNED_FIX:
-    case FLOAT_EXTEND:
     case FLOAT_TRUNCATE:
       *total = cost_data->fp_add;
       return false;
 
+    case FLOAT_EXTEND:
+      if (GET_CODE (XEXP (x, 0)) == MEM)
+	*total = 0;
+      else
+	*total = cost_data->fp_add;
+      return false;
+
     default:
       return false;
     }