* gcc-interface/decl.c (create_concat_name): Add explicit cast.

[pf3gnuchains/gcc-fork.git] / gcc / ira-costs.c

diff --git a/gcc/ira-costs.c b/gcc/ira-costs.c
index 12d3ed6..dc983fd 100644 (file)
--- a/gcc/ira-costs.c
+++ b/gcc/ira-costs.c
@@ -232,20 +232,42 @@ setup_regno_cost_classes_by_aclass (int regno, enum reg_class aclass)
   int i;
   PTR *slot;
   HARD_REG_SET temp, temp2;
+  bool exclude_p;
 
   if ((classes_ptr = cost_classes_aclass_cache[aclass]) == NULL)
     {
       COPY_HARD_REG_SET (temp, reg_class_contents[aclass]);
       AND_COMPL_HARD_REG_SET (temp, ira_no_alloc_regs);
+      /* We exclude classes from consideration which are subsets of
+        ACLASS only if ACLASS is a pressure class or subset of a
+        pressure class.  It means by the definition of pressure classes
+        that cost of moving between susbets of ACLASS is cheaper than
+        load or store.  */
+      for (i = 0; i < ira_pressure_classes_num; i++)
+       {
+         cl = ira_pressure_classes[i];
+         if (cl == aclass)
+           break;
+         COPY_HARD_REG_SET (temp2, reg_class_contents[cl]);
+         AND_COMPL_HARD_REG_SET (temp2, ira_no_alloc_regs);
+         if (hard_reg_set_subset_p (temp, temp2))
+           break;
+       }
+      exclude_p = i < ira_pressure_classes_num;
       classes.num = 0;
       for (i = 0; i < ira_important_classes_num; i++)
        {
          cl = ira_important_classes[i];
-         COPY_HARD_REG_SET (temp2, reg_class_contents[cl]);
-         AND_COMPL_HARD_REG_SET (temp2, ira_no_alloc_regs);
-         if (! ira_reg_pressure_class_p[cl]
-             && hard_reg_set_subset_p (temp2, temp) && cl != aclass)
-           continue;
+         if (exclude_p)
+           {
+             /* Exclude no-pressure classes which are subsets of
+                ACLASS.  */
+             COPY_HARD_REG_SET (temp2, reg_class_contents[cl]);
+             AND_COMPL_HARD_REG_SET (temp2, ira_no_alloc_regs);
+             if (! ira_reg_pressure_class_p[cl]
+                 && hard_reg_set_subset_p (temp2, temp) && cl != aclass)
+               continue;
+           }
          classes.classes[classes.num++] = cl;
        }
       slot = htab_find_slot (cost_classes_htab, &classes, INSERT);