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[pf3gnuchains/gcc-fork.git] / gcc / tree-ssa-copyrename.c

diff --git a/gcc/tree-ssa-copyrename.c b/gcc/tree-ssa-copyrename.c
index 494e3a5..71599cd 100644 (file)
--- a/gcc/tree-ssa-copyrename.c
+++ b/gcc/tree-ssa-copyrename.c
@@ -16,8 +16,8 @@ GNU General Public License for more details.
 
 You should have received a copy of the GNU General Public License
 along with GCC; see the file COPYING.  If not, write to
-the Free Software Foundation, 59 Temple Place - Suite 330,
-Boston, MA 02111-1307, USA.  */
+the Free Software Foundation, 51 Franklin Street, Fifth Floor,
+Boston, MA 02110-1301, USA.  */
 
 #include "config.h"
 #include "system.h"
@@ -39,8 +39,6 @@ Boston, MA 02111-1307, USA.  */
 #include "tree-pass.h"
 #include "langhooks.h"
 
-extern void rename_ssa_copies (void);
-
 /* The following routines implement the SSA copy renaming phase.
 
    This optimization looks for copies between 2 SSA_NAMES, either through a
@@ -146,19 +144,6 @@ copy_rename_partition_coalesce (var_map map, tree var1, tree var2, FILE *debug)
   root1 = SSA_NAME_VAR (rep1);
   root2 = SSA_NAME_VAR (rep2);
 
-  if (DECL_HARD_REGISTER (root1) || DECL_HARD_REGISTER (root2))
-    {
-      if (debug)
-        {
-         if (DECL_HARD_REGISTER (root1))
-           print_generic_expr (debug, var1, TDF_SLIM);
-         else
-           print_generic_expr (debug, var2, TDF_SLIM);
-         fprintf (debug, " is a hardware register.  No Coalescing.\n");
-       }
-      return;
-    }
-
   ann1 = var_ann (root1);
   ann2 = var_ann (root2);
 
@@ -169,6 +154,16 @@ copy_rename_partition_coalesce (var_map map, tree var1, tree var2, FILE *debug)
       return;
     }
 
+  /* Don't coalesce if one of the variables occurs in an abnormal PHI.  */
+  abnorm = (SSA_NAME_OCCURS_IN_ABNORMAL_PHI (rep1)
+           || SSA_NAME_OCCURS_IN_ABNORMAL_PHI (rep2));
+  if (abnorm)
+    {
+      if (debug)
+       fprintf (debug, " : Abnormal PHI barrier.  No coalesce.\n");
+      return;
+    }
+
   /* Partitions already have the same root, simply merge them.  */
   if (root1 == root2)
     {
@@ -251,16 +246,18 @@ copy_rename_partition_coalesce (var_map map, tree var1, tree var2, FILE *debug)
       return;
     }
 
-  /* Don't coalesce if one of the variables occurs in an abnormal PHI.  */
-  abnorm = (SSA_NAME_OCCURS_IN_ABNORMAL_PHI (rep1)
-           || SSA_NAME_OCCURS_IN_ABNORMAL_PHI (rep2));
-  if (abnorm)
+  /* Don't coalesce if the aliasing sets of the types are different.  */
+  if (POINTER_TYPE_P (TREE_TYPE (root1))
+      && POINTER_TYPE_P (TREE_TYPE (root2))
+      && get_alias_set (TREE_TYPE (TREE_TYPE (root1)))
+          != get_alias_set (TREE_TYPE (TREE_TYPE (root2))))
     {
       if (debug)
-       fprintf (debug, " : Abnormal PHI barrier.  No coalesce.\n");
+       fprintf (debug, " : 2 different aliasing sets. No coalesce.\n");
       return;
     }
 
+
   /* Merge the two partitions.  */
   p3 = partition_union (map->var_partition, p1, p2);
 
@@ -294,7 +291,7 @@ copy_rename_partition_coalesce (var_map map, tree var1, tree var2, FILE *debug)
    then cause the SSA->normal pass to attempt to coalesce them all to the same 
    variable.  */
 
-void
+static void
 rename_ssa_copies (void)
 {
   var_map map;