re PR tree-optimization/26359 (Over optimization of loop when using -ftree-vectorize)

        PR tree-optimization/26359
        * tree-ssa-alias.c (new_type_alias): Set fields for new tag.

From-SVN: r111451

gcc/ChangeLog

+2006-02-26  Dorit Nuzman  <dorit@il.ibm.com>
+
+	PR tree-optimization/26359
+	* tree-ssa-alias.c (new_type_alias): Set fields for new tag.
+
 2006-02-25  Roger Sayle  <roger@eyesopen.com>
 
 	* simplify-rtx.c (simplify_relational_operation_1):  Simplify

gcc/testsuite/ChangeLog

+2006-02-26  Dorit Nuzman  <dorit@il.ibm.com>
+
+	PR tree-optimizations/26359
+	* gcc.dg/vect/vect.exp: Compile tests prefixed with "dump-tree-dceloop" 
+	with -fdump-tree-dceloop-details.
+	* gcc.dg/vect/dump-tree-dceloop-pr26359.c: New test.
+
 2006-02-25  Roger Sayle  <roger@eyesopen.com>
 
 	PR middle-end/23673

gcc/testsuite/gcc.dg/vect/dump-tree-dceloop-pr26359.c

+/* { dg-do compile } */
+/* { dg-require-effective-target vect_int } */
+
+int a[256], b[256], c[256];
+
+foo () {
+  int i;
+
+  for (i=0; i<256; i++){
+    a[i] = b[i] + c[i];
+  }
+}
+
+/* { dg-final { scan-tree-dump-times "Deleting : vect_" 0 "dceloop" } } */
+/* { dg-final { cleanup-tree-dump "dceloop" } } */
+/* { dg-final { cleanup-tree-dump "vect" } } */

gcc/testsuite/gcc.dg/vect/vect.exp

@@ -108,6 +108,12 @@ lappend DEFAULT_VECTCFLAGS "-ftrapv"
 dg-runtest [lsort [glob -nocomplain $srcdir/$subdir/trapv-vect*.\[cS\]]]  \
 	"" $DEFAULT_VECTCFLAGS
 
+# -fdump-tree-dceloop-details tests
+set DEFAULT_VECTCFLAGS $SAVED_DEFAULT_VECTCFLAGS
+lappend DEFAULT_VECTCFLAGS "-fdump-tree-dceloop-details"
+dg-runtest [lsort [glob -nocomplain $srcdir/$subdir/dump-tree-dceloop-*.\[cS\]]]  \
+        "" $DEFAULT_VECTCFLAGS
+
 # With -Os
 lappend DEFAULT_VECTCFLAGS "-Os"
 dg-runtest [lsort [glob -nocomplain $srcdir/$subdir/Os-vect-*.\[cS\]]]  \

gcc/tree-ssa-alias.c

@@ -2712,6 +2712,9 @@ new_type_alias (tree ptr, tree var)
 	    add_may_alias (tag, al);
 	}
     }    
+
+  TREE_READONLY (tag) = TREE_READONLY (var);
+  MTAG_GLOBAL (tag) = is_global_var (var);
 }