re PR tree-optimization/18607 (Vectorizer: data_reference is overwritten in vect_analyze_data_refs)

2004-11-30  Ira Rosen  <irar@il.ibm.com>

        PR tree-opt/18607
        * tree-vectorizer.c (vect_analyze_data_refs): Use temporary
        variable for data_reference when looking for memtag.

From-SVN: r91521

gcc/ChangeLog

+2004-11-30  Ira Rosen  <irar@il.ibm.com>
+
+	PR tree-opt/18607
+	* tree-vectorizer.c (vect_analyze_data_refs): Use temporary
+	variable for data_reference when looking for memtag. 
+
 2004-11-30  Jakub Jelinek  <jakub@redhat.com>
 
 	* c-opts.c (check_deps_environment_vars): If spec != NULL, set

gcc/testsuite/gcc.dg/vect/vect-89.c

+/* { dg-require-effective-target vect_int } */
+
+#include <stdarg.h>
+#include "tree-vect.h"
+
+#define N 16
+
+struct tmp_struct
+{
+  int x;
+  int y[N];
+};
+	 
+int main1 ()
+{  
+  int i, *q;
+  struct tmp_struct tmp, *p;
+
+  p = &tmp;
+  q = p->y;
+
+  for (i = 0; i < N; i++)
+    {
+      *q++ = 5;
+    }
+
+  /* check results: */  
+  for (i = 0; i < N; i++)
+    {
+      if (p->y[i] != 5)
+        {
+          abort ();
+        }
+    }
+
+  return 0;
+}
+
+int main (void)
+{ 
+  check_vect ();
+  
+  return main1 ();
+} 
+
+/* { dg-final { scan-tree-dump-times "vectorized 1 loops" 1 "vect" } } */

gcc/tree-vectorizer.c

@@ -4899,7 +4899,7 @@ vect_analyze_data_refs (loop_vec_info loop_vinfo)
   int nbbs = loop->num_nodes;
   block_stmt_iterator si;
   int j;
-  struct data_reference *dr;
+  struct data_reference *dr, *tmp_dr;
   tree tag;
   tree address_base;
   bool base_aligned_p;
@@ -5013,9 +5013,9 @@ vect_analyze_data_refs (loop_vec_info loop_vinfo)
 	      switch (TREE_CODE (address_base))
 		{
 		case ARRAY_REF:
-		  dr = analyze_array (stmt, TREE_OPERAND (symbl, 0), 
-				      DR_IS_READ(dr));
-		  tag = vect_get_base_and_bit_offset (dr, DR_BASE_NAME (dr), 
+		  tmp_dr = analyze_array (stmt, TREE_OPERAND (symbl, 0), 
+					  DR_IS_READ (tmp_dr));
+		  tag = vect_get_base_and_bit_offset (tmp_dr, DR_BASE_NAME (tmp_dr), 
 			   NULL_TREE, loop_vinfo, &offset, &base_aligned_p);
 		  if (!tag)
 		    {