re PR tree-optimization/40542 (vectorizes access to volatile array)

	PR tree-optimization/40542
	* tree-vect-stmts.c (vect_analyze_stmt): Don't vectorize volatile 
	types.

From-SVN: r149090

gcc/ChangeLog

+2009-06-30  Ira Rosen  <irar@il.ibm.com>
+
+	PR tree-optimization/40542
+	* tree-vect-stmts.c (vect_analyze_stmt): Don't vectorize volatile 
+	types.
+
 2009-06-30  Martin Jambor  <mjambor@suse.cz>
 
 	PR tree-optimization/40582

gcc/testsuite/ChangeLog

+2009-06-30  Ira Rosen  <irar@il.ibm.com>
+
+	PR tree-optimization/40542
+	* gcc.dg/vect/pr40542.c: New test.
+
 2009-06-30  Martin Jambor  <mjambor@suse.cz>
 
 	PR tree-optimization/40582

gcc/testsuite/gcc.dg/vect/pr40542.c

+/* { dg-do compile } */
+
+void
+volarr_cpy(char *d, volatile char *s)
+{
+  int i;
+  
+  for (i = 0; i < 16; i++)
+    d[i] = s[i];
+}
+
+/* { dg-final { scan-tree-dump-times "vectorized 1 loops" 1 "vect" { xfail *-*-* } } } */
+/* { dg-final { cleanup-tree-dump "vect" } } */
+

gcc/tree-vect-stmts.c

@@ -3910,6 +3910,14 @@ vect_analyze_stmt (gimple stmt, bool *need_to_vectorize, slp_tree node)
       print_gimple_stmt (vect_dump, stmt, 0, TDF_SLIM);
     }
 
+  if (gimple_has_volatile_ops (stmt))
+    {    
+      if (vect_print_dump_info (REPORT_UNVECTORIZED_LOCATIONS))
+        fprintf (vect_dump, "not vectorized: stmt has volatile operands");
+
+      return false;
+    }
+ 
   /* Skip stmts that do not need to be vectorized. In loops this is expected 
      to include:
      - the COND_EXPR which is the loop exit condition