re PR middle-end/71874 (memmove works wrong)

	PR middle-end/71874
	* gimple-fold.c (fold_builtin_memory_op): Use
	get_addr_base_and_unit_offset instead of get_ref_base_and_extent.

	* g++.dg/torture/pr71874.C: New test.

From-SVN: r238484

gcc/ChangeLog

+2016-07-19  Jakub Jelinek  <jakub@redhat.com>
+
+	PR middle-end/71874
+	* gimple-fold.c (fold_builtin_memory_op): Use
+	get_addr_base_and_unit_offset instead of get_ref_base_and_extent.
+
 2016-07-19  Uros Bizjak  <ubizjak@gmail.com>
 
 	* builtins.c: Use HOST_WIDE_INT_1 instead of (HOST_WIDE_INT) 1,

gcc/gimple-fold.c

@@ -796,22 +796,21 @@ gimple_fold_builtin_memory_op (gimple_stmt_iterator *gsi,
 	    {
 	      tree src_base, dest_base, fn;
 	      HOST_WIDE_INT src_offset = 0, dest_offset = 0;
-	      HOST_WIDE_INT size = -1;
-	      HOST_WIDE_INT maxsize = -1;
-	      bool reverse;
+	      HOST_WIDE_INT maxsize;
 
 	      srcvar = TREE_OPERAND (src, 0);
-	      src_base = get_ref_base_and_extent (srcvar, &src_offset,
-						  &size, &maxsize, &reverse);
+	      src_base = get_addr_base_and_unit_offset (srcvar, &src_offset);
+	      if (src_base == NULL)
+		src_base = srcvar;
 	      destvar = TREE_OPERAND (dest, 0);
-	      dest_base = get_ref_base_and_extent (destvar, &dest_offset,
-						   &size, &maxsize, &reverse);
+	      dest_base = get_addr_base_and_unit_offset (destvar,
+							 &dest_offset);
+	      if (dest_base == NULL)
+		dest_base = destvar;
 	      if (tree_fits_uhwi_p (len))
 		maxsize = tree_to_uhwi (len);
 	      else
 		maxsize = -1;
-	      src_offset /= BITS_PER_UNIT;
-	      dest_offset /= BITS_PER_UNIT;
 	      if (SSA_VAR_P (src_base)
 		  && SSA_VAR_P (dest_base))
 		{

gcc/testsuite/ChangeLog

 2016-07-19  Jakub Jelinek  <jakub@redhat.com>
 
+	PR middle-end/71874
+	* g++.dg/torture/pr71874.C: New test.
+
 	PR middle-end/71734
 	* g++.dg/vect/pr70729.cc: Don't include string.h or xmmintrin.h.
 	(my_alloc): Rewritten to use __builtin_posix_memalign and

gcc/testsuite/g++.dg/torture/pr71874.C

+// PR middle-end/71874
+// { dg-do run }
+
+int
+main ()
+{
+  char str[] = "abcdefghijklmnopqrstuvwxyzABCDEF";
+  __builtin_memmove (str + 20, str + 15, 11);
+  if (__builtin_strcmp (str, "abcdefghijklmnopqrstpqrstuvwxyzF") != 0)
+    __builtin_abort ();
+  return 0;
+}