Bail out HARD_REGISTER vars in asan (PR sanitizer/81224).

2017-06-28  Martin Liska  <mliska@suse.cz>

	PR sanitizer/81224
	* asan.c (instrument_derefs): Bail out inner references
	that are hard register variables.
2017-06-28  Martin Liska  <mliska@suse.cz>

	PR sanitizer/81224
	* gcc.dg/asan/pr81224.c: New test.

From-SVN: r249728

gcc/ChangeLog

+2017-06-28  Martin Liska  <mliska@suse.cz>
+
+	PR sanitizer/81224
+	* asan.c (instrument_derefs): Bail out inner references
+	that are hard register variables.
+
 2017-06-28  Jakub Jelinek  <jakub@redhat.com>
 
 	PR target/81175

gcc/asan.c

@@ -1875,6 +1875,9 @@ instrument_derefs (gimple_stmt_iterator *iter, tree t,
       || bitsize != size_in_bytes * BITS_PER_UNIT)
     return;
 
+  if (VAR_P (inner) && DECL_HARD_REGISTER (inner))
+    return;
+
   if (VAR_P (inner)
       && offset == NULL_TREE
       && bitpos >= 0

gcc/testsuite/ChangeLog

+2017-06-28  Martin Liska  <mliska@suse.cz>
+
+	PR sanitizer/81224
+	* gcc.dg/asan/pr81224.c: New test.
+
 2017-06-28  Eric Botcazou  <ebotcazou@adacore.com>
 
 	* gcc.dg/tree-prof/val-profiler-threads-1.c (main): Fix 2nd argument

gcc/testsuite/gcc.dg/asan/pr81224.c

+/* PR sanitizer/80659 */
+/* { dg-do compile { target { i?86-*-* x86_64-*-* } } } */
+/* { dg-additional-options "-msse2" } */
+
+int a;
+int
+b ()
+{
+  register __attribute__ ((__vector_size__ (4 * sizeof (int)))) int c asm("xmm0");
+  return c[a];
+}