re PR tree-optimization/65709 (Bad code for LZ4 decompression with -O3 on x86_64)

	PR tree-optimization/65709
	* ubsan.c (instrument_mem_ref): Use TREE_TYPE (base) instead of
	TREE_TYPE (TREE_TYPE (t)).

	* c-c++-common/ubsan/align-9.c: New test.

From-SVN: r221958

gcc/ChangeLog

+2015-04-09  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/65709
+	* ubsan.c (instrument_mem_ref): Use TREE_TYPE (base) instead of
+	TREE_TYPE (TREE_TYPE (t)).
+
 2015-04-09  Vladimir Makarov  <vmakarov@redhat.com>
 
 	PR target/65710

gcc/testsuite/ChangeLog

+2015-04-09  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/65709
+	* c-c++-common/ubsan/align-9.c: New test.
+
 2013-04-09  Paul Thomas  <pault@gcc.gnu.org>
 
 	PR fortran/56852
-	* gfortran.dg/pr56852.f90 : New test
+	* gfortran.dg/pr56852.f90: New test.
 
 2015-04-09  Marek Polacek  <polacek@redhat.com>
 	    Jakub Jelinek  <jakub@redhat.com>

gcc/testsuite/c-c++-common/ubsan/align-9.c

+/* Limit this to known non-strict alignment targets.  */
+/* { dg-do run { target { i?86-*-linux* x86_64-*-linux* } } } */
+/* { dg-options "-O2 -fsanitize=alignment -fsanitize-recover=alignment" } */
+
+__attribute__((noinline, noclone)) void
+foo (void *p, const void *q)
+{
+  *(long int *) p = *(const long int *) q;
+}
+
+int
+main ()
+{
+  struct S { long c; char f[64]; char d; char e[2 * sizeof (long)]; char g[64]; } s;
+  __builtin_memset (&s, '\0', sizeof s);
+  foo (&s.e[0], &s.e[sizeof (long)]);
+  return 0;
+}
+
+/* { dg-output "\.c:8:\[0-9]*: \[^\n\r]*load of misaligned address 0x\[0-9a-fA-F]* for type 'const long int', which requires \[48] byte alignment.*" } */
+/* { dg-output "\.c:8:\[0-9]*: \[^\n\r]*store to misaligned address 0x\[0-9a-fA-F]* for type 'long int', which requires \[48] byte alignment" } */

gcc/ubsan.c

@@ -1232,9 +1232,9 @@ instrument_mem_ref (tree mem, tree base, gimple_stmt_iterator *iter,
   tree t = TREE_OPERAND (base, 0);
   if (!POINTER_TYPE_P (TREE_TYPE (t)))
     return;
-  if (RECORD_OR_UNION_TYPE_P (TREE_TYPE (TREE_TYPE (t))) && mem != base)
+  if (RECORD_OR_UNION_TYPE_P (TREE_TYPE (base)) && mem != base)
     ikind = UBSAN_MEMBER_ACCESS;
-  tree kind = build_int_cst (TREE_TYPE (t), ikind);
+  tree kind = build_int_cst (build_pointer_type (TREE_TYPE (base)), ikind);
   tree alignt = build_int_cst (pointer_sized_int_node, align);
   gcall *g = gimple_build_call_internal (IFN_UBSAN_NULL, 3, t, kind, alignt);
   gimple_set_location (g, gimple_location (gsi_stmt (*iter)));