2012-05-31 Richard Guenther <rguenther@suse.de>

	PR middle-end/48493
	* expr.c (expand_assignment): Do not use movmisalign on
	non-memory.

	* gcc.dg/torture/pr48493.c: New testcase.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/branches/gcc-4_7-branch@188056 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 0e97e80..481462a 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2012-05-31  Richard Guenther  <rguenther@suse.de>
+
+       PR middle-end/48493
+       * expr.c (expand_assignment): Do not use movmisalign on
+       non-memory.
+
 2012-05-30  John David Anglin  <dave.anglin@nrc-cnrc.gc.ca>
 
        PR target/52999

diff --git a/gcc/expr.c b/gcc/expr.c
index a3ace7a..e2957d2 100644 (file)
--- a/gcc/expr.c
+++ b/gcc/expr.c
@@ -4593,6 +4593,7 @@ expand_assignment (tree to, tree from, bool nontemporal)
   if ((TREE_CODE (to) == MEM_REF
        || TREE_CODE (to) == TARGET_MEM_REF)
       && mode != BLKmode
+      && !mem_ref_refers_to_non_mem_p (to)
       && ((align = get_object_or_type_alignment (to))
          < GET_MODE_ALIGNMENT (mode))
       && ((icode = optab_handler (movmisalign_optab, mode))

diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index a42115c..9a3a04a 100644 (file)
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2012-05-31  Richard Guenther  <rguenther@suse.de>
+
+       PR middle-end/48493
+       * gcc.dg/torture/pr48493.c: New testcase.
+
 2012-05-30  Jakub Jelinek  <jakub@redhat.com>
 
        PR c++/53356

diff --git a/gcc/testsuite/gcc.dg/torture/pr48493.c b/gcc/testsuite/gcc.dg/torture/pr48493.c
new file mode 100644 (file)
index 0000000..ddb61f2
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/torture/pr48493.c
@@ -0,0 +1,18 @@
+/* { dg-do compile } */
+
+typedef long long T __attribute__((may_alias, aligned (1)));
+
+struct S
+{
+  _Complex float d __attribute__((aligned (8)));
+};
+
+void bar (struct S);
+
+void
+f1 (T x)
+{
+  struct S s;
+  *(T *) ((char *) &s.d + 1) = x;
+  bar (s);
+}