diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index a13d96b848d..e0f89586ba9 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2010-11-10  Richard Guenther  <rguenther@suse.de>
+
+	PR tree-optimization/44964
+	* ipa-inline.c (cgraph_flatten): Check that SSA form matches.
+
 2010-11-10  Martin Jambor  <mjambor@suse.cz>
 
 	PR tree-optimization/46351
diff --git a/gcc/ipa-inline.c b/gcc/ipa-inline.c
index 0072d61bfc3..61fc6b9992e 100644
--- a/gcc/ipa-inline.c
+++ b/gcc/ipa-inline.c
@@ -1407,6 +1407,14 @@ cgraph_flatten (struct cgraph_node *node)
 	  continue;
 	}
 
+      if (gimple_in_ssa_p (DECL_STRUCT_FUNCTION (node->decl))
+	  != gimple_in_ssa_p (DECL_STRUCT_FUNCTION (e->callee->decl)))
+	{
+	  if (dump_file)
+	    fprintf (dump_file, "Not inlining: SSA form does not match.\n");
+	  continue;
+	}
+
       /* Inline the edge and flatten the inline clone.  Avoid
          recursing through the original node if the node was cloned.  */
       if (dump_file)
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 31d31d94067..92a850909a5 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2010-11-10  Richard Guenther  <rguenther@suse.de>
+
+	PR tree-optimization/44964
+	* gcc.dg/pr44964.c: New testcase.
+
 2010-11-10  Eric Botcazou  <ebotcazou@adacore.com>
 
 	* gnat.dg/opt10.adb: Fix typo.
diff --git a/gcc/testsuite/gcc.dg/pr44964.c b/gcc/testsuite/gcc.dg/pr44964.c
new file mode 100644
index 00000000000..1df1bde0703
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr44964.c
@@ -0,0 +1,21 @@
+/* { dg-do compile } */
+/* { dg-options "-fkeep-inline-functions -O" } */
+
+static inline __attribute__ ((const))
+void baz (int i)
+{
+}
+
+static __attribute__ ((always_inline))
+inline __attribute__ ((flatten))
+void bar (void)
+{
+  baz (0);
+}
+
+void
+foo (void)
+{
+  bar ();
+}
+