diff -r 0082b7bf9501 Misc/NEWS
--- a/Misc/NEWS	Mon Feb 18 22:04:59 2013 -0500
+++ b/Misc/NEWS	Tue Feb 19 14:09:20 2013 -0800
@@ -9,6 +9,9 @@
 Core and Builtins
 -----------------
 
+- On x86 systems fix the ctypes libffi to align the stack to 16-bytes.  This
+  allows libraries being called to use SSE instructions without crashing.
+
 - Issue #7963: Fixed misleading error message that issued when object is
   called without arguments.
 
diff -r 0082b7bf9501 Modules/_ctypes/libffi/src/x86/sysv.S
--- a/Modules/_ctypes/libffi/src/x86/sysv.S	Mon Feb 18 22:04:59 2013 -0500
+++ b/Modules/_ctypes/libffi/src/x86/sysv.S	Tue Feb 19 14:09:20 2013 -0800
@@ -48,6 +48,9 @@
 	movl  16(%ebp),%ecx
 	subl  %ecx,%esp
 
+	/* Align the stack pointer to 16-bytes */
+	andl  $0xfffffff0, %esp
+
 	movl  %esp,%eax
 
 	/* Place all of the ffi_prep_args in position  */