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diff --git a/gcc/config/spu/float_unsdidf.c b/gcc/config/spu/float_unsdidf.c
new file mode 100644
index 00000000..4fdf0b88
--- /dev/null
+++ b/gcc/config/spu/float_unsdidf.c
@@ -0,0 +1,54 @@
+/* Copyright (C) 2006, 2008, 2009 Free Software Foundation, Inc.
+  
+   This file is free software; you can redistribute it and/or modify it under
+   the terms of the GNU General Public License as published by the Free
+   Software Foundation; either version 3 of the License, or (at your option)
+   any later version.
+  
+   This file is distributed in the hope that it will be useful, but WITHOUT
+   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+   for more details.
+  
+   Under Section 7 of GPL version 3, you are granted additional
+   permissions described in the GCC Runtime Library Exception, version
+   3.1, as published by the Free Software Foundation.
+
+   You should have received a copy of the GNU General Public License and
+   a copy of the GCC Runtime Library Exception along with this program;
+   see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <spu_intrinsics.h>
+const unsigned char __didf_scale[16] __attribute__ ((__aligned__ (16))) = {
+  0x00, 0x00, 0x04, 0x3e,
+  0x00, 0x00, 0x04, 0x1e,
+  0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00
+};
+const unsigned char __didf_pat[16] __attribute__ ((__aligned__ (16))) = {
+  0x02, 0x03, 0x10, 0x11,
+  0x12, 0x13, 0x80, 0x80,
+  0x06, 0x07, 0x14, 0x15,
+  0x16, 0x17, 0x80, 0x80
+};
+
+/* double __float_unsdidf (unsigned long long int) 
+   Construct two exact doubles representing the high and low parts (in
+   parallel), then add them. */
+qword __float_unsdidf (qword DI);
+qword
+__float_unsdidf (qword DI)
+{
+  qword t0, t1, t2, t3, t4, t5, t6, t7, t8;
+  t0 = si_clz (DI);
+  t1 = si_shl (DI, t0);
+  t2 = si_ceqi (t0, 32);
+  t3 = si_sf (t0, *(const qword *) __didf_scale);
+  t4 = si_a (t1, t1);
+  t5 = si_andc (t3, t2);
+  t6 = si_shufb (t5, t4, *(const qword *) __didf_pat);
+  t7 = si_shlqbii (t6, 4);
+  t8 = si_shlqbyi (t7, 8);
+  return si_dfa (t7, t8);
+}