Source: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45805

Index: gcc-4.5/gcc/config/arm/neon.md
===================================================================
--- gcc-4.5.orig/gcc/config/arm/neon.md	2010-09-28 12:04:38.000000000 -0700
+++ gcc-4.5/gcc/config/arm/neon.md	2010-09-28 12:07:28.026227000 -0700
@@ -5682,9 +5682,9 @@
 ;; Vectorize for non-neon-quad case
 (define_insn "neon_unpack<US>_<mode>"
  [(set (match_operand:<V_widen> 0 "register_operand" "=w")
-       (SE:<V_widen> (match_operand:VDI 1 "register_operand" "")))]
+       (SE:<V_widen> (match_operand:VDI 1 "register_operand" "w")))]
  "TARGET_NEON"
- "vmovl.<US><V_sz_elem> %q0, %1"
+ "vmovl.<US><V_sz_elem> %q0, %P1"
   [(set_attr "neon_type" "neon_shift_1")]
 )
 
@@ -5721,7 +5721,7 @@
  		       (SE:<V_widen> 
 			   (match_operand:VDI 2 "register_operand" "w"))))]
   "TARGET_NEON"
-  "vmull.<US><V_sz_elem> %q0, %1, %2"
+  "vmull.<US><V_sz_elem> %q0, %P1, %P2"
   [(set_attr "neon_type" "neon_shift_1")]
 )