Backport of http://gcc.gnu.org/ml/gcc-patches/2010-12/msg01096.html
This should fix the ICE found in samba

-Khem

Index: a/gcc/config/arm/arm.md
===================================================================
--- a/gcc/config/arm/arm.md	(revision 167797)
+++ b/gcc/config/arm/arm.md	(working copy)
@@ -4137,8 +4137,8 @@
 })
 
 (define_split
-  [(set (match_operand:SI 0 "register_operand" "")
-	(zero_extend:SI (match_operand:HI 1 "register_operand" "")))]
+  [(set (match_operand:SI 0 "s_register_operand" "")
+	(zero_extend:SI (match_operand:HI 1 "s_register_operand" "")))]
   "!TARGET_THUMB2 && !arm_arch6"
   [(set (match_dup 0) (ashift:SI (match_dup 2) (const_int 16)))
    (set (match_dup 0) (lshiftrt:SI (match_dup 0) (const_int 16)))]
@@ -4244,8 +4244,8 @@
 })
 
 (define_split
-  [(set (match_operand:SI 0 "register_operand" "")
-	(zero_extend:SI (match_operand:QI 1 "register_operand" "")))]
+  [(set (match_operand:SI 0 "s_register_operand" "")
+	(zero_extend:SI (match_operand:QI 1 "s_register_operand" "")))]
   "!arm_arch6"
   [(set (match_dup 0) (ashift:SI (match_dup 2) (const_int 24)))
    (set (match_dup 0) (lshiftrt:SI (match_dup 0) (const_int 24)))]
Index: a/gcc/testsuite/gcc.target/arm/pr46883.c
===================================================================
--- a/gcc/testsuite/gcc.target/arm/pr46883.c	(revision 0)
+++ b/gcc/testsuite/gcc.target/arm/pr46883.c	(revision 0)
@@ -0,0 +1,16 @@
+/* { dg-do compile } */
+/* { dg-options "-O1 -march=armv5te" } */
+
+void bar (unsigned char *q, unsigned short *data16s, int len)
+{
+  int i;
+
+  for (i = 0; i < len; i++)
+    {
+      q[2 * i] =
+        (((data16s[i] & 0xFF) << 8) | ((data16s[i] >> 8) & 0xFF)) & 0xFF;
+      q[2 * i + 1] =
+        ((unsigned short)
+         (((data16s[i] & 0xFF) << 8) | ((data16s[i] >> 8) & 0xFF))) >> 8;
+    }
+}