Index: config/arm/arm.c
===================================================================
--- config/arm/arm.c	(revision 176385)
+++ config/arm/arm.c	(working copy)
@@ -3172,6 +3172,19 @@
       return code;
     }
 
+  /* If *op0 is (zero_extend:SI (subreg:QI (reg:SI) 0)) and comparing
+     with const0_rtx, change it to (and:SI (reg:SI) (const_int 255)),
+     to facilitate possible combining with a cmp into 'ands'.  */
+  if (mode == SImode
+      && GET_CODE (*op0) == ZERO_EXTEND
+      && GET_CODE (XEXP (*op0, 0)) == SUBREG
+      && GET_MODE (XEXP (*op0, 0)) == QImode
+      && GET_MODE (SUBREG_REG (XEXP (*op0, 0))) == SImode
+      && subreg_lowpart_p (XEXP (*op0, 0))
+      && *op1 == const0_rtx)
+    *op0 = gen_rtx_AND (SImode, SUBREG_REG (XEXP (*op0, 0)),
+			GEN_INT (255));
+
   /* Comparisons smaller than DImode.  Only adjust comparisons against
      an out-of-range constant.  */
   if (GET_CODE (*op1) != CONST_INT
Index: testsuite/gcc.target/arm/combine-movs.c
===================================================================
--- testsuite/gcc.target/arm/combine-movs.c	(revision 0)
+++ testsuite/gcc.target/arm/combine-movs.c	(revision 0)
@@ -0,0 +1,11 @@
+/* { dg-do compile } */
+/* { dg-options "-O" }  */
+
+void foo (unsigned long r[], unsigned int d)
+{
+  int i, n = d / 32;
+  for (i = 0; i < n; ++i)
+    r[i] = 0;
+}
+
+/* { dg-final { scan-assembler "movs\tr\[0-9\]" } } */
Index: testsuite/gcc.target/arm/unsigned-extend-2.c
===================================================================
--- testsuite/gcc.target/arm/unsigned-extend-2.c	(revision 0)
+++ testsuite/gcc.target/arm/unsigned-extend-2.c	(revision 0)
@@ -0,0 +1,17 @@
+/* { dg-do compile } */
+/* { dg-options "-O -march=armv6t2" } */
+
+unsigned short foo (unsigned short x)
+{
+  unsigned char i = 0;
+  for (i = 0; i < 8; i++)
+    {
+      x >>= 1;
+      x &= 0x7fff;
+    }
+  return x;
+}
+
+/* { dg-final { scan-assembler "ands" } } */
+/* { dg-final { scan-assembler-not "uxtb" } } */
+/* { dg-final { scan-assembler-not "cmp" } } */