o1-diff

--- before.s    2015-09-06 13:28:04.825778523 +0200
+++ after.s 2015-09-06 13:28:14.425882681 +0200
@@ -25,7 +25,7 @@
    push    {r4, r5}
-   ands    r3, r2, #1
+   tst r2, #1
    beq .L2
    adds    r5, r1, #1
-   ldrb    r1, [r1]    @ zero_extendqisi2
-   mov r4, r1
+   ldrb    r3, [r1]    @ zero_extendqisi2
+   mov r4, r3
    tst r2, #2
@@ -34,10 +34,13 @@
 .L7:
-   ldrh    r2, [r1]
-   cbnz    r3, .L4
-   mov r3, r0
-.L8:
-   strh    r2, [r3]    @ movhi
+   ldrh    r1, [r1]
+   tst r2, #1
+   itte    ne
+   addne   r3, r0, #1
+   strbne  r4, [r0]
+   moveq   r3, r0
+   strh    r1, [r3]    @ movhi
    b   .L1
 .L3:
-   cbz r3, .L1
+   tst r2, #1
+   beq .L1
    b   .L5
@@ -47,8 +50,4 @@
    b   .L1
-.L4:
-   adds    r3, r0, #1
-   strb    r4, [r0]
-   b   .L8
 .L5:
-   strb    r1, [r0]
+   strb    r3, [r0]
 .L1: