ldrht r9, [r0], -r9
ldrht r9, [r0], #0x99
ldrht r9, [r0], #-0x99
+ ldrneht r9, [r0], r9
+ ldrneht r9, [r0], -r9
+ ldrneht r9, [r0], #0x99
+ ldrneht r9, [r0], #-0x99
+ strht r0, [r1], -r2
+ strneht r0, [r1], -r2
+ strht r0, [r1], r2
+ strneht r0, [r1], r2
+ strht r0, [r1], #2
+ strht r0, [r1], #-2
+ strneht r0, [r1], #2
+ strneht r0, [r1], #-2
+
+ @ mov accept A2 encoding as well.
+ mov r9, #0x0999