optimize 16- and 32-bit moves

function                                             old     new   delta
udhcpd_main                                         1239    1257     +18
udhcp_add_simple_option                               93      92      -1
buffer_read_le_u32                                    19      18      -1
unpack_gz_stream_with_info                           526     520      -6
dnsd_main                                           1470    1463      -7
udhcp_run_script                                    1208    1186     -22
send_ACK                                             255     229     -26
arping_main                                         1661    1623     -38
send_offer                                           470     428     -42
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/8 up/down: 18/-143)          Total: -125 bytes

1 files changed, 2 insertions, 3 deletions

diff --git a/networking/udhcp/options.c b/networking/udhcp/options.c
index 2c27e7033..581a7b671 100644
--- a/networking/udhcp/options.c
+++ b/networking/udhcp/options.c
@@ -224,9 +224,8 @@ int FAST_FUNC add_simple_option(uint8_t *optionptr, uint8_t code, uint32_t data)
                         option[OPT_LEN] = len;
                         if (BB_BIG_ENDIAN)
                                 data <<= 8 * (4 - len);
-                        /* This memcpy is for processors which can't
-                         * handle a simple unaligned 32-bit assignment */
-                        memcpy(&option[OPT_DATA], &data, 4);
+                        /* Assignment is unaligned! */
+                        move_to_unaligned32(&option[OPT_DATA], data);
                         return add_option_string(optionptr, option);
                 }
         }