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, 15 insertions, 10 deletions

diff --git a/networking/udhcp/dhcpd.c b/networking/udhcp/dhcpd.c
index b512c45ee..7b4596895 100644
--- a/networking/udhcp/dhcpd.c
+++ b/networking/udhcp/dhcpd.c
@@ -30,7 +30,9 @@ int udhcpd_main(int argc UNUSED_PARAM, char **argv)
         int server_socket = -1, bytes, retval, max_sock;
         struct dhcpMessage packet;
         uint8_t *state, *server_id, *requested;
-        uint32_t server_id_align, requested_align, static_lease_ip;
+        uint32_t server_id_aligned = server_id_aligned; /* for compiler */
+        uint32_t requested_aligned = requested_aligned;
+        uint32_t static_lease_ip;
         unsigned timeout_end;
         unsigned num_ips;
         unsigned opt;
@@ -79,7 +81,7 @@ int udhcpd_main(int argc UNUSED_PARAM, char **argv)
         option = find_option(server_config.options, DHCP_LEASE_TIME);
         server_config.lease = LEASE_TIME;
         if (option) {
-                memcpy(&server_config.lease, option->data + 2, 4);
+                move_from_unaligned32(server_config.lease, option->data + 2);
                 server_config.lease = ntohl(server_config.lease);
         }
 
@@ -190,21 +192,24 @@ int udhcpd_main(int argc UNUSED_PARAM, char **argv)
                         requested = get_option(&packet, DHCP_REQUESTED_IP);
                         server_id = get_option(&packet, DHCP_SERVER_ID);
 
-                        if (requested) memcpy(&requested_align, requested, 4);
-                        if (server_id) memcpy(&server_id_align, server_id, 4);
+                        if (requested)
+                                move_from_unaligned32(requested_aligned, requested);
+                        if (server_id)
+                                move_from_unaligned32(server_id_aligned, server_id);
 
                         if (lease) {
                                 if (server_id) {
                                         /* SELECTING State */
-                                        DEBUG("server_id = %08x", ntohl(server_id_align));
-                                        if (server_id_align == server_config.server && requested
-                                         && requested_align == lease->yiaddr
+                                        DEBUG("server_id = %08x", ntohl(server_id_aligned));
+                                        if (server_id_aligned == server_config.server
+                                         && requested
+                                         && requested_aligned == lease->yiaddr
                                         ) {
                                                 send_ACK(&packet, lease->yiaddr);
                                         }
                                 } else if (requested) {
                                         /* INIT-REBOOT State */
-                                        if (lease->yiaddr == requested_align)
+                                        if (lease->yiaddr == requested_aligned)
                                                 send_ACK(&packet, lease->yiaddr);
                                         else
                                                 send_NAK(&packet);
@@ -221,7 +226,7 @@ int udhcpd_main(int argc UNUSED_PARAM, char **argv)
 
                         } else if (requested) {
                                 /* INIT-REBOOT State */
-                                lease = find_lease_by_yiaddr(requested_align);
+                                lease = find_lease_by_yiaddr(requested_aligned);
                                 if (lease) {
                                         if (lease_expired(lease)) {
                                                 /* probably best if we drop this lease */
@@ -230,7 +235,7 @@ int udhcpd_main(int argc UNUSED_PARAM, char **argv)
                                         } else
                                                 send_NAK(&packet);
                                 } else {
-                                        uint32_t r = ntohl(requested_align);
+                                        uint32_t r = ntohl(requested_aligned);
                                         if (r < server_config.start_ip
                                          || r > server_config.end_ip
                                         ) {