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optimize 16- and 32-bit moves

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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
This commit is contained in:
Denis Vlasenko
2008-12-08 22:56:18 +00:00
parent d1a84a2880
commit efb545b9bd
13 changed files with 97 additions and 77 deletions
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5
archival/libunarchive/decompress_unzip.c
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@@ -1083,8 +1083,7 @@ static uint16_t buffer_read_le_u16(STATE_PARAM_ONLY)
{
uint16_t res;
#if BB_LITTLE_ENDIAN
/* gcc 4.2.1 is very clever */
memcpy(&res, &bytebuffer[bytebuffer_offset], 2);
move_from_unaligned16(res, &bytebuffer[bytebuffer_offset]);
#else
res = bytebuffer[bytebuffer_offset];
res |= bytebuffer[bytebuffer_offset + 1] << 8;
@@ -1097,7 +1096,7 @@ static uint32_t buffer_read_le_u32(STATE_PARAM_ONLY)
{
uint32_t res;
#if BB_LITTLE_ENDIAN
memcpy(&res, &bytebuffer[bytebuffer_offset], 4);
move_from_unaligned32(res, &bytebuffer[bytebuffer_offset]);
#else
res = bytebuffer[bytebuffer_offset];
res |= bytebuffer[bytebuffer_offset + 1] << 8;