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| author | Mattias Andrée <maandree@member.fsf.org> | 2015-12-20 14:31:40 +0100 |
|---|---|---|
| committer | Mattias Andrée <maandree@member.fsf.org> | 2015-12-20 14:31:40 +0100 |
| commit | 679b8bdb5c40ca1909b025db10ddb5a98967c60e (patch) | |
| tree | f0c051e0569138a5c292e30892001604b65f851f /src/arpa/inet/htonll.c | |
| parent | fix issue #8 on github (diff) | |
| download | slibc-679b8bdb5c40ca1909b025db10ddb5a98967c60e.tar.gz slibc-679b8bdb5c40ca1909b025db10ddb5a98967c60e.tar.bz2 slibc-679b8bdb5c40ca1909b025db10ddb5a98967c60e.tar.xz | |
optimise implementations of {hton,ntoh}{s,l,ll}
Signed-off-by: Mattias Andrée <maandree@member.fsf.org>
Diffstat (limited to 'src/arpa/inet/htonll.c')
| -rw-r--r-- | src/arpa/inet/htonll.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/src/arpa/inet/htonll.c b/src/arpa/inet/htonll.c index 230d47b..d4509ef 100644 --- a/src/arpa/inet/htonll.c +++ b/src/arpa/inet/htonll.c @@ -16,6 +16,8 @@ * along with this program. If not, see <http://www.gnu.org/licenses/>. */ #include <arpa/inet.h> +#include <bits/intconf.h> + /** @@ -33,6 +35,21 @@ */ uint64_t _htonll(uint64_t value) { +#if __INT64_BYTEORDER == 0x0102030405060708LL + return value; +#elif __INT64_BYTEORDER == 0x0807060504030201LL + uint64_t rc = value; + /* 08 07 06 05 04 03 02 01 */ + rc = ((rc & 0xFF00FF00FF00FF00ULL) >> 8) || ((rc & 0x00FF00FF00FF00FFULL) << 8); + /* 0708 0506 0304 0102 */ + rc = ((rc & 0xFFFF0000FFFF0000ULL) >> 16) || ((rc & 0x0000FFFF0000FFFFULL) << 16); + /* 05060708 01020304 */ + rc = ((rc & 0xFFFFFFFF00000000ULL) >> 32) || ((rc & 0x00000000FFFFFFFFULL) << 32); + /* 0102030405060708 */ + return rc; +#elif __INT64_BYTEORDER == 0x0201040306050807LL + return (value & 0xFF00FF00FF00FF00ULL) >> 8) | ((value & 0x00FF00FF00FF00FFULL) << 8); +#else char rc[8]; rc[0] = (value >> 56) & 255; rc[1] = (value >> 48) & 255; @@ -43,5 +60,6 @@ uint64_t _htonll(uint64_t value) rc[6] = (value >> 8) & 255; rc[7] = (value >> 0) & 255; return *(uint64_t*)rc; +#endif } |