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| author | Orit Wasserman <owasserm@redhat.com> | 2012-08-06 21:42:52 +0300 |
|---|---|---|
| committer | Juan Quintela <quintela@redhat.com> | 2012-08-08 13:51:12 +0200 |
| commit | 302dfbeb21fc5154c24ca50d296e865a3778c7da (patch) | |
| tree | dc58664ea559e0482b8304d26fdf87aee1b9e1b8 /migration.h | |
| parent | e6546bb938f5326269b6669d6cbb44d72458caa4 (diff) | |
| download | qemu-302dfbeb21fc5154c24ca50d296e865a3778c7da.tar.gz qemu-302dfbeb21fc5154c24ca50d296e865a3778c7da.tar.bz2 qemu-302dfbeb21fc5154c24ca50d296e865a3778c7da.zip | |
Add xbzrle_encode_buffer and xbzrle_decode_buffer functions
For performance we are encoding long word at a time.
For nzrun we use long-word-at-a-time NULL-detection tricks from strcmp():
using ((lword - 0x0101010101010101) & (~lword) & 0x8080808080808080) test
to find out if any byte in the long word is zero.
Signed-off-by: Benoit Hudzia <benoit.hudzia@sap.com>
Signed-off-by: Petter Svard <petters@cs.umu.se>
Signed-off-by: Aidan Shribman <aidan.shribman@sap.com>
Signed-off-by: Orit Wasserman <owasserm@redhat.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Diffstat (limited to 'migration.h')
| -rw-r--r-- | migration.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/migration.h b/migration.h index 713aae0253..743c366149 100644 --- a/migration.h +++ b/migration.h @@ -100,4 +100,8 @@ void migrate_add_blocker(Error *reason); */ void migrate_del_blocker(Error *reason); +int xbzrle_encode_buffer(uint8_t *old_buf, uint8_t *new_buf, int slen, + uint8_t *dst, int dlen); +int xbzrle_decode_buffer(uint8_t *src, int slen, uint8_t *dst, int dlen); + #endif |