diff options
| author | Poul-Henning Kamp <phk@FreeBSD.org> | 2002-05-14 08:01:34 +0000 |
|---|---|---|
| committer | Poul-Henning Kamp <phk@FreeBSD.org> | 2002-05-14 08:01:34 +0000 |
| commit | 085559c4fc62322455543afa1bc0b4a022495560 (patch) | |
| tree | 5d20d1025f703d5764a107ed23ed71df3bba1b0e /sys/sys/blist.h | |
| parent | be1d673d24eb7656c01123fc89be9c224eb25383 (diff) | |
| download | src-085559c4fc62322455543afa1bc0b4a022495560.tar.gz src-085559c4fc62322455543afa1bc0b4a022495560.zip | |
Roll the LOG2 macro up again, I don't belive unrolling this for 64bits
make sense.
Sponsored by: DARPA & NAI Labs.
Notes
Notes:
svn path=/head/; revision=96567
Diffstat (limited to 'sys/sys/blist.h')
| -rw-r--r-- | sys/sys/blist.h | 44 |
1 files changed, 13 insertions, 31 deletions
diff --git a/sys/sys/blist.h b/sys/sys/blist.h index a26932cae89f..cb52a6a281f2 100644 --- a/sys/sys/blist.h +++ b/sys/sys/blist.h @@ -30,37 +30,19 @@ #ifndef _SYS_BLIST_H_ #define _SYS_BLIST_H_ -#define LOG2(v) (((u_daddr_t)(v) >= 0x80000000U) ? 31 : \ - ((u_daddr_t)(v) >= 0x40000000U) ? 30 : \ - ((u_daddr_t)(v) >= 0x20000000U) ? 29 : \ - ((u_daddr_t)(v) >= 0x10000000U) ? 28 : \ - ((u_daddr_t)(v) >= 0x08000000U) ? 27 : \ - ((u_daddr_t)(v) >= 0x04000000U) ? 26 : \ - ((u_daddr_t)(v) >= 0x02000000U) ? 25 : \ - ((u_daddr_t)(v) >= 0x01000000U) ? 24 : \ - ((u_daddr_t)(v) >= 0x00800000U) ? 23 : \ - ((u_daddr_t)(v) >= 0x00400000U) ? 22 : \ - ((u_daddr_t)(v) >= 0x00200000U) ? 21 : \ - ((u_daddr_t)(v) >= 0x00100000U) ? 20 : \ - ((u_daddr_t)(v) >= 0x00080000U) ? 19 : \ - ((u_daddr_t)(v) >= 0x00040000U) ? 18 : \ - ((u_daddr_t)(v) >= 0x00020000U) ? 17 : \ - ((u_daddr_t)(v) >= 0x00010000U) ? 16 : \ - ((u_daddr_t)(v) >= 0x00008000U) ? 15 : \ - ((u_daddr_t)(v) >= 0x00004000U) ? 14 : \ - ((u_daddr_t)(v) >= 0x00002000U) ? 13 : \ - ((u_daddr_t)(v) >= 0x00001000U) ? 12 : \ - ((u_daddr_t)(v) >= 0x00000800U) ? 11 : \ - ((u_daddr_t)(v) >= 0x00000400U) ? 10 : \ - ((u_daddr_t)(v) >= 0x00000200U) ? 9 : \ - ((u_daddr_t)(v) >= 0x00000100U) ? 8 : \ - ((u_daddr_t)(v) >= 0x00000080U) ? 7 : \ - ((u_daddr_t)(v) >= 0x00000040U) ? 6 : \ - ((u_daddr_t)(v) >= 0x00000020U) ? 5 : \ - ((u_daddr_t)(v) >= 0x00000010U) ? 4 : \ - ((u_daddr_t)(v) >= 0x00000008U) ? 3 : \ - ((u_daddr_t)(v) >= 0x00000004U) ? 2 : \ - ((u_daddr_t)(v) >= 0x00000002U) ? 1 : 0) +static __inline int +LOG2(u_daddr_t v) +{ + int i = -1; + + if (!v) + return(0); + while (v) { + i++; + v >>= 1; + } + return (i); +} /* * blmeta and bl_bitmap_t MUST be a power of 2 in size. |