diff options
| author | Francisco Jerez <currojerez@riseup.net> | 2010-02-02 03:07:08 -0800 |
|---|---|---|
| committer | Brian Paul <brianp@vmware.com> | 2010-02-02 08:53:57 -0700 |
| commit | 88593fff492e345b28720067ce0aadb988e86a28 (patch) | |
| tree | 114eff801d53dffae4676dee3c6fa89d13f435ed | |
| parent | 4778f46bb52f26f255eca87fe3d2fcc9bb71f13a (diff) | |
mesa: Add a BITSET_FFS function.
It will be useful for the nouveau DRI driver and IMHO there's no
reason to keep it private.
Signed-off-by: Brian Paul <brianp@vmware.com>
| -rw-r--r-- | src/mesa/main/bitset.h | 25 |
1 files changed, 24 insertions, 1 deletions
diff --git a/src/mesa/main/bitset.h b/src/mesa/main/bitset.h index 8bd4526cb6..f2709abc9f 100644 --- a/src/mesa/main/bitset.h +++ b/src/mesa/main/bitset.h @@ -27,7 +27,12 @@ * \brief Bitset of arbitrary size definitions. * \author Michal Krol */ - + +#ifndef BITSET_H +#define BITSET_H + +#include "imports.h" + /**************************************************************************** * generic bitset implementation */ @@ -74,6 +79,23 @@ ((x)[BITSET_BITWORD(b)] &= ~BITSET_RANGE(b, e)) : \ (assert (!"BITSET_CLEAR_RANGE: bit range crosses word boundary"), 0)) +/* Get first bit set in a bitset. + */ +static INLINE int +__bitset_ffs(const BITSET_WORD *x, int n) +{ + int i; + + for (i = 0; i < n; i++) { + if (x[i]) + return _mesa_ffs(x[i]) + BITSET_WORDBITS * i; + } + + return 0; +} + +#define BITSET_FFS(x) __bitset_ffs(x, Elements(x)) + /**************************************************************************** * 64-bit bitset implementation */ @@ -120,3 +142,4 @@ ((x)[BITSET64_BITWORD(b)] &= ~BITSET64_RANGE(b, e)) : \ (assert (!"BITSET64_CLEAR_RANGE: bit range crosses word boundary"), 0)) +#endif |