diff options
| -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 8bd4526cb6f..f2709abc9fd 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 |