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| author | marha <marha@users.sourceforge.net> | 2012-09-14 11:09:08 +0200 |
|---|---|---|
| committer | marha <marha@users.sourceforge.net> | 2012-09-14 11:09:08 +0200 |
| commit | b08ba56019b146786e1cde553c036dd0c4fd02e5 (patch) | |
| tree | 651ada0a32bd95a5c80838f11d31205c8d3e8807 /mesalib/src/mesa/main/imports.h | |
| parent | aa10a08696cae93799fcddae3f0245ceee905e01 (diff) | |
| download | vcxsrv-b08ba56019b146786e1cde553c036dd0c4fd02e5.tar.gz vcxsrv-b08ba56019b146786e1cde553c036dd0c4fd02e5.tar.bz2 vcxsrv-b08ba56019b146786e1cde553c036dd0c4fd02e5.zip | |
fontconfig libX11 mesa xkeyboard-config git update 14 sep 2012
Diffstat (limited to 'mesalib/src/mesa/main/imports.h')
| -rw-r--r-- | mesalib/src/mesa/main/imports.h | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/mesalib/src/mesa/main/imports.h b/mesalib/src/mesa/main/imports.h index abf216c99..81da51047 100644 --- a/mesalib/src/mesa/main/imports.h +++ b/mesalib/src/mesa/main/imports.h @@ -520,6 +520,28 @@ extern unsigned int _mesa_bitcount_64(uint64_t n); #endif +/** + * Find the last (most significant) bit set in a word. + * + * Essentially ffs() in the reverse direction. + */ +static inline unsigned int +_mesa_fls(unsigned int n) +{ +#if defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 304) + return n == 0 ? 0 : 32 - __builtin_clz(n); +#else + unsigned int v = 1; + + if (n == 0) + return 0; + + while (n >>= 1) + v++; + + return v; +#endif +} extern GLhalfARB _mesa_float_to_half(float f); |