diff options
| author | Brian Paul <[email protected]> | 2015-09-01 16:29:17 -0600 |
|---|---|---|
| committer | Brian Paul <[email protected]> | 2015-09-01 16:29:17 -0600 |
| commit | 56852e925e262c9a10454ed59a42ce12fb9c801c (patch) | |
| tree | a01d4d0d997c661bdd260d730ba4c210cc885b62 /src | |
| parent | 84dad65088147fa8c177c3e6aea20c8ae0868fde (diff) | |
util: added ffsll() function
v2: fix errant _GNU_SOURCE test, per Matt Turner.
Reviewed-by: Matt Turner <[email protected]>
Reviewed-by: Jason Ekstrand <[email protected]>
Diffstat (limited to 'src')
| -rw-r--r-- | src/gallium/auxiliary/util/u_math.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/src/gallium/auxiliary/util/u_math.h b/src/gallium/auxiliary/util/u_math.h index 7175d1d4ee8..e92f83a8109 100644 --- a/src/gallium/auxiliary/util/u_math.h +++ b/src/gallium/auxiliary/util/u_math.h @@ -389,6 +389,26 @@ unsigned ffs( unsigned u ) #define ffs __builtin_ffs #endif +#ifdef HAVE___BUILTIN_FFSLL +#define ffsll __builtin_ffsll +#else +static inline int +ffsll(long long int val) +{ + int bit; + + bit = ffs((unsigned) (val & 0xffffffff)); + if (bit != 0) + return bit; + + bit = ffs((unsigned) (val >> 32)); + if (bit != 0) + return 32 + bit; + + return 0; +} +#endif + #endif /* FFS_DEFINED */ /** |