diff options
| -rw-r--r-- | firmware/asm/ffs.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/firmware/asm/ffs.c b/firmware/asm/ffs.c index 6826f42e94..a4512e0c55 100644 --- a/firmware/asm/ffs.c +++ b/firmware/asm/ffs.c @@ -35,7 +35,8 @@ int find_first_set_bit(uint32_t val) if (val == 0) return 32; - /* __builtin_ffs(l(l)): Returns one plus the index of the least significant - 1-bit of x, or if x is zero, returns zero. */ - return __builtin_ffs(val) - 1; + /* __builtin_ctz[l[l]]: Returns the number of trailing 0-bits in x, + * starting at the least significant bit position. If x is 0, the result + * is undefined. */ + return __builtin_ctz(val); } |