diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/qemu/host-utils.h | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/include/qemu/host-utils.h b/include/qemu/host-utils.h index 95cf4f4163..6c6005f5cf 100644 --- a/include/qemu/host-utils.h +++ b/include/qemu/host-utils.h @@ -369,13 +369,16 @@ static inline bool is_power_of_2(uint64_t value) return !(value & (value - 1)); } -/* round down to the nearest power of 2*/ -static inline int64_t pow2floor(int64_t value) +/** + * Return @value rounded down to the nearest power of two or zero. + */ +static inline uint64_t pow2floor(uint64_t value) { - if (!is_power_of_2(value)) { - value = 0x8000000000000000ULL >> clz64(value); + if (!value) { + /* Avoid undefined shift by 64 */ + return 0; } - return value; + return 0x8000000000000000ull >> clz64(value); } /* round up to the nearest power of 2 (0 if overflow) */ |