diff options
Diffstat (limited to 'include/qemu')
| -rw-r--r-- | include/qemu/host-utils.h | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/include/qemu/host-utils.h b/include/qemu/host-utils.h index 285c5fbab8..d4f21c947f 100644 --- a/include/qemu/host-utils.h +++ b/include/qemu/host-utils.h @@ -44,9 +44,37 @@ static inline void muls64(uint64_t *plow, uint64_t *phigh, *plow = r; *phigh = r >> 64; } + +static inline int divu128(uint64_t *plow, uint64_t *phigh, uint64_t divisor) +{ + if (divisor == 0) { + return 1; + } else { + __uint128_t dividend = ((__uint128_t)*phigh << 64) | *plow; + __uint128_t result = dividend / divisor; + *plow = result; + *phigh = dividend % divisor; + return result > UINT64_MAX; + } +} + +static inline int divs128(int64_t *plow, int64_t *phigh, int64_t divisor) +{ + if (divisor == 0) { + return 1; + } else { + __int128_t dividend = ((__int128_t)*phigh << 64) | *plow; + __int128_t result = dividend / divisor; + *plow = result; + *phigh = dividend % divisor; + return result != *plow; + } +} #else void muls64(uint64_t *phigh, uint64_t *plow, int64_t a, int64_t b); void mulu64(uint64_t *phigh, uint64_t *plow, uint64_t a, uint64_t b); +int divu128(uint64_t *plow, uint64_t *phigh, uint64_t divisor); +int divs128(int64_t *plow, int64_t *phigh, int64_t divisor); #endif /** |