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| author | Frediano Ziglio <freddy77@gmail.com> | 2015-01-09 11:25:20 +0000 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2015-01-14 10:38:57 +0100 |
| commit | e1660dc57c1bacb78cbe39001e58a577c927dacb (patch) | |
| tree | fa3acf5f3f68dbf3f3e1ca9465a585fc0ce1d324 | |
| parent | bee818872cd9e8c07be529f75da3e48a68bf7a93 (diff) | |
qemu-common.h: optimise muldiv64 if int128 is available
Let compiler do the job to optimise the function.
Signed-off-by: Frediano Ziglio <frediano.ziglio@huawei.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Frediano Ziglio <freddy77@gmail.com>
| -rw-r--r-- | include/qemu-common.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/include/qemu-common.h b/include/qemu-common.h index f8622141a8..644b46dcdd 100644 --- a/include/qemu-common.h +++ b/include/qemu-common.h @@ -370,6 +370,12 @@ static inline uint8_t from_bcd(uint8_t val) } /* compute with 96 bit intermediate result: (a*b)/c */ +#ifdef CONFIG_INT128 +static inline uint64_t muldiv64(uint64_t a, uint32_t b, uint32_t c) +{ + return (__int128_t)a * b / c; +} +#else static inline uint64_t muldiv64(uint64_t a, uint32_t b, uint32_t c) { union { @@ -392,6 +398,7 @@ static inline uint64_t muldiv64(uint64_t a, uint32_t b, uint32_t c) res.l.low = (((rh % c) << 32) + (rl & 0xffffffff)) / c; return res.ll; } +#endif /* Round number down to multiple */ #define QEMU_ALIGN_DOWN(n, m) ((n) / (m) * (m)) |