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host-utils: move checks out of divu128/divs128

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In preparation for changing the divu128/divs128 implementations
to allow for quotients larger than 64 bits, move the div-by-zero
and overflow checks to the callers.

Signed-off-by: Luis Pires <luis.pires@eldorado.org.br>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20211025191154.350831-2-luis.pires@eldorado.org.br>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Luis Pires 2021-10-25 16:11:36 -03:00 • committed by Richard Henderson
parent 1c46937358
commit 9276a31c34
4 changed files with 42 additions and 51 deletions
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34
include/qemu/host-utils.h
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@ -52,36 +52,26 @@ static inline uint64_t muldiv64(uint64_t a, uint32_t b, uint32_t c)
return (__int128_t)a * b / c;
}
static inline int divu128(uint64_t *plow, uint64_t *phigh, uint64_t divisor)
static inline void 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;
}
__uint128_t dividend = ((__uint128_t)*phigh << 64) | *plow;
__uint128_t result = dividend / divisor;
*plow = result;
*phigh = dividend % divisor;
}
static inline int divs128(int64_t *plow, int64_t *phigh, int64_t divisor)
static inline void divs128(int64_t *plow, int64_t *phigh, int64_t divisor)
{
if (divisor == 0) {
return 1;
} else {
__int128_t dividend = ((__int128_t)*phigh << 64) | (uint64_t)*plow;
__int128_t result = dividend / divisor;
*plow = result;
*phigh = dividend % divisor;
return result != *plow;
}
__int128_t dividend = ((__int128_t)*phigh << 64) | (uint64_t)*plow;
__int128_t result = dividend / divisor;
*plow = result;
*phigh = dividend % divisor;
}
#else
void muls64(uint64_t *plow, uint64_t *phigh, int64_t a, int64_t b);
void mulu64(uint64_t *plow, uint64_t *phigh, 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);
void divu128(uint64_t *plow, uint64_t *phigh, uint64_t divisor);
void divs128(int64_t *plow, int64_t *phigh, int64_t divisor);
static inline uint64_t muldiv64(uint64_t a, uint32_t b, uint32_t c)
{