#if defined(__x86_64__) | |
inline uint64_t Divide128Div64To64(uint64_t high, uint64_t low, | |
uint64_t divisor, uint64_t* remainder) { | |
uint64_t result; | |
__asm__("divq %[v]" | |
: "=a"(result), "=d"(*remainder) // Ouput parametrs, =a for rax, =d for rdx, [v] is an | |
// alias for divisor, input paramters "a" and "d" for low and high. | |
: [v] "r"(divisor), "a"(low), "d"(high)); | |
return result; | |
} | |
#endif | |
tu_int __udivmodti4(tu_int dividend, tu_int divisor, tu_int* remainder) { | |
… | |
#if defined(__x86_64__) | |
if (divisor.high == 0) { | |
remainder->high = 0; | |
if (dividend.high < divisor) { | |
uint64_t quotient = | |
Divide128Div64To64(dividend.high, dividend.low, | |
divisor.low, &remainder->low); | |
return quotient; | |
} else { | |
tu_int quotient; | |
quotient.high = Divide128Div64To64(0, dividend.high, divisor.low, | |
÷nd.high); | |
quotient.low = Divide128Div64To64(dividend.high, dividend.low, | |
divisor.low, &remainder->low); | |
return quotient; | |
} | |
} | |
#endif | |
... | |
} |
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