只需使用16位数字。
void multiply(uint32_t a, uint32_t b, uint32_t* h, uint32_t* l) {
uint32_t const base = 0x10000;
uint32_t al = a%base, ah = a/base, bl = b%base, bh = b/base;
*l = al*bl;
*h = ah*bh;
uint32_t rlh = *l/base + al*bh;
*h += rlh/base;
rlh = rlh%base + ah*bl;
*h += rlh/base;
*l = (rlh%base)*base + *l%base;
}
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