##### Synopsis

    #include <cruntime.h>
    int64_t __int64_mul(int64_t *muliplicand, int64_t multiplier);

##### Description

__int64_mul_asgn updates the 64-bit signed integer pointed to by multiplicand by multiplying it by multiplier. The product is returned as the result. As only the lower 64 bits of the product are returned, __int64_mul returns correct products, modulo 64 bits, for both signed and unsigned arguments.

##### Portability

__int64_mul_asgn may not be provided on all implementations of CrossWorks.