Addition of two 64-bit integer or fractional values, returning a 64-bit result.
Word64 __LL_add(Word64 src_dst, Word64 src2)
long long s1 = 0x3579BDEF00000000; long long s2 = 0xA864213500000000; long long result; result = L_add (s1, s2); // Expected value of result: 0x3579BDEF00000000 + 0xA864213500000000 = 0xDDDDDF2400000000