0:00000000:00001010110111111111111-0:00000001:10101000010000000000000is 1:00000000:10011101011000000000001. Correct answer should be 1:00000001:10011101011000000000001
0:00000010:00000010001010000000001-0:00000001:00000000000000000000000is 0:00000000:00000100010100000000010. Correct answer should be 0:00000001:00000100010100000000010
incorrect exponent
use testcases/ibm/add-shift-and-special-significand.txt
incorrect exponent
use testcases/ibm/add-shift-and-special-significand.txt