The alternate math package gives you the smallest and fastest programs possible without a coprocessor. However, the program results are not as accurate as results given by the emulator package. In addition, the alternate math package does not support the long double type.
The alternate math package uses the same format as the IEEE standard-format numbers with less precision and weaker error checking. The alternate math package does not support infinities, NANs (“not a number”), and denormal numbers.