previous | contents | next

Chapter 43 The structure of SYSTEM/360 591

Fig. 3. The data formats.

shifting, and several logical operations, can be used in address computation. A two's complement notation is used for fixed-point operands.

Additions, subtractions, multiplications, divisions, and comparisons take one operand from a register and another from either a register or storage. Multiple-precision arithmetic is made convenient by the two's complement notation and by recognition of the carry from one word to another. A pair of conversion instructions, CONVERT TO BINARY and CONVERT TO DECIMAL, provide transition between decimal and binary radices without the use of tables. Multiple-register loading and storing instructions facilitate subroutine switching.

Floating-point arithmetic

Floating-point numbers may occur in either of two fixed-length formats-short or long. These formats differ only in the length of

previous | contents | next