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                                                File 8360-01
                                                Form A22-6825-0




Systems Reference Library




System/360 Instruction Timing Information


This bulletin contains instruction timing in-
formation for all models of the System/360.
For full description of each instruction,
refer to IBM 8ystem/360 Principles of
Operation, Form A22-6821.
                                                          SySTEM/360 INSTRUCTION TIMING INFORMATION


These instruction time tables provide average in-              field) is assumed to be greater than, or equal
struction times, in microseconds, for all models of            to, the length of the second operand (i. e. , the
the IBM System/360. All times for instructionE:1               source field).
that reference storage include the time required to
perform single indexing by one general register as        2.   For decimal-add and decimal-subtract instruc-
referenced in the instruction (i. e., B 1- 0). For             tions, recomplementation tini.e is not included
those instructions in which indexing may be per-               in the time s given.
formed two times (i. e. , all RX format instructions),
the time required for the second indexing must be         3.   In the EDIT AND MARK (EDMK) instruction,
added to the basic time given in the table, as follows:        an address is stored once. That is, this in-
                                                               struction is used with a single field, or a line
     MODEL         ADDmONAL TIME (in microseconds)             with only one numeric field rather than a com-
                                                               plete print line.
       30                6.0
      40                 1.25
                                                          4.   In the TRANSLATE AND TEST (TRT) instruc-
      SO                ~        0-5
      60                 0.125                                 tion, it is assumed that a non -zero byte from
      62                 0.125                                 the Translate and Test table is found.
      70                 0.0


    The instructions that may be indexed a second
time are highlighted by an asterisk in the table.         FLOATING POINT INSTRUCTIONS
    The follOwing assumptions were used in the
development of these instruction times tables.            The instruction times for the floating-point instruc-
                                                          tions depend upon the number of hexadecimal digits
                                                          that are preshifted and postshifted, as well as the
VARIABLE FIELD LENGTH INSTRUCTIONS                        number of times recomplementation -of a result
                                                          occurs. The times given in the instruction time
1.   For decimal-add and decimal-subtract instruc-        tables for floating point instructions are a weighted
     tions, the first operand (i. e., the destination     average of these variables.




                                                                                                                   3
                                                                                            SYSTEM/360

                                                                                                                                       MODEL
                                                                                    30                      40                 50               60            62             70
                          INSTRUCTION              FORMAT MNEt.IONIC               Time                   Time                Time             Time          Time           Time
                                                                                   Blo                    Blo                 Blo              BlO           BIO            B#O

;4-        .Add                                     RR       AR     ./                29.    /p

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