IBM A22 6825-1 360instrTiming free download

File name A22_6825-1_360instrTiming.pdf

File 8360-01 Form A22-6825-1 Systems Reference Library System/360 Instruction Timing Information This bulletin contains instruction timing in- formation for all models of the 8ystem/360. For a full description of each instruction, refer to IBM 8ystem/360 Principles of Operation, Form A22-6821. MAJOR REVISION (May 1964) This publication, Form A22-6825-1, obsoletes Form A22-6825-0, N22-0133, and N22-0135. Copies of this and other IBM publications can be obtained through IBM Branch Offices. Address comments concerning the contents of this publication to: IBM Corporation, Customer Manuals, Dept. 898, PO Box 390, Poughkeepsie, N.Y. 12602 SYSTEM/360 INSTRUCTION TIMING INFORMATION The instruction time tables presented in this bulletin 2. In all storage operations, positive and negative provide average instruction times, in microseconds, operands are equally probable. f~r all models of the IBM System/360. All times for 3. Each bit location has equal probability for the instructions that reference storage include the time binary values 0 or 1, and each bit location is required to perform single indexing by one general independent of other bit locations. Decimal data register as referenced in the instruction (i. e., B 1= 0) . may contain digit values 0 to 9 in eaoh digit For those instructions in which indexing may be per- position with equal probability. formed two times (i. e. , all RX format instructions), 4. Variable field length instructions may start on the time required for the second indexing must be even or odd halfwords with equal probability. added to the basic time given in the table, as follows: 5. Interruptions or masked-off program exceptions are not reflected in these timings. MODEL ADDITIONAL TIME (in microseconds) TIMING ASSUMPTIONS 30 6.0 40 1.25 SO 0.5 The following assumptions were used in the devel- 60 0.125 opment of these instruction time tables. 62 0.125 70 0.0 1. For decimal-add and decimal-subtract instruc- tions, the first operand (i. e. , the destination The instructions that may be indexed a second field) is assumed to be greater than, or equal time are highlighted by an asterisk in the table. to, the lengt