Browse Prior Art Database

Program Slicing

IP.com Disclosure Number: IPCOM000075294D
Original Publication Date: 1971-Aug-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Doehle, L: AUTHOR [+4]

Abstract

To utilize the free locations in the screen buffer of a display unit for the execution of microprograms of a connected processor, most of the micro-instructions can be executed in these locations, provided the screen buffer is directly hardware controlled. To this end, it is also essential that only those micro-instructions are transferred to the screen buffer which are not displayable on account of their bit pattern.

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Program Slicing

To utilize the free locations in the screen buffer of a display unit for the execution of microprograms of a connected processor, most of the micro- instructions can be executed in these locations, provided the screen buffer is directly hardware controlled. To this end, it is also essential that only those micro-instructions are transferred to the screen buffer which are not displayable on account of their bit pattern.

Since it is generally not possible to use only undisplayable instructions in a microprogram, displayable instructions have to be executed outside the screen buffer.

The figure shows that program slicing is possible by two instruction address registers IAR X and IAR Y which are permanently associated with a storage, the screen buffer or buffer X.

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