The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 12, 1990
Filed:
Nov. 17, 1987
Vi Chau, Rochester, MN (US);
Harold E Frye, Poughkeepsie, N;
Mark R Funk, Rochester, MN (US);
Lynn A McMahon, Rochester, MN (US);
Bruce R Petz, Rochester, MN (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A microcode branch, to one of a number of possible control words (sixteen control words are described), is based upon (1) the remaining operand length that is to be processed by a left to right instruction, and (2) by the byte alignment of the portion of the operand that currently resides in main storage interface registers. As a left to right instruction is being executed, the operand's new length and its new alignment, as they both will exist after a control word is executed, are determined. The new length and the new alignment are used to determine the addess of the next control word. A 16-way branch instruction has branch legs that are determined by the number of operand bytes that are left to be processed, and by the alignment of two operands in two storage registers that interface with main storage. This method and arrangement for microcode branching maximizes the amount of data that can be processed per processor cycle by the hardware upon execution of a left to right instruction.