Boots – shoes – and leggings
Patent
1987-11-17
1990-06-12
Chan, Eddie P.
Boots, shoes, and leggings
3642613, 3642614, 3642624, G06F 930, G06F 940
Patent
active
049338471
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.
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IBM System/38 Theory-Maintenance Manual SY31-0649-2-Section 05, Theory, Beginning at p. 05-070.
Chau Vi
Frye Harold E.
Funk Mark R.
McMahon Lynn A.
Petz Bruce R.
Chan Eddie P.
Forrest Bradley A.
International Business Machines - Corporation
Kriess Kevin A.
Sirr Francis A.
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