Variable length instructions packed in a fixed length double ins

Details Variable length instructions packed in a fixed length double ins Variable length instructions packed in a fixed length double ins

1994-07-27

1997-04-29

Harvey, Jack B.

39542104, G06F 100

Patent

active

056257848

ABSTRACT:
A structure and method for using variable length instructions in an instruction register having a fixed word boundary. The instruction register accommodates a first word and a second word. The first word has a first base instruction and a first flexible instruction aligned with first and second predetermined positions, respectively, in the instruction register. The second word has a second base instruction and a second flexible instruction aligned with third and fourth predetermined positions, respectively, in the instruction register. The first and second base instructions and the first and second flexible instructions each have a fixed length. The first base instruction can (1) stand alone as an independent instruction, (2) be combined with the first flexible instruction to form a once-extended instruction, or (3) be combined with the first and second flexible instructions to form a twice-extended instruction. The second base instruction can (1) stand alone as an independent instruction, (2) be combined with the second flexible instruction to form a once-extended instruction, or (3) be combined with the first and second flexible instructions to form a twice-extended instruction. If the first and/or second flexible instructions are not combined with the first or second base instructions, they are used as flexible independent instructions.

REFERENCES:
patent: 4654781 (1987-03-01), Schwartz et al.
patent: 5249273 (1993-09-01), Yoshitake et al.
patent: 5423012 (1995-06-01), Sato et al.
patent: 5448746 (1995-09-01), Eickemeyer et al.
patent: 5560036 (1996-09-01), Yoshida
John Hennessy & David Patterson, Computer Architecture a Quantitative Approach, 1990, pp. 150-166.
XL-8220 Processor Data Book, Weitek Corp., Sunnyvale, CA, Mar., 1990, 5 pages.

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