Prefix instruction for modification of a subsequent instruction

Details Prefix instruction for modification of a subsequent instruction Prefix instruction for modification of a subsequent instruction

1993-01-14

1994-04-12

Harrell, Robert B.

Boots, shoes, and leggings

3642612, 3642474, 36423223, 3649467, 364263, 3649483, 364DIG1, 395400, 395800, G06F 930, G06F 934

Patent

active

053033582

ABSTRACT:
A method and apparatus for instruction prefixing selectively reconfigures certain of the instructions in the microprocessor's instruction set so as to alter the nature of the operation performed by the instruction and/or the designation of operand or result locations accessed by the operation. A prefix instruction is inserted ahead of a "using" instruction and an operational parameter of the using instruction is modified in accordance with the contents of the prefix instruction. In one application, the prefix instruction may be used to specify a register location for storage of a result of the using instruction's operation or retrieval of an operand. In other applications, the prefix instruction may be used to modify other aspects of instruction execution.

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"iAPX 86/88, 186/188 User's Manual, Hardware Reference", Intel, 1985, pp. 1-6 to 1-10, 1-19, 1-20, 1-53.

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