System to determine if modification of first macroinstruction to

Details System to determine if modification of first macroinstruction to System to determine if modification of first macroinstruction to

1992-08-05

1993-02-09

Lee, Thomas C.

Boots, shoes, and leggings

3642627, 3642628, 3642630, 3642631, 364DIG1, G06F 9318

Patent

active

051858703

ABSTRACT:
A method and mechanism for shortening the execution time of certain macro-instructions by looking at both a present macro-instruction and a next macro-instruction. The invention includes two, interrelated aspects for accomplishing this. First, a first operation of a next macro-instruction is performed concurrently with a last operation of a current macro-instruction. Second, the next macro-instruction is decoded to determine the minimum number of clock cycles it requires. If this minimum number is below a specified number, the micro operations of the present instruction are modified to perform appropriate set-up operations for the next macro-instruction to enable it to be completed in the computed minimum number of clock cycles.

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IBM Technical Disclosure Bulletin, vol. 22, No. 9, Feb. 1980, "Partial Duplex Decode and Execution of Instructions," D. T. Shen and R. E. Miller.

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