Operand dependency tracking system and method for a processor th

Details Operand dependency tracking system and method for a processor th Operand dependency tracking system and method for a processor th

1996-05-31

1998-05-05

Treat, William M.

395393, 395563, 39580023, G06F 900

Patent

active

057489343

ABSTRACT:
An operand dependency tracking system tracks operand dependencies among instructions in a processor that executes instructions out of order and that permits processing of multiple precision data words. Instructions are forwarded from an instruction fetch mechanism to a reordering mechanism, where the instructions are permitted to execute out of order. While instructions are executed in the reordering mechanism, the operand dependency tracking system is configured to perform the following: (a) detect a dependent instruction that depends upon one or more operands to be produced by a producer instruction; (b) prevent execution of the dependent instruction until after the producer instruction launches execution; (c) store a plurality of valid bits in a result register for storing a result of execution of the producer instruction, each of the valid bits corresponding with a data portion to be stored within the result register and indicative of whether each data portion is either valid or invalid; (d) launch execution of the dependent instruction after the producer instruction has already launched execution; (e) when executing the dependent instruction, determine if the operand(s) is valid based upon the valid bit(s); (f) when the operand(s) is invalid, abort execution of the dependent instruction and repeats steps (d) and (e) until the operand(s) is valid; and (g) when the operand(s) is valid, permit completion of the execution of the operand(s) by an execution unit.

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