System for determining data dependencies among intra-bundle inst

Details System for determining data dependencies among intra-bundle inst System for determining data dependencies among intra-bundle inst

1996-06-13

1998-09-08

Kim, Kenneth S.

395376, 395391, 395393, 39580023, G06F 938

Patent

active

058058516

ABSTRACT:
A method for determining intra-bundle dependencies includes a step of pre-inserting target registers of inserting instructions into slots of an instruction queue. The target registers of the inserting instructions are compared to each other and also to the target registers of each instruction in the instruction queue. These comparisons are made to determine which instructions are the most recent writers of the target registers. The method next involves inserting source registers for the inserting instructions and comparing each slot's target register number with these source registers. If a match occurs between a slot's target register and a source register and if that slot furthermore is the most recent writer for that register, then only that slot informs the inserting instruction that the instruction depends upon it for data. The amount of additional hardware in the queue for determining intra-bundle dependencies is minimized since the intra-bundle dependencies are determined with the same set of comparators that determine dependencies between the inserting instructions and the instructions already in the queue.

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