Method and system for processing multiple branch instructions th

Details Method and system for processing multiple branch instructions th Method and system for processing multiple branch instructions th

1995-06-07

1999-08-24

Lall, Parshotam S.

395586, G06F 942

Patent

active

059434945

ABSTRACT:
A system and method for processing count and link branch instructions that allows multiple branches to be outstanding at the same time without being limited to the number of rename registers allocated to the count and link registers. The method and system comprises an architected count register and an architected link register that are each connected to a look-ahead register. Information in the architected count or link register is copied into the look-ahead register when a branch instruction is encountered that will alter the contents of the count or link registers. Information in the look-ahead register is saved in a shadow register when an unresolved branch is encountered, and restored by the shadow register if the outcome of the unresolved branch is mispredicted.

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