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Message
From: Ben A. Abderazek<ben@s...>
Date: Wed Dec 10 06:45:34 CET 2003
Subject: Fw: [openrisc] Branch Target Buffer Hardware Implementation
Thanks Kugan,>>AFIK, for this implementation, you need to decode the instruction type
first.
Do you mean that I have to add a "branch type" field in the BTB?
/Ben
----- Original Message -----
From: "#KUGAN VIVEKANANDARAJAH#" <kugan@p...>
To: "Ben A. Abderazek" <ben@i...>; "List about OpenRISC cores,free
microprocessors" <openrisc@o...>
Sent: Wednesday, December 10, 2003 3:24 PM
Subject: RE: [openrisc] Branch Target Buffer Hardware Implementation
>I know that a BTB entry may consist of: branch tag, prediction
>information, the branch target address, and instructions at the branch
>target. But, how about call and return instructions?
Call/return is predicted with a return address stack.
>Do they have also to be in the BTB ? If so, how do the fetch unit make
>difference between a call, return or branch instructions.
AFIK, for this implementation, you need to decode the instruction type
first.
Kugan
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