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From: #KUGAN VIVEKANANDARAJAH#<kugan@p...>
Date: Wed Dec 10 07:24:13 CET 2003
Subject: [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