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Re: [OFF-TOPIC] Cobalt 64-bit, what for? (was: 64-bit fix)

To: Ralf Baechle <>
Subject: Re: [OFF-TOPIC] Cobalt 64-bit, what for? (was: 64-bit fix)
From: Dominic Sweetman <>
Date: Fri, 15 Apr 2005 11:18:08 +0100
Cc: Dominique Quatravaux <>, Peter Horton <>,
In-reply-to: <>
Original-recipient: rfc822;
References: <20050414185949.GA5578@skeleton-jack> <> <>
Ralf Baechle ( writes:

> > And doesn't 64 bit mode have costs of its own (doubled i-fetch bandwidth
> > for starters)?

64-bit MIPS CPUs still have 32-bit instructions... it's the registers
and addressing range which grow, not the instructions.

Program data segments tend to grow when you use 64-bit pointers (N64
does, but N32 - paradoxically still a 64-bit ABI - doesn't)

Dominic Sweetman
MIPS Technologies

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