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Re: Why Thumb-2 only allows very limited access to the PC?

From: Paul Brook <paul at codesourcery dot com>
To: gcc at gcc dot gnu dot org
Cc: Carrot Wei <carrot at google dot com>, Richard Earnshaw <rearnsha at arm dot com>
Date: Wed, 6 Jan 2010 18:26:51 +0000
Subject: Re: Why Thumb-2 only allows very limited access to the PC?
References: <7587b291001042342m1f5437faib94c55b20792f5d2@mail.gmail.com> <1262689598.29813.4.camel@e200601-lin.cambridge.arm.com> <7587b291001060028q55a91b90jfff775cef44bd69e@mail.gmail.com>

On Wednesday 06 January 2010, Carrot Wei wrote:
> So thumb2 can also use the instructions similar to thumb1, right? It
> potentially has better performance and smaller code size.

Technically yes, however in ARMv7 the relevant instruction (add.n <reg>, pc) 
is deprecated.

Paul

Follow-Ups:
- Re: Why Thumb-2 only allows very limited access to the PC?
  - From: Carrot Wei
- Re: Why Thumb-2 only allows very limited access to the PC?
  - From: Richard Earnshaw

References:
- Why Thumb-2 only allows very limited access to the PC?
  - From: Carrot Wei
- Re: Why Thumb-2 only allows very limited access to the PC?
  - From: Richard Earnshaw
- Re: Why Thumb-2 only allows very limited access to the PC?
  - From: Carrot Wei

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