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Re: Register classes

From: Daniel Berlin <dberlin at dberlin dot org>
To: James E Wilson <wilson at specifixinc dot com>
Cc: gcc at gcc dot gnu dot org
Date: Thu, 19 Aug 2004 22:07:34 -0400
Subject: Re: Register classes
References: <8E09A612-F13D-11D8-AC31-000A95DA505C@dberlin.org> <4125598A.6030305@specifixinc.com>

On Aug 19, 2004, at 9:53 PM, James E Wilson wrote:

Daniel Berlin wrote:
A whole lot of ports seem to have register classes that contain registers that can't possibly be used together. They also have to seem weird groupings of registers that don't make sense to be used by any single pseudo.
This is because of interactions between the register preferences computed by regclass and the register allocator.

IOW, it's done to try to get better performance out of the register allocator. :) --Dan

References:
- Register classes
  - From: Daniel Berlin
- Re: Register classes
  - From: James E Wilson

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