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Re: powerpc & unaligned block moves with fp registers

From: Mike Stump <mrs at apple dot com>
To: Dale Johannesen <dalej at apple dot com>
Cc: David Edelsohn <dje at watson dot ibm dot com>, dj at redhat dot com, gcc at gcc dot gnu dot org
Date: Fri, 31 Oct 2003 23:02:21 -0800
Subject: Re: powerpc & unaligned block moves with fp registers

On Friday, October 31, 2003, at 02:45 PM, Dale Johannesen wrote:

On Friday, October 31, 2003, at 07:47 AM, David Edelsohn wrote:
1. Do we *ever* want to use fp regs for unaligned mem-mem moves?  Is
   there any 32-bit PPC chip where an unaligned 64-bit fp move is
   faster than two (maybe unaligned, maybe mot) 32-bit moves?
What about volatile?
I don't believe 'volatile' requires atomic accesses. You can have objects of volatile-qualified struct types, and can copy them.

We should be very careful to not remove `working' and reasonable semantics that are widely implemented and depended on by existing code, just because some standard can be read in such a way that suggest that something might not be mandated to work.

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