Subject: Re: Followup: MCHK exception in -current with MMU off
To: Tim Kelly <>
From: Matt Thomas <>
List: port-powerpc
Date: 04/11/2005 12:48:48
Tim Kelly wrote:
> At 2:49 PM -0400 4/11/05, Tim Kelly wrote:
>>Not that GENERIC isn't stable with
>>Altivec, but on a memory access instead of a floating point calculation, I
>>didn't think that this optimization would be that important.  I wasn't
>>aware that Altivec will access memory faster than the GPRs.
> That wasn't intended to be flippant, but a literal statement.  If Altivec
> does access memory faster than GPRs, I'd like to know this.

It does.  And it has less cache side effects.  If it wasn't faster, I
would not have added support for using it to do that.

Matt Thomas                     email:
3am Software Foundry              www:
Cupertino, CA              disclaimer: I avow all knowledge of this message.