Subject: Re: -mstrict-align on powerpc
To: Jason Thorpe <>
From: Matt Thomas <>
List: tech-toolchain
Date: 03/16/2003 12:19:33
At 11:48 AM 3/16/2003, Jason Thorpe wrote:

>On Sunday, March 16, 2003, at 10:41  AM, Nathan J. Williams wrote:
>>Why? The performance of unaligned fetches always sucks, even when they
>>don't trap. I think we should be going the other way: actively
>>preventing, if not forbidding, unaligned data structures even on CPUs
>>that don't require alignment, to improve performance.
>Is unaligned access really that bad on PowerPC CPUs that can do it?

No.  It's almost as fast aligned accesses.

Matt Thomas               Internet:
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Cupertino, CA             Disclaimer: I avow all knowledge of this message