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Re: powerpc & unaligned block moves with fp registers
- To: DJ Delorie <dj at redhat dot com>
- Subject: Re: powerpc & unaligned block moves with fp registers
- From: Dale Johannesen <dalej at apple dot com>
- Date: Fri, 2 Nov 2001 10:45:41 -0800
- Cc: Dale Johannesen <dalej at apple dot com>, dje at watson dot ibm dot com, zack at codesourcery dot com, gcc at gcc dot gnu dot org
On Friday, November 2, 2001, at 10:27 AM, DJ Delorie wrote:
>
>> 1) No DImode FPRs.
>> 2) Strictly aligned FPRs
>> 3) Word-aligned FPRs
>> 4) Arbitrary alignment FPRs.
>>
>> Dale and I want 3, which is the recommendation for PowerPC. DJ
>> wants 2. You want 1.
>
> Sigh. DJ wants 3, not 2. That's what PPC chips support in hardware,
> right?
Not quite; as David pointed you will get an exception if the fetch
crosses a page boundary. Most of the time you won't.