From: Bill Schmidt <wschmidt@linux.ibm.com>
To: GT <tnggil@protonmail.com>
Cc: Tulio Magno Quites Machado Filho <tuliom@ascii.art.br>,
"libc-alpha\\\\\\\\@sourceware.org" <libc-alpha@sourceware.org>
Subject: Re: [RFC] PPC64: Vector Function ABI for Power Architecture
Date: Fri, 22 Nov 2019 15:54:19 -0600 [thread overview]
Message-ID: <412d3b9e-b678-c2e9-5442-c66178d469b0@linux.ibm.com> (raw)
In-Reply-To: <5DGkHtR15g-tQSB0PXxoBO46_LrJkTzttXytGzdAFkjL4Vh2w58FSk9MU8fh-bUd3HV_pCS_v3FpmLlK2lxJrrvaAhMXwshy6noCOQXGhMU=@protonmail.com>
On 11/22/19 3:53 PM, GT wrote:
> ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
> On Friday, November 22, 2019 4:45 PM, Bill Schmidt <wschmidt@linux.ibm.com> wrote:
>
>> On 11/22/19 2:58 PM, GT wrote:
>>
>>> ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
>>> On Friday, November 22, 2019 3:34 PM, Bill Schmidt wschmidt@linux.ibm.com wrote:
>>>
>>>> On 11/22/19 2:27 PM, Tulio Magno Quites Machado Filho wrote:
>>>>
>>>>> GT tnggil@protonmail.com writes:
>>>>>
>>>>>> 1. The document is hosted at URL: https://github.com/power8-abi-doc
>>>>>> 2. Bill Schmidt, cc'ed here, is the IBMer ultimately responsible for the document.
>>>>>>
>>>>>> The pdf does not render quite right - so for feedback regarding visual presentation of the document, first download the html and open it in a browser. Please use the ABI's rendering in a browser as the basis for any recommendations on its formatting.
>>>>>> In section "Vector Function Name Mangling", I'm afraid we can't leave the <isa>
>>>>>> with an entry as generic as VSX.
>>>>>> There are VSX instructions included in ISA 3.0 that will not execute in ISA
>>>>>> 2.07. So, I think we need 2 <isa> entries there:
>>>>> 1. ISA 2.07, which is the minimum ISA required in this document.
>>>>> 2. ISA 3.0
>>>>> We have not used any instructions introduced in ISA 3.0. Can I simply have a single
>>>>> entry indicating ISA 2.07? Or should it be ISA 2.07+ (i.e. ISA at or above v2.07)?
>>>>> Or do we still really need 2 separate entries?
>>>>>
>>> Thanks.
>>> Bert.
>> ABI decisions shouldn't be based only on the current implementation.
>> It's possible that we would later want to make use of ISA 3.0
>> instructions in a future implementation of these same interfaces.
>> Furthermore, it becomes even more likely as we move ahead into later
>> versions of the ISA. So I think it's best to be flexible and assign
>> 2.07 and 3.0 today, with the understanding that we will continue to add
>> to this as ISA levels are released.
>>
>> For today's implementations, the VSX/2.07 mangling would be the only one
>> in use, so we're not asking for any changes in the implementation.
>>
>> Thanks!
>> Bill
> Alright. I will have the assignments as:
> 'b' VSX as defined in Power ISA v2.07
> 'c' VSX as defined in Power ISA v3.0
>
> Good enough?
Works for me! Thanks!
Bill
>
> Thanks.
> Bert.
next prev parent reply other threads:[~2019-11-22 21:54 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-18 16:33 [RFC] PPC64: Vector Function ABI for Power Architecture GT
2019-11-22 20:27 ` Tulio Magno Quites Machado Filho
2019-11-22 20:34 ` Bill Schmidt
2019-11-22 20:58 ` GT
2019-11-22 21:45 ` Bill Schmidt
2019-11-22 21:53 ` GT
2019-11-22 21:54 ` Bill Schmidt [this message]
2019-11-25 13:00 ` Tulio Magno Quites Machado Filho
2020-01-15 20:04 ` GT
2020-01-27 18:43 ` GT
2020-01-27 20:42 ` Tulio Magno Quites Machado Filho
2020-02-08 20:34 ` GT
2020-02-10 21:38 ` GT
2020-02-12 17:46 ` Tulio Magno Quites Machado Filho
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