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From: Palmer Dabbelt <palmer@dabbelt.com>
To: jeffreyalaw@gmail.com
Cc: christoph.muellner@vrull.eu, binutils@sourceware.org,
	nelson@rivosinc.com, Andrew Waterman <andrew@sifive.com>,
	Jim Wilson <jim.wilson.gcc@gmail.com>,
	philipp.tomsich@vrull.eu, jbeulich@suse.com,
	Kito Cheng <kito.cheng@gmail.com>,
	research_trasio@irq.a4lg.com
Subject: Re: [RFC PATCH v5] RISC-V: Add support for the Zfa extension
Date: Thu, 29 Jun 2023 08:52:35 -0700 (PDT)	[thread overview]
Message-ID: <mhng-d76930ac-a02e-484b-b2c6-d7fe011bee09@palmer-ri-x1c9> (raw)
In-Reply-To: <df8c42bc-661d-01be-0086-8995441ec473@gmail.com>

On Thu, 29 Jun 2023 08:49:16 PDT (-0700), jeffreyalaw@gmail.com wrote:
>
>
> On 6/29/23 09:37, Palmer Dabbelt wrote:
>
>>>> > So my understanding is that this needs to wait for ratification and is
>>>> > not blocked by the mentioned PR.
>>>> Is there something special about Zfa that makes it desirable to wait for
>>>> ratification as opposed to standard practice of gating things as the
>>>> specs get to a Frozen state?
>>>
>>> Not to my knowledge.
>>
>> Waiting for ratification is probably a bad idea, there's really no way
>> to schedule around it.  That's a big part of the reason we've just
>> waited for frozen.
> Exactly.  ISTM that frozen is the right point to trigger.
>
>>
>> IIUC we're just waiting on the assembler syntax to be accepted, it's not
>> an ISA problem right now.
> And I think enough of it is settled that we can move forward. If RVI
> changes the set of forms allowed, then we can adjust.

Works for me.  So

Acked-by: Palmer Dabbelt <palmer@rivosinc.com>

Presumably someone's actually looked at the code?  If not I can look 
over it...

>> It's not all that hard to just add more flavors of assembler syntax
>> later, so maybe we just merge this and stop bothering to wait for all
>> these other non-ISA specs to resolve?
> I'd be more worried about them removing a supported form as that would
> result in hand-coded assembly might needing to be adjusted.  But I
> wouldn't expect there's much hand-coded Zfa code out there.

Historically we've just kept whatever is released as a compatibility 
mechanism and then added stuff, but I guess we can sort that out when it 
comes to it.

>
> Jeff

  parent reply	other threads:[~2023-06-29 15:52 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-04-13 13:36 Christoph Muellner
2023-06-29  7:52 ` Christoph Müllner
2023-06-29  8:33   ` Christoph Müllner
2023-06-29 15:07   ` Jeff Law
2023-06-29 15:10     ` Christoph Müllner
2023-06-29 15:37       ` Palmer Dabbelt
2023-06-29 15:49         ` Jeff Law
2023-06-29 15:51           ` Philipp Tomsich
2023-06-30 13:40             ` Jeff Law
2023-06-30 14:06               ` Jeff Law
2023-06-30 14:08                 ` Philipp Tomsich
2023-06-30 14:39                   ` Jeff Law
2023-06-29 15:52           ` Palmer Dabbelt [this message]
2023-06-29 16:03             ` Jeff Law
2023-06-29 16:12               ` Palmer Dabbelt
2023-06-30 14:07                 ` Philipp Tomsich
2023-06-30  0:47             ` Nelson Chu
2023-06-30  6:49               ` Kito Cheng
2023-06-30 13:38               ` Jeff Law

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