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From: Aleksandar Markovic <aleksandar.m.mail@gmail.com>
To: Taylor Simpson <tsimpson@quicinc.com>
Cc: "Alessandro Di Federico" <ale@rev.ng>,
	"nizzo@rev.ng" <nizzo@rev.ng>,
	"qemu-devel@nongnu.org" <qemu-devel@nongnu.org>,
	"Niccolò Izzo" <izzoniccolo@gmail.com>
Subject: Re: QEMU for Qualcomm Hexagon - KVM Forum talk and code available
Date: Tue, 5 Nov 2019 01:05:20 +0100	[thread overview]
Message-ID: <CAL1e-=jvmJNiZR4iLDL-97qm=v+2s0cwn5YTzJQ=JZ_gwOe4tQ@mail.gmail.com> (raw)
In-Reply-To: <BYAPR02MB48863165DEE32E5C563E93F4DE650@BYAPR02MB4886.namprd02.prod.outlook.com>

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On Friday, October 25, 2019, Taylor Simpson <tsimpson@quicinc.com> wrote:

> We would like inform the you that we will be doing a talk at the KVM Forum
> next week on QEMU for Qualcomm Hexagon.  Alessandro Di Federico, Niccolo
> Izzo, and I have been working independently on implementations of the
> Hexagon target.  We plan to merge the implementations, have a community
> review, and ultimately have Hexagon be an official target in QEMU.  Our
> code is available at the links below.
> *https://github.com/revng/qemu-hexagon
> <https://github.com/revng/qemu-hexagon>*
> *https://github.com/quic/qemu <https://github.com/quic/qemu>*
> If anyone has any feedback on the code as it stands today or guidance on
> how best to prepare it for review, please let us know.

Hi, Taylor, Niccolo (and Alessandro too).

I didn't have a chance to take a look at neither the code nor the docs, but
I did attend you presentation at KVM Forum, and I found it superb and
attractive, one of the best on the conference, if not the very best.

I just have a couple of general questions:

- Regarding the code you plan to upstream, are all SIMD instructions
implemented via tcg API, or perhaps some of them remain being implemented
using helpers?

- Most of SIMD instructions can be viewed simply as several paralel
elementary operations. However, for a given SIMD instruction set, usually
not all of them fit into this pattern. For example, "horizontal add"
(addind data elements from the same SIMD register), various
"pack/unpack/interleave/merge" operations, and more general
"shuffle/permute" operations as well (here I am not sure which of these are
included in Hexagon SIMD set, but there must be some). How did you deal
with them?

- What were the most challenging Hexagon SIMD instructions you came accross
while developing your solution?


> Thanks,
> Taylor

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  parent reply	other threads:[~2019-11-05  0:06 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-25 16:26 Taylor Simpson
2019-11-01 18:29 ` Philippe Mathieu-Daudé
2019-11-04  2:35   ` Taylor Simpson
2019-11-05  0:05 ` Aleksandar Markovic [this message]
2019-11-05 16:32   ` Taylor Simpson
2019-11-12 22:52     ` Taylor Simpson
2019-11-13 10:31       ` Alex Bennée
2019-11-13 19:31         ` Taylor Simpson
2019-11-13 21:10           ` Richard Henderson
2019-11-15  0:54             ` Taylor Simpson
2019-12-17 18:14               ` Taylor Simpson
2019-12-17 18:19                 ` Thomas Huth
2019-12-17 18:21                 ` Peter Maydell
2019-12-17 18:41                   ` Philippe Mathieu-Daudé
2019-12-17 18:44                     ` Philippe Mathieu-Daudé
2019-12-18 23:50                   ` Richard Henderson
2019-11-13 21:27         ` Peter Maydell
2019-11-19  9:12       ` Philippe Mathieu-Daudé

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