Rocksolid Light - comp.lang.asm.x86 - Re: Copying low 16 bytes of YMM register to the high 16 bytes

Copying low 16 bytes of YMM register to the high 16 bytes

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From: robert@nospicedham.prino.org (Robert Prins)
Newsgroups: comp.lang.asm.x86
Subject: Copying low 16 bytes of YMM register to the high 16 bytes
Date: Sun, 12 Nov 2023 22:50:17 +0000
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by: Robert Prins - Sun, 12 Nov 2023 22:50 UTC

Or is there a way to immediately load a full YMM register with two copies of of
a 16 byte variable?

I've been looking at the various PSHUFxxx instructions, but they seem to stare
me in the face like Edgar Allan Poe's "Stolen letter"...

Thanks,

Robert
--
Robert AH Prins
robert(a)prino(d)org
The hitchhiking grandfather - https://prino.neocities.org/
Some REXX code for use on z/OS - https://prino.neocities.org/zOS/zOS-Tools.html

Re: Copying low 16 bytes of YMM register to the high 16 bytes

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From: branimir.maksimovic@nospicedham.icloud.com (Branimir Maksimovic)
Newsgroups: comp.lang.asm.x86
Subject: Re: Copying low 16 bytes of YMM register to the high 16 bytes
Date: Mon, 13 Nov 2023 02:59:34 GMT
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by: Branimir Maksimovic - Mon, 13 Nov 2023 02:59 UTC

On 2023-11-12, Robert Prins <robert@nospicedham.prino.org> wrote:
> Or is there a way to immediately load a full YMM register with two copies of of
> a 16 byte variable?
>
> I've been looking at the various PSHUFxxx instructions, but they seem to stare
> me in the face like Edgar Allan Poe's "Stolen letter"...
>
> Thanks,
>
> Robert
VBROADCASTI128 is instuction you need.

7-77-777, Evil Sinner!
https://www.linkedin.com/in/branimir-maksimovic-6762bbaa/

Re: Copying low 16 bytes of YMM register to the high 16 bytes

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From: robert@nospicedham.prino.org (Robert Prins)
Newsgroups: comp.lang.asm.x86
Subject: Re: Copying low 16 bytes of YMM register to the high 16 bytes
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by: Robert Prins - Mon, 13 Nov 2023 12:18 UTC

On 2023-11-13 02:59, Branimir Maksimovic wrote:
> On 2023-11-12, Robert Prins <robert@nospicedham.prino.org> wrote:
>> Or is there a way to immediately load a full YMM register with two copies of
>> of a 16 byte variable?
>>
>> I've been looking at the various PSHUFxxx instructions, but they seem to
>> stare me in the face like Edgar Allan Poe's "Stolen letter"...

> VBROADCASTI128 is instruction you need.

Thanks! ...but given that my program must also run on an AMD Bulldozer CPU, I'm
SOL, I'll just have to double the data I'm loading. C'est la vie.

Robert
--
Robert AH Prins
robert(a)prino(d)org
The hitchhiking grandfather - https://prino.neocities.org/
Some REXX code for use on z/OS - https://prino.neocities.org/zOS/zOS-Tools.html

Pray to God, but keep rowing to shore. -- Russian Proverb

devel / comp.lang.asm.x86 / Re: Copying low 16 bytes of YMM register to the high 16 bytes

Subject	Author
Copying low 16 bytes of YMM register to the high 16 bytes	Robert Prins
Copying low 16 bytes of YMM register to the high 16 bytes	Branimir Maksimovic
Copying low 16 bytes of YMM register to the high 16 bytes	Robert Prins