linux-kernel - Re: [PATCH] x86: XOP prefix instructions decoder support

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Message-Id: <20250820100004.15a49b907b334e821f0a0e73@kernel.org>
Date: Wed, 20 Aug 2025 10:00:04 +0900
From: Masami Hiramatsu (Google) <mhiramat@...nel.org>
To: "H. Peter Anvin" <hpa@...or.com>
Cc: "Alan J . Wylie" <alan@...ie.me.uk>, Josh Poimboeuf
 <jpoimboe@...nel.org>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar
 <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, Dave Hansen
 <dave.hansen@...ux.intel.com>, linux-kernel@...r.kernel.org,
 regressions@...ts.linux.dev, stable@...r.kernel.org, Linus Torvalds
 <torvalds@...ux-foundation.org>, x86@...nel.org
Subject: Re: [PATCH] x86: XOP prefix instructions decoder support

On Sat, 16 Aug 2025 18:36:17 -0700
"H. Peter Anvin" <hpa@...or.com> wrote:

> The easiest way to think of XOP is as a VEX3 supporting a different set of map numbers (VEX3 supports maps 0-31, XOP maps are 8-31 but separate); however, the encoding format is the same. 

Hmm, OK. We need to enable VEX3 support too. What about the opcode?
Most of the opcode are the same, or different instructions?

Thank you,

-- 
Masami Hiramatsu (Google) <mhiramat@...nel.org>