From: Sam James <sam@gentoo.org>
To: Simon Marchi <simark@simark.ca>
Cc: Tom de Vries <tdevries@suse.de>,
"Gerlicher, Klaus" <klaus.gerlicher@intel.com>,
"gdb-patches@sourceware.org" <gdb-patches@sourceware.org>
Subject: Re: [PATCH] [gdb/tdep] Add XOP support in amd64_get_insn_details
Date: Wed, 27 Aug 2025 15:47:04 +0100 [thread overview]
Message-ID: <87y0r4om8n.fsf@gentoo.org> (raw)
In-Reply-To: <56ce255a-78cb-4759-9dc4-4fec9334c9a4@simark.ca>
Simon Marchi <simark@simark.ca> writes:
> On 8/26/25 3:42 PM, Tom de Vries wrote:
>> On 8/26/25 15:20, Gerlicher, Klaus wrote:
>>> Hi Tom,
>>>
>>> Thanks for working on this, I was tempted to also add it also but since this is only supported on 10 year old AMD CPUs, so I didn't bother.
>>>
>>
>> Hi Klaus,
>>
>> thanks for the review.
>>
>> FWIW, I don't know how relevant this patch is, but new gdbs are used on both older and recent architectures, so it could be relevant for someone.
>
> OOC, do compilers actually produce these instructions by default? I
> would guess not. Do they produce them if you select the right
> -mcpu/-march? Perhaps they appear in some ifunc specifically crafted
> for these CPUs?
Yeah, they appear with the right -march=. It came up recently with the
kernel even: https://lore.kernel.org/regressions/175386161199.564247.597496379413236944.stgit@devnote2/
sam
prev parent reply other threads:[~2025-08-27 14:48 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-08-26 8:59 Tom de Vries
2025-08-26 13:20 ` Gerlicher, Klaus
2025-08-26 19:42 ` Tom de Vries
2025-08-27 14:36 ` Simon Marchi
2025-08-27 14:47 ` Sam James [this message]
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