From: Jan Beulich <jbeulich@suse.com>
To: "Cui, Lili" <lili.cui@intel.com>
Cc: hjl.tools@gmail.com, binutils@sourceware.org
Subject: Re: [PATCH 2/3] x86: Drop SwapSources
Date: Wed, 24 Apr 2024 10:07:39 +0200 [thread overview]
Message-ID: <8549a5b2-d8b1-451e-90c1-74ee29dadf3a@suse.com> (raw)
In-Reply-To: <20240424072356.2433122-3-lili.cui@intel.com>
On 24.04.2024 09:23, Cui, Lili wrote:
> --- a/gas/config/tc-i386.c
> +++ b/gas/config/tc-i386.c
> @@ -10434,6 +10434,14 @@ build_modrm_byte (void)
>
> switch (i.tm.opcode_modifier.vexvvvv)
> {
> + case VexVVVV_SRC2:
> + if (source != op)
> + {
> + v = source++;
> + break;
> + }
> + /* For XOP: vpshl* and vpsha*. */
> + /* Fall through. */
> case VexVVVV_SRC1:
This falling-through is odd and hence needs a better comment (then also
covering vprot*, which afaict is similarly affected). The reason for this
is the XOP.W-controlled operand swapping, if I'm not mistaken? In which
case perhaps instead of the fall-through here the logic swapping the
operands should replace VexVVVV_SRC2 by VexVVVV_SRC1?
Jan
next prev parent reply other threads:[~2024-04-24 8:07 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-24 7:23 [PATCH 0/3] x86: Optimize the encoder of the vvvv register Cui, Lili
2024-04-24 7:23 ` [PATCH 1/3] x86: Use vexvvvv to encode " Cui, Lili
2024-04-24 7:52 ` Jan Beulich
2024-04-25 13:14 ` Cui, Lili
2024-04-25 13:22 ` Jan Beulich
2024-04-26 5:33 ` Cui, Lili
2024-04-26 6:52 ` Jan Beulich
2024-04-24 7:23 ` [PATCH 2/3] x86: Drop SwapSources Cui, Lili
2024-04-24 8:07 ` Jan Beulich [this message]
2024-04-26 8:14 ` Cui, Lili
2024-04-26 10:37 ` Jan Beulich
2024-04-28 4:47 ` Cui, Lili
2024-04-29 6:40 ` Jan Beulich
2024-04-29 12:23 ` Cui, Lili
2024-04-29 13:08 ` Jan Beulich
2024-04-29 13:41 ` Cui, Lili
2024-04-29 13:49 ` Jan Beulich
2024-04-30 2:56 ` Cui, Lili
2024-04-30 6:18 ` Jan Beulich
2024-04-30 7:34 ` Cui, Lili
2024-04-30 9:22 ` Jan Beulich
2024-04-24 7:23 ` [PATCH 3/3] x86: Drop using extension_opcode to encode vvvv register Cui, Lili
2024-04-24 8:19 ` Jan Beulich
2024-04-24 8:27 ` Jan Beulich
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