From: "Cui, Lili" <lili.cui@intel.com>
To: "Beulich, Jan" <JBeulich@suse.com>
Cc: "hjl.tools@gmail.com" <hjl.tools@gmail.com>,
"binutils@sourceware.org" <binutils@sourceware.org>
Subject: RE: [PATCH V2] Support APX NF
Date: Tue, 12 Mar 2024 06:12:45 +0000 [thread overview]
Message-ID: <SJ0PR11MB56003A164C567DB1A86BB4C19E2B2@SJ0PR11MB5600.namprd11.prod.outlook.com> (raw)
In-Reply-To: <e8488320-e374-4db0-abc7-4181626e1ada@suse.com>
> -----Original Message-----
> From: Jan Beulich <jbeulich@suse.com>
> Sent: Monday, March 11, 2024 10:10 PM
> To: Cui, Lili <lili.cui@intel.com>
> Cc: hjl.tools@gmail.com; binutils@sourceware.org
> Subject: Re: [PATCH V2] Support APX NF
>
> On 11.03.2024 14:54, Cui, Lili wrote:
> >> -----Original Message-----
> >> From: Jan Beulich <jbeulich@suse.com>
> >> Sent: Friday, March 8, 2024 5:36 PM
> >>
> >> On 04.03.2024 09:15, Cui, Lili wrote:
> >>> @@ -7218,6 +7229,11 @@ parse_insn (const char *line, char
> *mnemonic,
> >> bool prefix_only)
> >>> /* {rex2} */
> >>> i.rex2_encoding = true;
> >>> break;
> >>> + case Prefix_NF:
> >>> + /* {nf} */
> >>> + i.has_nf = true;
> >>> + i.encoding = encoding_evex;
> >>> + break;
> >>
> >> It's not quite as easy, I'm afraid: Have you thought of the "{vex} {nf} ..."
> >> case? (I think I previously indicated that their combination,
> >> actually in either order, needs properly rejecting.) Without having
> >> spent much thought on it, perhaps it would suffice to check here that
> >> the field is still encoding_default, and leave the value alone
> >> otherwise (in order to reject bad combinations elsewhere).
> >>
> > Oh, good point. Do you think it's ok to report bad outside of "switch"?
> >
> > case Prefix_NF:
> > /* {nf} */
> > i.has_nf = true;
> > - i.encoding = encoding_evex;
> > + if (i.encoding == encoding_default)
> > + i.encoding = encoding_evex;
> > break;
> > case Prefix_NoOptimize:
> > /* {nooptimize} */
> > i.no_optimize = true;
> > break;
> > default:
> > abort ();
> > }
> > + if (i.has_nf && i.encoding != encoding_evex)
> > + {
> > + as_bad (_("{nf} cannot be combined with {vex}/{vex3}"));
> > + return NULL;
> > + }
>
> Where the checking is done is secondary to me. My primary point is that the
> above isn't correct: There are more encoding variants than just vex, vex3, and
> evex.
>
> That said, reporting the error right here may lead to multiple identical errors
> being reported for a single line of input. This wants avoiding, at which point
> placing the check here is ruled out.
>
Sorry, I didn’t get you here, do you think the current implementation is wrong? I think for parse_insn stage i.encodin only has those encoding variants, do you think we need to move further back? Maybe put them together with REX/REX2 prefix checking?
/* Check for explicit REX prefix. */
if (i.prefix[REX_PREFIX] || i.rex_encoding)
{
as_bad (_("REX prefix invalid with `%s'"), insn_name (&i.tm));
return;
}
/* Check for explicit REX2 prefix. */
if (i.rex2_encoding)
{
as_bad (_("{rex2} prefix invalid with `%s'"), insn_name (&i.tm));
return;
}
Thanks,
Lili.
next prev parent reply other threads:[~2024-03-12 6:12 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-04 8:15 Cui, Lili
2024-03-08 9:36 ` Jan Beulich
2024-03-11 13:54 ` Cui, Lili
2024-03-11 14:09 ` Jan Beulich
2024-03-12 6:12 ` Cui, Lili [this message]
2024-03-12 7:46 ` Jan Beulich
2024-03-12 8:51 ` Cui, Lili
2024-03-12 13:22 ` Cui, Lili
2024-03-12 13:53 ` Jan Beulich
2024-03-13 2:54 ` Cui, Lili
2024-03-13 7:36 ` Jan Beulich
2024-03-18 11:21 ` Cui, Lili
2024-03-18 11:50 ` Jan Beulich
2024-03-18 13:43 ` Cui, Lili
2024-03-19 1:24 ` Cui, Lili
2024-03-08 10:40 ` Jan Beulich
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