From: "H.J. Lu" <hjl.tools@gmail.com>
To: "Martin Liška" <mliska@suse.cz>
Cc: GCC Patches <gcc-patches@gcc.gnu.org>
Subject: Re: [PATCH] i386: support micro-levels in target{, _clone} attrs [PR101696]
Date: Thu, 12 Aug 2021 08:26:00 -0700 [thread overview]
Message-ID: <CAMe9rOr0HmkMRcd9kbx75xEaGcF_ut42rpjgC9uNodTkcust8g@mail.gmail.com> (raw)
In-Reply-To: <18b1cf5b-a80c-fc00-e638-2f5b5d4136a9@suse.cz>
On Thu, Aug 12, 2021 at 8:22 AM Martin Liška <mliska@suse.cz> wrote:
>
> On 8/12/21 4:51 PM, H.J. Lu wrote:
> > On Thu, Aug 12, 2021 at 7:39 AM Martin Liška <mliska@suse.cz> wrote:
> >>
> >> On 8/12/21 4:25 PM, H.J. Lu wrote:
> >>> Please send out the v2 patch with the enclosed patch. I added some tests.
> >>
> >> Thanks, there's patch which includes your changes.
> >>
> >> Martin
> >
> > diff --git a/gcc/common/config/i386/i386-isas.h
> > b/gcc/common/config/i386/i386-isas.h
> > index 898c18f3dda..cd9523b8fbc 100644
> > --- a/gcc/common/config/i386/i386-isas.h
> > +++ b/gcc/common/config/i386/i386-isas.h
> > @@ -169,4 +169,8 @@ ISA_NAMES_TABLE_START
> > ISA_NAMES_TABLE_ENTRY("aeskle", FEATURE_AESKLE, P_NONE, NULL)
> > ISA_NAMES_TABLE_ENTRY("widekl", FEATURE_WIDEKL, P_NONE, "-mwidekl")
> > ISA_NAMES_TABLE_ENTRY("avxvnni", FEATURE_AVXVNNI, P_NONE, "-mavxvnni")
> > + ISA_NAMES_TABLE_ENTRY("x86-64", FEATURE_X86_64_BASELINE, P_NONE, NULL)
> > + ISA_NAMES_TABLE_ENTRY("x86-64-v2", FEATURE_X86_64_V2, P_NONE, NULL)
> > + ISA_NAMES_TABLE_ENTRY("x86-64-v3", FEATURE_X86_64_V3, P_NONE, NULL)
> > + ISA_NAMES_TABLE_ENTRY("x86-64-v4", FEATURE_X86_64_V4, P_NONE, NULL)
> >
> > If they have proper feature_priority, can you avoid
>
> I don't think so. First we likely want supporting "arch=x86-64-v3" rather than
> "x86-64-v3" in e.g. 'target' attribute. That means a special handling by the code
> I added.
Will it hurt if they have proper feature_priorities you added?
> The following fails as there's no corresponding -m$option.
>
> pr101696.c:5:45: error: attribute ‘x86-64-v4’ argument ‘target’ is unknown
>
> 5 | __attribute__ ((target ("x86-64-v4"))) void foo () { __builtin_printf ("arch=x86-64-v4\n"); }
>
> | ^~~
>
>
> Or do I miss something and we can do it in a simpler way?
>
> Cheers,
> Martin
>
> >
> > iff --git a/gcc/config/i386/i386-builtins.c b/gcc/config/i386/i386-builtins.c
> > index 204e2903126..492873bb076 100644
> > --- a/gcc/config/i386/i386-builtins.c
> > +++ b/gcc/config/i386/i386-builtins.c
> > @@ -1904,8 +1904,24 @@ get_builtin_code_for_version (tree decl, tree
> > *predicate_list)
> > return 0;
> > new_target = TREE_TARGET_OPTION (target_node);
> > gcc_assert (new_target);
> > -
> > - if (new_target->arch_specified && new_target->arch > 0)
> > + enum ix86_builtins builtin_fn = IX86_BUILTIN_CPU_IS;
> > +
> > + /* Special case x86-64 micro-level architectures. */
> > + const char *arch_name = attrs_str + strlen ("arch=");
> > + if (startswith (arch_name, "x86-64"))
> > + {
> > + arg_str = arch_name;
> > + builtin_fn = IX86_BUILTIN_CPU_SUPPORTS;
> > + if (strcmp (arch_name, "x86-64") == 0)
> > + priority = P_X86_64_BASELINE;
> > + else if (strcmp (arch_name, "x86-64-v2") == 0)
> > + priority = P_X86_64_V2;
> > + else if (strcmp (arch_name, "x86-64-v3") == 0)
> > + priority = P_X86_64_V3;
> > + else if (strcmp (arch_name, "x86-64-v4") == 0)
> > + priority = P_X86_64_V4;
> > + }
> >
> > if (predicate_list)
> > {
> > - predicate_decl = ix86_builtins [(int) IX86_BUILTIN_CPU_IS];
> > + predicate_decl = ix86_builtins [(int) builtin_fn];
> >
> > Is this required?
> >
>
--
H.J.
next prev parent reply other threads:[~2021-08-12 15:26 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-12 14:12 [PATCH] i386: support micro-levels in target{,_clone} " Martin Liška
2021-08-12 14:25 ` [PATCH] i386: support micro-levels in target{, _clone} " H.J. Lu
2021-08-12 14:39 ` [PATCH] i386: support micro-levels in target{,_clone} " Martin Liška
2021-08-12 14:51 ` [PATCH] i386: support micro-levels in target{, _clone} " H.J. Lu
2021-08-12 15:22 ` [PATCH] i386: support micro-levels in target{,_clone} " Martin Liška
2021-08-12 15:26 ` H.J. Lu [this message]
2021-08-12 15:31 ` Martin Liška
2021-08-12 17:35 ` [PATCH] i386: support micro-levels in target{, _clone} " H.J. Lu
2021-08-13 8:10 ` [PATCH] i386: support micro-levels in target{,_clone} " Martin Liška
2021-08-13 13:41 ` [PATCH] i386: support micro-levels in target{, _clone} " H.J. Lu
2021-09-13 13:28 ` [PATCH] i386: support micro-levels in target{,_clone} " Martin Liška
2021-09-13 14:36 ` [PATCH] i386: support micro-levels in target{, _clone} " Uros Bizjak
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