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In-Reply-To: <4576e023-ac1e-7557-2cc0-ed33ccd35f59@suse.com>
From: Hongtao Liu <crazylht@gmail.com>
Date: Fri, 4 Aug 2023 09:55:55 +0800
Message-ID: <CAMZc-bw+32w2=QVB3cL6bw24nwqUM04TTeugGudovYWW0J6AwA@mail.gmail.com>
Subject: Re: [PATCH 04/10] x86: "prefix_extra" can't really be "2"
To: Jan Beulich <jbeulich@suse.com>
Cc: "gcc-patches@gcc.gnu.org" <gcc-patches@gcc.gnu.org>, Uros Bizjak <ubizjak@gmail.com>, 
	Hongtao Liu <hongtao.liu@intel.com>, Jan Hubicka <hubicka@ucw.cz>, 
	Kirill Yukhin <kirill.yukhin@gmail.com>
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On Thu, Aug 3, 2023 at 4:11=E2=80=AFPM Jan Beulich via Gcc-patches
<gcc-patches@gcc.gnu.org> wrote:
>
> In the three remaining instances separate "prefix_0f" and "prefix_rep"
> are what is wanted instead.
Ok.
>
> gcc/
>
>         * config/i386/i386.md (rd<fsgs>base<mode>): Add "prefix_0f" and
>         "prefix_rep". Drop "prefix_extra".
>         (wr<fsgs>base<mode>): Likewise.
>         (ptwrite<mode>): Likewise.
>
> --- a/gcc/config/i386/i386.md
> +++ b/gcc/config/i386/i386.md
> @@ -25914,7 +25914,8 @@
>    "TARGET_64BIT && TARGET_FSGSBASE"
>    "rd<fsgs>base\t%0"
>    [(set_attr "type" "other")
> -   (set_attr "prefix_extra" "2")])
> +   (set_attr "prefix_0f" "1")
> +   (set_attr "prefix_rep" "1")])
>
>  (define_insn "wr<fsgs>base<mode>"
>    [(unspec_volatile [(match_operand:SWI48 0 "register_operand" "r")]
> @@ -25922,7 +25923,8 @@
>    "TARGET_64BIT && TARGET_FSGSBASE"
>    "wr<fsgs>base\t%0"
>    [(set_attr "type" "other")
> -   (set_attr "prefix_extra" "2")])
> +   (set_attr "prefix_0f" "1")
> +   (set_attr "prefix_rep" "1")])
>
>  (define_insn "ptwrite<mode>"
>    [(unspec_volatile [(match_operand:SWI48 0 "nonimmediate_operand" "rm")=
]
> @@ -25930,7 +25932,8 @@
>    "TARGET_PTWRITE"
>    "ptwrite\t%0"
>    [(set_attr "type" "other")
> -   (set_attr "prefix_extra" "2")])
> +   (set_attr "prefix_0f" "1")
> +   (set_attr "prefix_rep" "1")])
>
>  (define_insn "@rdrand<mode>"
>    [(set (match_operand:SWI248 0 "register_operand" "=3Dr")
>


--=20
BR,
Hongtao