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[PATCH, i386]: Optimize detection of a couple of patterns

From: Uros Bizjak <ubizjak at gmail dot com>
To: "gcc-patches at gcc dot gnu dot org" <gcc-patches at gcc dot gnu dot org>
Date: Sun, 30 Sep 2018 22:28:14 +0200
Subject: [PATCH, i386]: Optimize detection of a couple of patterns

There is no need to dynamically construct clobbers of (f)emms insn.
Also, use faster detection of vzeroall pattern.

2018-09-30  Uros Bizjak  <ubizjak@gmail.com>

    * config/i386/mmx.md (EMMS): New int iterator.
    (emms): New int attribute.
    (mmx_<emms>): Macroize insn from *mmx_emms and *mmx_femms using
    EMMS int iterator.  Explicitly declare clobbers.
    (mmx_emms): Remove expander.
    (mmx_femms): Ditto.
    * config/i386/predicates.md (emms_operation): Remove predicate.
    (vzeroall_pattern): New predicate.
    (vzeroupper_pattern): Rename from vzeroupper_operation.
    * config/i386/i386.c (ix86_avx_u128_mode_after): Use
    vzeroupper_pattern and vzeroall_pattern predicates.

Bootstrapped and regression tested on x86_64-linux-gnu {,-m32}.

Committed to mainline SVN.

Uros.

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