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[PATCH, i386]: Fix PR84431, suboptimal code for masked shifts

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: Sat, 28 Apr 2018 09:38:44 +0200
Subject: [PATCH, i386]: Fix PR84431, suboptimal code for masked shifts

2018-04-28  Uros Bizjak  <ubizjak@gmail.com>

    PR target/84431
    * config/i386/i386.md (*ashl<dwi>3_doubleword_mask): New pattern.
    (*ashl<dwi>3_doubleword_mask_1): Ditto.
    (*<shift_insn><dwi>3_doubleword_mask): Ditto.
    (*<shift_insn><dwi>3_doubleword_mask_1): Ditto.

testsuite/ChangeLog:

2018-04-28  Uros Bizjak  <ubizjak@gmail.com>

    PR target/84431
    * gcc.target/i386/pr84431.c: New test.

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

Committed to mainline SVN.

Uros.

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