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[PATCH, i386]: Improve STV conversion of 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: Wed, 28 Aug 2019 17:12:52 +0200
Subject: [PATCH, i386]: Improve STV conversion of shifts

Attached patch improves costing for STV shifts and corrects reject
condition for out of range shift count operands.

2019-08-28  Uroš Bizjak  <ubizjak@gmail.com>

    * config/i386/i386-features.c
    (general_scalar_chain::compute_convert_gain):
    Correct cost for double-word shifts.
    (general_scalar_to_vector_candidate_p): Reject count operands
    greater or equal to mode bitsize.

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

Committed to mainline SVN.

Uros.

Attachment: p.diff.txt
Description: Text document

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