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[PATCH, i386]: Improve constant RTX costs a bit

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: Fri, 20 May 2016 19:42:41 +0200
Subject: [PATCH, i386]: Improve constant RTX costs a bit
Authentication-results: sourceware.org; auth=none

2016-05-20  Uros Bizjak  <ubizjak@gmail.com>

    * gcc/config/i386/i386.c (ix86_rtx_costs) <case CONST_DOUBLE>:
    Use IS_STACK_MODE when calculating cost of standard 80387 constants.
    Fallthru to CONST_VECTOR case to calculate cost of standard SSE
    constants.
    <case CONST_WIDE_INT>: Calculate cost of (MEM (SYMBOL_REF)).
    (ix86_legitimate_constant_p): Use CASE_CONST_SCALAR_INT
    and CASE_CONST_ANY.

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

Committed to mainline SVN.

Uros.

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