GCC Middle and Back End API Reference
Data Fields
lower_subreg_choices Struct Reference

#include <lower-subreg.h>

Data Fields

bool move_modes_to_split [MAX_MACHINE_MODE]
bool splitting_zext
bool splitting_ashift [MAX_BITS_PER_WORD]
bool splitting_lshiftrt [MAX_BITS_PER_WORD]
bool splitting_ashiftrt [MAX_BITS_PER_WORD]
bool something_to_do

Detailed Description

Target-dependent costs for lower-subreg.c. Copyright (C) 2012-2013 Free Software Foundation, Inc.

This file is part of GCC.

GCC is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, or (at your option; any later version.

GCC is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with GCC; see the file COPYING3. If not see http://www.gnu.org/licenses/. Information about whether, and where, lower-subreg should be applied.

Field Documentation

bool lower_subreg_choices::move_modes_to_split[MAX_MACHINE_MODE]

A boolean vector for move splitting that is indexed by mode and is true for each mode that is to have its copies split.

bool lower_subreg_choices::something_to_do

True if there is at least one mode that is worth splitting.

bool lower_subreg_choices::splitting_ashift[MAX_BITS_PER_WORD]

Index X is true if twice_word_mode shifts by X + BITS_PER_WORD should be split.

bool lower_subreg_choices::splitting_ashiftrt[MAX_BITS_PER_WORD]
bool lower_subreg_choices::splitting_lshiftrt[MAX_BITS_PER_WORD]
bool lower_subreg_choices::splitting_zext

True if zero-extensions from word_mode to twice_word_mode should be split.

The documentation for this struct was generated from the following file: