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39 lines
1.6 KiB
C++
39 lines
1.6 KiB
C++
/*
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* This file is part of OpenTTD.
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* OpenTTD 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, version 2.
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* OpenTTD 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.
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* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file endian_type.hpp Definition of various endian-dependant macros. */
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#ifndef ENDIAN_TYPE_HPP
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#define ENDIAN_TYPE_HPP
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#if defined(ARM) || defined(__arm__) || defined(__alpha__)
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/** The architecture requires aligned access. */
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# define OTTD_ALIGNMENT 1
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#else
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/** The architecture does not require aligned access. */
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# define OTTD_ALIGNMENT 0
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#endif
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/** Little endian builds use this for TTD_ENDIAN. */
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#define TTD_LITTLE_ENDIAN 0
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/** Big endian builds use this for TTD_ENDIAN. */
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#define TTD_BIG_ENDIAN 1
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#if !defined(TTD_ENDIAN)
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# error "TTD_ENDIAN is not defined; please set it to either TTD_LITTLE_ENDIAN or TTD_BIG_ENDIAN"
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#endif /* !TTD_ENDIAN */
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#if !defined(NO_TAGGED_PTRS) && (defined(__x86_64__) || defined(_M_X64) || defined(__aarch64__) || defined(_M_ARM64))
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/** Tagged pointers (upper bits) may be used on this architecture */
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# define OTTD_UPPER_TAGGED_PTR 1
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#else
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/** Tagged pointers (upper bits) may not be used on this architecture */
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# define OTTD_UPPER_TAGGED_PTR 0
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#endif
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#endif /* ENDIAN_TYPE_HPP */
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