71b4c11f8c
Commit f1606f7747 ("Simplify test for
__builtin_bswap16") changed the SConstruct test to either define both
DXX_HAVE_BUILTIN_BSWAP and DXX_HAVE_BUILTIN_BSWAP16 or to define neither
of them. Follow up that commit by removing the definition of
DXX_HAVE_BUILTIN_BSWAP16 and redirecting uses of it to
DXX_HAVE_BUILTIN_BSWAP.
146 lines
4.2 KiB
C++
146 lines
4.2 KiB
C++
/*
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* Portions of this file are copyright Rebirth contributors and licensed as
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* described in COPYING.txt.
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* Portions of this file are copyright Parallax Software and licensed
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* according to the Parallax license below.
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* See COPYING.txt for license details.
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THE COMPUTER CODE CONTAINED HEREIN IS THE SOLE PROPERTY OF PARALLAX
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SOFTWARE CORPORATION ("PARALLAX"). PARALLAX, IN DISTRIBUTING THE CODE TO
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END-USERS, AND SUBJECT TO ALL OF THE TERMS AND CONDITIONS HEREIN, GRANTS A
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ROYALTY-FREE, PERPETUAL LICENSE TO SUCH END-USERS FOR USE BY SUCH END-USERS
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IN USING, DISPLAYING, AND CREATING DERIVATIVE WORKS THEREOF, SO LONG AS
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SUCH USE, DISPLAY OR CREATION IS FOR NON-COMMERCIAL, ROYALTY OR REVENUE
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FREE PURPOSES. IN NO EVENT SHALL THE END-USER USE THE COMPUTER CODE
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CONTAINED HEREIN FOR REVENUE-BEARING PURPOSES. THE END-USER UNDERSTANDS
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AND AGREES TO THE TERMS HEREIN AND ACCEPTS THE SAME BY USE OF THIS FILE.
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COPYRIGHT 1993-1999 PARALLAX SOFTWARE CORPORATION. ALL RIGHTS RESERVED.
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*/
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/*
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*
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* code to swap bytes because of big/little endian problems.
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* contains the macros:
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* SWAP{INT64,INT,SHORT}(x): returns a swapped version of x
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* INTEL_{INT64,INT,SHORT}(x): returns x after conversion to/from little endian
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* GET_INTEL_{INT64,INT,SHORT}(src): gets value from little-endian buffer src
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* PUT_INTEL_{INT64,INT,SHORT}(dest, src): puts src into little-endian buffer dest
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*
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* the GET/PUT macros are safe to use on platforms which segfault on unaligned word access
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*
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*/
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#pragma once
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#include <cstdint>
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#include <string.h> // for memcpy
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#include <type_traits>
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#include "dxxsconf.h"
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#include "pstypes.h"
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static constexpr uint16_t SWAPSHORT(const uint16_t &x)
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{
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#ifdef DXX_HAVE_BUILTIN_BSWAP
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return __builtin_bswap16(x);
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#else
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return (x << 8) | (x >> 8);
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#endif
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}
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static constexpr int16_t SWAPSHORT(const int16_t &i)
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{
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return SWAPSHORT(static_cast<uint16_t>(i));
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}
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static constexpr uint32_t SWAPINT(const uint32_t &x)
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{
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#ifdef DXX_HAVE_BUILTIN_BSWAP
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return __builtin_bswap32(x);
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#else
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return (x << 24) | (x >> 24) | ((x & 0xff00) << 8) | ((x >> 8) & 0xff00);
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#endif
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}
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static constexpr int32_t SWAPINT(const int32_t &i)
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{
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return SWAPINT(static_cast<uint32_t>(i));
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}
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#if !DXX_WORDS_BIGENDIAN
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#define byteutil_choose_endian(F,a) (a)
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#else // ! WORDS_BIGENDIAN
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#define byteutil_choose_endian(F,a) (F(a))
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#endif // ! WORDS_BIGENDIAN
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constexpr std::integral_constant<int, DXX_WORDS_BIGENDIAN> words_bigendian{};
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#if DXX_WORDS_NEED_ALIGNMENT
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#define byteutil_unaligned_copy(dt, d, s) ( DXX_BEGIN_COMPOUND_STATEMENT { dt &destination_reference = d; memcpy(&destination_reference, (s), sizeof(d)); } DXX_END_COMPOUND_STATEMENT )
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#else // WORDS_NEED_ALIGNMENT
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#define byteutil_unaligned_copy(dt, d, s) ( DXX_BEGIN_COMPOUND_STATEMENT { dt &destination_reference = d; destination_reference = *reinterpret_cast<const dt *>(s); } DXX_END_COMPOUND_STATEMENT )
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#endif // WORDS_NEED_ALIGNMENT
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static constexpr uint16_t INTEL_SHORT(const uint16_t &x)
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{
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return byteutil_choose_endian(SWAPSHORT, x);
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}
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static constexpr int16_t INTEL_SHORT(const int16_t &x)
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{
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return byteutil_choose_endian(SWAPSHORT, x);
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}
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static constexpr uint32_t INTEL_INT(const uint32_t &x)
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{
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return byteutil_choose_endian(SWAPINT, x);
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}
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static constexpr int32_t INTEL_INT(const int32_t &x)
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{
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return byteutil_choose_endian(SWAPINT, x);
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}
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#undef byteutil_choose_endian
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template <typename T>
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static inline uint32_t GET_INTEL_INT(const T *p)
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{
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uint32_t u;
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byteutil_unaligned_copy(uint32_t, u, p);
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return INTEL_INT(u);
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}
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template <typename T>
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static inline uint16_t GET_INTEL_SHORT(const T *p)
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{
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uint16_t u;
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byteutil_unaligned_copy(uint16_t, u, p);
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return INTEL_SHORT(u);
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}
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template <typename T>
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static inline void PUT_INTEL_SHORT(uint16_t *d, const T &s)
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{
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uint16_t u = INTEL_SHORT(s);
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byteutil_unaligned_copy(uint16_t, *d, &u);
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}
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template <typename T>
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static inline void PUT_INTEL_SHORT(uint8_t *d, const T &s)
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{
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PUT_INTEL_SHORT<T>(reinterpret_cast<uint16_t *>(d), s);
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}
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template <typename T>
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static inline void PUT_INTEL_INT(uint32_t *d, const T &s)
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{
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uint32_t u = INTEL_INT(s);
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byteutil_unaligned_copy(uint32_t, *d, &u);
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}
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template <typename T>
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static inline void PUT_INTEL_INT(uint8_t *d, const T &s)
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{
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PUT_INTEL_INT<T>(reinterpret_cast<uint32_t *>(d), s);
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}
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#undef byteutil_unaligned_copy
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