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- // config_align.h - written and placed in public domain by Jeffrey Walton
- // the bits that make up this source file are from the
- // library's monolithic config.h.
- /// \file config_align.h
- /// \brief Library configuration file
- /// \details <tt>config_align.h</tt> provides defines for aligned memory
- /// allocations.
- /// \details <tt>config.h</tt> was split into components in May 2019 to better
- /// integrate with Autoconf and its feature tests. The splitting occurred so
- /// users could continue to include <tt>config.h</tt> while allowing Autoconf
- /// to write new <tt>config_asm.h</tt> and new <tt>config_cxx.h</tt> using
- /// its feature tests.
- /// \note You should include <tt>config.h</tt> rather than <tt>config_align.h</tt>
- /// directly.
- /// \sa <A HREF="https://github.com/weidai11/cryptopp/issues/835">Issue 835,
- /// Make config.h more autoconf friendly</A>,
- /// <A HREF="https://www.cryptopp.com/wiki/Configure.sh">Configure.sh script</A>
- /// on the Crypto++ wiki
- /// \since Crypto++ 8.3
- #ifndef CRYPTOPP_CONFIG_ALIGN_H
- #define CRYPTOPP_CONFIG_ALIGN_H
- #include "config_asm.h" // CRYPTOPP_DISABLE_ASM
- #include "config_cpu.h" // X86, X32, X64, ARM32, ARM64, etc
- #include "config_cxx.h" // CRYPTOPP_CXX11_ALIGNAS
- #include "config_ver.h" // Compiler versions
- // Nearly all Intel's and AMD's have SSE. Enable it independent of SSE ASM and intrinsics.
- // ARM NEON and ARMv8 ASIMD only need natural alignment of an element in the vector.
- // Altivec through POWER7 need vector alignment. POWER8 and POWER9 relax the requirement.
- #if defined(CRYPTOPP_DISABLE_ASM)
- #define CRYPTOPP_BOOL_ALIGN16 0
- #elif (CRYPTOPP_BOOL_X86 || CRYPTOPP_BOOL_X32 || CRYPTOPP_BOOL_X64 || \
- CRYPTOPP_BOOL_PPC32 || CRYPTOPP_BOOL_PPC64)
- #define CRYPTOPP_BOOL_ALIGN16 1
- #else
- #define CRYPTOPP_BOOL_ALIGN16 0
- #endif
- // How to allocate 16-byte aligned memory (for SSE2)
- // posix_memalign see https://forum.kde.org/viewtopic.php?p=66274
- #if defined(_MSC_VER)
- #define CRYPTOPP_MM_MALLOC_AVAILABLE
- #elif defined(__linux__) || defined(__sun__) || defined(__CYGWIN__)
- #define CRYPTOPP_MEMALIGN_AVAILABLE
- #elif defined(__APPLE__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__)
- #define CRYPTOPP_MALLOC_ALIGNMENT_IS_16
- #elif (defined(_GNU_SOURCE) || ((_XOPEN_SOURCE + 0) >= 600)) && (_POSIX_ADVISORY_INFO > 0)
- #define CRYPTOPP_POSIX_MEMALIGN_AVAILABLE
- #else
- #define CRYPTOPP_NO_ALIGNED_ALLOC
- #endif
- // Sun Studio Express 3 (December 2006) provides GCC-style attributes.
- // IBM XL C/C++ alignment modifier per Optimization Guide, pp. 19-20.
- // __IBM_ATTRIBUTES per XLC 12.1 AIX Compiler Manual, p. 473.
- // CRYPTOPP_ALIGN_DATA may not be reliable on AIX.
- #if defined(CRYPTOPP_CXX11_ALIGNAS)
- #define CRYPTOPP_ALIGN_DATA(x) alignas(x)
- #elif defined(_MSC_VER)
- #define CRYPTOPP_ALIGN_DATA(x) __declspec(align(x))
- #elif defined(__GNUC__) || defined(__clang__) || (__SUNPRO_CC >= 0x5100)
- #define CRYPTOPP_ALIGN_DATA(x) __attribute__((aligned(x)))
- #elif defined(__xlc__) || defined(__xlC__)
- #define CRYPTOPP_ALIGN_DATA(x) __attribute__((aligned(x)))
- #else
- #define CRYPTOPP_ALIGN_DATA(x)
- #endif
- #endif // CRYPTOPP_CONFIG_ALIGN_H
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