1 // config_align.h - written and placed in public domain by Jeffrey Walton 2 // the bits that make up this source file are from the 3 // library's monolithic config.h. 4 5 /// \file config_align.h 6 /// \brief Library configuration file 7 /// \details <tt>config_align.h</tt> provides defines for aligned memory 8 /// allocations. 9 /// \details <tt>config.h</tt> was split into components in May 2019 to better 10 /// integrate with Autoconf and its feature tests. The splitting occurred so 11 /// users could continue to include <tt>config.h</tt> while allowing Autoconf 12 /// to write new <tt>config_asm.h</tt> and new <tt>config_cxx.h</tt> using 13 /// its feature tests. 14 /// \note You should include <tt>config.h</tt> rather than <tt>config_align.h</tt> 15 /// directly. 16 /// \sa <A HREF="https://github.com/weidai11/cryptopp/issues/835">Issue 835, 17 /// Make config.h more autoconf friendly</A>, 18 /// <A HREF="https://www.cryptopp.com/wiki/Configure.sh">Configure.sh script</A> 19 /// on the Crypto++ wiki 20 /// \since Crypto++ 8.3 21 22 #ifndef CRYPTOPP_CONFIG_ALIGN_H 23 #define CRYPTOPP_CONFIG_ALIGN_H 24 25 #include "config_asm.h" // CRYPTOPP_DISABLE_ASM 26 #include "config_cpu.h" // X86, X32, X64, ARM32, ARM64, etc 27 #include "config_cxx.h" // CRYPTOPP_CXX11_ALIGNAS 28 #include "config_ver.h" // Compiler versions 29 30 // Nearly all Intel's and AMD's have SSE. Enable it independent of SSE ASM and intrinsics. 31 // ARM NEON and ARMv8 ASIMD only need natural alignment of an element in the vector. 32 // Altivec through POWER7 need vector alignment. POWER8 and POWER9 relax the requirement. 33 #if defined(CRYPTOPP_DISABLE_ASM) 34 #define CRYPTOPP_BOOL_ALIGN16 0 35 #elif (CRYPTOPP_BOOL_X86 || CRYPTOPP_BOOL_X32 || CRYPTOPP_BOOL_X64 || \ 36 CRYPTOPP_BOOL_PPC32 || CRYPTOPP_BOOL_PPC64) 37 #define CRYPTOPP_BOOL_ALIGN16 1 38 #else 39 #define CRYPTOPP_BOOL_ALIGN16 0 40 #endif 41 42 // How to allocate 16-byte aligned memory (for SSE2) 43 // posix_memalign see https://forum.kde.org/viewtopic.php?p=66274 44 #if defined(_MSC_VER) 45 #define CRYPTOPP_MM_MALLOC_AVAILABLE 46 #elif defined(__linux__) || defined(__sun__) || defined(__CYGWIN__) 47 #define CRYPTOPP_MEMALIGN_AVAILABLE 48 #elif defined(__APPLE__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__) 49 #define CRYPTOPP_MALLOC_ALIGNMENT_IS_16 50 #elif (defined(_GNU_SOURCE) || ((_XOPEN_SOURCE + 0) >= 600)) && (_POSIX_ADVISORY_INFO > 0) 51 #define CRYPTOPP_POSIX_MEMALIGN_AVAILABLE 52 #else 53 #define CRYPTOPP_NO_ALIGNED_ALLOC 54 #endif 55 56 // Sun Studio Express 3 (December 2006) provides GCC-style attributes. 57 // IBM XL C/C++ alignment modifier per Optimization Guide, pp. 19-20. 58 // __IBM_ATTRIBUTES per XLC 12.1 AIX Compiler Manual, p. 473. 59 // CRYPTOPP_ALIGN_DATA may not be reliable on AIX. 60 #if defined(CRYPTOPP_CXX11_ALIGNAS) 61 #define CRYPTOPP_ALIGN_DATA(x) alignas(x) 62 #elif defined(_MSC_VER) 63 #define CRYPTOPP_ALIGN_DATA(x) __declspec(align(x)) 64 #elif defined(__GNUC__) || defined(__clang__) || (__SUNPRO_CC >= 0x5100) 65 #define CRYPTOPP_ALIGN_DATA(x) __attribute__((aligned(x))) 66 #elif defined(__xlc__) || defined(__xlC__) 67 #define CRYPTOPP_ALIGN_DATA(x) __attribute__((aligned(x))) 68 #else 69 #define CRYPTOPP_ALIGN_DATA(x) 70 #endif 71 72 #endif // CRYPTOPP_CONFIG_ALIGN_H 73