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