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- /* Alignment
- * Created by Evan Nemerson <evan@nemerson.com>
- *
- * To the extent possible under law, the authors have waived all
- * copyright and related or neighboring rights to this code. For
- * details, see the Creative Commons Zero 1.0 Universal license at
- * <https://creativecommons.org/publicdomain/zero/1.0/>
- *
- * SPDX-License-Identifier: CC0-1.0
- *
- **********************************************************************
- *
- * This is portability layer which should help iron out some
- * differences across various compilers, as well as various versions of
- * C and C++.
- *
- * It was originally developed for SIMD Everywhere
- * (<https://github.com/simd-everywhere/simde>), but since its only
- * dependency is Hedley (<https://nemequ.github.io/hedley>, also CC0)
- * it can easily be used in other projects, so please feel free to do
- * so.
- *
- * If you do use this in your project, please keep a link to SIMDe in
- * your code to remind you where to report any bugs and/or check for
- * updated versions.
- *
- * # API Overview
- *
- * The API has several parts, and most macros have a few variations.
- * There are APIs for declaring aligned fields/variables, optimization
- * hints, and run-time alignment checks.
- *
- * Briefly, macros ending with "_TO" take numeric values and are great
- * when you know the value you would like to use. Macros ending with
- * "_LIKE", on the other hand, accept a type and are used when you want
- * to use the alignment of a type instead of hardcoding a value.
- *
- * Documentation for each section of the API is inline.
- *
- * True to form, MSVC is the main problem and imposes several
- * limitations on the effectiveness of the APIs. Detailed descriptions
- * of the limitations of each macro are inline, but in general:
- *
- * * On C11+ or C++11+ code written using this API will work. The
- * ASSUME macros may or may not generate a hint to the compiler, but
- * that is only an optimization issue and will not actually cause
- * failures.
- * * If you're using pretty much any compiler other than MSVC,
- * everything should basically work as well as in C11/C++11.
- */
- #if !defined(SIMDE_ALIGN_H)
- #define SIMDE_ALIGN_H
- #include "hedley.h"
- /* I know this seems a little silly, but some non-hosted compilers
- * don't have stddef.h, so we try to accommodate them. */
- #if !defined(SIMDE_ALIGN_SIZE_T_)
- #if defined(__SIZE_TYPE__)
- #define SIMDE_ALIGN_SIZE_T_ __SIZE_TYPE__
- #elif defined(__SIZE_T_TYPE__)
- #define SIMDE_ALIGN_SIZE_T_ __SIZE_TYPE__
- #elif defined(__cplusplus)
- #include <cstddef>
- #define SIMDE_ALIGN_SIZE_T_ size_t
- #else
- #include <stddef.h>
- #define SIMDE_ALIGN_SIZE_T_ size_t
- #endif
- #endif
- #if !defined(SIMDE_ALIGN_INTPTR_T_)
- #if defined(__INTPTR_TYPE__)
- #define SIMDE_ALIGN_INTPTR_T_ __INTPTR_TYPE__
- #elif defined(__PTRDIFF_TYPE__)
- #define SIMDE_ALIGN_INTPTR_T_ __PTRDIFF_TYPE__
- #elif defined(__PTRDIFF_T_TYPE__)
- #define SIMDE_ALIGN_INTPTR_T_ __PTRDIFF_T_TYPE__
- #elif defined(__cplusplus)
- #include <cstddef>
- #define SIMDE_ALIGN_INTPTR_T_ ptrdiff_t
- #else
- #include <stddef.h>
- #define SIMDE_ALIGN_INTPTR_T_ ptrdiff_t
- #endif
- #endif
- #if defined(SIMDE_ALIGN_DEBUG)
- #if defined(__cplusplus)
- #include <cstdio>
- #else
- #include <stdio.h>
- #endif
- #endif
- /* SIMDE_ALIGN_OF(Type)
- *
- * The SIMDE_ALIGN_OF macro works like alignof, or _Alignof, or
- * __alignof, or __alignof__, or __ALIGNOF__, depending on the compiler.
- * It isn't defined everywhere (only when the compiler has some alignof-
- * like feature we can use to implement it), but it should work in most
- * modern compilers, as well as C11 and C++11.
- *
- * If we can't find an implementation for SIMDE_ALIGN_OF then the macro
- * will not be defined, so if you can handle that situation sensibly
- * you may need to sprinkle some ifdefs into your code.
- */
- #if \
- (defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 201112L)) || \
- (0 && HEDLEY_HAS_FEATURE(c_alignof))
- #define SIMDE_ALIGN_OF(Type) _Alignof(Type)
- #elif \
- (defined(__cplusplus) && (__cplusplus >= 201103L)) || \
- (0 && HEDLEY_HAS_FEATURE(cxx_alignof))
- #define SIMDE_ALIGN_OF(Type) alignof(Type)
- #elif \
- HEDLEY_GCC_VERSION_CHECK(2,95,0) || \
- HEDLEY_ARM_VERSION_CHECK(4,1,0) || \
- HEDLEY_INTEL_VERSION_CHECK(13,0,0) || \
- HEDLEY_SUNPRO_VERSION_CHECK(5,13,0) || \
- HEDLEY_TINYC_VERSION_CHECK(0,9,24) || \
- HEDLEY_PGI_VERSION_CHECK(19,10,0) || \
- HEDLEY_CRAY_VERSION_CHECK(10,0,0) || \
- HEDLEY_TI_ARMCL_VERSION_CHECK(16,9,0) || \
- HEDLEY_TI_CL2000_VERSION_CHECK(16,9,0) || \
- HEDLEY_TI_CL6X_VERSION_CHECK(8,0,0) || \
- HEDLEY_TI_CL7X_VERSION_CHECK(1,2,0) || \
- HEDLEY_TI_CL430_VERSION_CHECK(16,9,0) || \
- HEDLEY_TI_CLPRU_VERSION_CHECK(2,3,2) || \
- HEDLEY_MCST_LCC_VERSION_CHECK(1,25,10) || \
- defined(__IBM__ALIGNOF__) || \
- defined(__clang__)
- #define SIMDE_ALIGN_OF(Type) __alignof__(Type)
- #elif \
- HEDLEY_IAR_VERSION_CHECK(8,40,0)
- #define SIMDE_ALIGN_OF(Type) __ALIGNOF__(Type)
- #elif \
- HEDLEY_MSVC_VERSION_CHECK(19,0,0)
- /* Probably goes back much further, but MS takes down their old docs.
- * If you can verify that this works in earlier versions please let
- * me know! */
- #define SIMDE_ALIGN_OF(Type) __alignof(Type)
- #endif
- /* SIMDE_ALIGN_MAXIMUM:
- *
- * This is the maximum alignment that the compiler supports. You can
- * define the value prior to including SIMDe if necessary, but in that
- * case *please* submit an issue so we can add the platform to the
- * detection code.
- *
- * Most compilers are okay with types which are aligned beyond what
- * they think is the maximum, as long as the alignment is a power
- * of two. Older versions of MSVC is the exception, so we need to cap
- * the alignment requests at values that the implementation supports.
- *
- * XL C/C++ will accept values larger than 16 (which is the alignment
- * of an AltiVec vector), but will not reliably align to the larger
- * value, so so we cap the value at 16 there.
- *
- * If the compiler accepts any power-of-two value within reason then
- * this macro should be left undefined, and the SIMDE_ALIGN_CAP
- * macro will just return the value passed to it. */
- #if !defined(SIMDE_ALIGN_MAXIMUM)
- #if defined(HEDLEY_MSVC_VERSION)
- #if HEDLEY_MSVC_VERSION_CHECK(19, 16, 0)
- // Visual studio 2017 and newer does not need a max
- #else
- #if defined(_M_IX86) || defined(_M_AMD64)
- #if HEDLEY_MSVC_VERSION_CHECK(19,14,0)
- #define SIMDE_ALIGN_PLATFORM_MAXIMUM 64
- #elif HEDLEY_MSVC_VERSION_CHECK(16,0,0)
- /* VS 2010 is really a guess based on Wikipedia; if anyone can
- * test with old VS versions I'd really appreciate it. */
- #define SIMDE_ALIGN_PLATFORM_MAXIMUM 32
- #else
- #define SIMDE_ALIGN_PLATFORM_MAXIMUM 16
- #endif
- #elif defined(_M_ARM) || defined(_M_ARM64)
- #define SIMDE_ALIGN_PLATFORM_MAXIMUM 8
- #endif
- #endif
- #elif defined(HEDLEY_IBM_VERSION)
- #define SIMDE_ALIGN_PLATFORM_MAXIMUM 16
- #endif
- #endif
- /* You can mostly ignore these; they're intended for internal use.
- * If you do need to use them please let me know; if they fulfill
- * a common use case I'll probably drop the trailing underscore
- * and make them part of the public API. */
- #if defined(SIMDE_ALIGN_PLATFORM_MAXIMUM)
- #if SIMDE_ALIGN_PLATFORM_MAXIMUM >= 64
- #define SIMDE_ALIGN_64_ 64
- #define SIMDE_ALIGN_32_ 32
- #define SIMDE_ALIGN_16_ 16
- #define SIMDE_ALIGN_8_ 8
- #elif SIMDE_ALIGN_PLATFORM_MAXIMUM >= 32
- #define SIMDE_ALIGN_64_ 32
- #define SIMDE_ALIGN_32_ 32
- #define SIMDE_ALIGN_16_ 16
- #define SIMDE_ALIGN_8_ 8
- #elif SIMDE_ALIGN_PLATFORM_MAXIMUM >= 16
- #define SIMDE_ALIGN_64_ 16
- #define SIMDE_ALIGN_32_ 16
- #define SIMDE_ALIGN_16_ 16
- #define SIMDE_ALIGN_8_ 8
- #elif SIMDE_ALIGN_PLATFORM_MAXIMUM >= 8
- #define SIMDE_ALIGN_64_ 8
- #define SIMDE_ALIGN_32_ 8
- #define SIMDE_ALIGN_16_ 8
- #define SIMDE_ALIGN_8_ 8
- #else
- #error Max alignment expected to be >= 8
- #endif
- #else
- #define SIMDE_ALIGN_64_ 64
- #define SIMDE_ALIGN_32_ 32
- #define SIMDE_ALIGN_16_ 16
- #define SIMDE_ALIGN_8_ 8
- #endif
- /**
- * SIMDE_ALIGN_CAP(Alignment)
- *
- * Returns the minimum of Alignment or SIMDE_ALIGN_MAXIMUM.
- */
- #if defined(SIMDE_ALIGN_MAXIMUM)
- #define SIMDE_ALIGN_CAP(Alignment) (((Alignment) < (SIMDE_ALIGN_PLATFORM_MAXIMUM)) ? (Alignment) : (SIMDE_ALIGN_PLATFORM_MAXIMUM))
- #else
- #define SIMDE_ALIGN_CAP(Alignment) (Alignment)
- #endif
- /* SIMDE_ALIGN_TO(Alignment)
- *
- * SIMDE_ALIGN_TO is used to declare types or variables. It basically
- * maps to the align attribute in most compilers, the align declspec
- * in MSVC, or _Alignas/alignas in C11/C++11.
- *
- * Example:
- *
- * struct i32x4 {
- * SIMDE_ALIGN_TO(16) int32_t values[4];
- * }
- *
- * Limitations:
- *
- * MSVC requires that the Alignment parameter be numeric; you can't do
- * something like `SIMDE_ALIGN_TO(SIMDE_ALIGN_OF(int))`. This is
- * unfortunate because that's really how the LIKE macros are
- * implemented, and I am not aware of a way to get anything like this
- * to work without using the C11/C++11 keywords.
- *
- * It also means that we can't use SIMDE_ALIGN_CAP to limit the
- * alignment to the value specified, which MSVC also requires, so on
- * MSVC you should use the `SIMDE_ALIGN_TO_8/16/32/64` macros instead.
- * They work like `SIMDE_ALIGN_TO(SIMDE_ALIGN_CAP(Alignment))` would,
- * but should be safe to use on MSVC.
- *
- * All this is to say that, if you want your code to work on MSVC, you
- * should use the SIMDE_ALIGN_TO_8/16/32/64 macros below instead of
- * SIMDE_ALIGN_TO(8/16/32/64).
- */
- #if \
- HEDLEY_HAS_ATTRIBUTE(aligned) || \
- HEDLEY_GCC_VERSION_CHECK(2,95,0) || \
- HEDLEY_CRAY_VERSION_CHECK(8,4,0) || \
- HEDLEY_IBM_VERSION_CHECK(11,1,0) || \
- HEDLEY_INTEL_VERSION_CHECK(13,0,0) || \
- HEDLEY_PGI_VERSION_CHECK(19,4,0) || \
- HEDLEY_ARM_VERSION_CHECK(4,1,0) || \
- HEDLEY_TINYC_VERSION_CHECK(0,9,24) || \
- HEDLEY_TI_ARMCL_VERSION_CHECK(16,9,0) || \
- HEDLEY_TI_CL2000_VERSION_CHECK(16,9,0) || \
- HEDLEY_TI_CL6X_VERSION_CHECK(8,0,0) || \
- HEDLEY_TI_CL7X_VERSION_CHECK(1,2,0) || \
- HEDLEY_TI_CL430_VERSION_CHECK(16,9,0) || \
- HEDLEY_TI_CLPRU_VERSION_CHECK(2,3,2)
- #define SIMDE_ALIGN_TO(Alignment) __attribute__((__aligned__(SIMDE_ALIGN_CAP(Alignment))))
- #elif \
- (defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 201112L))
- #define SIMDE_ALIGN_TO(Alignment) _Alignas(SIMDE_ALIGN_CAP(Alignment))
- #elif \
- (defined(__cplusplus) && (__cplusplus >= 201103L))
- #define SIMDE_ALIGN_TO(Alignment) alignas(SIMDE_ALIGN_CAP(Alignment))
- #elif \
- defined(HEDLEY_MSVC_VERSION)
- #define SIMDE_ALIGN_TO(Alignment) __declspec(align(Alignment))
- /* Unfortunately MSVC can't handle __declspec(align(__alignof(Type)));
- * the alignment passed to the declspec has to be an integer. */
- #define SIMDE_ALIGN_OF_UNUSABLE_FOR_LIKE
- #endif
- #define SIMDE_ALIGN_TO_64 SIMDE_ALIGN_TO(SIMDE_ALIGN_64_)
- #define SIMDE_ALIGN_TO_32 SIMDE_ALIGN_TO(SIMDE_ALIGN_32_)
- #define SIMDE_ALIGN_TO_16 SIMDE_ALIGN_TO(SIMDE_ALIGN_16_)
- #define SIMDE_ALIGN_TO_8 SIMDE_ALIGN_TO(SIMDE_ALIGN_8_)
- /* SIMDE_ALIGN_ASSUME_TO(Pointer, Alignment)
- *
- * SIMDE_ALIGN_ASSUME_TO is semantically similar to C++20's
- * std::assume_aligned, or __builtin_assume_aligned. It tells the
- * compiler to assume that the provided pointer is aligned to an
- * `Alignment`-byte boundary.
- *
- * If you define SIMDE_ALIGN_DEBUG prior to including this header then
- * SIMDE_ALIGN_ASSUME_TO will turn into a runtime check. We don't
- * integrate with NDEBUG in this header, but it may be a good idea to
- * put something like this in your code:
- *
- * #if !defined(NDEBUG)
- * #define SIMDE_ALIGN_DEBUG
- * #endif
- * #include <.../simde-align.h>
- */
- #if \
- HEDLEY_HAS_BUILTIN(__builtin_assume_aligned) || \
- HEDLEY_GCC_VERSION_CHECK(4,7,0)
- #define SIMDE_ALIGN_ASSUME_TO_UNCHECKED(Pointer, Alignment) \
- HEDLEY_REINTERPRET_CAST(__typeof__(Pointer), __builtin_assume_aligned(HEDLEY_CONST_CAST(void*, HEDLEY_REINTERPRET_CAST(const void*, Pointer)), Alignment))
- #elif HEDLEY_INTEL_VERSION_CHECK(13,0,0)
- #define SIMDE_ALIGN_ASSUME_TO_UNCHECKED(Pointer, Alignment) (__extension__ ({ \
- __typeof__(v) simde_assume_aligned_t_ = (Pointer); \
- __assume_aligned(simde_assume_aligned_t_, Alignment); \
- simde_assume_aligned_t_; \
- }))
- #elif defined(__cplusplus) && (__cplusplus > 201703L)
- #include <memory>
- #define SIMDE_ALIGN_ASSUME_TO_UNCHECKED(Pointer, Alignment) std::assume_aligned<Alignment>(Pointer)
- #else
- #if defined(__cplusplus)
- template<typename T> HEDLEY_ALWAYS_INLINE static T* simde_align_assume_to_unchecked(T* ptr, const size_t alignment)
- #else
- HEDLEY_ALWAYS_INLINE static void* simde_align_assume_to_unchecked(void* ptr, const size_t alignment)
- #endif
- {
- HEDLEY_ASSUME((HEDLEY_REINTERPRET_CAST(size_t, (ptr)) % SIMDE_ALIGN_CAP(alignment)) == 0);
- return ptr;
- }
- #if defined(__cplusplus)
- #define SIMDE_ALIGN_ASSUME_TO_UNCHECKED(Pointer, Alignment) simde_align_assume_to_unchecked((Pointer), (Alignment))
- #else
- #define SIMDE_ALIGN_ASSUME_TO_UNCHECKED(Pointer, Alignment) simde_align_assume_to_unchecked(HEDLEY_CONST_CAST(void*, HEDLEY_REINTERPRET_CAST(const void*, Pointer)), (Alignment))
- #endif
- #endif
- #if !defined(SIMDE_ALIGN_DEBUG)
- #define SIMDE_ALIGN_ASSUME_TO(Pointer, Alignment) SIMDE_ALIGN_ASSUME_TO_UNCHECKED(Pointer, Alignment)
- #else
- #include <stdio.h>
- #if defined(__cplusplus)
- template<typename T>
- static HEDLEY_ALWAYS_INLINE
- T*
- simde_align_assume_to_checked_uncapped(T* ptr, const size_t alignment, const char* file, int line, const char* ptrname)
- #else
- static HEDLEY_ALWAYS_INLINE
- void*
- simde_align_assume_to_checked_uncapped(void* ptr, const size_t alignment, const char* file, int line, const char* ptrname)
- #endif
- {
- if (HEDLEY_UNLIKELY((HEDLEY_REINTERPRET_CAST(SIMDE_ALIGN_INTPTR_T_, (ptr)) % HEDLEY_STATIC_CAST(SIMDE_ALIGN_INTPTR_T_, SIMDE_ALIGN_CAP(alignment))) != 0)) {
- fprintf(stderr, "%s:%d: alignment check failed for `%s' (%p %% %u == %u)\n",
- file, line, ptrname, HEDLEY_REINTERPRET_CAST(const void*, ptr),
- HEDLEY_STATIC_CAST(unsigned int, SIMDE_ALIGN_CAP(alignment)),
- HEDLEY_STATIC_CAST(unsigned int, HEDLEY_REINTERPRET_CAST(SIMDE_ALIGN_INTPTR_T_, (ptr)) % HEDLEY_STATIC_CAST(SIMDE_ALIGN_INTPTR_T_, SIMDE_ALIGN_CAP(alignment))));
- }
- return ptr;
- }
- #if defined(__cplusplus)
- #define SIMDE_ALIGN_ASSUME_TO(Pointer, Alignment) simde_align_assume_to_checked_uncapped((Pointer), (Alignment), __FILE__, __LINE__, #Pointer)
- #else
- #define SIMDE_ALIGN_ASSUME_TO(Pointer, Alignment) simde_align_assume_to_checked_uncapped(HEDLEY_CONST_CAST(void*, HEDLEY_REINTERPRET_CAST(const void*, Pointer)), (Alignment), __FILE__, __LINE__, #Pointer)
- #endif
- #endif
- /* SIMDE_ALIGN_LIKE(Type)
- * SIMDE_ALIGN_LIKE_#(Type)
- *
- * The SIMDE_ALIGN_LIKE macros are similar to the SIMDE_ALIGN_TO macros
- * except instead of an integer they take a type; basically, it's just
- * a more convenient way to do something like:
- *
- * SIMDE_ALIGN_TO(SIMDE_ALIGN_OF(Type))
- *
- * The versions with a numeric suffix will fall back on using a numeric
- * value in the event we can't use SIMDE_ALIGN_OF(Type). This is
- * mainly for MSVC, where __declspec(align()) can't handle anything
- * other than hard-coded numeric values.
- */
- #if defined(SIMDE_ALIGN_OF) && defined(SIMDE_ALIGN_TO) && !defined(SIMDE_ALIGN_OF_UNUSABLE_FOR_LIKE)
- #define SIMDE_ALIGN_LIKE(Type) SIMDE_ALIGN_TO(SIMDE_ALIGN_OF(Type))
- #define SIMDE_ALIGN_LIKE_64(Type) SIMDE_ALIGN_LIKE(Type)
- #define SIMDE_ALIGN_LIKE_32(Type) SIMDE_ALIGN_LIKE(Type)
- #define SIMDE_ALIGN_LIKE_16(Type) SIMDE_ALIGN_LIKE(Type)
- #define SIMDE_ALIGN_LIKE_8(Type) SIMDE_ALIGN_LIKE(Type)
- #else
- #define SIMDE_ALIGN_LIKE_64(Type) SIMDE_ALIGN_TO_64
- #define SIMDE_ALIGN_LIKE_32(Type) SIMDE_ALIGN_TO_32
- #define SIMDE_ALIGN_LIKE_16(Type) SIMDE_ALIGN_TO_16
- #define SIMDE_ALIGN_LIKE_8(Type) SIMDE_ALIGN_TO_8
- #endif
- /* SIMDE_ALIGN_ASSUME_LIKE(Pointer, Type)
- *
- * This is similar to SIMDE_ALIGN_ASSUME_TO, except that it takes a
- * type instead of a numeric value. */
- #if defined(SIMDE_ALIGN_OF) && defined(SIMDE_ALIGN_ASSUME_TO)
- #define SIMDE_ALIGN_ASSUME_LIKE(Pointer, Type) SIMDE_ALIGN_ASSUME_TO(Pointer, SIMDE_ALIGN_OF(Type))
- #endif
- /* SIMDE_ALIGN_CAST(Type, Pointer)
- *
- * SIMDE_ALIGN_CAST is like C++'s reinterpret_cast, but it will try
- * to silence warnings that some compilers may produce if you try
- * to assign to a type with increased alignment requirements.
- *
- * Note that it does *not* actually attempt to tell the compiler that
- * the pointer is aligned like the destination should be; that's the
- * job of the next macro. This macro is necessary for stupid APIs
- * like _mm_loadu_si128 where the input is a __m128i* but the function
- * is specifically for data which isn't necessarily aligned to
- * _Alignof(__m128i).
- */
- #if HEDLEY_HAS_WARNING("-Wcast-align") || defined(__clang__) || HEDLEY_GCC_VERSION_CHECK(3,4,0)
- #define SIMDE_ALIGN_CAST(Type, Pointer) (__extension__({ \
- HEDLEY_DIAGNOSTIC_PUSH \
- _Pragma("GCC diagnostic ignored \"-Wcast-align\"") \
- Type simde_r_ = HEDLEY_REINTERPRET_CAST(Type, Pointer); \
- HEDLEY_DIAGNOSTIC_POP \
- simde_r_; \
- }))
- #else
- #define SIMDE_ALIGN_CAST(Type, Pointer) HEDLEY_REINTERPRET_CAST(Type, Pointer)
- #endif
- /* SIMDE_ALIGN_ASSUME_CAST(Type, Pointer)
- *
- * This is sort of like a combination of a reinterpret_cast and a
- * SIMDE_ALIGN_ASSUME_LIKE. It uses SIMDE_ALIGN_ASSUME_LIKE to tell
- * the compiler that the pointer is aligned like the specified type
- * and casts the pointer to the specified type while suppressing any
- * warnings from the compiler about casting to a type with greater
- * alignment requirements.
- */
- #define SIMDE_ALIGN_ASSUME_CAST(Type, Pointer) SIMDE_ALIGN_ASSUME_LIKE(SIMDE_ALIGN_CAST(Type, Pointer), Type)
- #endif /* !defined(SIMDE_ALIGN_H) */
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