include/private/base/SkFeatures.h

/*
 * Copyright 2022 Google LLC
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#ifndef SkFeatures_DEFINED
#define SkFeatures_DEFINED

#if !defined(SK_BUILD_FOR_ANDROID) && !defined(SK_BUILD_FOR_IOS) && !defined(SK_BUILD_FOR_WIN) && \
    !defined(SK_BUILD_FOR_UNIX) && !defined(SK_BUILD_FOR_MAC)

    #ifdef __APPLE__
        #include <TargetConditionals.h>
    #endif

    #if defined(_WIN32) || defined(__SYMBIAN32__)
        #define SK_BUILD_FOR_WIN
    #elif defined(ANDROID) || defined(__ANDROID__)
        #define SK_BUILD_FOR_ANDROID
    #elif defined(linux) || defined(__linux) || defined(__FreeBSD__) || \
          defined(__OpenBSD__) || defined(__sun) || defined(__NetBSD__) || \
          defined(__DragonFly__) || defined(__Fuchsia__) || \
          defined(__GLIBC__) || defined(__GNU__) || defined(__unix__)
        #define SK_BUILD_FOR_UNIX
    #elif TARGET_OS_IPHONE || TARGET_IPHONE_SIMULATOR
        #define SK_BUILD_FOR_IOS
    #else
        #define SK_BUILD_FOR_MAC
    #endif
#endif // end SK_BUILD_FOR_*


#if defined(SK_BUILD_FOR_WIN) && !defined(__clang__)
    #if !defined(SK_RESTRICT)
        #define SK_RESTRICT __restrict
    #endif
    #if !defined(SK_WARN_UNUSED_RESULT)
        #define SK_WARN_UNUSED_RESULT
    #endif
#endif

#if !defined(SK_RESTRICT)
    #define SK_RESTRICT __restrict__
#endif

#if !defined(SK_CPU_BENDIAN) && !defined(SK_CPU_LENDIAN)
    #if defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)
        #define SK_CPU_BENDIAN
    #elif defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)
        #define SK_CPU_LENDIAN
    #elif defined(__sparc) || defined(__sparc__) || \
      defined(_POWER) || defined(__powerpc__) || \
      defined(__ppc__) || defined(__hppa) || \
      defined(__PPC__) || defined(__PPC64__) || \
      defined(_MIPSEB) || defined(__ARMEB__) || \
      defined(__s390__) || \
      (defined(__sh__) && defined(__BIG_ENDIAN__)) || \
      (defined(__ia64) && defined(__BIG_ENDIAN__))
         #define SK_CPU_BENDIAN
    #else
        #define SK_CPU_LENDIAN
    #endif
#endif

#if defined(__i386) || defined(_M_IX86) ||  defined(__x86_64__) || defined(_M_X64)
  #define SK_CPU_X86 1
#endif

/**
 *  SK_CPU_SSE_LEVEL
 *
 *  If defined, SK_CPU_SSE_LEVEL should be set to the highest supported level.
 *  On non-intel CPU this should be undefined.
 */
#define SK_CPU_SSE_LEVEL_SSE1     10
#define SK_CPU_SSE_LEVEL_SSE2     20
#define SK_CPU_SSE_LEVEL_SSE3     30
#define SK_CPU_SSE_LEVEL_SSSE3    31
#define SK_CPU_SSE_LEVEL_SSE41    41
#define SK_CPU_SSE_LEVEL_SSE42    42
#define SK_CPU_SSE_LEVEL_AVX      51
#define SK_CPU_SSE_LEVEL_AVX2     52
#define SK_CPU_SSE_LEVEL_SKX      60

// TODO(brianosman,kjlubick) clean up these checks

// Are we in GCC/Clang?
#ifndef SK_CPU_SSE_LEVEL
    // These checks must be done in descending order to ensure we set the highest
    // available SSE level.
    #if defined(__AVX512F__) && defined(__AVX512DQ__) && defined(__AVX512CD__) && \
        defined(__AVX512BW__) && defined(__AVX512VL__)
        #define SK_CPU_SSE_LEVEL    SK_CPU_SSE_LEVEL_SKX
    #elif defined(__AVX2__)
        #define SK_CPU_SSE_LEVEL    SK_CPU_SSE_LEVEL_AVX2
    #elif defined(__AVX__)
        #define SK_CPU_SSE_LEVEL    SK_CPU_SSE_LEVEL_AVX
    #elif defined(__SSE4_2__)
        #define SK_CPU_SSE_LEVEL    SK_CPU_SSE_LEVEL_SSE42
    #elif defined(__SSE4_1__)
        #define SK_CPU_SSE_LEVEL    SK_CPU_SSE_LEVEL_SSE41
    #elif defined(__SSSE3__)
        #define SK_CPU_SSE_LEVEL    SK_CPU_SSE_LEVEL_SSSE3
    #elif defined(__SSE3__)
        #define SK_CPU_SSE_LEVEL    SK_CPU_SSE_LEVEL_SSE3
    #elif defined(__SSE2__)
        #define SK_CPU_SSE_LEVEL    SK_CPU_SSE_LEVEL_SSE2
    #endif
#endif

// Are we in VisualStudio?
#ifndef SK_CPU_SSE_LEVEL
    // These checks must be done in descending order to ensure we set the highest
    // available SSE level. 64-bit intel guarantees at least SSE2 support.
    #if defined(__AVX512F__) && defined(__AVX512DQ__) && defined(__AVX512CD__) && \
        defined(__AVX512BW__) && defined(__AVX512VL__)
        #define SK_CPU_SSE_LEVEL        SK_CPU_SSE_LEVEL_SKX
    #elif defined(__AVX2__)
        #define SK_CPU_SSE_LEVEL        SK_CPU_SSE_LEVEL_AVX2
    #elif defined(__AVX__)
        #define SK_CPU_SSE_LEVEL        SK_CPU_SSE_LEVEL_AVX
    #elif defined(_M_X64) || defined(_M_AMD64)
        #define SK_CPU_SSE_LEVEL        SK_CPU_SSE_LEVEL_SSE2
    #elif defined(_M_IX86_FP)
        #if _M_IX86_FP >= 2
            #define SK_CPU_SSE_LEVEL    SK_CPU_SSE_LEVEL_SSE2
        #elif _M_IX86_FP == 1
            #define SK_CPU_SSE_LEVEL    SK_CPU_SSE_LEVEL_SSE1
        #endif
    #endif
#endif

// ARM defines
#if defined(__arm__) && (!defined(__APPLE__) || !TARGET_IPHONE_SIMULATOR)
    #define SK_CPU_ARM32
#elif defined(__aarch64__)
    #define SK_CPU_ARM64
#endif

// All 64-bit ARM chips have NEON.  Many 32-bit ARM chips do too.
#if !defined(SK_ARM_HAS_NEON) && defined(__ARM_NEON)
    #define SK_ARM_HAS_NEON
#endif

#if defined(__ARM_FEATURE_CRC32)
    #define SK_ARM_HAS_CRC32
#endif

#endif // SkFeatures_DEFINED