    // Copyright (C) 2013  Davis E. King (davis@dlib.net)
    // License: Boost Software License   See LICENSE.txt for the full license.
    #ifndef DLIB_SIMd_CHECK_H__
    #define DLIB_SIMd_CHECK_H__

    //#define DLIB_DO_NOT_USE_SIMD

    // figure out which SIMD instructions we can use.
    #ifndef DLIB_DO_NOT_USE_SIMD
        #if defined(_MSC_VER)
            #ifdef __AVX__
                #define DLIB_HAVE_SSE2
                #define DLIB_HAVE_SSE3
                #define DLIB_HAVE_SSE41
                #define DLIB_HAVE_AVX
            #endif
            #if defined(_M_IX86_FP) && _M_IX86_FP >= 2 && !defined(DLIB_HAVE_SSE2)
                #define DLIB_HAVE_SSE2
            #endif
        #else
            #ifdef __SSE2__
                #define DLIB_HAVE_SSE2
            #endif
            #ifdef __SSSE3__
                #define DLIB_HAVE_SSE3
            #endif
            #ifdef __SSE4_1__
                #define DLIB_HAVE_SSE41
            #endif
            #ifdef __AVX__
                #define DLIB_HAVE_AVX
            #endif
            #ifdef __AVX2__
                #define DLIB_HAVE_AVX2
            #endif
        #endif
    #endif

    // ----------------------------------------------------------------------------------------

    #ifdef DLIB_HAVE_SSE2
        #include <xmmintrin.h>
        #include <emmintrin.h>
        #include <mmintrin.h>
    #endif
    #ifdef DLIB_HAVE_SSE3
        #include <pmmintrin.h> // SSE3
        #include <tmmintrin.h>
    #endif
    #ifdef DLIB_HAVE_SSE41
        #include <smmintrin.h> // SSE4
    #endif
    #ifdef DLIB_HAVE_AVX
        #include <immintrin.h> // AVX
    #endif
    #ifdef DLIB_HAVE_AVX2
        #include <avx2intrin.h>
    #endif

    #endif // DLIB_SIMd_CHECK_H__