///////////////////////////////////////////////////////////////////////////

//

// Copyright (c) 2009-2014 DreamWorks Animation LLC. 

//

// All rights reserved.

//

// Redistribution and use in source and binary forms, with or without

// modification, are permitted provided that the following conditions are

// met:

// *       Redistributions of source code must retain the above copyright

// notice, this list of conditions and the following disclaimer.

// *       Redistributions in binary form must reproduce the above

// copyright notice, this list of conditions and the following disclaimer

// in the documentation and/or other materials provided with the

// distribution.

// *       Neither the name of DreamWorks Animation nor the names of

// its contributors may be used to endorse or promote products derived

// from this software without specific prior written permission.

//

// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

//

///////////////////////////////////////////////////////////////////////////

#include "ImfSimd.h"

#include "ImfSystemSpecific.h"

#include "ImfNamespace.h"

#include "OpenEXRConfig.h"

OPENEXR_IMF_INTERNAL_NAMESPACE_SOURCE_ENTER

namespace {

#if defined(IMF_HAVE_SSE2) &&  defined(__GNUC__)

    // Helper functions for gcc + SSE enabled

    void cpuid(int n, int &eax, int &ebx, int &ecx, int &edx)

    {

        __asm__ __volatile__ (

            "cpuid"

            : /* Output  */ "=a"(eax), "=b"(ebx), "=c"(ecx), "=d"(edx) 

            : /* Input   */ "a"(n)

            : /* Clobber */);

    }

#else // IMF_HAVE_SSE2 && __GNUC__

    // Helper functions for generic compiler - all disabled

    void cpuid(int n, int &eax, int &ebx, int &ecx, int &edx)

    {

        eax = ebx = ecx = edx = 0;

    }

#endif // IMF_HAVE_SSE2 && __GNUC__

#ifdef OPENEXR_IMF_HAVE_GCC_INLINE_ASM_AVX

    void xgetbv(int n, int &eax, int &edx)

    {

        __asm__ __volatile__ (

            "xgetbv"

            : /* Output  */ "=a"(eax), "=d"(edx) 

            : /* Input   */ "c"(n)

            : /* Clobber */);

    }

#else //  OPENEXR_IMF_HAVE_GCC_INLINE_ASM_AVX

    void xgetbv(int n, int &eax, int &edx)

    {

        eax = edx = 0;

    }

#endif //  OPENEXR_IMF_HAVE_GCC_INLINE_ASM_AVX

} // namespace 

CpuId::CpuId():

    sse2(false), 

    sse3(false), 

    ssse3(false),

    sse4_1(false), 

    sse4_2(false), 

    avx(false), 

    f16c(false)

{

    bool osxsave = false;

    int  max     = 0;

    int  eax, ebx, ecx, edx;

    cpuid(0, max, ebx, ecx, edx);

    if (max > 0)

    {

        cpuid(1, eax, ebx, ecx, edx);

        sse2    = ( edx & (1<<26) );

        sse3    = ( ecx & (1<< 0) );

        ssse3   = ( ecx & (1<< 9) );

        sse4_1  = ( ecx & (1<<19) );

        sse4_2  = ( ecx & (1<<20) );

        osxsave = ( ecx & (1<<27) );

        avx     = ( ecx & (1<<28) );

        f16c    = ( ecx & (1<<29) );

        if (!osxsave)

        {

            avx = f16c = false;

        }

        else

        {

            xgetbv(0, eax, edx);

            // eax bit 1 - SSE managed, bit 2 - AVX managed

            if ((eax & 6) != 6)

            {

                avx = f16c = false;

            }

        }

    }

}

OPENEXR_IMF_INTERNAL_NAMESPACE_SOURCE_EXIT