PxUnixFPU.h

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// Copyright (c) 2004-2008 AGEIA Technologies, Inc. All rights reserved.
// Copyright (c) 2001-2004 NovodeX AG. All rights reserved.
 
#ifndef PXFOUNDATION_PXUNIXFPU_H
#define PXFOUNDATION_PXUNIXFPU_H
 
#include "foundation/PxPreprocessor.h"
 
#if PX_LINUX || PX_OSX
 
#if PX_X86 || PX_X64
#if PX_EMSCRIPTEN
#include <emmintrin.h>
#endif
#include <xmmintrin.h>
#elif PX_NEON
#include <arm_neon.h>
#endif
 
PX_INLINE physx::PxSIMDGuard::PxSIMDGuard(bool enable) 
#if !PX_EMSCRIPTEN && (PX_X86 || PX_X64)
    : mEnabled(enable)
#endif
{
#if !PX_EMSCRIPTEN && (PX_X86 || PX_X64)
    if(enable)
    {
        mControlWord = _mm_getcsr();
        // set default (disable exceptions: _MM_MASK_MASK) and FTZ (_MM_FLUSH_ZERO_ON), DAZ (_MM_DENORMALS_ZERO_ON: (1<<6))
        _mm_setcsr(_MM_MASK_MASK | _MM_FLUSH_ZERO_ON | (1 << 6));
    }
    else
    {
        PX_UNUSED(enable);
        PX_ASSERT(_mm_getcsr() & _MM_FLUSH_ZERO_ON);
        PX_ASSERT(_mm_getcsr() & (1 << 6));
        PX_ASSERT(_mm_getcsr() & _MM_MASK_MASK);
    }
#endif
}
 
PX_INLINE physx::PxSIMDGuard::~PxSIMDGuard()
{
#if !PX_EMSCRIPTEN && (PX_X86 || PX_X64)
    if(mEnabled)
    {
        // restore control word and clear exception flags
        // (setting exception state flags cause exceptions on the first following fp operation)
        _mm_setcsr(mControlWord & PxU32(~_MM_EXCEPT_MASK));
    }
#endif
}
 
#else
    #error No SIMD implementation for this unix platform.
#endif // PX_LINUX || PX_OSX
 
#endif // #ifndef PXFOUNDATION_PXUNIXFPU_H