PxUnixIntrinsics.h

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#ifndef PXFOUNDATION_PXUNIXINTRINSICS_H
#define PXFOUNDATION_PXUNIXINTRINSICS_H

#include "foundation/Px.h"
#include "foundation/PxAssert.h"

#if !(PX_LINUX || PX_ANDROID || PX_PS4 || PX_APPLE_FAMILY)
#error "This file should only be included by Unix builds!!"
#endif

#if (PX_LINUX || PX_ANDROID) && !defined(__CUDACC__) && !PX_EMSCRIPTEN
    // Linux/android and CUDA compilation does not work with std::isfnite, as it is not marked as CUDA callable
    #include <cmath>
    #ifndef isfinite
        using std::isfinite;
    #endif
#endif

#include <math.h>
#include <float.h>

namespace physx
{
namespace intrinsics
{
PX_CUDA_CALLABLE PX_FORCE_INLINE float abs(float a)
{
    return ::fabsf(a);
}

PX_CUDA_CALLABLE PX_FORCE_INLINE float fsel(float a, float b, float c)
{
    return (a >= 0.0f) ? b : c;
}

PX_CUDA_CALLABLE PX_FORCE_INLINE float sign(float a)
{
    return (a >= 0.0f) ? 1.0f : -1.0f;
}

PX_CUDA_CALLABLE PX_FORCE_INLINE float recip(float a)
{
    return 1.0f / a;
}

PX_CUDA_CALLABLE PX_FORCE_INLINE float recipFast(float a)
{
    return 1.0f / a;
}

PX_CUDA_CALLABLE PX_FORCE_INLINE float sqrt(float a)
{
    return ::sqrtf(a);
}

PX_CUDA_CALLABLE PX_FORCE_INLINE float recipSqrt(float a)
{
    return 1.0f / ::sqrtf(a);
}

PX_CUDA_CALLABLE PX_FORCE_INLINE float recipSqrtFast(float a)
{
    return 1.0f / ::sqrtf(a);
}

PX_CUDA_CALLABLE PX_FORCE_INLINE float sin(float a)
{
    return ::sinf(a);
}

PX_CUDA_CALLABLE PX_FORCE_INLINE float cos(float a)
{
    return ::cosf(a);
}

PX_CUDA_CALLABLE PX_FORCE_INLINE float selectMin(float a, float b)
{
    return a < b ? a : b;
}

PX_CUDA_CALLABLE PX_FORCE_INLINE float selectMax(float a, float b)
{
    return a > b ? a : b;
}

PX_CUDA_CALLABLE PX_FORCE_INLINE bool isFinite(float a)
{
    //std::isfinite not recommended as of Feb 2017, since it doesn't work with g++/clang's floating point optimization.
    union localU { PxU32 i; float f; } floatUnion;
    floatUnion.f = a;
    return !((floatUnion.i & 0x7fffffff) >= 0x7f800000);
}

PX_CUDA_CALLABLE PX_FORCE_INLINE bool isFinite(double a)
{
    return !!isfinite(a);
}

PX_FORCE_INLINE void* memZero(void* dest, uint32_t count)
{
    return memset(dest, 0, count);
}

PX_FORCE_INLINE void* memSet(void* dest, int32_t c, uint32_t count)
{
    return memset(dest, c, count);
}

PX_FORCE_INLINE void* memCopy(void* dest, const void* src, uint32_t count)
{
    return memcpy(dest, src, count);
}

PX_FORCE_INLINE void* memMove(void* dest, const void* src, uint32_t count)
{
    return memmove(dest, src, count);
}

PX_FORCE_INLINE void memZero128(void* dest, uint32_t offset = 0)
{
    PX_ASSERT(((size_t(dest) + offset) & 0x7f) == 0);
    memSet(reinterpret_cast<char*>(dest) + offset, 0, 128);
}

} // namespace intrinsics
} // namespace physx

#endif // #ifndef PXFOUNDATION_PXUNIXINTRINSICS_H