neon_utils.hpp

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#ifndef OPENCV_HAL_NEON_UTILS_HPP
#define OPENCV_HAL_NEON_UTILS_HPP
 
#include "opencv2/core/cvdef.h"
 
 
#if CV_NEON
 
inline int32x2_t cv_vrnd_s32_f32(float32x2_t v)
{
    static int32x2_t v_sign = vdup_n_s32(1 << 31),
        v_05 = vreinterpret_s32_f32(vdup_n_f32(0.5f));
 
    int32x2_t v_addition = vorr_s32(v_05, vand_s32(v_sign, vreinterpret_s32_f32(v)));
    return vcvt_s32_f32(vadd_f32(v, vreinterpret_f32_s32(v_addition)));
}
 
inline int32x4_t cv_vrndq_s32_f32(float32x4_t v)
{
    static int32x4_t v_sign = vdupq_n_s32(1 << 31),
        v_05 = vreinterpretq_s32_f32(vdupq_n_f32(0.5f));
 
    int32x4_t v_addition = vorrq_s32(v_05, vandq_s32(v_sign, vreinterpretq_s32_f32(v)));
    return vcvtq_s32_f32(vaddq_f32(v, vreinterpretq_f32_s32(v_addition)));
}
 
inline uint32x2_t cv_vrnd_u32_f32(float32x2_t v)
{
    static float32x2_t v_05 = vdup_n_f32(0.5f);
    return vcvt_u32_f32(vadd_f32(v, v_05));
}
 
inline uint32x4_t cv_vrndq_u32_f32(float32x4_t v)
{
    static float32x4_t v_05 = vdupq_n_f32(0.5f);
    return vcvtq_u32_f32(vaddq_f32(v, v_05));
}
 
inline float32x4_t cv_vrecpq_f32(float32x4_t val)
{
    float32x4_t reciprocal = vrecpeq_f32(val);
    reciprocal = vmulq_f32(vrecpsq_f32(val, reciprocal), reciprocal);
    reciprocal = vmulq_f32(vrecpsq_f32(val, reciprocal), reciprocal);
    return reciprocal;
}
 
inline float32x2_t cv_vrecp_f32(float32x2_t val)
{
    float32x2_t reciprocal = vrecpe_f32(val);
    reciprocal = vmul_f32(vrecps_f32(val, reciprocal), reciprocal);
    reciprocal = vmul_f32(vrecps_f32(val, reciprocal), reciprocal);
    return reciprocal;
}
 
inline float32x4_t cv_vrsqrtq_f32(float32x4_t val)
{
    float32x4_t e = vrsqrteq_f32(val);
    e = vmulq_f32(vrsqrtsq_f32(vmulq_f32(e, e), val), e);
    e = vmulq_f32(vrsqrtsq_f32(vmulq_f32(e, e), val), e);
    return e;
}
 
inline float32x2_t cv_vrsqrt_f32(float32x2_t val)
{
    float32x2_t e = vrsqrte_f32(val);
    e = vmul_f32(vrsqrts_f32(vmul_f32(e, e), val), e);
    e = vmul_f32(vrsqrts_f32(vmul_f32(e, e), val), e);
    return e;
}
 
inline float32x4_t cv_vsqrtq_f32(float32x4_t val)
{
    return cv_vrecpq_f32(cv_vrsqrtq_f32(val));
}
 
inline float32x2_t cv_vsqrt_f32(float32x2_t val)
{
    return cv_vrecp_f32(cv_vrsqrt_f32(val));
}
 
#endif
 
 
#endif // OPENCV_HAL_NEON_UTILS_HPP