src/core/NEON/SVEMath.h

/*
 * Copyright (c) 2020-2021 Arm Limited.
 *
 * SPDX-License-Identifier: MIT
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
#ifndef ARM_COMPUTE_SVEMATH_H
#define ARM_COMPUTE_SVEMATH_H

#if defined(ARM_COMPUTE_ENABLE_SVE)
#include "src/core/NEON/wrapper/intrinsics/svcvt.h"
#include "src/core/NEON/wrapper/intrinsics/svdup_n.h"
#include "src/core/NEON/wrapper/intrinsics/svreinterpret.h"
#include <arm_sve.h>
#include <array>

namespace arm_compute
{
/** Calculate exponent.
 *
 * @param[in] pg  Input predicate.
 * @param[in] val Input vector value in F32 format.
 *
 * @return The calculated exponent.
 */
svfloat32_t svexp_f32_z(svbool_t pg, svfloat32_t val);

/** Calculate reciprocal.
 *
 * @param[in] pg Input predicate.
 * @param[in] x  Input value.
 *
 * @return The calculated reciprocal.
 */
svfloat32_t svinv_f32_z(svbool_t pg, svfloat32_t x);

/** Calculate logarithm
 *
 * @param[in] pg Input predicate.
 * @param[in] x  Input vector value in F32 format.
 *
 * @return The calculated logarithm.
 */
svfloat32_t svlog_f32_z(svbool_t pg, svfloat32_t x);

/** Calculate hyperbolic tangent.
 *
 * tanh(x) = (e^2x - 1)/(e^2x + 1)
 *
 * @note We clamp x to [-5,5] to avoid overflowing issues.
 *
 * @param[in] pg  Input predicate.
 * @param[in] val Input vector value in F32 format.
 *
 * @return The calculated Hyperbolic Tangent.
 */
svfloat32_t svtanh_f32_z(svbool_t pg, svfloat32_t val);

/** Calculate hyperbolic tangent.
 *
 * tanh(x) = (e^2x - 1)/(e^2x + 1)
 *
 * @note We clamp x to [-5,5] to avoid overflowing issues.
 *
 * @param[in] pg  Input predicate.
 * @param[in] val Input vector value in F16 format.
 *
 * @return The calculated Hyperbolic Tangent.
 */
svfloat16_t svtanh_f16_z(svbool_t pg, svfloat16_t val);

/** Calculate exponential
 *
 * @param[in] pg Input predicate.
 * @param[in] x  Input vector value in F16 format.
 *
 * @return The calculated exponent.
 */
svfloat16_t svexp_f16_z(svbool_t pg, svfloat16_t x);

/** Calculate reciprocal.
 *
 * @param[in] pg Input predicate.
 * @param[in] x  Input value.
 *
 * @return The calculated reciprocal.
 */
svfloat16_t svinv_f16_z(svbool_t pg, svfloat16_t x);

/** Calculate logarithm
 *
 * @param[in] pg Input predicate.
 * @param[in] x  Input vector value in F32 format.
 *
 * @return The calculated logarithm.
 */
svfloat16_t svlog_f16_z(svbool_t pg, svfloat16_t x);

/** Calculate inverse square root.
 *
 * @param[in] pg  Input predicate.
 * @param[in] val Input value.
 *
 * @return The calculated inverse square root.
 */
template <typename VectorType>
inline VectorType svinvsqrt(svbool_t pg, VectorType val)
{
    auto sqrt_reciprocal = svrsqrte(val);
    sqrt_reciprocal      = svmul_z(pg, svrsqrts(svmul_z(pg, val, sqrt_reciprocal), sqrt_reciprocal), sqrt_reciprocal);
    sqrt_reciprocal      = svmul_z(pg, svrsqrts(svmul_z(pg, val, sqrt_reciprocal), sqrt_reciprocal), sqrt_reciprocal);
    return sqrt_reciprocal;
}

/** Calculate sine.
 *
 * @param[in] pg  Input predicate.
 * @param[in] val Input vector value in radians, F32 format.
 *
 * @return The calculated sine.
 */
svfloat32_t svsin_f32_z(svbool_t pg, svfloat32_t val);

/** Calculate sine.
 *
 * @param[in] pg  Input predicate.
 * @param[in] val Input vector value in radians, F16 format.
 *
 * @return The calculated sine.
 */
svfloat16_t svsin_f16_z(svbool_t pg, svfloat16_t val);

/** Calculate n power of a number.
 *
 * pow(x,n) = e^(n*log(x))
 *
 * @param[in] pg Input predicate.
 * @param[in] a  Input vector value in F32 format.
 * @param[in] b  Powers to raise the input to.
 *
 * @return The calculated power.
 */
svfloat32_t svpow_f32_z(svbool_t pg, svfloat32_t a, svfloat32_t b);

/** Calculate n power of a number.
 *
 * pow(x,n) = e^(n*log(x))
 *
 * @param[in] pg Input predicate.
 * @param[in] a  Input vector value in F16 format.
 * @param[in] b  Powers to raise the input to.
 *
 * @return The calculated power.
 */
svfloat16_t svpow_f16_z(svbool_t pg, svfloat16_t a, svfloat16_t b);

/** Convert and pack four 32-bit float vectors into an 8-bit integer vector
 *
 * @param[in] in_0 The first float vector
 * @param[in] in_1 The second float vector
 * @param[in] in_2 The third float vector
 * @param[in] in_3 The fourth float vector
 *
 * @return The converted integer vector
 */
template <typename int_vec_type>
int_vec_type convert_float_to_int(const svfloat32_t &in_0, const svfloat32_t &in_1, const svfloat32_t &in_2, const svfloat32_t &in_3);

} // namespace arm_compute
#include "src/core/NEON/SVEMath.inl"
#endif /* defined(ARM_COMPUTE_ENABLE_SVE) */
#endif /* ARM_COMPUTE_SVEMATH_H */