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/*
* 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
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "arm_compute/core/Helpers.h"
#include "arm_compute/core/ITensorPack.h"
#include "arm_compute/core/Window.h"
#include "arm_compute/core/experimental/Types.h"
#include "src/core/NEON/NEMath.h"
#include "src/core/NEON/NESymm.h"
#include "src/core/NEON/wrapper/wrapper.h"
#include <arm_neon.h>
#include <cmath>
#include <cstddef>
namespace arm_compute
{
namespace cpu
{
void qsymm16_neon_activation(const ITensor *src, ITensor *dst, const ActivationLayerInfo &act_info, const Window &window)
{
constexpr int window_step_x = 8;
const auto window_start_x = static_cast<int>(window.x().start());
const auto window_end_x = static_cast<int>(window.x().end());
const ActivationLayerInfo::ActivationFunction act = act_info.activation();
Window win_collapsed = window.collapse_if_possible(window, Window::DimZ);
win_collapsed.set(Window::DimX, Window::Dimension(0, 1, 1));
Iterator input(src, win_collapsed);
Iterator output(dst, win_collapsed);
const UniformQuantizationInfo qi_in = src->info()->quantization_info().uniform();
const UniformQuantizationInfo qi_out = dst->info()->quantization_info().uniform();
const auto vconst_1 = vdupq_n_f32(1.f);
const float32x4_t va_f32 = vdupq_n_f32(act_info.a());
const float32x4_t vb_f32 = vdupq_n_f32(act_info.b());
const float a_f32 = act_info.a();
const float b_f32 = act_info.b();
execute_window_loop(win_collapsed, [&](const Coordinates &)
{
const auto input_ptr = reinterpret_cast<const qsymm16_t *>(input.ptr());
const auto output_ptr = reinterpret_cast<qsymm16_t *>(output.ptr());
wrapper::traits::neon_bitvector_t<qsymm16_t, wrapper::traits::BitWidth::W128> tmp;
ARM_COMPUTE_UNUSED(tmp);
// Compute S elements per iteration
int x = window_start_x;
for(; x <= (window_end_x - window_step_x); x += window_step_x)
{
const auto vin = wrapper::vloadq(input_ptr + x);
if(act == ActivationLayerInfo::ActivationFunction::LOGISTIC)
{
// De-quantize
const auto vin_deq = vdequantize_int16(vin, qi_in.scale);
// Perform activation
const float32x4x2_t tmp_dep =
{
{
wrapper::vdiv(vconst_1, wrapper::vadd(vconst_1, wrapper::vexpq(wrapper::vneg(vin_deq.val[0])))),
wrapper::vdiv(vconst_1, wrapper::vadd(vconst_1, wrapper::vexpq(wrapper::vneg(vin_deq.val[1])))),
}
};
// Re-quantize to new output space
tmp = vquantize_int16(tmp_dep, qi_out.scale);
}
else if(act == ActivationLayerInfo::ActivationFunction::TANH)
{
// De-quantize
const auto vin_deq = vdequantize_int16(vin, qi_in.scale);
// Perform activation
const float32x4x2_t tmp_dep =
{
{
wrapper::vmul(va_f32, wrapper::vtanh(wrapper::vmul(vin_deq.val[0], vb_f32))),
wrapper::vmul(va_f32, wrapper::vtanh(wrapper::vmul(vin_deq.val[1], vb_f32))),
}
};
// Re-quantize to new output space
tmp = vquantize_int16(tmp_dep, qi_out.scale);
}
else
{
ARM_COMPUTE_ERROR("Unsupported activation function");
}
wrapper::vstore(output_ptr + x, tmp);
}
// Compute left-over elements
for(; x < window_end_x; ++x)
{
qsymm16_t in = *(reinterpret_cast<const qsymm16_t *>(input_ptr + x));
qsymm16_t tmp = 0;
if(act == ActivationLayerInfo::ActivationFunction::LOGISTIC)
{
float tmp_f = dequantize_qsymm16(in, qi_in.scale);
tmp_f = 1.f / (1.f + std::exp(-tmp_f));
tmp = quantize_qsymm16(tmp_f, qi_out);
}
else if(act == ActivationLayerInfo::ActivationFunction::TANH)
{
float tmp_f = dequantize_qsymm16(in, qi_in.scale);
tmp_f = a_f32 * std::tanh(b_f32 * tmp_f);
tmp = quantize_qsymm16(tmp_f, qi_out);
}
else
{
ARM_COMPUTE_ERROR("Unsupported activation function");
}
*(output_ptr + x) = tmp;
}
},
input, output);
}
} // namespace cpu
} // namespace arm_compute
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