/*
 * Copyright (c) 2018-2020 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 "helpers.h"

#define SUB(x, y) (x - y)
#define ADD(x, y) (x + y)
#define MAX(x, y) max((x), (y))
#define MIN(x, y) min((x), (y))
#define SQUARED_DIFF(x, y) (x - y) * (x - y)
#define PRELU(x, y) (select(y * x, x, CONVERT((x > (DATA_TYPE_OUT)0), SELECT_VEC_DATA_TYPE(float, VEC_SIZE_OUT))))
#define DIV(x, y) (x / y)

#define CONVERT_RTE(x, type) (convert_##type##_rte((x)))
#define CONVERT_DOWN(x, type) CONVERT_RTE(x, type)

#define OP_FUN_NAME_STR(op) elementwise_operation_##op##_quantized
#define OP_FUN_NAME(op) OP_FUN_NAME_STR(op)

#if defined(OP) && defined(VEC_SIZE_IN1) && defined(VEC_SIZE_IN2) && defined(VEC_SIZE_OUT) && defined(OFFSET_IN1) && defined(OFFSET_IN2) && defined(OFFSET_OUT) && defined(SCALE_IN1) && defined(SCALE_IN2) && defined(SCALE_OUT) && defined(DATA_TYPE_OUT)

#define VEC_FLOAT VEC_DATA_TYPE(float, VEC_SIZE_OUT)
#define VEC_INT VEC_DATA_TYPE(int, VEC_SIZE_OUT)
#define VEC_TYPE VEC_DATA_TYPE(DATA_TYPE_OUT, VEC_SIZE_OUT)

/** This function executes an element-wise operation among two tensors.
 *
 * @note Vector sizes of inputs and output have to be passed at compile time using -DVEC_SIZE_IN1, -DVEC_SIZE_IN2, -DVEC_SIZE_OUT.
 * @note Leftover vector size has to be passed at compile time using -DVEC_SIZE_LEFTOVER. e.g. -DVEC_SIZE=3. It is defined as the remainder between the input's first dimension and VEC_SIZE
 * @note In case of broadcasting along the X dimension the proper preprocessor argument should be passed depending on the input (e.g. -DIS_IN1_X_BROADCASTING, -DIS_IN2_X_BROADCASTING)
 * @note The quantization offset of the first operand must be passed at compile time using -DOFFSET_IN1, i.e. -DOFFSET_IN1=10
 * @note The quantization offset of the second operand must be passed at compile time using -DOFFSET_IN2, i.e. -DOFFSET_IN2=10
 * @note The quantization offset of the output must be passed at compile time using -DOFFSET_OUT, i.e. -DOFFSET_OUT=10
 * @note The quantization scale of the first operand must be passed at compile time using -DSCALE_IN1, i.e. -DSCALE_IN1=10
 * @note The quantization scale of the second operand must be passed at compile time using -DSCALE_IN2, i.e. -DSCALE_IN2=10
 * @note The quantization scale of the output must be passed at compile time using -DSCALE_OUT, i.e. -DSCALE_OUT=10
 * @note To perform saturating operation -DSATURATE has to be passed to the compiler otherwise wrapping policy will be used.
 * @note The element-wise operation to be executed has to be passed at compile time using -DOP (e.g., -DOP=ADD)
 * @note For QSYMM16 operations OFFSET_IN1, OFFSET_IN2 and OFFSET_OUT must be set to zero
 * @note The data type must be passed at compile time using -DDATA_TYPE_OUT, i.e. -DDATA_TYPE_OUT=uchar
 *
 * @param[in]  in1_ptr                           Pointer to the source tensor. Supported data types: QASYMM8/QSYMM16
 * @param[in]  in1_stride_x                      Stride of the source tensor in X dimension (in bytes)
 * @param[in]  in1_step_x                        in1_stride_x * number of elements along X processed per workitem(in bytes)
 * @param[in]  in1_stride_y                      Stride of the source tensor in Y dimension (in bytes)
 * @param[in]  in1_step_y                        in1_stride_y * number of elements along Y processed per workitem(in bytes)
 * @param[in]  in1_stride_z                      Stride of the source tensor in Z dimension (in bytes)
 * @param[in]  in1_step_z                        in1_stride_z * number of elements along Z processed per workitem(in bytes)
 * @param[in]  in1_offset_first_element_in_bytes The offset of the first element in the source tensor
 * @param[in]  in2_ptr                           Pointer to the source tensor. Supported data types: same as @p in1_ptr
 * @param[in]  in2_stride_x                      Stride of the source tensor in X dimension (in bytes)
 * @param[in]  in2_step_x                        in2_stride_x * number of elements along X processed per workitem(in bytes)
 * @param[in]  in2_stride_y                      Stride of the source tensor in Y dimension (in bytes)
 * @param[in]  in2_step_y                        in2_stride_y * number of elements along Y processed per workitem(in bytes)
 * @param[in]  in2_stride_z                      Stride of the source tensor in Z dimension (in bytes)
 * @param[in]  in2_step_z                        in2_stride_z * number of elements along Z processed per workitem(in bytes)
 * @param[in]  in2_offset_first_element_in_bytes The offset of the first element in the source tensor
 * @param[out] out_ptr                           Pointer to the destination tensor. Supported data types: same as @p in1_ptr
 * @param[in]  out_stride_x                      Stride of the destination tensor in X dimension (in bytes)
 * @param[in]  out_step_x                        out_stride_x * number of elements along X processed per workitem(in bytes)
 * @param[in]  out_stride_y                      Stride of the destination tensor in Y dimension (in bytes)
 * @param[in]  out_step_y                        out_stride_y * number of elements along Y processed per workitem(in bytes)
 * @param[in]  out_stride_z                      Stride of the source tensor in Z dimension (in bytes)
 * @param[in]  out_step_z                        out_stride_z * number of elements along Z processed per workitem(in bytes)
 * @param[in]  out_offset_first_element_in_bytes The offset of the first element in the destination tensor
 */
__kernel void OP_FUN_NAME(OP)(
    TENSOR3D_DECLARATION(in1),
    TENSOR3D_DECLARATION(in2),
    TENSOR3D_DECLARATION(out))
{
#if VEC_SIZE_IN1 == 1
    uint in1_x_offs = 0;
#else  // VEC_SIZE_IN1 == 1
    uint in1_x_offs = max((int)(get_global_id(0) * VEC_SIZE_IN1 - (VEC_SIZE_IN1 - VEC_SIZE_LEFTOVER) % VEC_SIZE_IN1), 0);
#endif // VEC_SIZE_IN1 == 1
#if VEC_SIZE_IN2 == 1
    uint in2_x_offs = 0;
#else  // VEC_SIZE_IN2 == 1
    uint in2_x_offs = max((int)(get_global_id(0) * VEC_SIZE_IN2 - (VEC_SIZE_IN2 - VEC_SIZE_LEFTOVER) % VEC_SIZE_IN2), 0);
#endif // VEC_SIZE_IN2 == 1
    uint out_x_offs = max((int)(get_global_id(0) * VEC_SIZE_OUT - (VEC_SIZE_OUT - VEC_SIZE_LEFTOVER) % VEC_SIZE_OUT), 0);

    // Get pixels pointer
    __global uchar *in1_addr = in1_ptr + in1_offset_first_element_in_bytes + in1_x_offs * sizeof(DATA_TYPE_OUT) + get_global_id(1) * in1_step_y + get_global_id(2) * in1_step_z;
    __global uchar *in2_addr = in2_ptr + in2_offset_first_element_in_bytes + in2_x_offs * sizeof(DATA_TYPE_OUT) + get_global_id(1) * in2_step_y + get_global_id(2) * in2_step_z;
    __global uchar *out_addr = out_ptr + out_offset_first_element_in_bytes + out_x_offs * sizeof(DATA_TYPE_OUT) + get_global_id(1) * out_step_y + get_global_id(2) * out_step_z;

    VEC_INT in_a = CONVERT((VEC_DATA_TYPE(DATA_TYPE_OUT, VEC_SIZE_OUT))(VLOAD(VEC_SIZE_IN1)(0, (__global DATA_TYPE_OUT *)in1_addr)), VEC_INT);
    VEC_INT in_b = CONVERT((VEC_DATA_TYPE(DATA_TYPE_OUT, VEC_SIZE_OUT))(VLOAD(VEC_SIZE_IN2)(0, (__global DATA_TYPE_OUT *)in2_addr)), VEC_INT);

    in_a = SUB(in_a, (VEC_INT)((int)OFFSET_IN1));
    in_b = SUB(in_b, (VEC_INT)((int)OFFSET_IN2));

    const VEC_FLOAT in1f32  = CONVERT(in_a, VEC_FLOAT) * (VEC_FLOAT)((float)SCALE_IN1);
    const VEC_FLOAT in2f32  = CONVERT(in_b, VEC_FLOAT) * (VEC_FLOAT)((float)SCALE_IN2);
    const VEC_FLOAT qresf32 = OP(in1f32, in2f32) / ((VEC_FLOAT)(float)SCALE_OUT) + ((VEC_FLOAT)((float)OFFSET_OUT));
    const VEC_TYPE  res0    = CONVERT_SAT(CONVERT_DOWN(qresf32, VEC_INT), VEC_TYPE);

    // Store result
    STORE_VECTOR_SELECT(res, DATA_TYPE_OUT, out_addr, VEC_SIZE_OUT, VEC_SIZE_LEFTOVER, VEC_SIZE_LEFTOVER != 0 && get_global_id(0) == 0)
}
#endif /* defined(OP) && defined(VEC_SIZE_IN1) && defined(VEC_SIZE_IN2) && defined(VEC_SIZE_OUT) && defined(OFFSET_IN1) && defined(OFFSET_IN2) && defined(OFFSET_OUT) && defined(SCALE_IN1) && defined(SCALE_IN2) && defined(SCALE_OUT) && defined(DATA_TYPE_OUT) */