/*
 * Copyright (c) 2018 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"

#if defined(VECTOR_SIZE) && defined(START) && defined(STEP) && defined(DATA_TYPE)
/** Generates a sequence of numbers starting from START and extends by increments of 'STEP' up to but not including 'END'.
 *
 * @note starting value of the sequence must be given as a preprocessor argument using -DSTART=value. e.g. -DSTART=0
 * @note difference between consequtive elements of the sequence must be given as a preprocessor argument using -DSTEP=value. e.g. -DSTEP=1
 * @note Datatype must be given as a preprocessor argument using -DDATA_TYPE=type. e.g. -DDATA_TYPE=short
 * @note vector size supported by the device must be given as a preprocessor argument using -DVECTOR_SIZE=value. e.g. -DDATA_TYPE=4
 *
 * @param[out] out_ptr                           Pointer to the destination tensor. Supported data types: U8/S8/U16/S16/U32/S32/F16/F32.
 * @param[in]  out_stride_x                      Stride of the destination tensor in X dimension (in bytes)
 * @param[in]  out_step_x                        dst_stride_x * number of elements along X 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 range(
    VECTOR_DECLARATION(out))
{
    uint           id      = get_global_id(0) * VECTOR_SIZE;
    __global void *dst_ptr = out_ptr + out_offset_first_element_in_bytes + id * sizeof(DATA_TYPE);
#if VECTOR_SIZE == 1
    DATA_TYPE seq;
    seq = (DATA_TYPE)START + (DATA_TYPE)id * (DATA_TYPE)STEP;

    *((__global DATA_TYPE *)dst_ptr) = seq;
#else // VECTOR_SIZE == 1
    VEC_DATA_TYPE(DATA_TYPE, VECTOR_SIZE)
    seq;

    seq.s0 = ((DATA_TYPE)START + (DATA_TYPE)id * (DATA_TYPE)STEP);
#if VECTOR_SIZE > 1
    seq.s1 = seq.s0 + (DATA_TYPE)STEP;
#if VECTOR_SIZE > 2
    seq.s2 = seq.s1 + (DATA_TYPE)STEP;
#if VECTOR_SIZE > 3
    seq.s3 = seq.s2 + (DATA_TYPE)STEP;
#if VECTOR_SIZE > 4
    seq.s4 = seq.s3 + (DATA_TYPE)STEP;
#if VECTOR_SIZE > 5
    seq.s5 = seq.s4 + (DATA_TYPE)STEP;
#if VECTOR_SIZE > 6
    seq.s6 = seq.s5 + (DATA_TYPE)STEP;
#if VECTOR_SIZE > 7
    seq.s7 = seq.s6 + (DATA_TYPE)STEP;
#endif // VECTOR_SIZE > 7
#endif // VECTOR_SIZE > 6
#endif // VECTOR_SIZE > 5
#endif // VECTOR_SIZE > 4
#endif // VECTOR_SIZE > 3
#endif // VECTOR_SIZE > 2
#endif // VECTOR_SIZE > 1
    VSTORE(VECTOR_SIZE)
    (seq, 0, ((__global DATA_TYPE *)dst_ptr));
#endif //VECTOR_SIZE == 1
}

#if defined(OFFSET_OUT) && defined(SCALE_OUT)

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

/** Generates a sequence of numbers starting from START and extends by increments of 'STEP' up to but not including 'END'.
 *
 * @note starting value of the sequence must be given as a preprocessor argument using -DSTART=value. e.g. -DSTART=0
 * @note difference between consequtive elements of the sequence must be given as a preprocessor argument using -DSTEP=value. e.g. -DSTEP=1
 * @note Datatype must be given as a preprocessor argument using -DDATA_TYPE=type. e.g. -DDATA_TYPE=short
 * @note vector size supported by the device must be given as a preprocessor argument using -DVECTOR_SIZE=vector_size. e.g. -DDATA_TYPE=4
 * @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 output must be passed at compile time using -DSCALE_OUT, i.e. -DSCALE_OUT=10
 *
 * @param[out] out_ptr                           Pointer to the destination tensor. Supported data types: QASYMM8.
 * @param[in]  out_stride_x                      Stride of the destination tensor in X dimension (in bytes)
 * @param[in]  out_step_x                        dst_stride_x * number of elements along X 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 range_quantized(
    VECTOR_DECLARATION(out))
{
    size_t         id      = get_global_id(0) * VECTOR_SIZE;
    __global void *dst_ptr = out_ptr + out_offset_first_element_in_bytes + id * sizeof(DATA_TYPE);
#if VECTOR_SIZE == 1
    float seq;
    seq                          = (float)START + (float)id * (float)STEP;
    seq                          = (DATA_TYPE)(int)(seq / ((float)SCALE_OUT) + (float)OFFSET_OUT);
    seq                          = max(0.0f, min(seq, 255.0f));
    *((__global uchar *)dst_ptr) = CONVERT_SAT(CONVERT_DOWN(seq, int), uchar);
#else // VECTOR_SIZE == 1
    VEC_DATA_TYPE(float, VECTOR_SIZE)
    seq;
    seq.s0 = (float)START + id * (float)STEP;
#if VECTOR_SIZE > 1
    seq.s1 = seq.s0 + (float)STEP;
#if VECTOR_SIZE > 2
    seq.s2 = seq.s1 + (float)STEP;
#if VECTOR_SIZE > 3
    seq.s3 = seq.s2 + (float)STEP;
#if VECTOR_SIZE > 4
    seq.s4 = seq.s3 + (float)STEP;
#if VECTOR_SIZE > 5
    seq.s5 = seq.s4 + (float)STEP;
#if VECTOR_SIZE > 6
    seq.s6 = seq.s5 + (float)STEP;
#if VECTOR_SIZE > 7
    seq.s7 = seq.s6 + (float)STEP;
#endif // VECTOR_SIZE > 7
#endif // VECTOR_SIZE > 6
#endif // VECTOR_SIZE > 5
#endif // VECTOR_SIZE > 4
#endif // VECTOR_SIZE > 3
#endif // VECTOR_SIZE > 2
#endif // VECTOR_SIZE > 1
    seq    = seq / ((VEC_DATA_TYPE(float, VECTOR_SIZE))((float)SCALE_OUT)) + ((VEC_DATA_TYPE(float, VECTOR_SIZE))((float)OFFSET_OUT));
    seq    = max((VEC_DATA_TYPE(float, VECTOR_SIZE))(0.0f), min(seq, (VEC_DATA_TYPE(float, VECTOR_SIZE))(255.0f)));
    VEC_DATA_TYPE(uchar, VECTOR_SIZE)
    res = CONVERT_SAT(CONVERT_DOWN(seq, VEC_DATA_TYPE(int, VECTOR_SIZE)), VEC_DATA_TYPE(uchar, VECTOR_SIZE));
    VSTORE(VECTOR_SIZE)
    (res, 0, ((__global DATA_TYPE *)dst_ptr));
#endif // VECTOR_SIZE == 1
}
#endif // defined(OFFSET_OUT) && defined(SCALE_OUT)

#endif // defined(VECTOR_SIZE) && defined(START) && defined(STEP) && defined(DATA_TYPE)