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/*
* Copyright (c) 2017 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(WIDTH) && defined(HEIGHT) && defined(DEPTH)
/** This function identifies the min and maximum value of an input 3D tensor.
*
* @note The width, height and depth of the input tensor must be provided at compile time using -DWIDTH, -DHEIGHT and -DDEPTH (e.g. -DWIDTH=320, -DHEIGHT=240, -DDEPTH=3)
*
* @param[in] src_ptr Pointer to the source tensor. Supported data types: F32
* @param[in] src_stride_x Stride of the source image in X dimension (in bytes)
* @param[in] src_step_x src_stride_x * number of elements along X processed per workitem(in bytes)
* @param[in] src_stride_y Stride of the source image in Y dimension (in bytes)
* @param[in] src_step_y src_stride_y * number of elements along Y processed per workitem(in bytes)
* @param[in] src_stride_z Stride of the source image in Z dimension (in bytes)
* @param[in] src_step_z src_stride_z * number of elements along Z processed per workitem(in bytes)
* @param[in] src_offset_first_element_in_bytes The offset of the first element in the source image
* @param[in] dst_ptr Pointer to the min/max vector. Minimum value in position 0, maximum value in position 1. Supported data types: F32.
* @param[in] dst_stride_x Stride of the min/max vector in X dimension (in bytes)
* @param[in] dst_step_x dst_stride_x * number of elements along X processed per workitem(in bytes)
* @param[in] dst_offset_first_element_in_bytes The offset of the first element in the min/max vector
*/
__kernel void minmax_layer(
TENSOR3D_DECLARATION(src),
VECTOR_DECLARATION(dst))
{
Tensor3D src = CONVERT_TO_TENSOR3D_STRUCT(src);
Vector dst = CONVERT_TO_VECTOR_STRUCT(dst);
float4 min_value = (float4)FLT_MAX;
float4 max_value = (float4) - FLT_MAX;
float2 min_max_value = (float2)(FLT_MAX, -FLT_MAX);
for(int z = 0; z < DEPTH; ++z)
{
for(int y = 0; y < HEIGHT; ++y)
{
int x = 0;
__global float *src_addr = (__global float *)(src.ptr + y * src_stride_y + z * src_stride_z);
for(; x <= (int)(WIDTH - 8); x += 8)
{
float8 value = *(src_addr + x);
min_value = select(value.s0123, min_value, min_value < value.s0123);
min_value = select(value.s4567, min_value, min_value < value.s4567);
max_value = select(value.s0123, max_value, max_value > value.s0123);
max_value = select(value.s4567, max_value, max_value > value.s4567);
}
for(; x < WIDTH; ++x)
{
float value = *(src_addr + x);
min_max_value.s0 = min(min_max_value.s0, value);
min_max_value.s1 = max(min_max_value.s1, value);
}
}
}
// Perform min/max reduction
min_value.s01 = min(min_value.s01, min_value.s23);
min_value.s0 = min(min_value.s0, min_value.s1);
max_value.s01 = max(max_value.s01, max_value.s23);
max_value.s0 = max(max_value.s0, max_value.s1);
min_max_value.s0 = min(min_max_value.s0, min_value.s0);
min_max_value.s1 = max(min_max_value.s1, max_value.s0);
if(min_max_value.s0 == min_max_value.s1)
{
min_max_value.s0 = 0.0f;
min_max_value.s1 = 1.0f;
}
// Store min and max
vstore2(min_max_value, 0, (__global float *)dst.ptr);
}
#endif // defined(WIDTH) && defined(HEIGHT) && defined(DEPTH)
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