/usr/lib/python2.7/dist-packages/pyFAI/resources/openCL/reduction_test4.cl is in python-pyfai 0.15.0+dfsg1-1.
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* Project: Azimuthal integration for PyFAI.
* Reduction Kernels
*
*
* Copyright (C) 2014-2018 European Synchrotron Radiation Facility
* Grenoble, France
*
* Principal authors: Giannis Ashiotis <giannis.ashiotis@gmail.com>
* J. Kieffer (kieffer@esrf.fr)
* Last revision: 20/10/2014
*
* 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 "for_eclipse.h"
__kernel
void reduce1(__global float2* buffer,
__const int length,
__global float4* preresult) {
int global_index = get_global_id(0);
int global_size = get_global_size(0);
float4 accumulator;
accumulator.x = INFINITY;
accumulator.y = -INFINITY;
accumulator.z = INFINITY;
accumulator.w = -INFINITY;
// Loop sequentially over chunks of input vector
while (global_index < length/2) {
float2 element = buffer[global_index];
accumulator.x = (accumulator.x < element.s0) ? accumulator.x : element.s0;
accumulator.y = (accumulator.y > element.s0) ? accumulator.y : element.s0;
accumulator.z = (accumulator.z < element.s1) ? accumulator.z : element.s1;
accumulator.w = (accumulator.w > element.s1) ? accumulator.w : element.s1;
global_index += global_size;
}
__local float4 scratch[WORKGROUP_SIZE];
// Perform parallel reduction
int local_index = get_local_id(0);
scratch[local_index] = accumulator;
barrier(CLK_LOCAL_MEM_FENCE);
int active_threads = get_local_size(0);
while (active_threads != 1)
{
active_threads /= 2;
if (local_index < active_threads)
{
float4 other = scratch[local_index + active_threads];
float4 mine = scratch[local_index];
mine.x = (mine.x < other.x) ? mine.x : other.x;
mine.y = (mine.y > other.y) ? mine.y : other.y;
mine.z = (mine.z < other.z) ? mine.z : other.z;
mine.w = (mine.w > other.w) ? mine.w : other.w;
/*
float2 tmp;
tmp.x = (mine.x < other.x) ? mine.x : other.x;
tmp.y = (mine.y > other.y) ? mine.y : other.y;
scratch[local_index] = tmp;
*/
scratch[local_index] = mine;
}
barrier(CLK_LOCAL_MEM_FENCE);
}
if (local_index == 0) {
preresult[get_group_id(0)] = scratch[0];
}
}
__kernel
void reduce2(__global float4* preresult,
__global float4* result) {
__local float4 scratch[WORKGROUP_SIZE];
int local_index = get_local_id(0);
scratch[local_index] = preresult[local_index];
barrier(CLK_LOCAL_MEM_FENCE);
int active_threads = get_local_size(0);
while (active_threads != 1)
{
active_threads /= 2;
if (local_index < active_threads)
{
float4 other = scratch[local_index + active_threads];
float4 mine = scratch[local_index];
mine.x = (mine.x < other.x) ? mine.x : other.x;
mine.y = (mine.y > other.y) ? mine.y : other.y;
mine.z = (mine.z < other.z) ? mine.z : other.z;
mine.w = (mine.w > other.w) ? mine.w : other.w;
/*
float2 tmp;
tmp.x = (mine.x < other.x) ? mine.x : other.x;
tmp.y = (mine.y > other.y) ? mine.y : other.y;
scratch[local_index] = tmp;
*/
scratch[local_index] = mine;
}
barrier(CLK_LOCAL_MEM_FENCE);
}
if (local_index == 0) {
result[0] = scratch[0];
}
}
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