compressible_ops_compute_entropy.c

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/*
 Copyright (c) 2025, The Neko Authors
 All rights reserved.
 
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 modification, are permitted provided that the following conditions
 are met:
 
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     notice, this list of conditions and the following disclaimer.
 
   * Redistributions in binary form must reproduce the above
     copyright notice, this list of conditions and the following
     disclaimer in the documentation and/or other materials provided
     with the distribution.
 
   * Neither the name of the authors nor the names of its
     contributors may be used to endorse or promote products derived
     from this software without specific prior written permission.
 
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 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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#ifdef __APPLE__
#include <OpenCL/cl.h>
#else
#include <CL/cl.h>
#endif
 
#include <stdio.h>
#include <device/device_config.h>
#include <device/opencl/jit.h>
#include <device/opencl/prgm_lib.h>
#include <device/opencl/check.h>
#include "compressible_ops_compute_entropy_kernel.cl.h"
 
void opencl_compute_entropy(void *S_d, 
                            void *p_d, void *rho_d,
                            real gamma, 
                            int n) {
 
  cl_int err;
  
  if (compressible_ops_compute_entropy_program == NULL)
    opencl_kernel_jit(compressible_ops_compute_entropy_kernel, (cl_program *) &compressible_ops_compute_entropy_program);
 
  cl_kernel kernel = clCreateKernel((cl_program) compressible_ops_compute_entropy_program, 
                                    "compute_entropy_kernel", &err);
  CL_CHECK(err);
 
  CL_CHECK(clSetKernelArg(kernel, 0, sizeof(cl_mem), (void *) &S_d));
  CL_CHECK(clSetKernelArg(kernel, 1, sizeof(cl_mem), (void *) &p_d));
  CL_CHECK(clSetKernelArg(kernel, 2, sizeof(cl_mem), (void *) &rho_d));
  CL_CHECK(clSetKernelArg(kernel, 3, sizeof(real), &gamma));
  CL_CHECK(clSetKernelArg(kernel, 4, sizeof(int), &n));
 
  const int nb = (n + 256 - 1) / 256;
  const size_t global_item_size = 256 * nb;
  const size_t local_item_size = 256;
 
  CL_CHECK(clEnqueueNDRangeKernel((cl_command_queue) glb_cmd_queue, kernel, 1,
                                  NULL, &global_item_size, &local_item_size,
                                  0, NULL, NULL));
  CL_CHECK(clReleaseKernel(kernel));
}