buffer specific r/w property

Author: Arjun Ramaswami

api/src/fftfpga.c

@@ -292,10 +292,10 @@ fpga_t fftfpgaf_c2c_1d(int N, float2 *inp, float2 *out, int inv, int iter){
   printf("Launching%s FFT transform for %d iter \n", inv ? " inverse":"", iter);
 
   // Create device buffers - assign the buffers in different banks for more efficient memory access 
-  d_inData = clCreateBuffer(context, CL_MEM_READ_WRITE, sizeof(float2) * N * iter, NULL, &status);
+  d_inData = clCreateBuffer(context, CL_MEM_WRITE_ONLY, sizeof(float2) * N * iter, NULL, &status);
   checkError(status, "Failed to allocate input device buffer\n");
 
-  d_outData = clCreateBuffer(context, CL_MEM_READ_WRITE | CL_CHANNEL_2_INTELFPGA, sizeof(float2) * N * iter, NULL, &status);
+  d_outData = clCreateBuffer(context, CL_MEM_READ_ONLY | CL_CHANNEL_2_INTELFPGA, sizeof(float2) * N * iter, NULL, &status);
   checkError(status, "Failed to allocate output device buffer\n");
 
   // Copy data from host to device
@@ -400,9 +400,9 @@ fpga_t fftfpgaf_c2c_2d_ddr(int N, float2 *inp, float2 *out, int inv){
 
   cl_mem d_inData, d_outData, d_tmp;
 
-  d_inData = clCreateBuffer(context, CL_MEM_READ_WRITE, sizeof(float2) * N * N, NULL, &status);
+  d_inData = clCreateBuffer(context, CL_MEM_WRITE_ONLY, sizeof(float2) * N * N, NULL, &status);
   checkError(status, "Failed to allocate input device buffer\n");
-  d_outData = clCreateBuffer(context, CL_MEM_READ_WRITE, sizeof(float2) * N * N, NULL, &status);
+  d_outData = clCreateBuffer(context, CL_MEM_READ_ONLY, sizeof(float2) * N * N, NULL, &status);
   checkError(status, "Failed to allocate output device buffer\n");
   d_tmp = clCreateBuffer(context, CL_MEM_READ_WRITE | CL_CHANNEL_2_INTELFPGA, sizeof(float2) * N * N, NULL, &status);
   checkError(status, "Failed to allocate output device buffer\n");
@@ -525,10 +525,10 @@ fpga_t fftfpgaf_c2c_2d_bram(int N, float2 *inp, float2 *out, int inv){
 
   // Device memory buffers
   cl_mem d_inData, d_outData;
-  d_inData = clCreateBuffer(context, CL_MEM_READ_WRITE, sizeof(float2) * num_pts, NULL, &status);
+  d_inData = clCreateBuffer(context, CL_MEM_WRITE_ONLY, sizeof(float2) * num_pts, NULL, &status);
   checkError(status, "Failed to allocate input device buffer\n");
 
-  d_outData = clCreateBuffer(context, CL_MEM_READ_WRITE, sizeof(float2) * num_pts, NULL, &status);
+  d_outData = clCreateBuffer(context, CL_MEM_READ_ONLY, sizeof(float2) * num_pts, NULL, &status);
   checkError(status, "Failed to allocate output device buffer\n");
 
  // Copy data from host to device
@@ -648,9 +648,9 @@ fpga_t fftfpgaf_c2c_3d_bram(int N, float2 *inp, float2 *out, int inv) {
 
   // Device memory buffers
   cl_mem d_inData, d_outData;
-  d_inData = clCreateBuffer(context, CL_MEM_READ_WRITE | CL_CHANNEL_1_INTELFPGA, sizeof(float2) * N * N * N, NULL, &status);
+  d_inData = clCreateBuffer(context, CL_MEM_WRITE_ONLY | CL_CHANNEL_1_INTELFPGA, sizeof(float2) * N * N * N, NULL, &status);
   checkError(status, "Failed to allocate input device buffer\n");
-  d_outData = clCreateBuffer(context, CL_MEM_READ_WRITE | CL_CHANNEL_2_INTELFPGA, sizeof(float2) * N * N * N, NULL, &status);
+  d_outData = clCreateBuffer(context, CL_MEM_READ_ONLY | CL_CHANNEL_2_INTELFPGA, sizeof(float2) * N * N * N, NULL, &status);
   checkError(status, "Failed to allocate output device buffer\n");
 
  // Copy data from host to device