(1) visc-rt.cpp modified to have correct opencl read/write flags depending on

    in out attributes of arguments
(2) check-point commit in preparing mri-q benchmark

llvm/projects/visc-rt/visc-rt.cpp

@@ -113,9 +113,9 @@ void* llvm_visc_ptx_argument_ptr(void* graphID, void* input, int arg_index, size
   cl_int errcode;
   cl_mem_flags clFlags;
   if(isInput && isOutput) clFlags = CL_MEM_READ_WRITE | CL_MEM_COPY_HOST_PTR;
-  else if(isInput)        clFlags = CL_MEM_READ_WRITE | CL_MEM_COPY_HOST_PTR;
-  else if(isOutput)       clFlags = CL_MEM_READ_WRITE;
-  else                    clFlags = CL_MEM_READ_WRITE | CL_MEM_COPY_HOST_PTR;
+  else if(isInput)        clFlags = CL_MEM_READ_ONLY | CL_MEM_COPY_HOST_PTR;
+  else if(isOutput)       clFlags = CL_MEM_WRITE_ONLY;
+  else                    clFlags = CL_MEM_READ_ONLY | CL_MEM_COPY_HOST_PTR;
 
   cl_mem d_input = clCreateBuffer(Context->clGPUContext, clFlags, size, input, &errcode);
   checkErr(errcode, CL_SUCCESS, "Failure to allocate memory on device");

llvm/test/VISC/parboil/benchmarks/mri-q/src/opencl/kernels.cl

 #include "macros.h"
 
 #define NC  4
+#define KERNEL_Q_K_ELEMS_PER_GRID 256
 #define COARSE_GENERAL
 // #define COARSE_SPEC NC
 

llvm/test/VISC/parboil/benchmarks/mri-q/src/opencl/macros.h

 #ifndef __MACROS__
-#define __MACROS__
+//#define __MACROS__
 
 #define PI   3.1415926535897932384626433832795029f
 #define PIx2 6.2831853071795864769252867665590058f
@@ -9,7 +9,7 @@
 
 #define KERNEL_PHI_MAG_THREADS_PER_BLOCK 256 /* 512 */
 #define KERNEL_Q_THREADS_PER_BLOCK 256
-#define KERNEL_Q_K_ELEMS_PER_GRID 1024
+#define KERNEL_Q_K_ELEMS_PER_GRID 256
 
 struct kValues {
   float Kx;