Check for double support in OpenCL

common.h

@@ -93,6 +93,14 @@ struct badmemsize : public std::exception
     }
 };
 
+struct nodouble : public std::exception
+{
+    virtual const char * what () const throw ()
+    {
+        return "Device does not support double precision, please use --float";
+    }
+};
+
 template < typename T >
 void check_solution(void* a_in, void* b_in, void* c_in)
 {

ocl-stream.cpp

@@ -165,6 +165,9 @@ int main(int argc, char *argv[])
         std::string name = getDeviceName(device);
         std::cout << "Using OpenCL device " << name << std::endl;
 
+        // Check device can do double precision if requested
+        if (!useFloat && !device.getInfo<CL_DEVICE_DOUBLE_FP_CONFIG>()) throw nodouble();
+
         // Check buffers fit on the device
         status = "Getting device memory sizes";
         cl_ulong totalmem = device.getInfo<CL_DEVICE_GLOBAL_MEM_SIZE>();