cufft and cublas


i am getting fft of two different data sets using cufft . I am keeping the data on device itself.

for example deviceData and rdeviceData are matrix of size 8k*8k and 8k

Now i want to take multiplication using cublas …

double *x_inc, *y_inc;
    cublasHandle_t h;
    cublasSetPointerMode(h, CUBLAS_POINTER_MODE_DEVICE);
    cublascdotc(deviceData, rdeviceData, x_, 1, y_, 1, deviceData);

will it work ?? please help me out