Vectorized Code on GPU

Question

I am using OpenCL to execute a procedure on different GPUs and CPUs simultaneously to get a high performance results. The Intel OpenCL is always showing a message that the Kernel is not vectorized, so it will only run on different cores but will not run using SIMD instructions. My question is, if I rewrite the code so that the SIMD instruction can be exploit with the OpenCL code, will it increase the GPU Performance also?

Answer 1

Yes - but beware that this is not necessary on AMD GCN based APU/GPU or Nvidia Fermi or higher GPU hardware for good performance -they do scalar operations with great utilization. CPUs and Intels GPU however can greatly benefit via SIMD instructions which is what the vector operations boil down to.