Intel® FPGA SDK for OpenCL™ Standard Edition: Best Practices Guide

ID 683176
Date 9/24/2018
Document Table of Contents

3.6. Maintaining Similar Structures for Vector Type Elements

If you update one element of a vector type, update all elements of the vector.

The following code example illustrates a scenario where you should update a vector element:

__kernel void update (__global const float4 * restrict in,
                      __global const float4 * restrict out)
	  size_t gid = get_global_id(0);

	  out[gid].x = process(in[gid].x);
	  out[gid].y = process(in[gid].y);
	  out[gid].z = process(in[gid].z);
	  out[gid].w = 0; //Update w even if that variable is not required.