OpenCL type conversion from vector types to boolean?

You should use all to test the condition is verified on all components of the vector checkCoord == (uint4)(0,0,0,0) is an int4 with components either 0 (false) or (uint)-1 (true).

You should use all to test the condition is verified on all components of the vector. CheckCoord == (uint4)(0,0,0,0) is an int4 with components either 0 (false) or (uint)-1 (true). If ( all( checkCoord == (uint4)(0,0,0,0) ) ) { ... } According to the OpenCL specs (6.3.E), you could also write if ( all( checkCoord == 0 ) ) { ... }.

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