The Programming Guide has instructions for doubles (%ld) and vector types (e.g. %v4f), but not half-precision floats.
The Programming Guide has instructions for doubles (%ld) and vector types (e.g. %v4f), but
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The Programming Guide has instructions for doubles (%ld) and vector types (e.g. %v4f), but not half-precision floats.
Normally in C, varargs arguments are automatically promoted to larger datatypes, such as float to double. The OpenCL documentation seems to imply that a similar promotion applies there.
Therefore a simple
%fshould work also for half-length floats.