I have a Nikon D3x, a Nikon F6 and a Nikon F3/T.
It is my understanding that, on a digital camera, "exposure compensation" actually alters signal amplification, similar but not identical to changing the sensitivity.
Both the F6 and the F3/T offer exposure compensation. Neither of these cameras appear to be altering shutter speed or diaphragm opening in accordance to exposure compensation. Yet the resulting images are properly exposed as per the compensation.
For example, setting the exposure compensation of the F6 to -5 EV does not audibly change its shutter speed, nor does the diaphragm opening visibly change. In fact the duration of the exposure appears to be unaltered.
So how does a film camera perform exposure compensation?
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