Where is stg_eqWord32 defined?

Hi, I'm trying to add a method to Data.Bits, which requires that I implement versions for 16 and 32-bit platforms. I was trying to find some examples to model my code on and randomly picked (==) for Word32. (==) for Word32 is implemented in terms of stg_eqWord32, but I cannot find that function defined anywhere. I assume it's generated somehow. Where should I look? Cheers, Johan