> I hope you won't mind me now completely moving to the second part of my > initial query. Can you tell me about the relation between the hardfloat > submodule and the FPU.scala file? > > If all of the FPU is generated based on the HDL code of the hardfloat > submodule, what does FPU.scala actually do? > > Thanks a lot, > > Aleksandar hardfloat is where the parameterized blocks that execute FP operations reside. They do the "math" stuff, if you will. Blocks like MulAddRecFN.scala (multiply-add in a recoded format for some set-at-instantiation-time N-bit floating point number). Rocket's FPU.scala is where you instantiate these units, set their values (say, to get a double-precision FMA unit), and do all of the yucky plumbing into and out of the unit. FPU.scala contains the FP register file, it manages the packing and unpacking into and out of the the recoded format, it manages the condition flags, and more. -Chris