Constructing Floating Point Unit with Chisel?

[Shang Li]

Hi,

I just started using chisel, it seems to be way more powerful than writing bare-metal verilog.

I wanted to use chisel to build a hardware floating point unit supporting IEEE754 standard (i.e. generate verilog code to construct FPU). However, I've read through your documentations on https://chisel.eecs.berkeley.edu/documentation.html but didn't find anything mentioned floating point. But I found the Flo.scala and FP.scala source files in your github repo. Also it says "Sizeable standard library including floating-point units" on your homepage. So I'm wondering is floating point actually support? If so any pointers where I should go?

Thanks in advance,

Shang

[Andrea Peruffo]

+1

A lot interested in the status of Floating point numbers.

Thanks

Andrea

[Stephen Tridgell]

I think you are looking for this: https://github.com/ucb-bar/berkeley-hardfloat

[Ganesh Venkatesh]

This implementation performs FP as single-cycle operation. Is there an easy way to pipeline a unit in chisel for higher frequency. I see couple of publications on this but I don't see any examples of how it is done in practice.

Thanks

Ganesh

[Donggyu Kim]

CAD tools automatically retime it if you added shift registers for them.