> > I notice that you haven't provided any way to access the ALU carry flag. > > This > > is going to make unsigned comparisons and doubleword (64-bit) arithmetic > > very > > hard. It's not impossible (I've worked on compiler ports for such > > machines), > > but gets really ugly. FWIW MIPS exposes it via the sltu instruction.
> Good point, though I've seen Tim's take on this, and I can't imagine at > the moment what we'll use 64 bit datatypes for. But, there is room for > it in the instruction word if we need it, so we can document it for the > moment, and hope we'll discover the need before this goes onto an ASIC. This is probably obvious, but better safe than sorry. Write all the code for this before building the ASIC. Run and test the code in a simulator or on OGD1. Write test cases for every little nitpicky detail. _______________________________________________ Open-graphics mailing list [email protected] http://lists.duskglow.com/mailman/listinfo/open-graphics List service provided by Duskglow Consulting, LLC (www.duskglow.com)
