Re: DImode operations

[Dave Korn <dave dot korn dot cygwin at googlemail dot com>]

daniel tian wrote:
> Another problem I found when hacking other port.
> Do I need to write SF, DF move operations?
> And basic arithmetic insn patterns like ADD, SUB in DImode?
> 
> Because in CRX port (as I knew, there is no float point unit in this
> cpu),  DI,SF,DF mode have 'move' operation. and there are subtract,
> add operations in DImode.
> 
> So I mean whether I have to achieve all those operations. because my
> target is 32bit RISC chip, no 64bit arithmetic operations and no float
> point unit.
> 
> It's really tough to build libgcc succeeded.
> 
> Can your guys give me some suggestions.

  I think you can enable soft-fp in your t- target makefile fragment and then
you need only implement trivial register to register fp moves for everything
to basically work, but I haven't checked so I may have remembered wrong.

    cheers,
      DaveK