[LLVMdev] mips16 whitepaper

Chris Lattner clattner at apple.com
Tue Jan 22 22:12:45 PST 2013

On Jan 21, 2013, at 4:49 PM, Reed Kotler <rkotler at mips.com> wrote:

> On 01/21/2013 03:28 PM, Sean Silva wrote:
>> Please add this to <http://llvm.org/docs/CompilerWriterInfo.html>
>> (docs/CompilerWriterInfo.rst)
>> -- Sean Silva
> I will. I owe a very long mips16 write up , especially for floating point when I'm done.
> It's very complicated the way they implemented hard float in gcc and it is not documented.
> It took me some thinking and study to unravel it all. They do different things for pic/non pic
> and the interoperability with mips32 is what makes in complicated.
> I have come up with another totally different way to implement floating point in mips16 which I hope
> to have time to do in the future. It's probably about 2 months work but management wants me
> to do this gcc way first.
> My alternate design is a more true floating point implementation as opposed to the gcc method which is more or less a variant of soft-float which uses different runtime routines but it has a lot of complications with mips32 interoperability whereas my scheme has none of these issues and does not need any special helper functions.

Hi Reed,

If you want to write something "lasting" that is kept up to date, please work with Sean (who, btw, is completely amazing) to add something to docs/.  OTOH, If you want to capture something about the state of mips16 and the implementation thereof, it would probably make sense to add something to blog.llvm.org.  Let me know and I can send you an invitation.


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