Re: [WIP/RFC] MIPS registers overhaul

[Andrew Cagney <ac131313@redhat.com>]

> At Sat, 14 Jun 2003 21:36:04 -0400, Andrew Cagney wrote:
> 
>> Chris?
> 
> 
> Sorry, I must have missed that msg...  8-)
> 
> 
> 
>> That isn't quite the detail I was looking for.  Does the code need to 
>> look like:
>> 
>> save::
>> 	save FSR
>> 	if (FSR & FR)
> 
>    *** when FR == 1, it's 32 64-bit registers.  so, invert.
> 
>> 	  save 32x32 FP
> 
>    *** or, save 16 (even) 64-bit FP registers, if MIPS2 or later.
>    *** in fact, on MIPS2 and later, better to do that, since it'll be
>    *** more efficient (fewer instructions).

But see my other post.  Using a double store gives different behavior to 
two single stores.  I guess the kernel can do a double store, only then 
swapping the registers before supplying them to gdb.

Andrew