On Mon, 20 May 2013, Sanjay Lal wrote:

> (1) Newer versions of the MIPS architecture define scratch registers for 
> just this purpose, but since we have to support standard MIPS32R2 
> processors, we use the DDataLo Register (CP0 Register 28, Select 3) as a 
> scratch register to save k0 and save k1 @ a known offset from EBASE.

 That's rather risky as the implementation of this register (and its 
presence in the first place) is processor-specific.  Do you maintain a 
list of PRId values the use of this register is safe with?

  Maciej
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