[curves] curve25519-donna stack usage

[Mike Hamburg]

OK, I’ll let you know.

It might be that you can undo some of my size optimizations, and set compile options, to get some or all of the perf back.  For example, I don’t have a dedicated squaring routine because I’m optimizing for code size as well as stack size.

— Mike

> On Nov 9, 2016, at 1:01 PM, Jason A. Donenfeld <Jason at zx2c4.com> wrote:
> 
> Hi Mike,
> 
> Indeed the stack usage for 32bit is huge. On MIPS32r2 with -O3, donna
> uses 2872 bytes of stack!
> 
> I'd love to see your micro implementation! Let me know if you ever
> succeed in MITing that. The performance hit might be a bit of a
> bummer, though, but on 32bit 25% seems quite acceptable.
> 
> Jason

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