std.math performance (SSE vs. real)

[Chris Cain via Digitalmars-d]

On Monday, 30 June 2014 at 21:51:22 UTC, H. S. Teoh via 
Digitalmars-d wrote:
> How do you implement 80-bit reals in the library?

Is it a legitimate problem to do so? My feeling is that it should 
be possible if it's possible to implement it in C or asm since 
it's possible to do everything in D that is possible to do in C 
or asm.