std.math performance (SSE vs. real)

[Walter Bright via Digitalmars-d]

On 7/3/2014 8:36 AM, Sean Kelly wrote:
>> Per the D spec, 'real' will be the longest type supported by the native hardware.

It's not necessary that real be long double - but it is necessary that long 
double be callable from D.

Case in point: long double on Win64 is accessible with D's "double", but D also 
supports 80 bit "real".