seeding the pot for 2.0 features [small vectors]

[Bill Baxter]

Joel C. Salomon wrote:

>> Effective vector code needs correct data alignment, instruction 
>> scheduling and register use.  Each of these issues is most effectively 
>> handled in the compiler/code gen stage, and therefore suggests that at 
>> the very least the compiler implementation ought to be aware of the 
>> vector type in some way.  By applying the "D Builtin Rationale," it is 
>> easy to see that vectors meet all the required criteria.
> 
> As I understand it, D’s inline assembler would be the tool to use for 
> this in a library implementation.  I don’t think the complex types use 
> SIMD, so the vectors can be the only things using those registers.

SIMD instructions can also be useful for complex operations, so I don't 
think that's a safe assumption to make.
http://www.intel.com/cd/ids/developer/asmo-na/eng/dc/pentium4/optimization/66717.htm

--bb