std.simd

[Manu]

Hey chaps (and possibly lasses?)

I've been slowly working a std.simd library, the aim of which is to provide
a lowest-level hardware-independent SIMD interface. core.simd implements
SSE currently for x86, other architectures are currently exposed via
gcc.builtins.
The purpose of std.simd, is to be the lowest level API that people make
direct use of, while still having as-close-to-direct-as-possible mapping to
the hardware opcodes, but still being portable. I would expect that custom,
more-feature-rich SIMD/vector/matrix/linear algebra libraries should be
built on top of std.simd in future, that way being portable to as many
systems as possible.

Now I've reached a question in the design of the library, I'd like to take
a general consensus.

lowest level vectors are defined by: __vector(type[width])
But core.simd also defines a bunch of handy 'nice' aliases for common
vector types, ie, float4, int4, short8, etc.

I want to claim those names into std.simd. They should be the lowest level
names that people use, and therefore associate with the std.simd
functionality.
I also want to enhance them a bit:
  I want to make them a struct that wraps the primitive rather than an
alias. I understand this single-POD struct will be handled the same as the
POD its self, is that right? If I pass the wrapper struct byval to a
function, it will be passed in a register as it should yeah?
  I then intend to then add CTFE support, and maybe some properties and
opDisplatch bits.

Does this sound reasonable?
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