start on SIMD documentation

[bearophile]

Walter:

> What's our vector, Victor?
> http://www.youtube.com/watch?v=fVq4_HhBK8Y

Thank you Walter :-)


> If int4 is out, I'd prefer something like vint4. Something short.

Current names:

void16
double2
float4
byte16
ubyte16
short8
ushort8
int4
uint4
long2

Your suggestion:

vvoid16
vdouble2
vfloat4
vbyte16
vubyte16
vshort8
vushort8
vint4
vuint4
vlong2


My suggestion:

void16v
double2v
float4v
byte16v
ubyte16v
short8v
ushort8v
int4v
uint4v
long2v

Bye,
bearophile