Add Vector<int8_t, 64> Support

[JoshuaWierenga]

See #2 for info.

Constructors

Vector(int32_t) => _mm_set1_pi8
Vector(int32_t, int32_t) => _mm_setr_pi8

Arithmetic Operators

operator+ => _mm_add_pi8/_m_paddb
operator- => _mm_sub_pi8/_m_psubb
operator* => convert to 2 x 16 bit vectors to access mullo?
operator/ =>
operator% =>

Bitwise Operators

operator^ => _mm_xor_si64/_m_pxor
operator| => _mm_or_si64/_m_por
operator& => _mm_and_si64/_m_pand
operator~ => _mm_andnot_si64/_m_pandn with all ones as second argument
operator<< =>
operator>> =>

"Bitwise" Operators

operator<< => insert into stream
operator>> => extract from stream

(Compound) Assignment Operators

operator= => Assignment Operator
operator+= => _mm_add_pi8/_m_paddb + Assignment
operator-= => _mm_sub_pi8/_m_psubb + Assignment
operator*= =>
operator/= =>
operator%= =>
operator&= => _mm_and_si64/_m_pand + Assignment
operator|= => _mm_or_si64/_m_por + Assignment
operator^= => _mm_xor_si64/_m_pxor + Assignment
operator<<= => convert to 2 x 16 bit vectors and use _mm_sll_pi16?
operator>>= => convert to 2 x 16 bit vectors and use _mm_srl_pi16/_mm_sra_pi16?

Comparision/Relational Operators

operator== => _mm_cmpeq_pi8/_m_pcmpeqb
operator!= => not(equal)
operator> => _mm_cmpgt_pi8/_m_pcmpgtb
operator< => and(not(equal), not(greater)) or and(not(and(equal, greater))) depends which is quicker
operator>= => and(equal, greater)
operator<= => not(greater)

Logical Operators

operator! =>
operator&& =>
operator|| =>

Variation Operators

operator++ => _mm_add_pi8/_m_paddb?
operator++(int) => _mm_add_pi8/_m_paddb?
operator-- => _mm_sub_pi8/_m_psubb?
operator--(int) => _mm_sub_pi8/_m_psubb?

Conversion Operators

operator std::array => Array Cast

static Blend => ? Actual blendv was added in sse4.1, repeated use of the unpack instructions might work.
Nope, just use or(and(a, c), andnot(b, c))

Currently unsupported/not considered functions:

_mm_adds_pi8/_m_paddsb
_mm_adds_pu8/_m_paddusb
_mm_subs_pi8/_m_psubsb
_mm_subs_pu8/_m_psubusb
_mm_set_pi8
_mm_unpackhi_pi8/_m_punpckhbw
_mm_unpacklo_pi8/_m_punpcklbw