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_mm_shuffle_pi16 (Streaming SIMD Extensions)
Returns a combination of the four words of a.
The selector n must be an immediate.
r0 := word (n&0x3) of a r1 := word ((n>>2)&0x3) of a r2 := word ((n>>4)&0x3) of a r3 := word ((n>>6)&0x3) of a