A.5.229 PINSRW: Insert Word
PINSRW mm,r16/r32/m16,imm8 ;0F C4 /r ib [KATMAI,MMX]
PINSRW xmm,r16/r32/m16,imm8 ;66 0F C4 /r ib [WILLAMETTE,SSE2]
PINSRW loads a word from a 16-bit register (or the low half of a 32-
bit register), or from memory, and loads it to the word position in
the destination register, pointed at by the count operand (third
operand). If the destination is an MMX register, the low two bits of
the count byte are used, if it is an XMM register the low 3 bits are
used. The insertion is done in such a way that the other words from the
destination register are left untouched.