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(nasm.info)Section B.4.293

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B.4.293. `SHUFPS': Shuffle Packed Single-Precision FP Values
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     SHUFPS xmm1,xmm2/m128,imm8    ; 0F C6 /r ib     [KATMAI,SSE]

   `SHUFPS' moves two of the packed single-precision FP values from the
destination operand into the low quadword of the destination operand;
the upper quadword is generated by moving two of the single-precision
FP values from the source operand into the destination. The select
(third) operand selects which of the values are moved to the
destination register.

   The select operand is an 8-bit immediate: bits 0 and 1 select the
value to be moved from the destination operand the low doubleword of
the result, bits 2 and 3 select the value to be moved from the
destination operand the second doubleword of the result, bits 4 and 5
select the value to be moved from the source operand the third
doubleword of the result, and bits 6 and 7 select the value to be moved
from the source operand to the high doubleword of the result.