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(nasm.info)Section B.4.28

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B.4.28. `CMPccSD': Scalar Double-Precision FP Compare
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     CMPSD xmm1,xmm2/mem64,imm8    ; F2 0F C2 /r ib  [WILLAMETTE,SSE2]

     CMPEQSD xmm1,xmm2/mem64       ; F2 0F C2 /r 00  [WILLAMETTE,SSE2]
     CMPLTSD xmm1,xmm2/mem64       ; F2 0F C2 /r 01  [WILLAMETTE,SSE2]
     CMPLESD xmm1,xmm2/mem64       ; F2 0F C2 /r 02  [WILLAMETTE,SSE2]
     CMPUNORDSD xmm1,xmm2/mem64    ; F2 0F C2 /r 03  [WILLAMETTE,SSE2]
     CMPNEQSD xmm1,xmm2/mem64      ; F2 0F C2 /r 04  [WILLAMETTE,SSE2]
     CMPNLTSD xmm1,xmm2/mem64      ; F2 0F C2 /r 05  [WILLAMETTE,SSE2]
     CMPNLESD xmm1,xmm2/mem64      ; F2 0F C2 /r 06  [WILLAMETTE,SSE2]
     CMPORDSD xmm1,xmm2/mem64      ; F2 0F C2 /r 07  [WILLAMETTE,SSE2]

   The `CMPccSD' instructions compare the low-order double-precision FP
values in the source and destination operands, and returns the result of
the comparison in the destination register. The result of each
comparison is a quadword mask of all 1s (comparison true) or all 0s
(comparison false).

   The destination is an `XMM' register. The source can be either an
`XMM' register or a 128-bit memory location.

   The third operand is an 8-bit immediate value, of which the low 3
bits define the type of comparison. For ease of programming, the 8
two-operand pseudo-instructions are provided, with the third operand
already filled in.  The  `Condition Predicates' are:

     EQ     0   Equal
     LT     1   Less-than
     LE     2   Less-than-or-equal
     UNORD  3   Unordered
     NE     4   Not-equal
     NLT    5   Not-less-than
     NLE    6   Not-less-than-or-equal
     ORD    7   Ordered

   For more details of the comparison predicates, and details of how to
emulate the "greater-than" equivalents, see *Note Section B.2.3::