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(nasm.info)Section B.4.149

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B.4.149. `MAXSD': Return Scalar Double-Precision FP Maximum
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     MAXSD xmm1,xmm2/m64           ; F2 0F 5F /r     [WILLAMETTE,SSE2]

   `MAXSD' compares the low-order double-precision FP numbers from xmm1
and xmm2/mem, and stores the maximum value in xmm1. If the values being
compared are both zeroes, source2 (xmm2/m64) would be returned. If
source2 (xmm2/m64) is an SNaN, this SNaN is forwarded unchanged to the
destination (i.e., a QNaN version of the SNaN is not returned). The
high quadword of the destination is left unchanged.