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(nasm.info)Section B.4.150

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B.4.150. `MAXSS': Return Scalar Single-Precision FP Maximum
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     MAXSS xmm1,xmm2/m32           ; F3 0F 5F /r     [KATMAI,SSE]

   `MAXSS' compares the low-order single-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/m32) would be returned. If
source2 (xmm2/m32) is an SNaN, this SNaN is forwarded unchanged to the
destination (i.e., a QNaN version of the SNaN is not returned). The
high three doublewords of the destination are left unchanged.