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(nasm.info)Section B.4.148

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B.4.148. `MAXPS': Return Packed Single-Precision FP Maximum
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     MAXPS xmm1,xmm2/m128          ; 0F 5F /r        [KATMAI,SSE]

   `MAXPS' performs a SIMD compare of the packed single-precision FP
numbers from xmm1 and xmm2/mem, and stores the maximum values of each
pair of values in xmm1. If the values being compared are both zeroes,
source2 (xmm2/m128) would be returned. If source2 (xmm2/m128) is an
SNaN, this SNaN is forwarded unchanged to the destination (i.e., a QNaN
version of the SNaN is not returned).