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(nasm.info)Section B.4.319

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B.4.319. `UCOMISS': Unordered Scalar Single-Precision FP compare and set EFLAGS
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     UCOMISS xmm1,xmm2/m128        ; 0F 2E /r        [KATMAI,SSE]

   `UCOMISS' compares the low-order single-precision FP numbers in the
two operands, and sets the `ZF', `PF' and `CF' bits in the `EFLAGS'
register. In addition, the `OF', `SF' and `AF' bits in the `EFLAGS'
register are zeroed out. The unordered predicate (`ZF', `PF' and `CF'
all set) is returned if either source operand is a `NaN' (`qNaN' or
`sNaN').