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(nasm.info)Section B.4.85

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B.4.85. `FINCSTP': Increment Floating-Point Stack Pointer
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     FINCSTP                       ; D9 F7                [8086,FPU]

   `FINCSTP' increments the `top' field in the floating-point status
word. This has the effect of rotating the FPU register stack by one, as
if the register stack had been popped; however, unlike the popping of
the stack performed by many FPU instructions, it does not flag the new
`ST7' (previously `ST0') as empty. See also `FDECSTP' (*Note Section
B.4.75::).