FINCSTP
Usage: FINCSTP Modifies flags: See below.
Adds one to the TOP field of the FPU status word . If the TOP field contains a 7, it is set to 0. The effect of this instruction is to rotate the stack by one position. The FPU data registers and tag register are not affected.
Increment Floating-Point Stack Pointer
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.
The C1 flag is set to 0. The C0, C2, and C3 flags are undefined.
EXAMPLE:
fincstp