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FCOMP Compare Real and Pop Exception Flags: I D
FCOMP [source]
Logic: CMP ST, source
sets condition codes in the status word as follows and then
pops the stack:
C3 C2 C1 C0 Means
-- -- -- -- -----------
0 0 ? 0 ST > source
0 0 ? 1 ST < source
1 0 ? 0 ST = source
1 1 ? 1 ST not comparable to source
FCOMP operates like FCOM, except that it also pops the stack. It
compares two real numbers and leaves the result encoded in the status
word as shown above. If no source is specified, ST(1) is compared to
ST. Otherwise, the source is compared to ST.
--------------------------------------------------------------------------
Operands Clocks Bytes Example
FCOMP reg 42-52 3 FCOMP
FCOMP MEMORY_REAL 63-77+EA 5 FCOMP REAL_NUMBER
--------------------------------------------------------------------------
See Also:
FCOM
FCOMPP
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