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CMP
COMPARE
CMP
Operation:
(LSRC) - (RSRC)
Description:
CMP destination, source
CMP
(Compare) subtracts the source from the
destination, which may be bytes or words, but
does not return the result. The operands are
unchanged,
but
the flags are updated and can
be tested by a subsequent conditional jump
instruction.
CMP
updates AF, CF, OF, PF,
Flags Affected:
2-66
AF, CF, OF, PF, SF, ZF
SF and ZF. The comparison reflected in the
flags
is
that
of
the destination to the source.
If
a
CMP
instruction
is
followed by a
JG
(jump
if
greater) instruction, for example, the jump
is
taken if the destination operand
is
greater
than the source operand.