Above & Below
Posted: Mon Jan 19, 2009 4:59 pm
Are these synonyms for greater then or less then? If not what do they mean?
Not precisely. The difference involves signed vs. unsigned values.
If you put the value 0xdfa87590 into a 32bit register, and CMP it with 0:
"above" will be true (because we are looking at an unsigned value)
but "greater" will be false, because 0xdfa87590 is a negative (signed) number.
The synonym for greater is "not less or equal".
The synonyms for "above" are much more complicated, since they involve both "below" and "carry" (carry is a synonym for below).