Whoops, this is for the example on page 15... I sent this once without being subscribed, and somehow messed up the copy/paste.
On Fri, Mar 5, 2010 at 4:11 PM, Brian Haag <[email protected]> wrote: > re: indexed addressing mode > > In the example given, we specify address 2002 with 4 in the index register, > giving us 2006 (the start of the second word). > > For x86 processors we can use a multiplier, so putting 3 in the index > register with a multiplier of 1 would get us the contents of address 2005. > > However, the next example is a 3 in the index register with a multiplier of > 4, resulting in reading from address 2014, the start of the fourth word. > > Now, it's easy enough to see that 2002 + (3 x 1) = 2005, and 2002 + (3 x 4) > = 2014. What seems weird to me is that the multiplier determines WHERE > in the word I end up reading. 1 gets me the fourth byte, 2 the third, 3 > the second, and 4 the first. > > Am I thinking about this correctly? Am I wrong to think it's a little > weird? > > Thanks, if anyone's actually listening. :) >
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