Gregory Ewing wrote:
Mel wrote:
You could think of it as a not bad use of the design principle "Clear
The Simple Stuff Out Of The Way First". Destinations are commonly a
lot simpler than sources
That's not usually true in assembly languages, though,
where the source and destination are both very restricted
and often about the same complexity.
That's not to say that right-to-left is the wrong way
to do it in an assembly language, but there are less
misleading words than "move" that could be used.
Z80 assembly language uses "load", which makes things
considerably clearer:
LD A, B ; load A with B
Some processors distinguish between "load" (memory to register) and
"store" (register to memory), and the destination and LHS operand of
binary operations might be the same register, for example:
CLC ; clear the carry
LDA first ; accumulator := byte at first
ADCA second ; accumulator := accumulator + byte at second + carry
STA result ; byte at third := accumulator
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