MRAB wrote:
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
Guys, you sound like people arguing about old school TV show / series
like star treck :-)
- "He was wearing a blue suit !"
- "Check episode number 29, he appeared with a pink one!"
I'm glad I'm too young to had to code in assembler, or to bear the
vision of those unlikely space suits from the 70's ;-)
JM
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