Comment by spc476
10 hours ago
Some idiomatic C code to copy a string (I'm not saying this is good C code, but it's just an example):
while(*d++ = *s++)
;
On the Motorola 68000 (based somewhat on the PDP-11) the code would look like:
loop: move.b (a0)+,d0
move.b d0,(a1)+
bne loop
while on the x86 line, it would be:
loop: mov al,[rsi]
mov [rdi],al
inc rsi ; extra instruction!
inc rdi ; extra instruction!
cmp al,0
jne loop
Yes, there are better ways to write that code for both the 68K and x86, but I hope this gets the point across.
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