By: Foo_ (foo.delete@this.nomail.com), April 27, 2012 8:21 am
Room: Moderated Discussions
EduardoS (no@spam.com) on 4/26/12 wrote:
---------------------------
>anonymous (no@spam.com) on 4/26/12 wrote:
>---------------------------
>>>>1. AGUs do INC/DEC for PUSH/POP only
>>>>6. Only ALUs produce and consume flags
>>
>>in English: AGUs can do increments/decrements for PUSH/POP, but not INC/DEC
>
>A kind of post/pre increment/decrement load/store wich is common on RISC?
>
Well, that's exactly what PUSH/POP are. On the Z80 some people would abuse them for that: they gave a fast 16-bit load/store with pre-decrement/post-increment (after disabling interrupts, of course).
---------------------------
>anonymous (no@spam.com) on 4/26/12 wrote:
>---------------------------
>>>>1. AGUs do INC/DEC for PUSH/POP only
>>>>6. Only ALUs produce and consume flags
>>
>>in English: AGUs can do increments/decrements for PUSH/POP, but not INC/DEC
>
>A kind of post/pre increment/decrement load/store wich is common on RISC?
>
Well, that's exactly what PUSH/POP are. On the Z80 some people would abuse them for that: they gave a fast 16-bit load/store with pre-decrement/post-increment (after disabling interrupts, of course).



