8086 (was Re: more talking to the press.)

From: ben franchuk <bfranchuk_at_jetnet.ab.ca>
Date: Sat Nov 15 12:37:12 2003

Fred N. van Kempen wrote:
> On Fri, 14 Nov 2003, Hans Franke wrote:
>
>
>>BTW: above example is exactly one thing why I hate C.
>>basicly every compiler will generate a stupid loop, while
>>in assembly a REP STOSW would do the trick at maximum
>>speed possible.
>
> Thats why we invented code peeking and code optimiziers,
> Hans. A decent optimizer for x86 *will* know to replace
> that loop with a REP-prefixed instruction.
>
> --f
But the REP prefix has a bug, on the early machines if
I remember reading right, is you can't have interupts
enabled. OH wait, you only could run DOS and you did not
need NO STINKING INTERUPTS!, and serial lines ran faster than
300 baud!
Received on Sat Nov 15 2003 - 12:37:12 GMT