[Info-vax] Whither VMS?

[glen herrmannsfeldt]

Bob Eager <rde42 at spamcop.net> wrote:
< On Fri, 09 Oct 2009 01:35:48 +0000, glen herrmannsfeldt wrote:
 
<> IA32 has special instructions for counting (in CX, ECX) and for
<> incremented address load/store.  It is probably easier and maybe faster
<> to do the counted loop.  Some loops can be done with one instruction
<> with a LOOP prefix.
 
< (a) LOOP isn't a prefix
< (b) on modern CPUs, it's avoided because it's a very slow instruction..

Oops, it is the REP (and similar) prefixes that I meant to say,
which is a prefix.  No idea how fast it is.

-- glen