|Can optimization-specific codes exist ? email@example.com (Chango Cho) (1999-09-28)|
|Re: Can optimization-specific codes exist ? firstname.lastname@example.org (1999-10-03)|
|Re: Can optimization-specific codes exist ? email@example.com (1999-10-04)|
|Re: Can optimization-specific codes exist ? firstname.lastname@example.org (1999-10-04)|
|Re: Can optimization-specific codes exist ? email@example.com (Tom Lane) (1999-10-06)|
|Re: Can optimization-specific codes exist ? firstname.lastname@example.org (1999-10-06)|
|From:||Tom Lane <email@example.com>|
|Date:||6 Oct 1999 02:10:20 -0400|
|Organization:||Netcom Online Communications Services|
|References:||99-09-118 99-10-011 99-10-016|
> : In any event, the only PDP I can think of that was user microprogrammable
> : was the not terribly popular PDP-11/60 and as far as I can tell, the only
> : thing that people did with it was some DSP stuff. -John]
firstname.lastname@example.org (A Johnstone) writes:
> A bit off topic, but John is right: only the PDP 11/60 had the
> Writeble Control Store option and not many of those were sold.
Au contraire: the old HYDRA/C.mmp project at CMU made good use of
user-provided microcode in PDP 11/40E processors. 11/60s didn't exist
when we were building C.mmp (*). But AFAIR the microcode was all for
kernel operations (interprocessor semaphores and suchlike) so perhaps
this is too far off topic for comp.compilers.
regards, tom lane
(*) That was the one with 16 processors, 16 memory modules, and
a fat crossbar switch in the middle...
[Could anyone reprogram 11/40s, or did you have to be friends with
Gordon Bell? -John]
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