From: clemc@ccc.com (Clem Cole)
Subject: [TUHS] Early Unix function calls: expensive?
Date: Tue, 5 Jan 2016 12:42:00 -0500 [thread overview]
Message-ID: <CAC20D2O1GY_9QjDwQSNGNbOSkEo0uvK5nYt9qUG6+K1y7HbJOg@mail.gmail.com> (raw)
In-Reply-To: <20160105164642.GA20786@mercury.ccil.org>
On Tue, Jan 5, 2016 at 11:46 AM, John Cowan <cowan at mercury.ccil.org> wrote:
> A PDP-11 Fortran compiler could have followed such a subroutine call by
> a series of branch instructions and had the callee use MARK rather than
> RTS to return to the correct point in the jump table.
>
Could be - I was not there for that one but, I'll have to try to ask one or
two of the designers of the the 11 FTN compiler back end when I see them
next who was. Rich or Dave might know/remember. That said, some of the
folks on the simh mailing list might also remember like Tim or Bob.
That said, IIRC the PDP-11 on chip did not support it, so I suspect the FTN
compiler did not use it. I also know that in the past, when we had talked
about some of the silly instructions that were created in different ISPs
during lunch conversations, I have specific memories of some of the
compiler folks saying they could never figure out PDP-11's MARK either -
hence my comment about few did know how to put it to good use.
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next prev parent reply other threads:[~2016-01-05 17:42 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-03 23:35 Warren Toomey
2016-01-03 23:53 ` Tim Bradshaw
2016-01-04 0:01 ` John Cowan
2016-01-04 4:40 ` Armando Stettner
2016-01-04 8:52 ` Tim Bradshaw
2016-01-04 17:29 ` Larry McVoy
2016-01-04 13:50 ` Clem Cole
2016-01-05 2:00 ` Ronald Natalie
2016-01-05 15:13 ` Clem Cole
2016-01-05 16:46 ` John Cowan
2016-01-05 17:33 ` Diomidis Spinellis
2016-01-05 17:42 ` Clem Cole [this message]
2016-01-05 17:28 ` Ronald Natalie
2016-01-05 17:43 ` Clem Cole
2016-01-05 17:46 ` Ronald Natalie
2016-01-05 18:03 ` Warner Losh
2016-01-05 18:24 ` Ronald Natalie
2016-01-05 20:26 ` scj
2016-01-05 20:49 ` John Cowan
2016-01-05 23:24 ` Dave Horsfall
2016-01-05 23:55 ` Ronald Natalie
2016-01-04 0:00 ` John Cowan
2016-01-04 0:42 ` scj
2016-01-04 11:35 ` Tony Finch
[not found] <mailman.3.1451865187.15972.tuhs@minnie.tuhs.org>
2016-01-04 1:08 ` Johnny Billquist
2016-01-04 1:29 ` Larry McVoy
2016-01-04 1:31 Noel Chiappa
2016-01-04 2:24 ` scj
2016-01-04 4:24 ` Larry McVoy
2016-01-04 1:59 Norman Wilson
2016-01-04 15:09 ` John Cowan
2016-01-04 2:21 Clem Cole
2016-01-04 12:53 Noel Chiappa
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