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Article #621780Re: Who Wrote Fortran IV, Level G?
From: Peter Flass
Date: Wed, 11 Apr 2018 00:51
Date: Wed, 11 Apr 2018 00:51
27 lines
2686 bytes
2686 bytes
John Levine <jo...@taugh.com> wrote:
> In article <pagbfn$t1o$1...@dont-email.me>,
> Sarr Blumson <sarr.blumson@alum.dartmouth.orgq> wrote:
>> Digitek. They actually had a compiler written for a stack oriented
>> pseudo machine that they then wrote interpreters for to fit on small
>> machines. I believe the first was the SDS 910 but many small
>> hardware builders were customers. F4/40 for the PDP 6/10, for example.
>
> Sounds right. F4/40 generated machine code but it was pretty poor, and
> I could easily believe it was macro expanded from a stack pseudomachine.
>
> The code from Fortran G was also pretty poor, largely because it
> didn't know anything about the 360's addressing so it was constantly
> loading pointers from a literal pool to reference local scalars rather
> than keeping a pointer to the base of the scalars in a register and
> using the usual base+displacement.
>
> I saw the note about Fortran G generating better code than Fortran H,
> and find it hard to believe unless it was for some rather peculiar
> code.
>
ISTR that H had problems initially ('67 or so). I recall being warned not
to use it. I would hope that the problems got fixed.
--
Pete
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