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Article #621782Re: Who Wrote Fortran IV, Level G?
From: David Wade
Date: Wed, 11 Apr 2018 09:39
Date: Wed, 11 Apr 2018 09:39
29 lines
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2844 bytes
On 11/04/2018 05:30, John Levine wrote:
> In article <1613292015.545100577.072...@news.eternal-september.org> you write:
>> John Levine <jo...@taugh.com> wrote:
>>> 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.
>
> I was using Fortran H on production code in about 1973 on Princeton's
> 360/91 and it worked fine. It was a large (for the time) numerical
> economic simulation that took forever to run. Recompiling with H
> rather than G and rewriting a couple of subroutines so they didn't
> open and close a file every time they read a record from the disk made
> a huge difference.
>
>
>
From what I know the preserved versions of Fortran H that are around
still contain bugs. There is some reference here:-
https://books.google.co.uk/books?id=aBxVAAAAMAAJ&lpg=PA5&ots=cpnQJFjS0k&dq=ibm%20%22fortran%20h%22%20bugs&pg=PA5
(sorry for the long url)
perhaps they were not fixed until IBM made the compiler a program product.
Dave
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