[Info-vax] Fortran

[Arne Vajhøj]

On 12/5/2018 4:01 PM, Scott Dorsey wrote:
> Bob Koehler <koehler at eisner.nospam.decuserve.org> wrote:
>> In article <3ce8252e-5eec-45c9-8dbf-d311cc8e27cd at googlegroups.com>, Galen <gltackett at gmail.com> writes:
>>> Probably a GE die-hards still using the three-branch IF as well? ;-)
>>
>>    I know of 300,000 lines of Fortran that was written in the 1960s and
>>    is full of both assigned GOTOs and calculated GOTOs.  Some may have
>>    been re-written in C by now, but not all, last I heard.  It's in
>>    daily use.
> 
> Calculated GOTO is the number one way to slow your program execution down
> to a crawl.  Time for a code review.

Why would it be that slow?

It seems to fit nicely with a VAX CASEL instruction.

But even without it then it would just be calculating an
index into the address array and jump to that.

Or am I missing something critical?

Arne