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  Topic: Difference between release and checkmate?
LitusSaxonicum

Replies: 15
Views: 457

PostForum: General   Posted: Thu Nov 15, 2018 10:13 pm   Subject:
Mecej4,

Isn't it true that the precision is lost when transferring a value from the 8087 register to a location in RAM, especially if the latter is a 32-bit REAL*4 entity? (and less, but still some ...
  Topic: Use of clearwin 32 vs 64 bit
LitusSaxonicum

Replies: 14
Views: 382

PostForum: Support   Posted: Wed Nov 14, 2018 2:52 pm   Subject:
As Paul said in other words, it is a major job to go through anybody else’s code and debug it. What you seem to be doing is plotting something and then expecting the user to press a particular key whi ...
  Topic: Array expressions mishandled when /opt is used
LitusSaxonicum

Replies: 14
Views: 431

PostForum: 64-bit   Posted: Tue Nov 13, 2018 12:08 pm   Subject:
The reason why it might make the code slower is that when you put a subexpression result in a named variable, that variable has to be assigned its value, then retrieved each time, rather than the comp ...
  Topic: No E format in Clearwin
LitusSaxonicum

Replies: 39
Views: 5284

PostForum: Suggestions   Posted: Mon Nov 12, 2018 4:10 pm   Subject:
John,

Then I suggest trying the old version with disk I/O on a machine with the new generation of M2 MVMe SSDs. You could get some idea of the benefit simply by using a SATA SSD for the temporary f ...
  Topic: Use of clearwin 32 vs 64 bit
LitusSaxonicum

Replies: 14
Views: 382

PostForum: Support   Posted: Mon Nov 12, 2018 11:36 am   Subject:
Does your code assume the old VGA colour model? The move to RGB became standard several releases ago.

Eddie
  Topic: No E format in Clearwin
LitusSaxonicum

Replies: 39
Views: 5284

PostForum: Suggestions   Posted: Sat Nov 10, 2018 2:51 pm   Subject:
(In the last year I have been cleaning out a lot of disk to memory based solvers and replacing then with memory to cache solvers. Interesting the similarity in now treating memory as we considered the ...
  Topic: UNION issue? Compiler issue?
LitusSaxonicum

Replies: 5
Views: 151

PostForum: General   Posted: Sat Nov 10, 2018 11:54 am   Subject:
UNIONs, eh?

https://www.youtube.com/watch?v=69O8xmIeenU

Eddie
  Topic: Array expressions mishandled when /opt is used
LitusSaxonicum

Replies: 14
Views: 431

PostForum: 64-bit   Posted: Thu Nov 08, 2018 5:51 pm   Subject:
Mecej4,

I think it may well be the case that common subexpression removal by an efficient and working optimization is probably better than doing it yourself, but surely, for readability it depends ...
  Topic: Array expressions mishandled when /opt is used
LitusSaxonicum

Replies: 14
Views: 431

PostForum: 64-bit   Posted: Thu Nov 08, 2018 3:21 pm   Subject:
I agree with Mecej4 - it would be interesting to see what optimisations are performed, and which might simply be skipped.

It's a long time since I even attempted to use /OPT, as my codes run adequa ...
  Topic: Faulty code generated with /opt /64
LitusSaxonicum

Replies: 8
Views: 249

PostForum: 64-bit   Posted: Thu Nov 08, 2018 12:37 pm   Subject:
Paul,

Surely the point is that an optimisation should produce (a) a change in execution speed, and at worst (b) changed roundoff, not wrong code. Those who use optimisation features in a compiler s ...
  Topic: %tl tab locations
LitusSaxonicum

Replies: 2
Views: 295

PostForum: ClearWin+   Posted: Sat Oct 13, 2018 12:35 pm   Subject:
Possibly because 15 is the same as 15?

(They are not 15 and 15+15)

Eddie
  Topic: What is intrinsic function/subroutine RR ?
LitusSaxonicum

Replies: 10
Views: 420

PostForum: Support   Posted: Fri Oct 12, 2018 5:16 pm   Subject:
Ah! DBOS. That was when FTNxx was the speed demon, knocking just about everything else into the dust! Fond memories.
  Topic: What is intrinsic function/subroutine RR ?
LitusSaxonicum

Replies: 10
Views: 420

PostForum: Support   Posted: Fri Oct 12, 2018 2:17 pm   Subject:
Robert, That makes you part of the Military-Industrial Complex. And it's a big chunk of the Fortran 77 syntax I didn't even know existed, and hence have never used!
Eddie
  Topic: What is intrinsic function/subroutine RR ?
LitusSaxonicum

Replies: 10
Views: 420

PostForum: Support   Posted: Fri Oct 12, 2018 10:49 am   Subject:
Possibly MIL-STD-1753, see here: http://www.fortran.com/mil_std_1753.html

Eddie
  Topic: What is intrinsic function/subroutine RR ?
LitusSaxonicum

Replies: 10
Views: 420

PostForum: Support   Posted: Thu Oct 11, 2018 11:23 am   Subject:
Hi Mecej4,

I have a copy of the 2 volume manual for FTN77/386 (Revision D). The routine RR is described on page 10-10 in volume 1, along with LS, RS, LR, (RR), SHFT, LT, RT. Section 10.8 describes ...
 
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