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John-Silver
Joined: 30 Jul 2013 Posts: 1520 Location: Aerospace Valley
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Posted: Sat May 02, 2015 3:31 am Post subject: |
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Quote: | It is also interesting that it has taken 20 years for this bug to be identified
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not really surprising though as probably no one has tried to use a
"(/(j,j=1,n)/)" type statement within a WHERE , which is pretty rare I would guess.
After all the code has been generated by a machine (albeit a man-made one ) not a youmanbeing, machines are not infallible .. .hence, err , humans are not infa-.... now I'm getting myself in a mess
WHERE (answer=.incorrect).
machine.ne.you_man
endwhere
EXCEPT IF ! <------- (does this exist ???)
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I wonder how old the 'translator' is (not that its relevant to the fact the code won't run, just wrt the 20-year comment because if it didn't exist say 5 years ago then the surprise factor reduces, as I wouldn't think a you-man would even attempt to put where'S INTO IT, AS HAS BEEN 'PROVEN' BY THE OPINIONS ON THIS POST :=) |
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PaulLaidler Site Admin
Joined: 21 Feb 2005 Posts: 7925 Location: Salford, UK
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Posted: Wed Jun 01, 2016 8:05 am Post subject: |
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This has now been fixed for the next release.
Note that the two arrays "ae1u > a(2,a01u)" and "(/(j,j=1,n)/)" are constant with respect to the WHERE construct so it would be better to store them before the beginning of the associated WHERE. As it is they are, they are recalculated each time around. Also there are can memory issues when the compiler adjusts the stack for the temporary arrays (depending on the size of the array and the number of times through the loop).
I guess that an optimising compiler could move these "constant" arrays out of the loop but that would be a fairly tall order. |
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