Re^2: Loop Not Entered (integer.pm)

Thanks a lot, that was it. integer does not propagate to the debugger's scope. Also, some of our machines have different sizes of integers, so the same code works differently on different machines.

use integer;
$off = 201310170300350000000;
print $off if $off > 0;
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Re^3: Loop Not Entered (integer.pm--) by tye (Sage) on Oct 30, 2013 at 19:52 UTC
Note that I strongly discourage the use of integer.pm. The first paragraph of the documentation contains this whopper: "but on those without floating point hardware, it can make a big difference in performance". Good luck finding a computer without floating point acceleration that is still running. But even if you do, the slow down from doing floating point calculations is quite unlikely to be noticeable much less "a big difference" when talking about a Perl script. Even worse is the other whopper from the first paragraph: "On many machines, this doesn't matter a great deal for most computations". Actually, it very often matters a lot for lots of computations not just because it prevents fractional values from being preserved but also because it very often greatly reduces the size of integer values that can be used. int, however, allows faithful and accurate use of integer arithmetic to at least 52 bits on just about every platform I've seen Perl run on. Just use that instead. - tye	[reply]

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Re^3: Loop Not Entered (integer.pm--)
by tye (Sage) on Oct 30, 2013 at 19:52 UTC

Note that I strongly discourage the use of integer.pm. The first paragraph of the documentation contains this whopper: "but on those without floating point hardware, it can make a big difference in performance". Good luck finding a computer without floating point acceleration that is still running. But even if you do, the slow down from doing floating point calculations is quite unlikely to be noticeable much less "a big difference" when talking about a Perl script.

Even worse is the other whopper from the first paragraph: "On many machines, this doesn't matter a great deal for most computations". Actually, it very often matters a lot for lots of computations not just because it prevents fractional values from being preserved but also because it very often greatly reduces the size of integer values that can be used.

int, however, allows faithful and accurate use of integer arithmetic to at least 52 bits on just about every platform I've seen Perl run on. Just use that instead.

- tye

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