Thanks, all, for the very useful responses (I'm responding to BrowserUk's reply specifically because it's so detailed and helpful in so many aspects) - this was very useful for both confirmation and more direction in deciding where to look for the error. I'm not all that familiar with the guts of Perl, but it's looking likely that there's a major compilation difference responsible here: either single-precision lookup tables, or perhaps a radically different math lib. Annoying that something like that could affect a Perl program... but on the other hand, good to learn that it can.

Again, thank you all very much.


--
"Language shapes the way we think, and determines what we can think about."
-- B. L. Whorf

In reply to Re^2: Calculation discrepancy between Perl versions by oko1
in thread Calculation discrepancy between Perl versions by oko1

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.