It will reuse a floating-point literal for another value that's approximately equal

I'll speculate that it will only engage in "reuse" when the two values are exactly equal. (Bear in mind that 2e25 and 20e24 are exactly equal.)
So it should be a valid optimization - it's only being brought undone by the miscalculation of 20e24.

The miscalculation of 20e24 is a bug in perl6 that should be reported, though FAIK it might already have been fixed.

UPDATE: The same miscalculation is also a bug in perl5 - but such miscalculations are already known in perl 5

Cheers,
Rob

In reply to Re^2: Small Perl 6 discoveries III, Ints by syphilis
in thread Small Perl 6 discoveries III, Ints by Anonymous Monk

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.