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Mention floating rounding issues

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* doc/lispref/numbers.texi (Float Basics): Mention floating-point
rounding issues uncovered by the discussion in Bug#42417.
This commit is contained in:
Paul Eggert 2020-07-09 08:40:17 -07:00
parent c892ae65b4
commit 1f52771fd3
1 changed files with 3 additions and 0 deletions
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doc/lispref/numbers.texi
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@ -227,6 +227,9 @@ you are using. On all computers supported by Emacs, this is
and is discussed further in David Goldberg's paper
``@url{https://docs.oracle.com/cd/E19957-01/806-3568/ncg_goldberg.html,
What Every Computer Scientist Should Know About Floating-Point Arithmetic}''.
On modern platforms, floating-point operations follow the IEEE-754
standard closely; however, results are not always rounded correctly on
some obsolescent platforms, notably 32-bit x86.
The read syntax for floating-point numbers requires either a decimal
point, an exponent, or both. Optional signs (@samp{+} or @samp{-})