Commit 1f52771f authored by Paul Eggert's avatar Paul Eggert

Mention floating rounding issues

* doc/lispref/numbers.texi (Float Basics): Mention floating-point
rounding issues uncovered by the discussion in Bug#42417.
parent c892ae65
Pipeline #6014 failed with stage
in 11 seconds
......@@ -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{-})
......
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