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| author | Paul Eggert <eggert@cs.ucla.edu> | 2020-07-09 08:40:17 -0700 |
|---|---|---|
| committer | Paul Eggert <eggert@cs.ucla.edu> | 2020-07-09 08:40:58 -0700 |
| commit | 1f52771fd3ec79937626e7a3a71ad4427d07e31c (patch) | |
| tree | 95643872dba72f88f83c8478e0e537ec2a54b749 /doc | |
| parent | c892ae65b431f76054a7a8677ca064e298578340 (diff) | |
| download | emacs-1f52771fd3ec79937626e7a3a71ad4427d07e31c.tar.gz | |
Mention floating rounding issues
* doc/lispref/numbers.texi (Float Basics): Mention floating-point
rounding issues uncovered by the discussion in Bug#42417.
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/lispref/numbers.texi | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/doc/lispref/numbers.texi b/doc/lispref/numbers.texi index 4002b36ce50..f018ef4c7c0 100644 --- a/doc/lispref/numbers.texi +++ b/doc/lispref/numbers.texi @@ -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{-}) |