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emacs-27 1f52771: Mention floating rounding issues

From: Paul Eggert
Subject: emacs-27 1f52771: Mention floating rounding issues
Date: Thu, 9 Jul 2020 11:41:04 -0400 (EDT)

branch: emacs-27
commit 1f52771fd3ec79937626e7a3a71ad4427d07e31c
Author: Paul Eggert <eggert@cs.ucla.edu>
Commit: Paul Eggert <eggert@cs.ucla.edu>

    Mention floating rounding issues
    * doc/lispref/numbers.texi (Float Basics): Mention floating-point
    rounding issues uncovered by the discussion in Bug#42417.
 doc/lispref/numbers.texi | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/doc/lispref/numbers.texi b/doc/lispref/numbers.texi
index 4002b36..f018ef4 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
 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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