Simplify, document, and port floating-point.

[bpt/emacs.git] / src / ChangeLog

diff --git a/src/ChangeLog b/src/ChangeLog
index 4eda17d..0e5bbfd 100644 (file)
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,5 +1,26 @@
 2012-09-11  Paul Eggert  <eggert@cs.ucla.edu>
 
+       Simplify, document, and port floating-point (Bug#12381).
+       The porting part of this patch fixes bugs on non-IEEE platforms
+       with frexp, ldexp, logb.
+       * data.c, lisp.h (Qdomain_error, Qsingularity_error, Qunderflow_error):
+       Now static.
+       * floatfns.c: Simplify discussion of functions that Emacs doesn't
+       support, by removing commented-out code and briefly listing the
+       C89 functions excluded.  The commented-out stuff was confusing
+       maintenance, e.g., we thought we needed cbrt but it was commented out.
+       (logb): Remove decl; no longer needed.
+       (isfinite): New macro, if not already supplied.
+       (isnan): Don't replace any existing macro.
+       (Ffrexp, Fldexp): Define even if !HAVE_COPYSIGN, as frexp and ldexp
+       are present on all C89 platforms.
+       (Ffrexp): Do not special-case zero, as frexp does the right thing
+       for that case.
+       (Flogb): Do not use logb, as it doesn't have the desired meaning
+       on hosts that use non-base-2 floating point.  Instead, stick with
+       frexp, which is C89 anyway.  Do not pass an infinity or a NaN to
+       frexp, to avoid getting an unspecified result.
+
        * xdisp.c (Qinhibit_debug_on_message): Now static.
 
 2012-09-10  Jan Djärv  <jan.h.d@swipnet.se>