Simplify, document, and port floating-point.

The porting part of this patch fixes bugs on non-IEEE platforms
with frexp, ldexp, logb.
* admin/CPP-DEFINES (HAVE_CBRT, HAVE_LOGB, logb): Remove.
* configure.ac (logb, cbrt): Do not check for these functions,
as they are not being used.
* doc/lispref/numbers.texi (Float Basics, Arithmetic Operations, Math Functions):
Document that / and mod (with floating point arguments), along
with asin, acos, log, log10, expt and sqrt, return special values
instead of signaling exceptions.
(Float Basics): Document that logb operates on the absolute value
of its argument.
(Math Functions): Document that (log ARG BASE) also returns NaN if
BASE is negative.  Document that (expt X Y) returns NaN if X is a
finite negative number and Y a finite non-integer.
* etc/NEWS: Document NaNs versus signaling-error change.
* src/data.c, src/lisp.h (Qdomain_error, Qsingularity_error, Qunderflow_error):
Now static.
* src/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.

1 files changed, 21 insertions, 0 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index 4eda17da3a7..0e5bbfd2524 100644
--- 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>