diff options
| author | Paul Eggert <[email protected]> | 2012-09-10 19:28:27 -0700 |
|---|---|---|
| committer | Paul Eggert <[email protected]> | 2012-09-10 19:28:27 -0700 |
| commit | c990426a9883c1bd1782e6b117184b654eecda67 (patch) | |
| tree | 43083f890e5286637ee754482af0f92d6d2236d0 /admin | |
| parent | 6fda35f2b3e3ce3c7dcc05f230f60c51c4c42e60 (diff) | |
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.
Diffstat (limited to 'admin')
| -rw-r--r-- | admin/CPP-DEFINES | 4 | ||||
| -rw-r--r-- | admin/ChangeLog | 5 |
2 files changed, 5 insertions, 4 deletions
diff --git a/admin/CPP-DEFINES b/admin/CPP-DEFINES index b40ba78e20..cf6ffee2c6 100644 --- a/admin/CPP-DEFINES +++ b/admin/CPP-DEFINES @@ -120,7 +120,6 @@ HAVE_ATTRIBUTE_ALIGNED HAVE_BDFFONT HAVE_BOXES HAVE_C99_STRTOLD -HAVE_CBRT HAVE_CFMAKERAW HAVE_CFSETSPEED HAVE_CLOCK_GETTIME @@ -251,7 +250,6 @@ HAVE_LIBXMU HAVE_LINUX_VERSION_H HAVE_LOCALTIME_R HAVE_LOCAL_SOCKETS -HAVE_LOGB HAVE_LONG_FILE_NAMES HAVE_LONG_LONG_INT HAVE_LRAND48 @@ -574,7 +572,6 @@ getpid isatty kill link -logb lseek mkdir mktemp @@ -616,7 +613,6 @@ fopen getpid index isatty -logb lseek mkdir mktemp diff --git a/admin/ChangeLog b/admin/ChangeLog index 2c61f43798..b70067d746 100644 --- a/admin/ChangeLog +++ b/admin/ChangeLog @@ -1,3 +1,8 @@ +2012-09-11 Paul Eggert <[email protected]> + + Simplify, document, and port floating-point (Bug#12381). + * CPP-DEFINES (HAVE_CBRT, HAVE_LOGB, logb): Remove. + 2012-09-09 Paul Eggert <[email protected]> Assume C89 or later for math functions (Bug#12381). |