diff options
| author | Joseph Myers <joseph@codesourcery.com> | 2016-12-01 02:56:55 +0000 |
|---|---|---|
| committer | Joseph Myers <joseph@codesourcery.com> | 2016-12-01 02:56:55 +0000 |
| commit | b2491db6c814d614acdef9d7a4e44a8c3b3ae9dc (patch) | |
| tree | 41305c94dd72e70f90ffab6c6c3f632686c0a08e /math/math.h | |
| parent | a1f6a9abbe6406d5a7d84c39d4afc402fd233f85 (diff) | |
| download | glibc-b2491db6c814d614acdef9d7a4e44a8c3b3ae9dc.tar glibc-b2491db6c814d614acdef9d7a4e44a8c3b3ae9dc.tar.gz glibc-b2491db6c814d614acdef9d7a4e44a8c3b3ae9dc.tar.bz2 glibc-b2491db6c814d614acdef9d7a4e44a8c3b3ae9dc.zip | |
Refactor FP_ILOGB* out of bits/mathdef.h.
Continuing the refactoring of bits/mathdef.h, this patch stops it
defining FP_ILOGB0 and FP_ILOGBNAN, moving the required information to
a new header bits/fp-logb.h.
There are only two possible values of each of those macros permitted
by ISO C. TS 18661-1 adds corresponding macros for llogb, and their
values are required to correspond to those of the ilogb macros in the
obvious way. Thus two boolean values - for which the same choices are
correct for most architectures - suffice to determine the value of all
these macros, and by defining macros for those boolean values in
bits/fp-logb.h we can then define the public FP_* macros in math.h and
avoid the present duplication of the associated feature test macro
logic.
This patch duly moves to bits/fp-logb.h defining __FP_LOGB0_IS_MIN and
__FP_LOGBNAN_IS_MIN. Default definitions of those to 0 are correct
for both architectures, while ia64, m68k and x86 get their own
versions of bits/fp-logb.h to reflect their use of values different
from the defaults.
The patch renders many copies of bits/mathdef.h trivial (needed only
to avoid the default __NO_LONG_DOUBLE_MATH). I'll revise
<https://sourceware.org/ml/libc-alpha/2016-11/msg00865.html>
accordingly so that it removes all bits/mathdef.h headers except the
default one and the alpha one, and arranges for the header to be
included only by complex.h as the only remaining use at that point
will be for the alpha ABI issues there.
Tested for x86_64 and x86. Also did compile-only testing with
build-many-glibcs.py (using glibc sources from before the commit that
introduced many build failures with undefined __GI___sigsetjmp).
* bits/fp-logb.h: New file.
* sysdeps/ia64/bits/fp-logb.h: Likewise.
* sysdeps/m68k/m680x0/bits/fp-logb.h: Likewise.
* sysdeps/x86/bits/fp-logb.h: Likewise.
* math/Makefile (headers): Add bits/fp-logb.h.
* math/math.h: Include <bits/fp-logb.h>.
[__USE_ISOC99] (FP_ILOGB0): Define based on __FP_LOGB0_IS_MIN.
[__USE_ISOC99] (FP_ILOGBNAN): Define based on __FP_LOGBNAN_IS_MIN.
* bits/mathdef.h (FP_ILOGB0): Remove.
(FP_ILOGBNAN): Likewise.
* sysdeps/aarch64/bits/mathdef.h (FP_ILOGB0): Likewise.
(FP_ILOGBNAN): Likewise.
* sysdeps/alpha/bits/mathdef.h (FP_ILOGB0): Likewise.
(FP_ILOGBNAN): Likewise.
* sysdeps/ia64/bits/mathdef.h (FP_ILOGB0): Likewise.
(FP_ILOGBNAN): Likewise.
* sysdeps/m68k/m680x0/bits/mathdef.h (FP_ILOGB0): Likewise.
(FP_ILOGBNAN): Likewise.
* sysdeps/mips/bits/mathdef.h (FP_ILOGB0): Likewise.
(FP_ILOGBNAN): Likewise.
* sysdeps/powerpc/bits/mathdef.h (FP_ILOGB0): Likewise.
(FP_ILOGBNAN): Likewise.
* sysdeps/s390/bits/mathdef.h (FP_ILOGB0): Likewise.
(FP_ILOGBNAN): Likewise.
* sysdeps/sparc/bits/mathdef.h (FP_ILOGB0): Likewise.
(FP_ILOGBNAN): Likewise.
* sysdeps/x86/bits/mathdef.h (FP_ILOGB0): Likewise.
(FP_ILOGBNAN): Likewise.
Diffstat (limited to 'math/math.h')
| -rw-r--r-- | math/math.h | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/math/math.h b/math/math.h index 95b39b3d92..6e4bf9e528 100644 --- a/math/math.h +++ b/math/math.h @@ -97,13 +97,30 @@ typedef _Float128x double_t; # endif #endif -/* Define macros for the return value of ilogb. +/* Define macros for the return value of ilogb, based on + __FP_LOGB0_IS_MIN and __FP_LOGBNAN_IS_MIN. FP_ILOGB0 Expands to a value returned by `ilogb (0.0)'. FP_ILOGBNAN Expands to a value returned by `ilogb (NAN)'. */ +#include <bits/fp-logb.h> +#ifdef __USE_ISOC99 +# if __FP_LOGB0_IS_MIN +# define FP_ILOGB0 (-2147483647 - 1) +# else +# define FP_ILOGB0 (-2147483647) +# endif +# if __FP_LOGBNAN_IS_MIN +# define FP_ILOGBNAN (-2147483647 - 1) +# else +# define FP_ILOGBNAN 2147483647 +# endif +#endif + +/* Get information about long double. */ + #include <bits/mathdef.h> /* Get the architecture specific values describing the floating-point |