------- Additional Comments From jsm28 at gcc dot gnu dot org 2005-03-22 20:52
-------
The following definitions should replace the Solaris ones outright for GCC.
This has been reported to Sun, so fixes for these should be disabled for
any future header mentioning __GNUC__.
#define HUGE_VAL (__builtin_huge_val())
#define HUGE_VALF (__builtin_huge_valf())
#define HUGE_VALL (__builtin_huge_vall())
#define INFINITY (__builtin_inff())
#define NAN (__builtin_nanf(""))
#define isgreater(x, y) __builtin_isgreater(x, y)
#define isgreaterequal(x, y) __builtin_isgreaterequal(x, y)
#define isless(x, y) __builtin_isless(x, y)
#define islessequal(x, y) __builtin_islessequal(x, y)
#define islessgreater(x, y) __builtin_islessgreater(x, y)
#define isunordered(u, v) __builtin_isunordered(u, v)
__builtin_isinf and __builtin_signbit are not currently entirely suited
to the uses to which they are being put. For __builtin_isinf this is bug 20558.
For __builtin_signbit, it ought to be type-generic but avoid falling back to
the wrong function or a function the library does not have. (The Solaris
libc doesn't seem to have isinf or signbit library functions.) GCC does
not yet have __builtin_isfinite or __builtin_isnormal functions; they would
be generically useful additions if they always avoided falling back to
a library function. __builtin_fpclassify would also be useful but would
only be usable where GCC is configured to know the FP_* values used on
a given target.
In principle all the macros can be defined along the lines of
the isnan/isfinite/isinf definitions in libgcc2.c, with GNU extensions to
avoid multiple evaluation, but this is not very efficient.
--
What |Removed |Added
----------------------------------------------------------------------------
CC| |ro at techfak dot uni-
| |bielefeld dot de, jsm28 at
| |gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19933
