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2009-05-15 Craig Howland <howland@LGSInnovations.com>

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* configure.in:  Add configuration test for long double type existing
        and set flag _HAVE_LONG_DOUBLE if true.  Fix INIT_ARRAY (.init_array)
        and _LDBL_EQ_DBL tests to not link so that will work with
        cross-compilers.
        * configure: Regenerated.
        * Makefile.in: Ditto.
        * newlib.hin: Add _HAVE_LONG_DOUBLE flag.
        * libc/include/math.h:  Change non-builtin defines for HUGE_VAL,
        HUGE_VALF, and HUGE_VALL to be constant expressions.  Add definitions
        for the non-builtin case for INFINITY and NAN.  Gate HUGE_VALL and
        union __ldmath definitions with (new) _HAVE_LONG_DOUBLE.
        *libm/common/s_infconst.c:  Change definitions to use values from
        float.h instead of non-so-portable integer forms.  Mark as being
        deprecated (because now removed from math.h, are not used anywhere
        in Newlib, itself).
This commit is contained in:
Jeff Johnston
2009-05-15 16:15:57 +00:00
parent 7aa710a782
commit de8a5b7810
7 changed files with 179 additions and 55 deletions
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54
newlib/libc/include/math.h
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@ -8,23 +8,28 @@
_BEGIN_STD_C
/* __dmath, __fmath, and __ldmath are only here for backwards compatibility
* in case any code used them. They are no longer used by Newlib, itself,
* other than legacy. */
union __dmath
{
__ULong i[2];
double d;
__ULong i[2];
};
union __fmath
{
__ULong i[1];
float f;
__ULong i[1];
};
#if defined(_HAVE_LONG_DOUBLE)
union __ldmath
{
long double ld;
__ULong i[4];
_LONG_DOUBLE ld;
};
#endif
/* Natural log of 2 */
#define _M_LOG2_E 0.693147180559945309417
@ -57,24 +62,45 @@ union __ldmath
#else /* !gcc >= 3.3 */
/* No builtins. Use floating-point unions instead. Declare as an array
without bounds so no matter what small data support a port and/or
library has, the reference will be via the general method for accessing
globals. */
/* No builtins. Use fixed defines instead. (All 3 HUGE plus the INFINITY
* and NAN macros are required to be constant expressions. Using a variable--
* even a static const--does not meet this requirement, as it cannot be
* evaluated at translation time.)
* The infinities are done using numbers that are far in excess of
* something that would be expected to be encountered in a floating-point
* implementation. (A more certain way uses values from float.h, but that is
* avoided because system includes are not supposed to include each other.)
* This method might produce warnings from some compilers. (It does in
* newer GCCs, but not for ones that would hit this #else.) If this happens,
* please report details to the Newlib mailing list. */
#ifndef HUGE_VAL
extern __IMPORT const union __dmath __infinity[];
#define HUGE_VAL (__infinity[0].d)
#define HUGE_VAL (1.0e999999999)
#endif
#ifndef HUGE_VALF
extern __IMPORT const union __fmath __infinityf[];
#define HUGE_VALF (__infinityf[0].f)
#define HUGE_VALF (1.0e999999999F)
#endif
#ifndef HUGE_VALL
extern __IMPORT const union __ldmath __infinityld[];
#define HUGE_VALL (__infinityld[0].ld)
#if !defined(HUGE_VALL) && defined(_HAVE_LONG_DOUBLE)
#define HUGE_VALL (1.0e999999999L)
#endif
#if !defined(INFINITY)
#define INFINITY (HUGE_VALF)
#endif
#if !defined(NAN)
#if defined(__GNUC__) && defined(__cplusplus)
/* Exception: older g++ versions warn about the divide by 0 used in the
* normal case (even though older gccs do not). This trick suppresses the
* warning, but causes errors for plain gcc, so is only used in the one
* special case. */
static const union { __ULong __i[1]; float __d; } __Nanf = {0x7FC00000};
#define NAN (__Nanf.__d)
#else
#define NAN (0.0F/0.0F)
#endif
#endif
#endif /* !gcc >= 3.3 */