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2005-10-20 Jeff Johnston <jjohnstn@redhat.com>

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* libc/include/math.h (HUGE_VAL, HUGE_VALF, HUGE_VALL): When
        gcc is 3.3 or greater, use special gcc builtins.
This commit is contained in:
Jeff Johnston
2005-10-20 21:42:33 +00:00
parent 34da20b26f
commit 09968b6d27
2 changed files with 51 additions and 22 deletions
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5
newlib/ChangeLog
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@@ -1,3 +1,8 @@
2005-10-20 Jeff Johnston <jjohnstn@redhat.com>
* libc/include/math.h (HUGE_VAL, HUGE_VALF, HUGE_VALL): When
gcc is 3.3 or greater, use special gcc builtins.
2005-10-20 Corinna Vinschen <corinna@vinschen.de>
* libc/include/sys/time.h: Declare futimes and lutimes for Cygwin.

62
newlib/libc/include/math.h
View File

@@ -9,10 +9,11 @@
_BEGIN_STD_C
#ifndef HUGE_VAL
/* Define HUGE_VAL as infinity, unless HUGE_VAL is already defined
(which might have been done by something like math-68881.h). */
union __dmath
{
__ULong i[2];
double d;
};
union __fmath
{
@@ -20,30 +21,53 @@ union __fmath
float f;
};
union __dmath
{
__ULong i[2];
double d;
};
union __ldmath
{
__ULong i[4];
_LONG_DOUBLE ld;
};
/* Declare this as an array without bounds so that no matter what small data
support a port and/or library has, this reference will be via the general
method for accessing globals. */
#if defined(__GNUC__) && \
( (__GNUC__ >= 4) || \
( (__GNUC__ >= 3) && defined(__GNUC_MINOR__) && (__GNUC_MINOR__ >= 3) ) )
/* gcc >= 3.3 implicitly defines builtins for HUGE_VALx values. */
#ifndef HUGE_VAL
#define HUGE_VAL (__builtin_huge_val())
#endif
#ifndef HUGE_VALF
#define HUGE_VALF (__builtin_huge_valf())
#endif
#ifndef HUGE_VALL
#define HUGE_VALL (__builtin_huge_vall())
#endif
#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. */
#ifndef HUGE_VAL
extern __IMPORT const union __dmath __infinity[];
extern __IMPORT const union __fmath __infinityf[];
extern __IMPORT const union __ldmath __infinityld[];
#define HUGE_VAL (__infinity[0].d)
#define HUGE_VALF (__infinityf[0].f)
#define HUGE_VALL (__infinityld[0].ld)
#endif
#endif /* ! defined (HUGE_VAL) */
#ifndef HUGE_VALF
extern __IMPORT const union __fmath __infinityf[];
#define HUGE_VALF (__infinityf[0].f)
#endif
#ifndef HUGE_VALL
extern __IMPORT const union __ldmath __infinityld[];
#define HUGE_VALL (__infinityld[0].ld)
#endif
#endif /* !gcc >= 3.3 */
/* Reentrant ANSI C functions. */