ppc float.h

[Marcel Moolenaar]

On Nov 12, 2008, at 11:50 AM, Andreas Tobler wrote:

> Hello,
>
> can somebody explain why we have these defines in sys/powerpc/ 
> include/float.h ?
>
> #define LDBL_MANT_DIG	DBL_MANT_DIG
> #define LDBL_EPSILON	DBL_EPSILON
> #define LDBL_DIG	DBL_DIG
> #define LDBL_MIN_EXP	DBL_MIN_EXP
> #define LDBL_MIN	DBL_MIN
> #define LDBL_MIN_10_EXP	DBL_MIN_10_EXP
> #define LDBL_MAX_EXP	DBL_MAX_EXP
> #define LDBL_MAX	DBL_MAX
> #define LDBL_MAX_10_EXP	DBL_MAX_10_EXP

Because "long double" on PowerPC is the same as "double".
This is dictated by the compiler:

mini-g4% gcc -E -dM -xc /dev/null | grep DBL | grep DIG
#define __DBL_DIG__ 15
#define __LDBL_DIG__ 15
#define __LDBL_MANT_DIG__ 53
#define __DBL_MANT_DIG__ 53

-- 
Marcel Moolenaar
xcllnt at mac.com