shankar@hpclscu.HP.COM (Shankar Unni) (09/09/88)
I need some info on IEEE floating point representation limits to construct
a <float.h> file for ANSI C. I already have the info for single and double
floats:
#define FLT_RADIX 2
#define FLT_ROUNDS 1 /* sort of: *.5 rounds -> nearest EVEN */
#define FLT_MANT_DIG 24
#define FLT_EPSILON 1.19209290E-07
#define FLT_DIG 6
#define FLT_MIN_EXP -126
#define FLT_MIN 1.17549435E-38
#define FLT_MIN_10_EXP -37
#define FLT_MAX_EXP 127
#define FLT_MAX 3.40282347E+38
#define FLT_MAX_10_EXP 38
#define DBL_MANT_DIG 53
#define DBL_EPSILON 2.2204460492503131E-16
#define DBL_DIG 15
#define DBL_MIN_EXP -1022
#define DBL_MIN 2.225073858507201E-308
#define DBL_MIN_10_EXP -307
#define DBL_MAX_EXP 1023
#define DBL_MAX 1.797693134862315e+308
#define DBL_MAX_10_EXP 308
The information I need is (for quad-precision (128-bit) floats):
#define LDBL_MANT_DIG 113
#define LDBL_EPSILON ?? /* 1.0 + EPSILON != 1.0 */
#define LDBL_DIG ?? /* decimal digits of precision */
#define LDBL_MIN_EXP -16382
#define LDBL_MIN ?? /* smallest *normalized* quad */
#define LDBL_MIN_10_EXP ?? /* about -4930, no? */
#define LDBL_MAX_EXP 16383
#define LDBL_MAX ?? /* largest quad */
#define LDBL_MAX_10_EXP ?? /* ~~ 4931? */
The magnitude of the smallest de-normalized quad would also be useful...
Could some kind soul *VERIFY* the above figures that I've filled in, and
fill in those that I haven't?
--
Many many thanx in advance,
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Shankar Unni allegra)
Mail: shankar@hpda.HP.COM UUCP: ucbvax)!hplabs!hpda!shankar
AT&T: (408) 447-5797 decwrl)
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