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write floating point limit constants to 21 significant decimal places

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this is enough to produce the correct value even if the constant is
interpreted as 80-bit extended precision, which matters on archs with
excess precision (FLT_EVAL_METHOD==2) under at least some
interpretations of the C standard. the shorter representations, while
correct if converted to the nominal precision at translation time,
could produce an incorrect value at extended precision, yielding
results such as (double)DBL_MAX != DBL_MAX.
This commit is contained in:
Rich Felker
2013-11-20 17:40:33 -05:00
parent d8e8f1464c
commit 46db37289f
2 changed files with 10 additions and 10 deletions
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4
include/math.h
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@ -349,7 +349,7 @@ long double truncl(long double);
#if defined(_XOPEN_SOURCE) || defined(_BSD_SOURCE)
#undef MAXFLOAT
#define MAXFLOAT 3.40282347e+38F
#define MAXFLOAT 3.40282346638528859812e+38F
#endif
#if defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
@ -379,7 +379,7 @@ double yn(int, double);
#endif
#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
#define HUGE 3.40282347e+38F
#define HUGE 3.40282346638528859812e+38F
double scalb(double, double);
float scalbf(float, float);