From 46db37289f917e23877a0e0df88cbb150805bc97 Mon Sep 17 00:00:00 2001 From: Rich Felker Date: Wed, 20 Nov 2013 17:40:33 -0500 Subject: write floating point limit constants to 21 significant decimal places 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. --- include/math.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'include/math.h') diff --git a/include/math.h b/include/math.h index dc176012..3c2105ef 100644 --- a/include/math.h +++ b/include/math.h @@ -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); -- cgit v1.2.1