diff options
Diffstat (limited to 'sysdeps/ieee754/ldbl-96/s_ilogbl.c')
| -rw-r--r-- | sysdeps/ieee754/ldbl-96/s_ilogbl.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/sysdeps/ieee754/ldbl-96/s_ilogbl.c b/sysdeps/ieee754/ldbl-96/s_ilogbl.c index d44229dcda..9688f5af8f 100644 --- a/sysdeps/ieee754/ldbl-96/s_ilogbl.c +++ b/sysdeps/ieee754/ldbl-96/s_ilogbl.c @@ -20,10 +20,12 @@ static char rcsid[] = "$NetBSD: $"; /* ilogbl(long double x) * return the binary exponent of non-zero x - * ilogbl(0) = 0x80000001 - * ilogbl(inf/NaN) = 0x7fffffff (no signal is raised) + * ilogbl(0) = FP_ILOGB0 + * ilogbl(NaN) = FP_ILOGBNAN (no signal is raised) + * ilogbl(+-Inf) = INT_MAX (no signal is raised) */ +#include <limits.h> #include "math.h" #include "math_private.h" @@ -51,6 +53,9 @@ static char rcsid[] = "$NetBSD: $"; return ix; } else if (es<0x7fff) return es-0x3fff; - else return FP_ILOGBNAN; + else if (FP_ILOGBNAN != INT_MAX && (hx|lx) == 0) + /* ISO C99 requires ilogbl(+-Inf) == INT_MAX. */ + return INT_MAX; + return FP_ILOGBNAN; } weak_alias (__ilogbl, ilogbl) |