diff options
Diffstat (limited to 'sysdeps/ieee754/dbl-64/e_log2.c')
| -rw-r--r-- | sysdeps/ieee754/dbl-64/e_log2.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/sysdeps/ieee754/dbl-64/e_log2.c b/sysdeps/ieee754/dbl-64/e_log2.c index 997d7cefc8..bc6a34192a 100644 --- a/sysdeps/ieee754/dbl-64/e_log2.c +++ b/sysdeps/ieee754/dbl-64/e_log2.c @@ -56,6 +56,7 @@ #include <math.h> #include <math_private.h> +#include <fix-int-fp-convert-zero.h> static const double ln2 = 0.69314718055994530942; static const double two54 = 1.80143985094819840000e+16; /* 43500000 00000000 */ @@ -101,7 +102,11 @@ __ieee754_log2 (double x) if ((0x000fffff & (2 + hx)) < 3) { /* |f| < 2**-20 */ if (f == zero) - return dk; + { + if (FIX_INT_FP_CONVERT_ZERO && dk == 0.0) + dk = 0.0; + return dk; + } R = f * f * (0.5 - 0.33333333333333333 * f); return dk - (R - f) / ln2; } |