diff options
Diffstat (limited to 'math/s_ctanh.c')
| -rw-r--r-- | math/s_ctanh.c | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/math/s_ctanh.c b/math/s_ctanh.c index 201871e7ec..d288b7d168 100644 --- a/math/s_ctanh.c +++ b/math/s_ctanh.c @@ -83,10 +83,22 @@ __ctanh (__complex__ double x) } else { - double sinhrx = __ieee754_sinh (__real__ x); - double coshrx = __ieee754_cosh (__real__ x); + double sinhrx, coshrx; + if (fabs (__real__ x) > DBL_MIN) + { + sinhrx = __ieee754_sinh (__real__ x); + coshrx = __ieee754_cosh (__real__ x); + } + else + { + sinhrx = __real__ x; + coshrx = 1.0; + } - den = sinhrx * sinhrx + cosix * cosix; + if (fabs (sinhrx) > fabs (cosix) * DBL_EPSILON) + den = sinhrx * sinhrx + cosix * cosix; + else + den = cosix * cosix; __real__ res = sinhrx * coshrx / den; __imag__ res = sinix * cosix / den; } |