diff options
Diffstat (limited to 'math/s_ctanh.c')
| -rw-r--r-- | math/s_ctanh.c | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/math/s_ctanh.c b/math/s_ctanh.c index 1347d07834..2d18875c70 100644 --- a/math/s_ctanh.c +++ b/math/s_ctanh.c @@ -1,5 +1,5 @@ /* Complex hyperbole tangent for double. - Copyright (C) 1997-2015 Free Software Foundation, Inc. + Copyright (C) 1997-2016 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. @@ -30,10 +30,17 @@ __ctanh (__complex__ double x) if (__glibc_unlikely (!isfinite (__real__ x) || !isfinite (__imag__ x))) { - if (__isinf_ns (__real__ x)) + if (isinf (__real__ x)) { __real__ res = __copysign (1.0, __real__ x); - __imag__ res = __copysign (0.0, __imag__ x); + if (isfinite (__imag__ x) && fabs (__imag__ x) > 1.0) + { + double sinix, cosix; + __sincos (__imag__ x, &sinix, &cosix); + __imag__ res = __copysign (0.0, sinix * cosix); + } + else + __imag__ res = __copysign (0.0, __imag__ x); } else if (__imag__ x == 0.0) { @@ -44,7 +51,7 @@ __ctanh (__complex__ double x) __real__ res = __nan (""); __imag__ res = __nan (""); - if (__isinf_ns (__imag__ x)) + if (isinf (__imag__ x)) feraiseexcept (FE_INVALID); } } @@ -110,6 +117,7 @@ __ctanh (__complex__ double x) __real__ res = sinhrx * coshrx / den; __imag__ res = sinix * cosix / den; } + math_check_force_underflow_complex (res); } return res; |