diff options
Diffstat (limited to 'math/s_ccoshf.c')
| -rw-r--r-- | math/s_ccoshf.c | 43 |
1 files changed, 36 insertions, 7 deletions
diff --git a/math/s_ccoshf.c b/math/s_ccoshf.c index a5a12c1..d6f8110 100644 --- a/math/s_ccoshf.c +++ b/math/s_ccoshf.c @@ -1,5 +1,5 @@ /* Complex cosine hyperbole function for float. - Copyright (C) 1997, 2011 Free Software Foundation, Inc. + Copyright (C) 1997-2012 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. @@ -20,9 +20,8 @@ #include <complex.h> #include <fenv.h> #include <math.h> - #include <math_private.h> - +#include <float.h> __complex__ float __ccoshf (__complex__ float x) @@ -37,14 +36,44 @@ __ccoshf (__complex__ float x) if (__builtin_expect (icls >= FP_ZERO, 1)) { /* Imaginary part is finite. */ - float sinh_val = __ieee754_sinhf (__real__ x); - float cosh_val = __ieee754_coshf (__real__ x); + const int t = (int) ((FLT_MAX_EXP - 1) * M_LN2); float sinix, cosix; __sincosf (__imag__ x, &sinix, &cosix); - __real__ retval = cosh_val * cosix; - __imag__ retval = sinh_val * sinix; + if (fabsf (__real__ x) > t) + { + float exp_t = __ieee754_expf (t); + float rx = fabsf (__real__ x); + if (signbit (__real__ x)) + sinix = -sinix; + rx -= t; + sinix *= exp_t / 2.0f; + cosix *= exp_t / 2.0f; + if (rx > t) + { + rx -= t; + sinix *= exp_t; + cosix *= exp_t; + } + if (rx > t) + { + /* Overflow (original real part of x > 3t). */ + __real__ retval = FLT_MAX * cosix; + __imag__ retval = FLT_MAX * sinix; + } + else + { + float exp_val = __ieee754_expf (rx); + __real__ retval = exp_val * cosix; + __imag__ retval = exp_val * sinix; + } + } + else + { + __real__ retval = __ieee754_coshf (__real__ x) * cosix; + __imag__ retval = __ieee754_sinhf (__real__ x) * sinix; + } } else { |