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| author | Joseph Myers <joseph@codesourcery.com> | 2012-05-19 15:35:29 +0000 |
|---|---|---|
| committer | Joseph Myers <joseph@codesourcery.com> | 2012-05-19 15:35:29 +0000 |
| commit | e0b16cc25c4bae1ac45ec6ce90341f9a7d1ae6b6 (patch) | |
| tree | 82c8f2f5c13fba98b2b028475bf84d9cd15bd6b8 /math/s_ccoshl.c | |
| parent | f66f0ce833523a47e12b4a3eacab6b20866ab033 (diff) | |
| download | glibc-e0b16cc25c4bae1ac45ec6ce90341f9a7d1ae6b6.tar.gz glibc-e0b16cc25c4bae1ac45ec6ce90341f9a7d1ae6b6.tar.xz glibc-e0b16cc25c4bae1ac45ec6ce90341f9a7d1ae6b6.zip | |
Fix ccos, csin, ccosh, csinh overflows (bug 14123).
Diffstat (limited to 'math/s_ccoshl.c')
| -rw-r--r-- | math/s_ccoshl.c | 43 |
1 files changed, 36 insertions, 7 deletions
diff --git a/math/s_ccoshl.c b/math/s_ccoshl.c index 32fdd8cf81..77a9ae3869 100644 --- a/math/s_ccoshl.c +++ b/math/s_ccoshl.c @@ -1,5 +1,5 @@ /* Complex cosine hyperbole function for long double. - 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__ long double __ccoshl (__complex__ long double x) @@ -37,14 +36,44 @@ __ccoshl (__complex__ long double x) if (__builtin_expect (icls >= FP_ZERO, 1)) { /* Imaginary part is finite. */ - long double sinh_val = __ieee754_sinhl (__real__ x); - long double cosh_val = __ieee754_coshl (__real__ x); + const int t = (int) ((LDBL_MAX_EXP - 1) * M_LN2l); long double sinix, cosix; __sincosl (__imag__ x, &sinix, &cosix); - __real__ retval = cosh_val * cosix; - __imag__ retval = sinh_val * sinix; + if (fabsl (__real__ x) > t) + { + long double exp_t = __ieee754_expl (t); + long double rx = fabsl (__real__ x); + if (signbit (__real__ x)) + sinix = -sinix; + rx -= t; + sinix *= exp_t / 2.0L; + cosix *= exp_t / 2.0L; + if (rx > t) + { + rx -= t; + sinix *= exp_t; + cosix *= exp_t; + } + if (rx > t) + { + /* Overflow (original real part of x > 3t). */ + __real__ retval = LDBL_MAX * cosix; + __imag__ retval = LDBL_MAX * sinix; + } + else + { + long double exp_val = __ieee754_expl (rx); + __real__ retval = exp_val * cosix; + __imag__ retval = exp_val * sinix; + } + } + else + { + __real__ retval = __ieee754_coshl (__real__ x) * cosix; + __imag__ retval = __ieee754_sinhl (__real__ x) * sinix; + } } else { |