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Fix ccos, csin, ccosh, csinh overflows (bug 14123).

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This commit is contained in:
Joseph Myers
2012-05-19 15:35:29 +00:00
parent f66f0ce833
commit e0b16cc25c
14 changed files with 801 additions and 64 deletions
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43
math/s_csin.c
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@ -1,5 +1,5 @@
/* Complex sine function for 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__ double
__csin (__complex__ double x)
@ -40,14 +39,44 @@ __csin (__complex__ double x)
if (__builtin_expect (rcls >= FP_ZERO, 1))
{
/* Real part is finite. */
double sinh_val = __ieee754_sinh (__imag__ x);
double cosh_val = __ieee754_cosh (__imag__ x);
const int t = (int) ((DBL_MAX_EXP - 1) * M_LN2);
double sinix, cosix;
__sincos (__real__ x, &sinix, &cosix);
__real__ retval = cosh_val * sinix;
__imag__ retval = sinh_val * cosix;
if (fabs (__imag__ x) > t)
{
double exp_t = __ieee754_exp (t);
double ix = fabs (__imag__ x);
if (signbit (__imag__ x))
cosix = -cosix;
ix -= t;
sinix *= exp_t / 2.0;
cosix *= exp_t / 2.0;
if (ix > t)
{
ix -= t;
sinix *= exp_t;
cosix *= exp_t;
}
if (ix > t)
{
/* Overflow (original imaginary part of x > 3t). */
__real__ retval = DBL_MAX * sinix;
__imag__ retval = DBL_MAX * cosix;
}
else
{
double exp_val = __ieee754_exp (ix);
__real__ retval = exp_val * sinix;
__imag__ retval = exp_val * cosix;
}
}
else
{
__real__ retval = __ieee754_cosh (__imag__ x) * sinix;
__imag__ retval = __ieee754_sinh (__imag__ x) * cosix;
}
if (negate)
__real__ retval = -__real__ retval;