mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-25 22:40:05 +00:00
01dbacd22a
According to C99/C11 Annex G, cacos applied to a value with real part +Inf and finite imaginary part should produce a result with real part +0. glibc wrongly produces a result with real part -0 in FE_DOWNWARD mode. This patch fixes this by checking for zero results in the relevant case of non-finite arguments (where there should never be a result with -0 real part), and converts the tests of cacos to ALL_RM_TEST. Tested x86_64 and x86 and ulps updated accordingly. [BZ #16928] * math/s_cacos.c (__cacos): Ensure zero real part of result from non-finite arguments is +0. * math/s_cacosf.c (__cacosf): Likewise. * math/s_cacosl.c (__cacosl): Likewise. * math/libm-test.inc (cacos_test): Use ALL_RM_TEST. * sysdeps/i386/fpu/libm-test-ulps: Update. * sysdeps/x86_64/fpu/libm-test-ulps: Likewise.
59 lines
1.7 KiB
C
59 lines
1.7 KiB
C
/* Return cosine of complex double value.
|
|
Copyright (C) 1997-2014 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <complex.h>
|
|
#include <math.h>
|
|
|
|
__complex__ double
|
|
__cacos (__complex__ double x)
|
|
{
|
|
__complex__ double y;
|
|
__complex__ double res;
|
|
int rcls = fpclassify (__real__ x);
|
|
int icls = fpclassify (__imag__ x);
|
|
|
|
if (rcls <= FP_INFINITE || icls <= FP_INFINITE
|
|
|| (rcls == FP_ZERO && icls == FP_ZERO))
|
|
{
|
|
y = __casin (x);
|
|
|
|
__real__ res = (double) M_PI_2 - __real__ y;
|
|
if (__real__ res == 0.0)
|
|
__real__ res = 0.0;
|
|
__imag__ res = -__imag__ y;
|
|
}
|
|
else
|
|
{
|
|
__real__ y = -__imag__ x;
|
|
__imag__ y = __real__ x;
|
|
|
|
y = __kernel_casinh (y, 1);
|
|
|
|
__real__ res = __imag__ y;
|
|
__imag__ res = __real__ y;
|
|
}
|
|
|
|
return res;
|
|
}
|
|
weak_alias (__cacos, cacos)
|
|
#ifdef NO_LONG_DOUBLE
|
|
strong_alias (__cacos, __cacosl)
|
|
weak_alias (__cacos, cacosl)
|
|
#endif
|