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authorJakub Jelinek <jakub@redhat.com>2007-07-12 18:26:36 +0000
committerJakub Jelinek <jakub@redhat.com>2007-07-12 18:26:36 +0000
commit0ecb606cb6cf65de1d9fc8a919bceb4be476c602 (patch)
tree2ea1f8305970753e4a657acb2ccc15ca3eec8e2c /math/s_csin.c
parent7d58530341304d403a6626d7f7a1913165fe2f32 (diff)
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2.5-18.1
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-rw-r--r--math/s_csin.c131
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diff --git a/math/s_csin.c b/math/s_csin.c
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+/* Complex sine function for double.
+ Copyright (C) 1997 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, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#include <complex.h>
+#include <fenv.h>
+#include <math.h>
+
+#include "math_private.h"
+
+
+__complex__ double
+__csin (__complex__ double x)
+{
+ __complex__ double retval;
+ int negate = signbit (__real__ x);
+ int rcls = fpclassify (__real__ x);
+ int icls = fpclassify (__imag__ x);
+
+ __real__ x = fabs (__real__ x);
+
+ if (icls >= FP_ZERO)
+ {
+ /* Imaginary part is finite. */
+ if (rcls >= FP_ZERO)
+ {
+ /* Real part is finite. */
+ double sinh_val = __ieee754_sinh (__imag__ x);
+ double cosh_val = __ieee754_cosh (__imag__ x);
+ double sinix, cosix;
+
+ __sincos (__real__ x, &sinix, &cosix);
+
+ __real__ retval = cosh_val * sinix;
+ __imag__ retval = sinh_val * cosix;
+
+ if (negate)
+ __real__ retval = -__real__ retval;
+ }
+ else
+ {
+ if (icls == FP_ZERO)
+ {
+ /* Imaginary part is 0.0. */
+ __real__ retval = __nan ("");
+ __imag__ retval = __imag__ x;
+
+#ifdef FE_INVALID
+ if (rcls == FP_INFINITE)
+ feraiseexcept (FE_INVALID);
+#endif
+ }
+ else
+ {
+ __real__ retval = __nan ("");
+ __imag__ retval = __nan ("");
+
+#ifdef FE_INVALID
+ feraiseexcept (FE_INVALID);
+#endif
+ }
+ }
+ }
+ else if (icls == FP_INFINITE)
+ {
+ /* Imaginary part is infinite. */
+ if (rcls == FP_ZERO)
+ {
+ /* Real part is 0.0. */
+ __real__ retval = __copysign (0.0, negate ? -1.0 : 1.0);
+ __imag__ retval = __imag__ x;
+ }
+ else if (rcls > FP_ZERO)
+ {
+ /* Real part is finite. */
+ double sinix, cosix;
+
+ __sincos (__real__ x, &sinix, &cosix);
+
+ __real__ retval = __copysign (HUGE_VAL, sinix);
+ __imag__ retval = __copysign (HUGE_VAL, cosix);
+
+ if (negate)
+ __real__ retval = -__real__ retval;
+ if (signbit (__imag__ x))
+ __imag__ retval = -__imag__ retval;
+ }
+ else
+ {
+ /* The addition raises the invalid exception. */
+ __real__ retval = __nan ("");
+ __imag__ retval = HUGE_VAL;
+
+#ifdef FE_INVALID
+ if (rcls == FP_INFINITE)
+ feraiseexcept (FE_INVALID);
+#endif
+ }
+ }
+ else
+ {
+ if (rcls == FP_ZERO)
+ __real__ retval = __copysign (0.0, negate ? -1.0 : 1.0);
+ else
+ __real__ retval = __nan ("");
+ __imag__ retval = __nan ("");
+ }
+
+ return retval;
+}
+weak_alias (__csin, csin)
+#ifdef NO_LONG_DOUBLE
+strong_alias (__csin, __csinl)
+weak_alias (__csin, csinl)
+#endif