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authorUlrich Drepper <drepper@redhat.com>2005-12-14 15:06:39 +0000
committerUlrich Drepper <drepper@redhat.com>2005-12-14 15:06:39 +0000
commit9d13fb2413921c713f83efe331e8e4d219c62c6b (patch)
tree2d44d7ac45ab2d147eb8361bbff880c365aa8ad5 /math/s_cexp.c
parentb6ab06cef4670e02756bcdd4d2c33a49369a4346 (diff)
downloadglibc-9d13fb2413921c713f83efe331e8e4d219c62c6b.tar.gz
Moved to csu/errno-loc.c.
Diffstat (limited to 'math/s_cexp.c')
-rw-r--r--math/s_cexp.c127
1 files changed, 127 insertions, 0 deletions
diff --git a/math/s_cexp.c b/math/s_cexp.c
new file mode 100644
index 0000000000..5a299b7687
--- /dev/null
+++ b/math/s_cexp.c
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+/* Return value of complex exponential function for double complex value.
+ 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
+__cexp (__complex__ double x)
+{
+ __complex__ double retval;
+ int rcls = fpclassify (__real__ x);
+ int icls = fpclassify (__imag__ x);
+
+ if (rcls >= FP_ZERO)
+ {
+ /* Real part is finite. */
+ if (icls >= FP_ZERO)
+ {
+ /* Imaginary part is finite. */
+ double exp_val = __ieee754_exp (__real__ x);
+ double sinix, cosix;
+
+ __sincos (__imag__ x, &sinix, &cosix);
+
+ if (isfinite (exp_val))
+ {
+ __real__ retval = exp_val * cosix;
+ __imag__ retval = exp_val * sinix;
+ }
+ else
+ {
+ __real__ retval = __copysign (exp_val, cosix);
+ __imag__ retval = __copysign (exp_val, sinix);
+ }
+ }
+ else
+ {
+ /* If the imaginary part is +-inf or NaN and the real part
+ is not +-inf the result is NaN + iNaN. */
+ __real__ retval = __nan ("");
+ __imag__ retval = __nan ("");
+
+#ifdef FE_INVALID
+ feraiseexcept (FE_INVALID);
+#endif
+ }
+ }
+ else if (rcls == FP_INFINITE)
+ {
+ /* Real part is infinite. */
+ if (icls >= FP_ZERO)
+ {
+ /* Imaginary part is finite. */
+ double value = signbit (__real__ x) ? 0.0 : HUGE_VAL;
+
+ if (icls == FP_ZERO)
+ {
+ /* Imaginary part is 0.0. */
+ __real__ retval = value;
+ __imag__ retval = __imag__ x;
+ }
+ else
+ {
+ double sinix, cosix;
+
+ __sincos (__imag__ x, &sinix, &cosix);
+
+ __real__ retval = __copysign (value, cosix);
+ __imag__ retval = __copysign (value, sinix);
+ }
+ }
+ else if (signbit (__real__ x) == 0)
+ {
+ __real__ retval = HUGE_VAL;
+ __imag__ retval = __nan ("");
+
+#ifdef FE_INVALID
+ if (icls == FP_INFINITE)
+ feraiseexcept (FE_INVALID);
+#endif
+ }
+ else
+ {
+ __real__ retval = 0.0;
+ __imag__ retval = __copysign (0.0, __imag__ x);
+ }
+ }
+ else
+ {
+ /* If the real part is NaN the result is NaN + iNaN. */
+ __real__ retval = __nan ("");
+ __imag__ retval = __nan ("");
+
+#ifdef FE_INVALID
+ if (rcls != FP_NAN || icls != FP_NAN)
+ feraiseexcept (FE_INVALID);
+#endif
+ }
+
+ return retval;
+}
+weak_alias (__cexp, cexp)
+#ifdef NO_LONG_DOUBLE
+strong_alias (__cexp, __cexpl)
+weak_alias (__cexp, cexpl)
+#endif