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authorUlrich Drepper <drepper@redhat.com>1999-07-14 00:54:57 +0000
committerUlrich Drepper <drepper@redhat.com>1999-07-14 00:54:57 +0000
commitabfbdde177c3a7155070dda1b2cdc8292054cc26 (patch)
treee021306b596381fbf8311d2b7eb294e918ff17c8 /sysdeps/generic/s_cexp.c
parent86421aa57ecfd70963ae66848bd6a6dd3b8e0fe6 (diff)
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Update.
Diffstat (limited to 'sysdeps/generic/s_cexp.c')
-rw-r--r--sysdeps/generic/s_cexp.c127
1 files changed, 127 insertions, 0 deletions
diff --git a/sysdeps/generic/s_cexp.c b/sysdeps/generic/s_cexp.c
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+++ b/sysdeps/generic/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 Library General Public License as
+ published by the Free Software Foundation; either version 2 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
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. 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