aboutsummaryrefslogtreecommitdiff
path: root/sysdeps/generic/s_csinf.c
diff options
context:
space:
mode:
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_csinf.c
parent86421aa57ecfd70963ae66848bd6a6dd3b8e0fe6 (diff)
downloadglibc-abfbdde177c3a7155070dda1b2cdc8292054cc26.tar
glibc-abfbdde177c3a7155070dda1b2cdc8292054cc26.tar.gz
glibc-abfbdde177c3a7155070dda1b2cdc8292054cc26.tar.bz2
glibc-abfbdde177c3a7155070dda1b2cdc8292054cc26.zip
Update.
Diffstat (limited to 'sysdeps/generic/s_csinf.c')
-rw-r--r--sysdeps/generic/s_csinf.c127
1 files changed, 127 insertions, 0 deletions
diff --git a/sysdeps/generic/s_csinf.c b/sysdeps/generic/s_csinf.c
new file mode 100644
index 0000000000..31d2f1fd54
--- /dev/null
+++ b/sysdeps/generic/s_csinf.c
@@ -0,0 +1,127 @@
+/* Complex sine function for float.
+ 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__ float
+__csinf (__complex__ float x)
+{
+ __complex__ float retval;
+ int negate = signbit (__real__ x);
+ int rcls = fpclassify (__real__ x);
+ int icls = fpclassify (__imag__ x);
+
+ __real__ x = fabsf (__real__ x);
+
+ if (icls >= FP_ZERO)
+ {
+ /* Imaginary part is finite. */
+ if (rcls >= FP_ZERO)
+ {
+ /* Real part is finite. */
+ float sinh_val = __ieee754_sinhf (__imag__ x);
+ float cosh_val = __ieee754_coshf (__imag__ x);
+ float sinix, cosix;
+
+ __sincosf (__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 = __nanf ("");
+ __imag__ retval = __imag__ x;
+
+#ifdef FE_INVALID
+ if (rcls == FP_INFINITE)
+ feraiseexcept (FE_INVALID);
+#endif
+ }
+ else
+ {
+ __real__ retval = __nanf ("");
+ __imag__ retval = __nanf ("");
+
+#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 = __copysignf (0.0, negate ? -1.0 : 1.0);
+ __imag__ retval = __imag__ x;
+ }
+ else if (rcls > FP_ZERO)
+ {
+ /* Real part is finite. */
+ float sinix, cosix;
+
+ __sincosf (__real__ x, &sinix, &cosix);
+
+ __real__ retval = __copysignf (HUGE_VALF, sinix);
+ __imag__ retval = __copysignf (HUGE_VALF, cosix);
+
+ if (negate)
+ __real__ retval = -__real__ retval;
+ if (signbit (__imag__ x))
+ __imag__ retval = -__imag__ retval;
+ }
+ else
+ {
+ /* The addition raises the invalid exception. */
+ __real__ retval = __nanf ("");
+ __imag__ retval = HUGE_VALF;
+
+#ifdef FE_INVALID
+ if (rcls == FP_INFINITE)
+ feraiseexcept (FE_INVALID);
+#endif
+ }
+ }
+ else
+ {
+ if (rcls == FP_ZERO)
+ __real__ retval = __copysignf (0.0, negate ? -1.0 : 1.0);
+ else
+ __real__ retval = __nanf ("");
+ __imag__ retval = __nanf ("");
+ }
+
+ return retval;
+}
+weak_alias (__csinf, csinf)