1 files changed, 84 insertions, 0 deletions
diff --git a/lib/libm/src/s_ccosf.c b/lib/libm/src/s_ccosf.c
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+++ b/lib/libm/src/s_ccosf.c
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+/*	$OpenBSD: s_ccosf.c,v 1.1 2008/09/07 20:36:09 martynas Exp $	*/
+/*
+ * Copyright (c) 2008 Stephen L. Moshier <steve@moshier.net>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/*							ccosf()
+ *
+ *	Complex circular cosine
+ *
+ *
+ *
+ * SYNOPSIS:
+ *
+ * void ccosf();
+ * cmplxf z, w;
+ *
+ * ccosf( &z, &w );
+ *
+ *
+ *
+ * DESCRIPTION:
+ *
+ * If
+ *     z = x + iy,
+ *
+ * then
+ *
+ *     w = cos x  cosh y  -  i sin x sinh y.
+ *
+ *
+ *
+ * ACCURACY:
+ *
+ *                      Relative error:
+ * arithmetic   domain     # trials      peak         rms
+ *    IEEE      -10,+10     30000       1.8e-7       5.5e-8
+ */
+
+#include <complex.h>
+#include <math.h>
+
+/* calculate cosh and sinh */
+
+static void
+_cchshf(float xx, float *c, float *s)
+{
+	float x, e, ei;
+
+	x = xx;
+	if(fabsf(x) <= 0.5f) {
+		*c = coshf(x);
+		*s = sinhf(x);
+	}
+	else {
+		e = expf(x);
+		ei = 0.5f/e;
+		e = 0.5f * e;
+		*s = e - ei;
+		*c = e + ei;
+	}
+}
+
+float complex
+ccosf(float complex z)
+{
+	float complex w;
+	float ch, sh;
+
+	_cchshf( cimag(z), &ch, &sh );
+	w = cosf( creal(z) ) * ch + ( -sinf( creal(z) ) * sh) * I;
+	return (w);
+}