compiler/stdc/math/s_cacos.c

   1 /*      $OpenBSD: s_cacos.c,v 1.6 2013/07/03 04:46:36 espie Exp $       */
   2 /*
   3  * Copyright (c) 2008 Stephen L. Moshier <steve@moshier.net>
   4  *
   5  * Permission to use, copy, modify, and distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 /*                                                      cacos()
  19  *
  20  *      Complex circular arc cosine
  21  *
  22  *
  23  *
  24  * SYNOPSIS:
  25  *
  26  * double complex cacos();
  27  * double complex z, w;
  28  *
  29  * w = cacos (z);
  30  *
  31  *
  32  *
  33  * DESCRIPTION:
  34  *
  35  *
  36  * w = arccos z  =  PI/2 - arcsin z.
  37  *
  38  *
  39  *
  40  *
  41  * ACCURACY:
  42  *
  43  *                      Relative error:
  44  * arithmetic   domain     # trials      peak         rms
  45  *    DEC       -10,+10      5200      1.6e-15      2.8e-16
  46  *    IEEE      -10,+10     30000      1.8e-14      2.2e-15
  47  */
  48
  49 #include <float.h>
  50 #include <complex.h>
  51 #include "math.h"
  52
  53 double complex
  54 cacos(double complex z)
  55 {
  56         double complex w;
  57
  58         w = casin (z);
  59         w = (M_PI_2 - creal (w)) - cimag (w) * I;
  60         return (w);
  61 }
  62
  63 #if     LDBL_MANT_DIG == DBL_MANT_DIG
  64 AROS_MAKE_ASM_SYM(typeof(cacosl), cacosl, AROS_CSYM_FROM_ASM_NAME(cacosl), AROS_CSYM_FROM_ASM_NAME(cacos));
  65 AROS_EXPORT_ASM_SYM(AROS_CSYM_FROM_ASM_NAME(cacosl));
  66 #endif  /* LDBL_MANT_DIG == DBL_MANT_DIG */