newlib/libm/machine/amdgcn/v64df_asinh.c

   1 /*
   2  * Copyright 2023 Siemens
   3  *
   4  * The authors hereby grant permission to use, copy, modify, distribute,
   5  * and license this software and its documentation for any purpose, provided
   6  * that existing copyright notices are retained in all copies and that this
   7  * notice is included verbatim in any distributions.  No written agreement,
   8  * license, or royalty fee is required for any of the authorized uses.
   9  * Modifications to this software may be copyrighted by their authors
  10  * and need not follow the licensing terms described here, provided that
  11  * the new terms are clearly indicated on the first page of each file where
  12  * they apply.
  13  */
  14
  15 /*
  16  * ====================================================
  17  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
  18  *
  19  * Developed at SunPro, a Sun Microsystems, Inc. business.
  20  * Permission to use, copy, modify, and distribute this
  21  * software is freely granted, provided that this notice
  22  * is preserved.
  23  * ====================================================
  24  */
  25
  26 /* Based on newlib/libm/mathfp/s_asinh.c in Newlib.  */
  27
  28 #include "amdgcnmach.h"
  29
  30 v64df v64df_log_aux (v64df, v64di);
  31 v64df v64df_log1p_aux (v64df, v64di);
  32 v64df v64df_sqrt_aux (v64df, v64di);
  33
  34 #if defined (__has_builtin) && __has_builtin (__builtin_gcn_fabsv)
  35
  36 DEF_VD_MATH_FUNC (v64df, asinh, v64df x)
  37 {
  38   static const double one =  1.00000000000000000000e+00; /* 0x3FF00000, 0x00000000 */
  39   static const double ln2 =  6.93147180559945286227e-01; /* 0x3FE62E42, 0xFEFA39EF */
  40   static const double huge = 1.00000000000000000000e+300;
  41
  42   FUNCTION_INIT (v64df);
  43
  44   v64df w;
  45   v64si hx;
  46   GET_HIGH_WORD (hx, x, NO_COND);
  47   v64si ix = hx & 0x7fffffff;
  48
  49   VECTOR_IF (ix >=0x7ff00000, cond)     /* x is inf or NaN */
  50     VECTOR_RETURN (x + x, cond);
  51   VECTOR_ENDIF
  52   VECTOR_IF (ix < 0x3e300000, cond)     /* |x|<2**-28 */
  53     VECTOR_IF2 (__builtin_convertvector(huge+x > one, v64si), cond2, cond) /* return x inexact except 0 */
  54       VECTOR_RETURN (x, cond);
  55     VECTOR_ENDIF
  56   VECTOR_ENDIF
  57   VECTOR_IF (ix > 0x41b00000, cond)     /* x > 2**28 */
  58     VECTOR_COND_MOVE (w, v64df_log_aux (__builtin_gcn_fabsv (x), __mask) + ln2,
  59                       cond);
  60   VECTOR_ELSEIF (ix > 0x40000000, cond) /* 2**28 > |x| > 2.0 */
  61     v64df t = __builtin_gcn_fabsv (x);
  62     VECTOR_COND_MOVE (w, v64df_log_aux (2.0 * t + one / (v64df_sqrt_aux (x*x + one, __mask) + t), __mask),
  63                       cond);
  64   VECTOR_ELSE (cond)                    /* 2.0 > |x| > 2**-28 */
  65     v64df t = x * x;
  66     VECTOR_COND_MOVE (w, v64df_log1p_aux (__builtin_gcn_fabsv (x) + t / (one + v64df_sqrt_aux (one + t, __mask)), __mask),
  67                       cond);
  68   VECTOR_ENDIF
  69
  70   VECTOR_IF (hx > 0, cond)
  71     VECTOR_RETURN (w, cond);
  72   VECTOR_ELSE (cond)
  73     VECTOR_RETURN (-w, cond);
  74   VECTOR_ENDIF
  75
  76   FUNCTION_RETURN;
  77 }
  78
  79 DEF_VARIANTS (asinh, df, df)
  80
  81 #endif