newlib/libm/machine/amdgcn/v64sf_modf.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/common/sf_modf.c in Newlib.  */
  27
  28 #include "amdgcnmach.h"
  29
  30 v64si v64sf_numtestf (v64sf);
  31
  32 DEF_VS_MATH_FUNC (v64sf, modff, v64sf x, v64sf *iptr)
  33 {
  34   FUNCTION_INIT (v64sf);
  35   v64sf ret_i;
  36
  37   v64si i0;
  38   GET_FLOAT_WORD (i0, x, NO_COND);
  39   v64si j0 = ((i0 >> 23) & 0xff) - 0x7f;        /* exponent of x */
  40   v64sf zero;
  41   SET_FLOAT_WORD (zero, i0 & 0x80000000,NO_COND);
  42
  43   VECTOR_IF (j0 < 23, cond)                     /* integer part in x*/
  44     VECTOR_IF2 (j0 < 0, cond2, cond)            /* |x|<1 */
  45       VECTOR_COND_MOVE (ret_i, zero, cond2);
  46       VECTOR_RETURN (x, cond2);
  47     VECTOR_ELSE2 (cond2, cond)
  48       v64si i = (0x007fffff) >> j0;
  49
  50       VECTOR_IF2 ((i0 & i) == 0, cond3, cond2)  /* x is integral */
  51         VECTOR_COND_MOVE (ret_i, x, cond3);
  52         VECTOR_RETURN (zero, cond3);
  53       VECTOR_ELSE2 (cond3, cond2)
  54         SET_FLOAT_WORD (ret_i, i0 & ~i, cond3);
  55         VECTOR_RETURN (x - ret_i, cond3);
  56       VECTOR_ENDIF
  57     VECTOR_ENDIF
  58   VECTOR_ELSE (cond)                            /* no fraction part */
  59     VECTOR_COND_MOVE (ret_i, x, cond);
  60     VECTOR_IF2 (v64sf_numtestf (x) == NAN, cond2, cond)
  61       VECTOR_COND_MOVE (ret_i, x + x, cond2);
  62       VECTOR_RETURN (ret_i, cond2);             /* x is NaN, return NaN */
  63     VECTOR_ENDIF
  64     VECTOR_RETURN (zero, cond);                 /* return +- 0 */
  65   VECTOR_ENDIF
  66
  67   *iptr = ret_i;
  68   FUNCTION_RETURN;
  69 }