lib/trigl.h

   1 /* Declarations for sinl, cosl, tanl internal functions.  -*- coding: utf-8 -*-
   2    Contributed by Paolo Bonzini
   3
   4    Copyright 2002-2003, 2009-2024 Free Software Foundation, Inc.
   5
   6    This file is part of gnulib.
   7
   8    This file is free software: you can redistribute it and/or modify
   9    it under the terms of the GNU Lesser General Public License as
  10    published by the Free Software Foundation, either version 3 of the
  11    License, or (at your option) any later version.
  12
  13    This file is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU Lesser General Public License for more details.
  17
  18    You should have received a copy of the GNU Lesser General Public License
  19    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  20
  21 /* Decompose x into x = k * π/2 + r
  22    where k is an integer and abs(r) <= π/4.
  23    Store r in y[0] and y[1] (main part in y[0], small additional part in
  24    y[1], r = y[0] + y[1]).
  25    Return k.  */
  26 extern int ieee754_rem_pio2l (long double x, long double *y);
  27
  28 /* Compute and return sinl (x + y), where x is the main part and y is the
  29    small additional part of a floating-point number.
  30    iy is 0 when y is known to be 0.0, otherwise iy is 1.  */
  31 extern long double kernel_sinl (long double x, long double y, int iy);
  32
  33 /* Compute and return cosl (x + y), where x is the main part and y is the
  34    small additional part of a floating-point number.  */
  35 extern long double kernel_cosl (long double x, long double y);