chromium/v8/third_party/glibc/src/sysdeps/ieee754/dbl-64/branred.c

/*
 * IBM Accurate Mathematical Library
 * Copyright (C) 2001-2022 Free Software Foundation, Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, see <https://www.gnu.org/licenses/>.
 */
/*******************************************************************/
/*                                                                 */
/* MODULE_NAME: branred.c                                          */
/*                                                                 */
/* FUNCTIONS:   branred                                            */
/*                                                                 */
/* FILES NEEDED: branred.h mydefs.h endian.h mpa.h                 */
/*               mha.c                                             */
/*                                                                 */
/* Routine  branred() performs range  reduction of a double number */
/* x into Double length number  a+aa,such that                     */
/* x=n*pi/2+(a+aa), abs(a+aa)<pi/4, n=0,+-1,+-2,....               */
/* Routine returns the integer (n mod 4) of the above description  */
/* of x.                                                           */
/*******************************************************************/

#include "endian.h"
#include "mydefs.h"
#include "branred.h"

#include <math.h>

#ifndef SECTION
#define SECTION
#endif


/*******************************************************************/
/* Routine  branred() performs range  reduction of a double number */
/* x into Double length number a+aa,such that                      */
/* x=n*pi/2+(a+aa), abs(a+aa)<pi/4, n=0,+-1,+-2,....               */
/* Routine return integer (n mod 4)                                */
/*******************************************************************/
int
SECTION
__branred(double x, double *a, double *aa)
{ … }