/* Copyright (C) 1998, 1999  Cygnus Solutions

   This file is part of libgcj.

This software is copyrighted work licensed under the terms of the
Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
details.  */
 
/**
 * @author Andrew Haley <aph@cygnus.com>
 * @date Tue Sep 22 1998 */
/* Written using "Java Class Libraries", 2nd edition, ISBN 0-201-31002-3
 * "The Java Language Specification", ISBN 0-201-63451-1
 * plus online API docs for JDK 1.2 beta from http://www.javasoft.com.
 * Status:  Believed complete and correct.
 */
 
#include <config.h>

#include <java/lang/String.h>
#include <java/lang/Float.h>
#include <java/lang/Double.h>
#include <java/lang/Integer.h>
#include <java/lang/Long.h>
#include <java/lang/Math.h>
#include <gcj/array.h>

#include "fdlibm.h"

jdouble java::lang::Math::cos(jdouble x)
{
  return (jdouble)::cos((double)x);
}  

jdouble java::lang::Math::sin(jdouble x)
{
  return (jdouble)::sin((double)x);
}  

jdouble java::lang::Math::tan(jdouble x)
{
  return (jdouble)::tan((double)x);
}  

jdouble java::lang::Math::asin(jdouble x)
{
  return (jdouble)::asin((double)x);
}  

jdouble java::lang::Math::acos(jdouble x)
{
  return (jdouble)::acos((double)x);
}  

jdouble java::lang::Math::atan(jdouble x)
{
  return (jdouble)::atan((double)x);
}  

jdouble java::lang::Math::atan2(jdouble y, jdouble x)
{
  return (jdouble)::atan2((jdouble)y, (jdouble)x);
}  

jdouble java::lang::Math::log(jdouble x)
{
  return (jdouble)::log((double)x);
}  

jdouble java::lang::Math::exp(jdouble x)
{
  return (jdouble)::exp((double)x);
}  

jdouble java::lang::Math::sqrt(jdouble x)
{
  return (jdouble)::sqrt((double)x);
}  

jdouble java::lang::Math::pow(jdouble y, jdouble x)
{
  return (jdouble)::pow((jdouble)y, (jdouble)x);
}  

jdouble java::lang::Math::IEEEremainder(jdouble y, jdouble x)
{
  return (jdouble)::__ieee754_remainder((jdouble)y, (jdouble)x);
}  

jdouble java::lang::Math::abs(jdouble x)
{
  return (jdouble)::fabs((double)x);
}  

jfloat java::lang::Math::abs(jfloat x)
{
  return (jfloat)::fabsf((float)x);
}  

jdouble java::lang::Math::rint(jdouble x)
{
  return (jdouble)::rint((double)x);
}  

jint java::lang::Math::round(jfloat x)
{
  if (x != x)
    return 0;
  if (x <= (jfloat)java::lang::Integer::MIN_VALUE)
    return java::lang::Integer::MIN_VALUE;
  if (x >= (jfloat)java::lang::Integer::MAX_VALUE)
    return java::lang::Integer::MAX_VALUE;

  return (jint)::rintf((float)x);
}  

jlong java::lang::Math::round(jdouble x)
{
  if (x != x)
    return 0;
  if (x <= (jdouble)java::lang::Long::MIN_VALUE)
    return java::lang::Long::MIN_VALUE;
  if (x >= (jdouble)java::lang::Long::MAX_VALUE)
    return java::lang::Long::MAX_VALUE;

  return (jlong)::rint((double)x);
}  

jdouble java::lang::Math::floor(jdouble x)
{
  return (jdouble)::floor((double)x);
}  

jdouble java::lang::Math::ceil(jdouble x)
{
  return (jdouble)::ceil((double)x);
}  

static inline int
floatToIntBits (jfloat value)
{
  union {
    jint l;
    jfloat d;
  } u;
  u.d = value;
  return u.l;
}

static inline bool
isNaN (jint bits)
{
  jint e = bits & 0x7f800000;
  jint f = bits & 0x007fffff;

  return e == 0x7f800000 && f != 0;
}

jfloat
java::lang::Math::min(jfloat a, jfloat b)
{
  jint abits = floatToIntBits (a);
  jint bbits = floatToIntBits (b);
  
  if (isNaN (abits) || isNaN (bbits))
    return java::lang::Float::NaN;
  
  if (abits >= 0) // a is +ve
    return bbits < 0 ? b  // a is +ve, b is -ve.
      // a and b are both +ve, so compare magnitudes: the number with
      // the smallest magnitude is the smallest
      : (abits < bbits ? a : b);
  else // a is -ve
    return bbits >= 0 ? a  // a is -ve, b is +ve.
      // a and b are both -ve, so compare magnitudes: the number with
      // the biggest magnitude is the smallest
      : (abits > bbits ? a : b);
}

jfloat 
java::lang::Math::max(jfloat a, jfloat b)
{
  jint abits = floatToIntBits (a);
  jint bbits = floatToIntBits (b);
  
  if (isNaN (abits) || isNaN (bbits))
    return java::lang::Float::NaN;
  
  if (abits >= 0) // a is +ve
    return bbits < 0 ? a  // a is +ve, b is -ve.
      // a and b are both +ve, so compare magnitudes: the number with
      // the smallest magnitude is the smallest
      : (abits > bbits ? a : b);
  else // a is -ve
    return bbits >= 0 ? b  // a is -ve, b is +ve.
      // a and b are both -ve, so compare magnitudes: the number with
      // the biggest magnitude is the smallest
      : (abits < bbits ? a : b);
}

static inline jlong
doubleToLongBits (jdouble value)
{
  union {
    jlong l;
    jdouble d;
  } u;
  u.d = value;
  return u.l;
}

static inline bool 
isNaN (jlong bits)
{
  jlong e = bits & 0x7ff0000000000000LL;
  jlong f = bits & 0x000fffffffffffffLL;
  
  return e == 0x7ff0000000000000LL && f != 0LL;
}


jdouble
java::lang::Math::min(jdouble a, jdouble b)
{
  jlong abits = doubleToLongBits (a);
  jlong bbits = doubleToLongBits (b);
  
  if (isNaN (abits) || isNaN (bbits))
    return java::lang::Double::NaN;

  if (abits >= 0LL) // a is +ve
    return bbits < 0LL ? b  // a is +ve, b is -ve.
      // a and b are both +ve, so compare magnitudes: the number with
      // the smallest magnitude is the smallest
      : (abits < bbits ? a : b);
  else // a is -ve
    return bbits >= 0LL ? a  // a is -ve, b is +ve.
      // a and b are both -ve, so compare magnitudes: the number with
      // the biggest magnitude is the smallest
      : (abits > bbits ? a : b);
}

jdouble
java::lang::Math::max(jdouble a, jdouble b)
{
  jlong abits = doubleToLongBits (a);
  jlong bbits = doubleToLongBits (b);
  
  if (isNaN (abits) || isNaN (bbits))
    return java::lang::Double::NaN;

  if (abits >= 0LL) // a is +ve
    return bbits < 0LL ? a  // a is +ve, b is -ve.
      // a and b are both +ve, so compare magnitudes: the number with
      // the smallest magnitude is the smallest
      : (abits > bbits ? a : b);
  else // a is -ve
    return bbits >= 0LL ? b  // a is -ve, b is +ve.
      // a and b are both -ve, so compare magnitudes: the number with
      // the biggest magnitude is the smallest
      : (abits < bbits ? a : b);
}