gcc/libjava/java/lang/natMath.cc
Tom Tromey ee9dd3721b Initial revision
From-SVN: r26263
1999-04-07 14:42:40 +00:00

264 lines
6.0 KiB
C++

/* 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 <java-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);
}