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Double.java: More Classpath merging

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* java/lang/Double.java: More Classpath merging
	(isInfinite): Don't use doubleToLongBits
	(isNaN (Object)): return v != v
	(initIDs): make native
	* java/lang/Float.java: Ditto
	(isInfinite): Don't use floatToIntBits
	(isNaN (Object)): return v != v
	* java/lang/natDouble.cc: add empty initIDs()

From-SVN: r46370
This commit is contained in:
Mark Wielaard 2001-10-20 06:26:45 +00:00 • committed by Mark Wielaard
parent afb649d5c9
commit f0fdd66ba4
4 changed files with 42 additions and 19 deletions
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21
libjava/java/lang/Float.java
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@ -215,6 +215,14 @@ public final class Float extends Number implements Comparable
* <code>instanceof</code> <code>Float</code>, and represents
* the same primitive <code>float</code> value return
* <code>true</code>. Otherwise <code>false</code> is returned.
* <p>
* Note that there are two differences between <code>==</code> and
* <code>equals()</code>. <code>0.0f == -0.0f</code> returns <code>true</code>
* but <code>new Float(0.0f).equals(new Float(-0.0f))</code> returns
* <code>false</code>. And <code>Float.NaN == Float.NaN</code> returns
* <code>false</code>, but
* <code>new Float(Float.NaN).equals(new Float(Float.NaN))</code> returns
* <code>true</code>.
*
* @param obj the object to compare to
* @return whether the objects are semantically equal.
@ -364,11 +372,9 @@ public final class Float extends Number implements Comparable
*/
public static boolean isNaN (float v)
{
int bits = floatToIntBits (v);
int e = bits & 0x7f800000;
int f = bits & 0x007fffff;
return e == 0x7f800000 && f != 0;
// This works since NaN != NaN is the only reflexive inequality
// comparison which returns true.
return v != v;
}
/**
@ -393,10 +399,7 @@ public final class Float extends Number implements Comparable
*/
public static boolean isInfinite (float v)
{
int bits = floatToIntBits (v);
int f = bits & 0x7fffffff;
return f == 0x7f800000;
return (v == POSITIVE_INFINITY || v == NEGATIVE_INFINITY);
}
/**