While at it, also add missing Java 1.6 java/lang package constants.
Signed-off-by: Pekka Enberg <[email protected]>
---
java/lang/Double.java | 17 ++++++++++-
java/lang/Float.java | 15 +++++++++
java/lang/Math.java | 26 ++++++++++++++++
java/lang/StrictMath.java | 18 +++++++++++
native/fdlibm/Makefile.am | 1 +
native/fdlibm/s_ilogb.c | 47 +++++++++++++++++++++++++++++
native/jni/java-lang/java_lang_VMDouble.c | 8 +++++
native/jni/java-lang/java_lang_VMFloat.c | 10 ++++++
vm/reference/java/lang/VMDouble.java | 2 +
vm/reference/java/lang/VMFloat.java | 2 +
10 files changed, 145 insertions(+), 1 deletions(-)
create mode 100644 native/fdlibm/s_ilogb.c
diff --git a/java/lang/Double.java b/java/lang/Double.java
index 3ae1b01..680d2a2 100644
--- a/java/lang/Double.java
+++ b/java/lang/Double.java
@@ -96,7 +96,22 @@ public final class Double extends Number implements
Comparable<Double>
*/
public static final int SIZE = 64;
- /**
+ /**
+ * @since 1.6
+ */
+ public static final double MIN_NORMAL = 0x1.0p-1022;
+
+ /**
+ * @since 1.6
+ */
+ public static final int MAX_EXPONENT = 1023;
+
+ /**
+ * @since 1.6
+ */
+ public static final int MIN_EXPONENT = -1022;
+
+ /**
* The primitive type <code>double</code> is represented by this
* <code>Class</code> object.
* @since 1.1
diff --git a/java/lang/Float.java b/java/lang/Float.java
index a4a766e..d0e9f1a 100644
--- a/java/lang/Float.java
+++ b/java/lang/Float.java
@@ -104,6 +104,21 @@ public final class Float extends Number implements
Comparable<Float>
public static final int SIZE = 32;
/**
+ * @since 1.6
+ */
+ public static final float MIN_NORMAL = 0x1.0p-126f;
+
+ /**
+ * @since 1.6
+ */
+ public static final int MAX_EXPONENT = 127;
+
+ /**
+ * @since 1.6
+ */
+ public static final int MIN_EXPONENT = -126;
+
+ /**
* Cache representation of 0
*/
private static final Float ZERO = new Float(0.0f);
diff --git a/java/lang/Math.java b/java/lang/Math.java
index 6cf29b4..8dc911c 100644
--- a/java/lang/Math.java
+++ b/java/lang/Math.java
@@ -1049,4 +1049,30 @@ public final class Math
}
return Float.intBitsToFloat((newExponent << mantissaBits) | newMantissa);
}
+
+ /**
+ * @since 1.6
+ */
+ public static int getExponent(float f)
+ {
+ if (Float.isNaN(f) || Float.isInfinite(f))
+ return Float.MAX_EXPONENT + 1;
+ else if (f == 0.0f)
+ return Float.MIN_EXPONENT - 1;
+ else
+ return VMFloat.getExponent(f);
+ }
+
+ /**
+ * @since 1.6
+ */
+ public static int getExponent(double d)
+ {
+ if (Double.isNaN(d) || Double.isInfinite(d))
+ return Double.MAX_EXPONENT + 1;
+ else if (d == 0.0)
+ return Double.MIN_EXPONENT - 1;
+ else
+ return VMDouble.getExponent(d);
+ }
}
diff --git a/java/lang/StrictMath.java b/java/lang/StrictMath.java
index 225aaa7..800d00f 100644
--- a/java/lang/StrictMath.java
+++ b/java/lang/StrictMath.java
@@ -2644,4 +2644,22 @@ public final strictfp class StrictMath
// There's no difference.
return Math.ulp(f);
}
+
+ /**
+ * @since 1.6
+ */
+ public static int getExponent(float f)
+ {
+ // There's no difference.
+ return Math.getExponent(f);
+ }
+
+ /**
+ * @since 1.6
+ */
+ public static int getExponent(double d)
+ {
+ // There's no difference.
+ return Math.getExponent(d);
+ }
}
diff --git a/native/fdlibm/Makefile.am b/native/fdlibm/Makefile.am
index 29bf837..d274fac 100644
--- a/native/fdlibm/Makefile.am
+++ b/native/fdlibm/Makefile.am
@@ -35,6 +35,7 @@ libfdlibm_la_SOURCES = \
sf_fabs.c \
s_finite.c \
s_floor.c \
+ s_ilogb.c \
s_log1p.c \
sf_rint.c \
s_rint.c \
diff --git a/native/fdlibm/s_ilogb.c b/native/fdlibm/s_ilogb.c
new file mode 100644
index 0000000..366f3a7
--- /dev/null
+++ b/native/fdlibm/s_ilogb.c
@@ -0,0 +1,47 @@
+
+/* @(#)s_ilogb.c 1.3 95/01/18 */
+/*
+ * ====================================================
+ * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
+ *
+ * Developed at SunSoft, a Sun Microsystems, Inc. business.
+ * Permission to use, copy, modify, and distribute this
+ * software is freely granted, provided that this notice
+ * is preserved.
+ * ====================================================
+ */
+
+/* ilogb(double x)
+ * return the binary exponent of non-zero x
+ * ilogb(0) = 0x80000001
+ * ilogb(inf/NaN) = 0x7fffffff (no signal is raised)
+ */
+
+#include "fdlibm.h"
+
+#ifdef __STDC__
+ int ilogb(double x)
+#else
+ int ilogb(x)
+ double x;
+#endif
+{
+ int hx,lx,ix;
+
+ GET_HIGH_WORD(hx,x);
+ hx &= 0x7fffffff;
+ if(hx<0x00100000) {
+ GET_LOW_WORD(lx,x);
+ if((hx|lx)==0)
+ return 0x80000001; /* ilogb(0) = 0x80000001 */
+ else /* subnormal x */
+ if(hx==0) {
+ for (ix = -1043; lx>0; lx<<=1) ix -=1;
+ } else {
+ for (ix = -1022,hx<<=11; hx>0; hx<<=1) ix -=1;
+ }
+ return ix;
+ }
+ else if (hx<0x7ff00000) return (hx>>20)-1023;
+ else return 0x7fffffff;
+}
diff --git a/native/jni/java-lang/java_lang_VMDouble.c
b/native/jni/java-lang/java_lang_VMDouble.c
index e915a30..6380c07 100644
--- a/native/jni/java-lang/java_lang_VMDouble.c
+++ b/native/jni/java-lang/java_lang_VMDouble.c
@@ -453,3 +453,11 @@ Java_java_lang_VMDouble_parseDouble
return val;
}
+
+JNIEXPORT jint JNICALL
+Java_java_lang_VMDouble_getExponent
+ (JNIEnv *env __attribute__ ((__unused__)),
+ jclass cls __attribute__ ((__unused__)), jdouble d)
+{
+ return ilogb(d);
+}
diff --git a/native/jni/java-lang/java_lang_VMFloat.c
b/native/jni/java-lang/java_lang_VMFloat.c
index acd07ff..cf6f914 100644
--- a/native/jni/java-lang/java_lang_VMFloat.c
+++ b/native/jni/java-lang/java_lang_VMFloat.c
@@ -40,6 +40,8 @@ exception statement from your version. */
#include "java_lang_VMFloat.h"
+#include "fdlibm.h"
+
/*
* Class: java_lang_VMFloat
* Method: floatToRawIntBits
@@ -69,3 +71,11 @@ Java_java_lang_VMFloat_intBitsToFloat
u.i = bits;
return u.f;
}
+
+JNIEXPORT jint JNICALL
+Java_java_lang_VMFloat_getExponent
+ (JNIEnv *env __attribute__ ((__unused__)),
+ jclass cls __attribute__ ((__unused__)), jfloat f)
+{
+ return ilogb(f);
+}
diff --git a/vm/reference/java/lang/VMDouble.java
b/vm/reference/java/lang/VMDouble.java
index edfa723..6992f44 100644
--- a/vm/reference/java/lang/VMDouble.java
+++ b/vm/reference/java/lang/VMDouble.java
@@ -119,4 +119,6 @@ final class VMDouble
* @throws NullPointerException if str is null
*/
static native double parseDouble(String str);
+
+ static native int getExponent(double d);
}
diff --git a/vm/reference/java/lang/VMFloat.java
b/vm/reference/java/lang/VMFloat.java
index e6e784f..03843ed 100644
--- a/vm/reference/java/lang/VMFloat.java
+++ b/vm/reference/java/lang/VMFloat.java
@@ -117,4 +117,6 @@ final class VMFloat
// the infinitely precise decimal.
return (float) Double.parseDouble(str);
}
+
+ static native int getExponent(float f);
} // class VMFloat
--
1.7.4.1
