8055852: Add test/java/lang/Math/DoubleConsts.java and FloatConsts.java
Reviewed-by: mchung, darcy
Contributed-by: amy.lu@oracle.com
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/java/lang/Math/DoubleConsts.java Fri Aug 22 18:54:20 2014 -0700
@@ -0,0 +1,74 @@
+/*
+ * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code 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 General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/**
+ * Common library for additional constants of the {@code double} type.
+ */
+public final class DoubleConsts {
+ /**
+ * Don't let anyone instantiate this class.
+ */
+ private DoubleConsts() {}
+
+ /**
+ * Bias used in representing a {@code double} exponent.
+ */
+ public static final int EXP_BIAS = 1023;
+
+ /**
+ * Bit mask to isolate the exponent field of a {@code double}.
+ */
+ public static final long EXP_BIT_MASK = 0x7FF0000000000000L;
+
+ /**
+ * Bit mask to isolate the sign bit of a {@code double}.
+ */
+ public static final long SIGN_BIT_MASK = 0x8000000000000000L;
+
+ /**
+ * Bit mask to isolate the significand field of a {@code double}.
+ */
+ public static final long SIGNIF_BIT_MASK = 0x000FFFFFFFFFFFFFL;
+
+ /**
+ * The number of logical bits in the significand of a
+ * {@code double} number, including the implicit bit.
+ */
+ public static final int SIGNIFICAND_WIDTH = 53;
+
+ /**
+ * The exponent the smallest positive {@code double}
+ * subnormal value would have if it could be normalized.
+ */
+ public static final int MIN_SUB_EXPONENT = Double.MIN_EXPONENT -
+ (SIGNIFICAND_WIDTH - 1);
+
+ static {
+ // verify bit masks cover all bit positions and that the bit
+ // masks are non-overlapping
+ assert(((SIGN_BIT_MASK | EXP_BIT_MASK | SIGNIF_BIT_MASK) == ~0L) &&
+ (((SIGN_BIT_MASK & EXP_BIT_MASK) == 0L) &&
+ ((SIGN_BIT_MASK & SIGNIF_BIT_MASK) == 0L) &&
+ ((EXP_BIT_MASK & SIGNIF_BIT_MASK) == 0L)));
+ }
+}
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/java/lang/Math/FloatConsts.java Fri Aug 22 18:54:20 2014 -0700
@@ -0,0 +1,74 @@
+/*
+ * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code 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 General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/**
+ * Common library for additional constants of the {@code float} type.
+ */
+public final class FloatConsts {
+ /**
+ * Don't let anyone instantiate this class.
+ */
+ private FloatConsts() {}
+
+ /**
+ * Bias used in representing a {@code float} exponent.
+ */
+ public static final int EXP_BIAS = 127;
+
+ /**
+ * Bit mask to isolate the exponent field of a {@code float}.
+ */
+ public static final int EXP_BIT_MASK = 0x7F800000;
+
+ /**
+ * Bit mask to isolate the sign bit of a {@code float}.
+ */
+ public static final int SIGN_BIT_MASK = 0x80000000;
+
+ /**
+ * Bit mask to isolate the significand field of a {@code float}.
+ */
+ public static final int SIGNIF_BIT_MASK = 0x007FFFFF;
+
+ /**
+ * The number of logical bits in the significand of a
+ * {@code float} number, including the implicit bit.
+ */
+ public static final int SIGNIFICAND_WIDTH = 24;
+
+ /**
+ * The exponent the smallest positive {@code float} subnormal
+ * value would have if it could be normalized.
+ */
+ public static final int MIN_SUB_EXPONENT = Float.MIN_EXPONENT -
+ (SIGNIFICAND_WIDTH - 1);
+
+ static {
+ // verify bit masks cover all bit positions and that the bit
+ // masks are non-overlapping
+ assert(((SIGN_BIT_MASK | EXP_BIT_MASK | SIGNIF_BIT_MASK) == ~0) &&
+ (((SIGN_BIT_MASK & EXP_BIT_MASK) == 0) &&
+ ((SIGN_BIT_MASK & SIGNIF_BIT_MASK) == 0) &&
+ ((EXP_BIT_MASK & SIGNIF_BIT_MASK) == 0)));
+ }
+}