8075806: divideExact is missing in java.lang.Math

Reviewed-by: darcy

src/java.base/share/classes/java/lang/StrictMath.java

@@ -66,13 +66,8 @@ import jdk.internal.vm.annotation.IntrinsicCandidate;
  * will not overflow the range of values of the computation.
  * The best practice is to choose the primitive type and algorithm to avoid
  * overflow. In cases where the size is {@code int} or {@code long} and
- * overflow errors need to be detected, the methods {@code addExact},
- * {@code subtractExact}, {@code multiplyExact}, {@code toIntExact},
- * {@code incrementExact}, {@code decrementExact} and {@code negateExact}
- * throw an {@code ArithmeticException} when the results overflow.
- * For the arithmetic operations divide and absolute value, overflow
- * occurs only with a specific minimum or maximum value and
- * should be checked against the minimum or maximum as appropriate.
+ * overflow errors need to be detected, the methods whose names end with
+ * {@code Exact} throw an {@code ArithmeticException} when the results overflow.
  *
  * <h2><a id=Ieee754RecommendedOps>IEEE 754 Recommended
  * Operations</a></h2>
@@ -858,6 +853,54 @@ public final class StrictMath {
         return Math.multiplyExact(x, y);
     }
 
+    /**
+     * Returns the quotient of the arguments, throwing an exception if the
+     * result overflows an {@code int}.  Such overflow occurs in this method if
+     * {@code x} is {@link Integer#MIN_VALUE} and {@code y} is {@code -1}.
+     * In contrast, if {@code Integer.MIN_VALUE / -1} were evaluated directly,
+     * the result would be {@code Integer.MIN_VALUE} and no exception would be
+     * thrown.
+     * <p>
+     * If {@code y} is zero, an {@code ArithmeticException} is thrown
+     * (JLS {@jls 15.17.2}).
+     *
+     * @param x the dividend
+     * @param y the divisor
+     * @return the quotient {@code x / y}
+     * @throws ArithmeticException if {@code y} is zero or the quotient
+     * overflows an int
+     * @jls 15.17.2 Division Operator /
+     * @see Math#divideExact(int,int)
+     * @since 18
+     */
+    public static int divideExact(int x, int y) {
+        return Math.divideExact(x, y);
+    }
+
+    /**
+     * Returns the quotient of the arguments, throwing an exception if the
+     * result overflows a {@code long}.  Such overflow occurs in this method if
+     * {@code x} is {@link Long#MIN_VALUE} and {@code y} is {@code -1}.
+     * In contrast, if {@code Long.MIN_VALUE / -1} were evaluated directly,
+     * the result would be {@code Long.MIN_VALUE} and no exception would be
+     * thrown.
+     * <p>
+     * If {@code y} is zero, an {@code ArithmeticException} is thrown
+     * (JLS {@jls 15.17.2}).
+     *
+     * @param x the dividend
+     * @param y the divisor
+     * @return the quotient {@code x / y}
+     * @throws ArithmeticException if {@code y} is zero or the quotient
+     * overflows a long
+     * @jls 15.17.2 Division Operator /
+     * @see Math#divideExact(long,long)
+     * @since 18
+     */
+    public static long divideExact(long x, long y) {
+        return Math.divideExact(x, y);
+    }
+
     /**
      * Returns the argument incremented by one,
      * throwing an exception if the result overflows an {@code int}.