Store log5(2) in BigDecimal

Author: fabioromano1

src/java.base/share/classes/java/math/BigDecimal.java

@@ -5239,6 +5239,8 @@ private static BigInteger fiveToTwoToThe(int n) {
         return pow;
     }
 
+    private static final double LOG_5_OF_2 = Math.log(2.0) / Math.log(5.0);
+
     /**
      * Remove insignificant trailing zeros from this
      * {@code BigInteger} value until the preferred scale is reached or no
@@ -5265,7 +5267,7 @@ private static BigDecimal createAndStripZerosToMatchScale(BigInteger intVal, int
 
         intVal = intVal.shiftRight(powsOf2); // remove powers of 2
         // maxPowsOf5 == ceil(log5(intVal)) roughly
-        long maxPowsOf5 = (long) Math.ceil(intVal.bitLength() * BigInteger.LOG_TWO / BigInteger.logCache[5]);
+        long maxPowsOf5 = (long) Math.ceil(intVal.bitLength() * LOG_5_OF_2);
         remainingZeros = Math.min(remainingZeros, maxPowsOf5);
 
         BigInteger[] qr; // quotient-remainder pair

src/java.base/share/classes/java/math/BigInteger.java

@@ -1296,10 +1296,10 @@ private static BigInteger valueOf(int[] val) {
     private static volatile BigInteger[][] powerCache;
 
     /** The cache of logarithms of radices for base conversion. */
-    static final double[] logCache;
+    private static final double[] logCache;
 
     /** The natural log of 2.  This is used in computing cache indices. */
-    static final double LOG_TWO = Math.log(2.0);
+    private static final double LOG_TWO = Math.log(2.0);
 
     static {
         assert 0 < KARATSUBA_THRESHOLD