Use static final int for IEEE exponent shift constant.
Closes #156.
diff --git a/src/main/java/org/apache/commons/math4/optim/linear/SimplexTableau.java b/src/main/java/org/apache/commons/math4/optim/linear/SimplexTableau.java
index 9525f25..0913604 100644
--- a/src/main/java/org/apache/commons/math4/optim/linear/SimplexTableau.java
+++ b/src/main/java/org/apache/commons/math4/optim/linear/SimplexTableau.java
@@ -87,6 +87,8 @@
private static final int MIN_IEEE_EXP = 0;
/** IEEE exponent is kept in an offset form, 1023 is zero **/
private static final int OFFSET_IEEE_EXP = 1023;
+ /** double exponent shift per IEEE standard **/
+ public static final int IEEE_EXPONENT_SHIFT = 52;
/** Linear objective function. */
private final LinearObjectiveFunction f;
@@ -421,7 +423,7 @@
*/
private static int exponent(double d) {
long bits = Double.doubleToLongBits(d);
- return (int) ((bits & EXPN) >>> 52);
+ return (int) ((bits & EXPN) >>> IEEE_EXPONENT_SHIFT);
}
/**
@@ -436,7 +438,7 @@
return d;
}
long bits = Double.doubleToLongBits(d);
- return Double.longBitsToDouble((bits & FRAC) | ((((bits & EXPN) >>> 52) + exp) << 52));
+ return Double.longBitsToDouble((bits & FRAC) | ((((bits & EXPN) >>> IEEE_EXPONENT_SHIFT) + exp) << IEEE_EXPONENT_SHIFT));
}
/**
