On 26 March 2013 14:56, <[email protected]> wrote:
> Author: luc
> Date: Tue Mar 26 14:56:01 2013
> New Revision: 1461159
>
> URL: http://svn.apache.org/r1461159
> Log:
> FastMath.abs() without branching for float and double primitive types.
>
> JIRA: MATH-954
>
> Modified:
>
> commons/proper/math/trunk/src/main/java/org/apache/commons/math3/util/FastMath.java
>
> Modified:
> commons/proper/math/trunk/src/main/java/org/apache/commons/math3/util/FastMath.java
> URL:
> http://svn.apache.org/viewvc/commons/proper/math/trunk/src/main/java/org/apache/commons/math3/util/FastMath.java?rev=1461159&r1=1461158&r2=1461159&view=diff
> ==============================================================================
> ---
> commons/proper/math/trunk/src/main/java/org/apache/commons/math3/util/FastMath.java
> (original)
> +++
> commons/proper/math/trunk/src/main/java/org/apache/commons/math3/util/FastMath.java
> Tue Mar 26 14:56:01 2013
> @@ -3011,10 +3011,7 @@ public class FastMath {
> * @return abs(x)
> */
> public static float abs(final float x) {
> - if ((Float.floatToRawIntBits(x) & Integer.MIN_VALUE) == 0) {
> - return x;
> - }
> - return -x;
> + return Float.intBitsToFloat(Integer.MAX_VALUE &
> Float.floatToRawIntBits(x));
It looks wrong using MAX_VALUE as a mask (even though the value is correct).
Is there a no better constant?
If not, it would be better to create one with appropriate Javadoc.
> }
>
> /**
> @@ -3023,10 +3020,7 @@ public class FastMath {
> * @return abs(x)
> */
> public static double abs(double x) {
> - if ((Double.doubleToRawLongBits(x) & Long.MIN_VALUE) == 0) {
> - return x;
> - }
> - return -x;
> + return Double.longBitsToDouble(Long.MAX_VALUE &
> Double.doubleToRawLongBits(x));
> }
>
> /**
>
>
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