Delegate to Java's implementation of signum for Long and Int.

The Java implementation is faster as it doesn't have branches.

java.lang.Math includes implementations of signum for Double and Float,
but I didn't change the ones in scala.math because there is a difference
on how negative zero is handled.

1 files changed, 3 insertions, 9 deletions

diff --git a/src/library/scala/math/package.scala b/src/library/scala/math/package.scala
index 8948722340..0417461f85 100644
--- a/src/library/scala/math/package.scala
+++ b/src/library/scala/math/package.scala
@@ -127,15 +127,9 @@ package object math {
     else if (x > 0) 1.0f
     else x    // NaN
 
-  def signum(x: Long): Long =
-    if (x == 0l) 0l
-    else if (x < 0) -1l
-    else 1l
-
-  def signum(x: Int): Int =
-    if (x == 0) 0
-    else if (x < 0) -1
-    else 1
+  def signum(x: Long): Long = java.lang.Long.signum(x)
+
+  def signum(x: Int): Int = java.lang.Integer.signum(x)
 
   // -----------------------------------------------------------------------
   // root functions