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, 15 insertions, 0 deletions

diff --git a/test/files/jvm/signum.scala b/test/files/jvm/signum.scala
new file mode 100644
index 0000000000..feb28d3e43
--- /dev/null
+++ b/test/files/jvm/signum.scala
@@ -0,0 +1,15 @@
+object Test {
+  def main(args: Array[String]) {
+    assert(math.signum(Long.MaxValue) == 1L)
+    assert(math.signum(1L) == 1L)
+    assert(math.signum(0L) == 0L)
+    assert(math.signum(-1L) == -1L)
+    assert(math.signum(Long.MinValue) == -1L)
+
+    assert(math.signum(Int.MaxValue) == 1)
+    assert(math.signum(1) == 1)
+    assert(math.signum(0) == 0)
+    assert(math.signum(-1) == -1)
+    assert(math.signum(Int.MinValue) == -1)
+  }
+}