Merge pull request scala#2352 from soc/nan-tests

Add float version of the double NaN tests

Author: paulp

test/files/run/blame_eye_triple_eee.check renamed to test/files/run/blame_eye_triple_eee-double.check

@@ -0,0 +1,9 @@
+if (NaN == NaN) is good
+if (x == x) is good
+if (x == NaN) is good
+if (NaN != NaN) is good
+if (x != x) is good
+if (NaN != x) is good
+x matching was good
+NaN matching was good
+loop with NaN was goood

test/files/run/blame_eye_triple_eee.flags renamed to test/files/run/blame_eye_triple_eee-double.flags

@@ -0,0 +1 @@
+-optimise

test/files/run/blame_eye_triple_eee.scala renamed to test/files/run/blame_eye_triple_eee-double.scala

@@ -0,0 +1,61 @@
+object Test extends App {
+  import Float.NaN
+
+  // NaN must not equal NaN no matter what optimizations are applied
+  // All the following will seem redundant, but to an optimizer
+  // they can appear different
+
+  val x = NaN
+
+  if (NaN == NaN)
+    println("if (NaN == NaN) is broken")
+  else
+    println("if (NaN == NaN) is good")
+
+  if (x == x)
+    println("if (x == x) is broken")
+  else
+    println("if (x == x) is good")
+
+  if (x == NaN)
+    println("if (x == NaN) is broken")
+  else
+    println("if (x == NaN) is good")
+
+  if (NaN != NaN)
+    println("if (NaN != NaN) is good")
+  else
+    println("if (NaN != NaN) broken")
+
+  if (x != x)
+    println("if (x != x) is good")
+  else
+    println("if (x != x) broken")
+
+  if (NaN != x)
+    println("if (NaN != x) is good")
+  else
+    println("if (NaN != x) is broken")
+
+  x match {
+    case 0.0f => println("x matched 0!")
+    case NaN => println("x matched NaN!")
+    case _ => println("x matching was good")
+  }
+
+  NaN match {
+    case 0.0f => println("NaN matched 0!")
+    case NaN => println("NaN matched NaN!")
+    case _ => println("NaN matching was good")
+  }
+
+  var z = 0.0f
+  var i = 0
+  while (i < 10) {
+    if (i % 2 == 0) z = NaN
+    else z = NaN
+    i += 1
+  }
+  if (z.isNaN && i == 10) println("loop with NaN was goood")
+  else println("loop with NaN was broken")
+}