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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 good")
else println("loop with NaN was broken")
}
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