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package chiselTests
import Chisel._
import org.scalatest._
import org.scalatest.prop._
import org.scalacheck._
import Chisel.testers.BasicTester
class Decoder(bitpats: List[String]) extends Module {
val io = new Bundle {
val inst = UInt(INPUT, 32)
val match_idx = UInt(OUTPUT, 5)
}
io.match_idx := Vec(bitpats.map(BitPat(_) === io.inst)).indexWhere{i: Bool => i}
}
class DecoderSpec extends ChiselPropSpec {
class DecoderTester(pairs: List[(String, String)]) extends BasicTester {
val (insts, bitpats) = pairs.unzip
val (cnt, wrap) = Counter(Bool(true), pairs.size)
val dut = Module(new Decoder(bitpats))
dut.io.inst := Vec(insts.map(UInt(_)))(cnt)
when(dut.io.match_idx != cnt) { io.done := Bool(true); io.error := cnt }
when(wrap) { io.done := Bool(true) }
}
// Use a single Int to make both a specific instruction and a BitPat that will match it
val bitpatPair = for(seed <- Arbitrary.arbitrary[Int]) yield {
val rnd = new scala.util.Random(seed)
val bs = seed.toBinaryString
val bp = bs.map(if(rnd.nextBoolean) _ else "?").mkString
("b"+bs, "b"+bp)
}
def nPairs(n: Int) = Gen.containerOfN[List, (String,String)](n,bitpatPair)
property("BitPat wildcards should be usable in decoding") {
forAll(nPairs(16)){ (pairs: List[(String, String)]) =>
assert(execute{ new DecoderTester(pairs) })
}
}
}
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