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// SPDX-License-Identifier: Apache-2.0
package chiselTests
import org.scalacheck._
import chisel3._
import chisel3.testers.BasicTester
import chisel3.util._
class Decoder(bitpats: List[String]) extends Module {
val io = IO(new Bundle {
val inst = Input(UInt(32.W))
val matched = Output(Bool())
})
io.matched := VecInit(bitpats.map(BitPat(_) === io.inst)).reduce(_ || _)
}
class DecoderTester(pairs: List[(String, String)]) extends BasicTester {
val (insts, bitpats) = pairs.unzip
val (cnt, wrap) = Counter(true.B, pairs.size)
val dut = Module(new Decoder(bitpats))
dut.io.inst := VecInit(insts.map(_.asUInt))(cnt)
when(!dut.io.matched) {
assert(cnt === 0.U)
stop()
}
when(wrap) {
stop()
}
}
class DecoderSpec extends ChiselPropSpec {
// 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 "?")
// The following randomly throws in white space and underscores which are legal and ignored.
val bpp = bp.map { a =>
if (rnd.nextBoolean) {
a
} else {
a + (if (rnd.nextBoolean) "_" else " ")
}
}.mkString
("b" + bs, "b" + bpp)
}
private def nPairs(n: Int) = Gen.containerOfN[List, (String, String)](n, bitpatPair)
property("BitPat wildcards should be usable in decoding") {
forAll(nPairs(4)) { (pairs: List[(String, String)]) =>
assertTesterPasses { new DecoderTester(pairs) }
}
}
}
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