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// SPDX-License-Identifier: Apache-2.0
package chiselTests
import chisel3._
import chisel3.stage.ChiselStage
import chisel3.testers.BasicTester
class GCD extends Module {
val io = IO(new Bundle {
val a = Input(UInt(32.W))
val b = Input(UInt(32.W))
val e = Input(Bool())
val z = Output(UInt(32.W))
val v = Output(Bool())
})
val x = Reg(UInt(32.W))
val y = Reg(UInt(32.W))
when(x > y) { x := x -% y }.otherwise { y := y -% x }
when(io.e) { x := io.a; y := io.b }
io.z := x
io.v := y === 0.U
}
class GCDTester(a: Int, b: Int, z: Int) extends BasicTester {
val dut = Module(new GCD)
val first = RegInit(true.B)
dut.io.a := a.U
dut.io.b := b.U
dut.io.e := first
when(first) { first := false.B }
when(!first && dut.io.v) {
assert(dut.io.z === z.U)
stop()
}
}
class GCDSpec extends ChiselPropSpec {
//TODO: use generators and this function to make z's
def gcd(a: Int, b: Int): Int = if (b == 0) a else gcd(b, a % b)
val gcds = Table(
("a", "b", "z"), // First tuple defines column names
(64, 48, 16), // Subsequent tuples define the data
(12, 9, 3),
(48, 64, 16)
)
property("GCD should elaborate") {
ChiselStage.elaborate { new GCD }
}
property("GCDTester should return the correct result") {
forAll(gcds) { (a: Int, b: Int, z: Int) =>
assertTesterPasses { new GCDTester(a, b, z) }
}
}
}
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