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// See LICENSE for license details.
package chiselTests
import chisel3._
import chisel3.experimental.FixedPoint
import chisel3.experimental.BundleLiterals._
import chisel3.testers.BasicTester
class LiteralExtractorSpec extends ChiselFlatSpec {
"litValue" should "return the literal value" in {
assert(0.U.litValue === BigInt(0))
assert(1.U.litValue === BigInt(1))
assert(42.U.litValue === BigInt(42))
assert(42.U.litValue === 42.U.litValue)
assert(0.S.litValue === BigInt(0))
assert(-1.S.litValue === BigInt(-1))
assert(-42.S.litValue === BigInt(-42))
assert(true.B.litValue === BigInt(1))
assert(false.B.litValue === BigInt(0))
assert(1.25.F(2.BP).litValue === BigInt("101", 2))
assert(2.25.F(2.BP).litValue === BigInt("1001", 2))
assert(-1.25.F(2.BP).litValue === BigInt("-101", 2))
assert(-2.25.F(2.BP).litValue === BigInt("-1001", 2))
}
"litToBoolean" should "return the literal value" in {
assert(true.B.litToBoolean === true)
assert(false.B.litToBoolean === false)
assert(1.B.litToBoolean === true)
assert(0.B.litToBoolean === false)
}
"litToDouble" should "return the literal value" in {
assert(1.25.F(2.BP).litToDouble == 1.25)
assert(2.25.F(2.BP).litToDouble == 2.25)
assert(-1.25.F(2.BP).litToDouble == -1.25)
assert(-2.25.F(2.BP).litToDouble == -2.25)
// test rounding
assert(1.24.F(1.BP).litToDouble == 1.0)
assert(1.25.F(1.BP).litToDouble == 1.5)
}
"litOption" should "return None for non-literal hardware" in {
elaborate { new RawModule {
val a = Wire(UInt())
assert(a.litOption == None)
}}
}
"literals declared outside a builder context" should "compare with those inside builder context" in {
class InsideBundle extends Bundle {
val x = SInt(8.W)
val y = FixedPoint(8.W, 4.BP)
}
class LitInsideOutsideTester(outsideLiteral: InsideBundle) extends BasicTester {
val insideLiteral = (new InsideBundle).Lit(_.x -> 7.S, _.y -> 6.125.F(4.BP))
// the following errors with "assertion failed"
println(outsideLiteral === insideLiteral) // scalastyle:ignore regex
// chisel3.assert(outsideLiteral === insideLiteral)
// the following lines of code error
// with "chisel3.internal.BundleLitBinding cannot be cast to chisel3.internal.ElementLitBinding"
chisel3.assert(outsideLiteral.x === insideLiteral.x)
chisel3.assert(outsideLiteral.y === insideLiteral.y)
chisel3.assert(outsideLiteral.x === 7.S)
chisel3.assert(outsideLiteral.y === 6.125.F(4.BP))
stop()
}
val outsideLiteral = (new InsideBundle).Lit(_.x -> 7.S, _.y -> 6.125.F(4.BP))
assertTesterPasses{ new LitInsideOutsideTester(outsideLiteral) }
}
"bundle literals" should "do the right thing" in {
class MyBundle extends Bundle {
val a = UInt(8.W)
val b = Bool()
}
val myBundleLiteral = (new MyBundle).Lit(_.a -> 42.U, _.b -> true.B)
assert(myBundleLiteral.a.litValue == 42)
assert(myBundleLiteral.b.litValue == 1)
assert(myBundleLiteral.b.litToBoolean == true)
}
}
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