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// SPDX-License-Identifier: Apache-2.0
// Useful utilities for tests
package chiselTests
import chisel3._
import chisel3.experimental.Interval
import chisel3.internal.firrtl.{IntervalRange, KnownBinaryPoint, Width}
import _root_.firrtl.{ir => firrtlir}
class PassthroughModuleIO extends Bundle {
val in = Input(UInt(32.W))
val out = Output(UInt(32.W))
}
trait AbstractPassthroughModule extends RawModule {
val io = IO(new PassthroughModuleIO)
io.out := io.in
}
class PassthroughModule extends Module with AbstractPassthroughModule
class PassthroughMultiIOModule extends Module with AbstractPassthroughModule
class PassthroughRawModule extends RawModule with AbstractPassthroughModule
case class ScalaIntervalSimulator(intervalRange: IntervalRange) {
val binaryPoint: Int = intervalRange.binaryPoint.asInstanceOf[KnownBinaryPoint].value
val epsilon: Double = 1.0 / math.pow(2.0, binaryPoint.toDouble)
val (lower, upper) = (intervalRange.lowerBound, intervalRange.upperBound) match {
case (firrtlir.Closed(lower1), firrtlir.Closed(upper1)) => (lower1, upper1)
case (firrtlir.Closed(lower1), firrtlir.Open(upper1)) => (lower1, upper1 - epsilon)
case (firrtlir.Open(lower1), firrtlir.Closed(upper1)) => (lower1 + epsilon, upper1)
case (firrtlir.Open(lower1), firrtlir.Open(upper1)) => (lower1 + epsilon, upper1 - epsilon)
case _ =>
throw new Exception(s"lower and upper bounds must be defined, range here is $intervalRange")
}
def clip(value: BigDecimal): BigDecimal = {
if (value < lower) {
lower
} else if (value > upper) {
upper
} else {
value
}
}
def wrap(value: BigDecimal): BigDecimal = {
if (value < lower) {
upper + (value - lower) + epsilon
} else if (value > upper) {
((value - upper) - epsilon) + lower
} else {
value
}
}
def allValues: Iterator[BigDecimal] = {
(lower to upper by epsilon).toIterator
}
def makeLit(value: BigDecimal): Interval = {
Interval.fromDouble(value.toDouble, width = Width(), binaryPoint = binaryPoint.BP)
}
}
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