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// See LICENSE for license details.
package firrtl.passes
import scala.collection.mutable
import firrtl.PrimOps._
import firrtl.ir._
import firrtl._
import firrtl.Mappers._
import firrtl.Utils.{sub_type, module_type, field_type, max, throwInternalError}
import firrtl.options.Dependency
/** Replaces FixedType with SIntType, and correctly aligns all binary points
*/
object ConvertFixedToSInt extends Pass {
override def prerequisites =
Seq( Dependency(PullMuxes),
Dependency(ReplaceAccesses),
Dependency(ExpandConnects),
Dependency(RemoveAccesses),
Dependency[ExpandWhensAndCheck],
Dependency[RemoveIntervals] ) ++ firrtl.stage.Forms.Deduped
override def invalidates(a: Transform) = false
def alignArg(e: Expression, point: BigInt): Expression = e.tpe match {
case FixedType(IntWidth(w), IntWidth(p)) => // assert(point >= p)
if((point - p) > 0) {
DoPrim(Shl, Seq(e), Seq(point - p), UnknownType)
} else if (point - p < 0) {
DoPrim(Shr, Seq(e), Seq(p - point), UnknownType)
} else e
case FixedType(w, p) => throwInternalError(s"alignArg: shouldn't be here - $e")
case _ => e
}
def calcPoint(es: Seq[Expression]): BigInt =
es.map(_.tpe match {
case FixedType(IntWidth(w), IntWidth(p)) => p
case _ => BigInt(0)
}).reduce(max(_, _))
def toSIntType(t: Type): Type = t match {
case FixedType(IntWidth(w), IntWidth(p)) => SIntType(IntWidth(w))
case FixedType(w, p) => throwInternalError(s"toSIntType: shouldn't be here - $t")
case _ => t map toSIntType
}
def run(c: Circuit): Circuit = {
val moduleTypes = mutable.HashMap[String,Type]()
def onModule(m:DefModule) : DefModule = {
val types = mutable.HashMap[String,Type]()
def updateExpType(e:Expression): Expression = e match {
case DoPrim(Mul, args, consts, tpe) => e map updateExpType
case DoPrim(AsFixedPoint, args, consts, tpe) => DoPrim(AsSInt, args, Seq.empty, tpe) map updateExpType
case DoPrim(IncP, args, consts, tpe) => DoPrim(Shl, args, consts, tpe) map updateExpType
case DoPrim(DecP, args, consts, tpe) => DoPrim(Shr, args, consts, tpe) map updateExpType
case DoPrim(SetP, args, consts, FixedType(w, IntWidth(p))) => alignArg(args.head, p) map updateExpType
case DoPrim(op, args, consts, tpe) =>
val point = calcPoint(args)
val newExp = DoPrim(op, args.map(x => alignArg(x, point)), consts, UnknownType)
newExp map updateExpType match {
case DoPrim(AsFixedPoint, args, consts, tpe) => DoPrim(AsSInt, args, Seq.empty, tpe)
case e => e
}
case Mux(cond, tval, fval, tpe) =>
val point = calcPoint(Seq(tval, fval))
val newExp = Mux(cond, alignArg(tval, point), alignArg(fval, point), UnknownType)
newExp map updateExpType
case e: UIntLiteral => e
case e: SIntLiteral => e
case _ => e map updateExpType match {
case ValidIf(cond, value, tpe) => ValidIf(cond, value, value.tpe)
case WRef(name, tpe, k, g) => WRef(name, types(name), k, g)
case WSubField(exp, name, tpe, g) => WSubField(exp, name, field_type(exp.tpe, name), g)
case WSubIndex(exp, value, tpe, g) => WSubIndex(exp, value, sub_type(exp.tpe), g)
case WSubAccess(exp, index, tpe, g) => WSubAccess(exp, index, sub_type(exp.tpe), g)
}
}
def updateStmtType(s: Statement): Statement = s match {
case DefRegister(info, name, tpe, clock, reset, init) =>
val newType = toSIntType(tpe)
types(name) = newType
DefRegister(info, name, newType, clock, reset, init) map updateExpType
case DefWire(info, name, tpe) =>
val newType = toSIntType(tpe)
types(name) = newType
DefWire(info, name, newType)
case DefNode(info, name, value) =>
val newValue = updateExpType(value)
val newType = toSIntType(newValue.tpe)
types(name) = newType
DefNode(info, name, newValue)
case DefMemory(info, name, dt, depth, wL, rL, rs, ws, rws, ruw) =>
val newStmt = DefMemory(info, name, toSIntType(dt), depth, wL, rL, rs, ws, rws, ruw)
val newType = MemPortUtils.memType(newStmt)
types(name) = newType
newStmt
case WDefInstance(info, name, module, tpe) =>
val newType = moduleTypes(module)
types(name) = newType
WDefInstance(info, name, module, newType)
case Connect(info, loc, exp) =>
val point = calcPoint(Seq(loc))
val newExp = alignArg(exp, point)
Connect(info, loc, newExp) map updateExpType
case PartialConnect(info, loc, exp) =>
val point = calcPoint(Seq(loc))
val newExp = alignArg(exp, point)
PartialConnect(info, loc, newExp) map updateExpType
// check Connect case, need to shl
case s => (s map updateStmtType) map updateExpType
}
m.ports.foreach(p => types(p.name) = p.tpe)
m match {
case Module(info, name, ports, body) => Module(info,name,ports,updateStmtType(body))
case m:ExtModule => m
}
}
val newModules = for(m <- c.modules) yield {
val newPorts = m.ports.map(p => Port(p.info,p.name,p.direction,toSIntType(p.tpe)))
m match {
case Module(info, name, ports, body) => Module(info,name,newPorts,body)
case ext: ExtModule => ext.copy(ports = newPorts)
}
}
newModules.foreach(m => moduleTypes(m.name) = module_type(m))
/* @todo This should be moved outside */
(firrtl.passes.InferTypes).run(Circuit(c.info, newModules.map(onModule(_)), c.main ))
}
}
// vim: set ts=4 sw=4 et:
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