import static net.mograsim.logic.core.types.Bit.Z;
import java.util.ArrayList;
+import java.util.Arrays;
import java.util.List;
import net.mograsim.logic.core.LogicObservable;
public class Wire
{
public final String name;
- private BitVector values;
+ private BitVector cachedValues;
public final int travelTime;
private List<ReadEnd> attached = new ArrayList<>();
public final int width;
List<ReadWriteEnd> inputs = new ArrayList<>();
Timeline timeline;
+ private Bit[] bitsWithoutFusions;
+ FusionedBit[] fusedBits;
public Wire(Timeline timeline, int width, int travelTime)
{
private void initValues()
{
- values = U.toVector(width);
+ cachedValues = U.toVector(width);
+ bitsWithoutFusions = cachedValues.getBits();
}
private void setNewValues(BitVector newValues)
{
- values = newValues;
+ cachedValues = newValues;
notifyObservers();
}
- void recalculate()
+ private void invalidateCachedValuesForAllFusedWires()
{
+ invalidateCachedValues();
+ if (fusedBits != null)
+ for (FusionedBit fusion : fusedBits)
+ if (fusion != null)
+ fusion.invalidateCachedValuesForAllParticipatingWires();
+ }
+
+ private void invalidateCachedValues()
+ {
+ cachedValues = null;
+ notifyObservers();
+ }
+
+ void recalculateValuesWithoutFusions()
+ {
+ Bit[] bits = new Bit[width];
if (inputs.isEmpty())
- setNewValues(U.toVector(width));
+ Arrays.fill(bits, U);
else
{
- BitVectorMutator mutator = BitVectorMutator.empty();
- for (ReadWriteEnd wireArrayEnd : inputs)
- mutator.join(wireArrayEnd.getInputValues());
- setNewValues(mutator.toBitVector());
+ System.arraycopy(inputs.get(0).getInputValues().getBits(), 0, bits, 0, width);
+ for (int i = 1; i < inputs.size(); i++)
+ Bit.join(bits, inputs.get(i).getInputValues().getBits());
+ }
+ bitsWithoutFusions = bits;
+ if (fusedBits == null)
+ setNewValues(BitVector.of(bits));
+ else
+ invalidateCachedValuesForAllFusedWires();
+ }
+
+ private void recalculatedCachedValues()
+ {
+ Bit[] bits;
+ if (fusedBits == null)
+ bits = bitsWithoutFusions;
+ else
+ {
+ bits = new Bit[width];
+ for (int i = 0; i < width; i++)
+ {
+ FusionedBit fusion = fusedBits[i];
+ if (fusion == null)
+ bits[i] = bitsWithoutFusions[i];
+ else
+ bits[i] = fusion.getValue();
+ }
}
+ cachedValues = BitVector.of(bits);
}
/**
*/
public boolean hasNumericValue()
{
- return values.isBinary();
+ return getValues().isBinary();
}
/**
{
long val = 0;
long mask = 1;
- for (Bit bit : values)
+ for (Bit bit : getValues())
{
switch (bit)
{
*/
public Bit getValue(int index)
{
- return values.getLSBit(index);
+ return getValues().getLSBit(index);
}
public BitVector getValues(int start, int end)
{
- return values.subVector(start, end);
+ return getValues().subVector(start, end);
}
public BitVector getValues()
{
- return values;
+ if (cachedValues == null)
+ recalculatedCachedValues();
+ return cachedValues;
}
/**
void registerInput(ReadWriteEnd toRegister)
{
inputs.add(toRegister);
- recalculate();
+ recalculateValuesWithoutFusions();
}
/**
{
inputs.remove(this);
detachEnd(this);
- recalculate();
+ recalculateValuesWithoutFusions();
}
public int width()
Bit[] vals = inputValues.getBits();
System.arraycopy(newValues.getBits(), 0, vals, startingBit, newValues.length());
inputValues = BitVector.of(vals);
- Wire.this.recalculate();
+ Wire.this.recalculateValuesWithoutFusions();
}
}
if (inputValues.equals(newValues))
return;
inputValues = newValues;
- Wire.this.recalculate();
+ Wire.this.recalculateValuesWithoutFusions();
}
/**
inputs.add(this);
else
inputs.remove(this);
- Wire.this.recalculate();
+ Wire.this.recalculateValuesWithoutFusions();
}
}
public String toString()
{
String name = this.name == null ? String.format("0x%08x", hashCode()) : this.name;
- return String.format("wire %s value: %s inputs: %s", name, values, inputs);
+ return String.format("wire %s value: %s inputs: %s", name, getValues(), inputs);
}
public static ReadEnd[] extractEnds(Wire[] w)
*/
public static void fuse(Wire a, Wire b, int fromA, int fromB, int width)
{
- ReadWriteEnd rA = a.createReadWriteEnd(), rB = b.createReadWriteEnd();
- rA.registerObserver(x -> rB.feedSignals(fromB, rA.wireValuesExcludingMe().subVector(fromA, fromA + width)));
- rB.registerObserver(x -> rA.feedSignals(fromA, rB.wireValuesExcludingMe().subVector(fromB, fromB + width)));
+ // TODO checks
+ for (int i = 0; i < width; i++)
+ fuse(a, b, fromA + i, fromB + i);
+// ReadWriteEnd rA = a.createReadWriteEnd(), rB = b.createReadWriteEnd();
+// rA.registerObserver(x -> rB.feedSignals(fromB, rA.wireValuesExcludingMe().subVector(fromA, fromA + width)));
+// rB.registerObserver(x -> rA.feedSignals(fromA, rB.wireValuesExcludingMe().subVector(fromB, fromB + width)));
+//
+// rA.setValues(0, BitVector.of(Bit.Z, fromA));
+// rB.setValues(0, BitVector.of(Bit.Z, fromB));
+// rA.setValues(fromA + width, BitVector.of(Bit.Z, a.width - width - fromA));
+// rB.setValues(fromB + width, BitVector.of(Bit.Z, b.width - width - fromB));
+//
+// rA.notifyObservers();
+// rB.notifyObservers();
+ }
+
+ /**
+ * Fuses one bit of two wires together. If this bit changes in one Wire, the other is changed accordingly immediately. Warning: The bits
+ * are permanently fused together.
+ *
+ * @param a The {@link Wire} to be (partially) fused with b
+ * @param b The {@link Wire} to be (partially) fused with a
+ * @param bitA The bit of {@link Wire} a to be fused
+ * @param bitB The bit of {@link Wire} b to be fused
+ */
+ private static void fuse(Wire a, Wire b, int bitA, int bitB)
+ {
+ if (a.fusedBits == null)
+ a.fusedBits = new FusionedBit[a.width];
+ if (b.fusedBits == null)
+ b.fusedBits = new FusionedBit[b.width];
+ FusionedBit oldFusionA = a.fusedBits[bitA];
+ FusionedBit oldFusionB = b.fusedBits[bitB];
+ if (oldFusionA == null)
+ if (oldFusionB == null)
+ {
+ FusionedBit fusion = new FusionedBit();
+ fusion.addParticipatingWireBit(a, bitA);
+ fusion.addParticipatingWireBit(b, bitB);
+ } else
+ oldFusionB.addParticipatingWireBit(a, bitA);
+ else if (oldFusionB == null)
+ oldFusionA.addParticipatingWireBit(b, bitB);
+ else
+ oldFusionA.mergeOtherIntoThis(oldFusionB);
+ }
+
+ private static class FusionedBit
+ {
+ private final List<WireBit> participatingWireBits;
+
+ public FusionedBit()
+ {
+ this.participatingWireBits = new ArrayList<>();
+ }
+
+ public void addParticipatingWireBit(Wire w, int bit)
+ {
+ addParticipatingWireBit(new WireBit(w, bit));
+ }
+
+ private void addParticipatingWireBit(WireBit wb)
+ {
+ wb.wire.fusedBits[wb.bit] = this;
+ participatingWireBits.add(wb);
+ wb.wire.invalidateCachedValuesForAllFusedWires();
+ }
+
+ public void mergeOtherIntoThis(FusionedBit other)
+ {
+ for (WireBit wb : other.participatingWireBits)
+ addParticipatingWireBit(wb);
+ }
- rA.setValues(0, BitVector.of(Bit.Z, fromA));
- rB.setValues(0, BitVector.of(Bit.Z, fromB));
- rA.setValues(fromA + width, BitVector.of(Bit.Z, a.width - width - fromA));
- rB.setValues(fromB + width, BitVector.of(Bit.Z, b.width - width - fromB));
+ public void invalidateCachedValuesForAllParticipatingWires()
+ {
+ for (WireBit wb : participatingWireBits)
+ wb.wire.invalidateCachedValues();
+ }
- rA.notifyObservers();
- rB.notifyObservers();
+ public Bit getValue()
+ {
+ if (participatingWireBits.isEmpty())
+ return Bit.U;
+ Bit result = null;
+ for (WireBit wb : participatingWireBits)
+ if (!wb.wire.inputs.isEmpty())
+ {
+ Bit bit = wb.wire.bitsWithoutFusions[wb.bit];
+ result = result == null ? bit : result.join(bit);
+ }
+ return result == null ? U : result;
+ }
+ }
+
+ private static class WireBit
+ {
+ public final Wire wire;
+ public final int bit;
+
+ public WireBit(Wire wire, int bit)
+ {
+ this.wire = wire;
+ this.bit = bit;
+ }
}
}
\ No newline at end of file
projects / Mograsim.git / commitdiff