public static Stamp add(IntegerStamp stamp1, IntegerStamp stamp2) {
Kind kind = stamp1.kind();
assert kind == stamp2.kind();
if (addOverflow(stamp1.lowerBound(), stamp2.lowerBound(), kind)) {
return StampFactory.forKind(kind);
}
if (addOverflow(stamp1.upperBound(), stamp2.upperBound(), kind)) {
return StampFactory.forKind(kind);
}
long lowerBound = stamp1.lowerBound() + stamp2.lowerBound();
long upperBound = stamp1.upperBound() + stamp2.upperBound();
long mask = IntegerStamp.maskFor(kind, lowerBound, upperBound);
return StampFactory.forInteger(kind, lowerBound, upperBound, mask);
}
public static Stamp div(IntegerStamp stamp1, IntegerStamp stamp2) {
Kind kind = stamp1.kind();
if (stamp2.isStrictlyPositive()) {
long lowerBound = stamp1.lowerBound() / stamp2.lowerBound();
long upperBound = stamp1.upperBound() / stamp2.lowerBound();
return StampFactory.forInteger(
kind, lowerBound, upperBound, IntegerStamp.maskFor(kind, lowerBound, upperBound));
}
return StampFactory.forKind(kind);
}
public static Stamp leftShift(IntegerStamp value, IntegerStamp shift) {
Kind kind = value.kind();
int shiftBits = kind == Kind.Int ? 5 : 6;
long shiftMask = kind == Kind.Int ? 0x1FL : 0x3FL;
if ((shift.lowerBound() >>> shiftBits) == (shift.upperBound() >>> shiftBits)) {
long mask = 0;
for (long i = shift.lowerBound() & shiftMask; i <= (shift.upperBound() & shiftMask); i++) {
mask |= value.mask() << i;
}
mask &= IntegerStamp.defaultMask(kind);
return stampForMask(kind, mask);
}
return StampFactory.forKind(kind);
}
public static Stamp negate(Stamp stamp) {
Kind kind = stamp.kind();
if (stamp instanceof IntegerStamp) {
IntegerStamp integerStamp = (IntegerStamp) stamp;
if (integerStamp.lowerBound() != kind.getMinValue()) {
// TODO(ls) check if the mask calculation is correct...
return new IntegerStamp(
kind,
-integerStamp.upperBound(),
-integerStamp.lowerBound(),
IntegerStamp.defaultMask(kind) & (integerStamp.mask() | -integerStamp.mask()));
}
}
return StampFactory.forKind(kind);
}
protected DirectReadNode(ValueNode address, Kind readKind) {
super(StampFactory.forKind(readKind.getStackKind()));
this.address = address;
this.readKind = readKind;
}