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 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 unsignedRightShift(IntegerStamp value, IntegerStamp shift) {
Kind kind = value.kind();
if (shift.lowerBound() == shift.upperBound()) {
long shiftMask = kind == Kind.Int ? 0x1FL : 0x3FL;
long shiftCount = shift.lowerBound() & shiftMask;
if (shiftCount != 0) {
long lowerBound;
long upperBound;
if (value.lowerBound() < 0) {
lowerBound = 0;
upperBound = IntegerStamp.defaultMask(kind) >>> shiftCount;
} else {
lowerBound = value.lowerBound() >>> shiftCount;
upperBound = value.upperBound() >>> shiftCount;
}
long mask = value.mask() >>> shiftCount;
return StampFactory.forInteger(kind, lowerBound, upperBound, mask);
}
}
long mask = IntegerStamp.maskFor(kind, value.lowerBound(), value.upperBound());
return stampForMask(kind, mask);
}