}
+Range* HShr::InferRange() {
+ if (right()->IsConstant()) {
+ HConstant* c = HConstant::cast(right());
+ if (c->HasInteger32Value()) {
+ int shift_count = c->Integer32Value() & 0x1f;
+ if (left()->range()->CanBeNegative()) {
+ // Only compute bounds if the result always fits into an int32.
+ return (shift_count >= 1)
+ ? new Range(0, static_cast<uint32_t>(0xffffffff) >> shift_count)
+ : new Range();
+ } else {
+ // For positive inputs we can use the >> operator.
+ Range* result = (left()->range() != NULL)
+ ? left()->range()->Copy()
+ : new Range();
+ result->Sar(c->Integer32Value());
+ return result;
+ }
+ }
+ }
+ return HValue::InferRange();
+}
+
+
Range* HShl::InferRange() {
if (right()->IsConstant()) {
HConstant* c = HConstant::cast(right());
HShr(HValue* context, HValue* left, HValue* right)
: HBitwiseBinaryOperation(context, left, right) { }
+ virtual Range* InferRange();
virtual HType CalculateInferredType();
DECLARE_CONCRETE_INSTRUCTION(Shr)