}
+static InstanceType TestType(HHasInstanceType* instr) {
+ InstanceType from = instr->from();
+ InstanceType to = instr->to();
+ if (from == FIRST_TYPE) return to;
+ ASSERT(from == to || to == LAST_TYPE);
+ return from;
+}
+
+
+static Condition BranchCondition(HHasInstanceType* instr) {
+ InstanceType from = instr->from();
+ InstanceType to = instr->to();
+ if (from == to) return eq;
+ if (to == LAST_TYPE) return hs;
+ if (from == FIRST_TYPE) return ls;
+ UNREACHABLE();
+ return eq;
+}
+
+
void LCodeGen::DoHasInstanceType(LHasInstanceType* instr) {
- Abort("DoHasInstanceType unimplemented.");
+ Register input = ToRegister(instr->input());
+ Register result = ToRegister(instr->result());
+
+ ASSERT(instr->hydrogen()->value()->representation().IsTagged());
+ Label done;
+ __ tst(input, Operand(kSmiTagMask));
+ __ LoadRoot(result, Heap::kFalseValueRootIndex, eq);
+ __ b(eq, &done);
+ __ CompareObjectType(input, result, result, TestType(instr->hydrogen()));
+ Condition cond = BranchCondition(instr->hydrogen());
+ __ LoadRoot(result, Heap::kTrueValueRootIndex, cond);
+ __ LoadRoot(result, Heap::kFalseValueRootIndex, NegateCondition(cond));
+ __ bind(&done);
}