VM-codegen: Add IL instruction to check if a Smi is in a constant range

runtime/vm/intermediate_language_x64.cc

Index: runtime/vm/intermediate_language_x64.cc
diff --git a/runtime/vm/intermediate_language_x64.cc b/runtime/vm/intermediate_language_x64.cc
index 6cff06c7fa2b8ab5927f66dc255cc2e656731b75..e9721fdfe0806be91319e018cda7dc5a4ad84b24 100644
--- a/runtime/vm/intermediate_language_x64.cc
+++ b/runtime/vm/intermediate_language_x64.cc
@@ -6506,6 +6506,30 @@ void IndirectGotoInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   __ jmp(target_address_reg);
 }
 
+
+LocationSummary* SmiRangeComparisonInstr::MakeLocationSummary(Zone* zone,
+                                                              bool opt) const {
+  const intptr_t kNumInputs = 1;
+  const intptr_t kNumTemps = 1;
+  LocationSummary* locs = new (zone)
+      LocationSummary(zone, kNumInputs, kNumTemps, LocationSummary::kNoCall);
+  locs->set_in(0, Location::RequiresRegister());
+  locs->set_temp(0, Location::RequiresRegister());
+  return locs;
+}
+
+
+Condition SmiRangeComparisonInstr::EmitComparisonCode(
+    FlowGraphCompiler* compiler,
+    BranchLabels labels) {
+  Register in = locs()->in(0).reg();
+  Register temp = locs()->temp(0).reg();
+  __ leaq(temp, Address(in, Smi::RawValue(-from_)));
+  __ cmpq(temp, Immediate(Smi::RawValue(to_ - from_)));
+  return is_negated() ? ABOVE : BELOW_EQUAL;
+}
+
+
 LocationSummary* StrictCompareInstr::MakeLocationSummary(Zone* zone,
                                                          bool opt) const {
   const intptr_t kNumInputs = 2;