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

runtime/vm/intermediate_language_x64.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"  // Needed here to get TARGET_ARCH_X64.
 #if defined(TARGET_ARCH_X64)
 
 #include "vm/intermediate_language.h"
 
 #include "vm/compiler.h"
@@ skipping 6488 matching lines @@
   // Calculate the final absolute address.
   if (offset()->definition()->representation() == kTagged) {
     __ SmiUntag(offset_reg);
   }
   __ addq(target_address_reg, offset_reg);
 
   // Jump to the absolute address.
   __ 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;
   const intptr_t kNumTemps = 0;
   if (needs_number_check()) {
     LocationSummary* locs = new (zone)
         LocationSummary(zone, kNumInputs, kNumTemps, LocationSummary::kCall);
     locs->set_in(0, Location::RegisterLocation(RAX));
     locs->set_in(1, Location::RegisterLocation(RCX));
     locs->set_out(0, Location::RegisterLocation(RAX));
@@ skipping 127 matching lines @@
   compiler->AddCurrentDescriptor(stub_kind_, deopt_id_, token_pos());
   compiler->RecordSafepoint(locs());
 }
 
 
 }  // namespace dart
 
 #undef __
 
 #endif  // defined TARGET_ARCH_X64