Revert r10379: "Remove duplicate code for smi and double comparison from the compiler."

vm/intermediate_language_x64.cc

Index: vm/intermediate_language_x64.cc
===================================================================
--- vm/intermediate_language_x64.cc	(revision 10380)
+++ vm/intermediate_language_x64.cc	(working copy)
@@ -284,6 +284,59 @@
 }
 
 
+// Optional integer arguments can often be null. Null is not collected
+// by IC data. TODO(srdjan): Shall we collect null classes in ICData as well?
+static void EmitSmiEqualityCompare(FlowGraphCompiler* compiler,
+                                   EqualityCompareComp* comp) {
+  Register left = comp->locs()->in(0).reg();
+  Register right = comp->locs()->in(1).reg();
+  Register temp = comp->locs()->temp(0).reg();
+  Label* deopt = compiler->AddDeoptStub(comp->deopt_id(),
+                                        comp->token_pos(),
+                                        comp->try_index(),
+                                        kDeoptSmiCompareSmi,
+                                        left,
+                                        right);
+  __ movq(temp, left);
+  __ orq(temp, right);
+  __ testq(temp, Immediate(kSmiTagMask));
+  __ j(NOT_ZERO, deopt);
+  __ cmpq(left, right);
+  Register result = comp->locs()->out().reg();
+  Label load_true, done;
+  __ j(TokenKindToSmiCondition(comp->kind()), &load_true, Assembler::kNearJump);
+  __ LoadObject(result, compiler->bool_false());
+  __ jmp(&done, Assembler::kNearJump);
+  __ Bind(&load_true);
+  __ LoadObject(result, compiler->bool_true());
+  __ Bind(&done);
+}
+
+
+// TODO(srdjan): Add support for mixed Smi/Double equality
+// (see LoadDoubleOrSmiToXmm).
+static void EmitDoubleEqualityCompare(FlowGraphCompiler* compiler,
+                                      EqualityCompareComp* comp) {
+  Register left = comp->locs()->in(0).reg();
+  Register right = comp->locs()->in(1).reg();
+  Label* deopt = compiler->AddDeoptStub(comp->deopt_id(),
+                                        comp->token_pos(),
+                                        comp->try_index(),
+                                        kDeoptDoubleCompareDouble,
+                                        left,
+                                        right);
+  __ CompareClassId(left, kDouble);
+  __ j(NOT_EQUAL, deopt);
+  __ CompareClassId(right, kDouble);
+  __ j(NOT_EQUAL, deopt);
+  __ movsd(XMM0, FieldAddress(left, Double::value_offset()));
+  __ movsd(XMM1, FieldAddress(right, Double::value_offset()));
+  compiler->EmitDoubleCompareBool(TokenKindToSmiCondition(comp->kind()),
+                                  XMM0, XMM1,
+                                  comp->locs()->out().reg());
+}
+
+
 static void EmitEqualityAsInstanceCall(FlowGraphCompiler* compiler,
                                        EqualityCompareComp* comp) {
   compiler->AddCurrentDescriptor(PcDescriptors::kDeopt,
@@ -451,6 +504,45 @@
 }
 
 
+void EqualityCompareComp::EmitNativeCode(FlowGraphCompiler* compiler) {
+  if (receiver_class_id() == kSmi) {
+    EmitSmiEqualityCompare(compiler, this);
+    return;
+  }
+  if (receiver_class_id() == kDouble) {
+    EmitDoubleEqualityCompare(compiler, this);
+    return;
+  }
+  if (HasICData() && (ic_data()->NumberOfChecks() > 0)) {
+    EmitGenericEqualityCompare(compiler, *locs(), kind(), NULL, *ic_data(),
+                               deopt_id(), token_pos(), try_index());
+  } else {
+    Register left = locs()->in(0).reg();
+    Register right = locs()->in(1).reg();
+    __ pushq(left);
+    __ pushq(right);
+    EmitEqualityAsInstanceCall(compiler, this);
+  }
+}
+
+
+LocationSummary* RelationalOpComp::MakeLocationSummary() const {
+  if (operands_class_id() == kSmi || operands_class_id() == kDouble) {
+    const intptr_t kNumInputs = 2;
+    const intptr_t kNumTemps = 1;
+    LocationSummary* summary =
+        new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
+    summary->set_in(0, Location::RequiresRegister());
+    summary->set_in(1, Location::RequiresRegister());
+    summary->set_out(Location::RequiresRegister());
+    summary->set_temp(0, Location::RequiresRegister());
+    return summary;
+  }
+  ASSERT(operands_class_id() == kObject);
+  return MakeCallSummary();
+}
+
+
 static void EmitSmiComparisonOp(FlowGraphCompiler* compiler,
                                 const LocationSummary& locs,
                                 Token::Kind kind,
@@ -536,47 +628,6 @@
 }
 
 
-void EqualityCompareComp::EmitNativeCode(FlowGraphCompiler* compiler) {
-  if (receiver_class_id() == kSmi) {
-    EmitSmiComparisonOp(compiler, *locs(), kind(), NULL,  // No branch.
-                        deopt_id(), token_pos(), try_index());
-    return;
-  }
-  if (receiver_class_id() == kDouble) {
-    EmitDoubleComparisonOp(compiler, *locs(), kind(), NULL,  // No branch.
-                           deopt_id(), token_pos(), try_index());
-    return;
-  }
-  if (HasICData() && (ic_data()->NumberOfChecks() > 0)) {
-    EmitGenericEqualityCompare(compiler, *locs(), kind(), NULL, *ic_data(),
-                               deopt_id(), token_pos(), try_index());
-  } else {
-    Register left = locs()->in(0).reg();
-    Register right = locs()->in(1).reg();
-    __ pushq(left);
-    __ pushq(right);
-    EmitEqualityAsInstanceCall(compiler, this);
-  }
-}
-
-
-LocationSummary* RelationalOpComp::MakeLocationSummary() const {
-  if (operands_class_id() == kSmi || operands_class_id() == kDouble) {
-    const intptr_t kNumInputs = 2;
-    const intptr_t kNumTemps = 1;
-    LocationSummary* summary =
-        new LocationSummary(kNumInputs, kNumTemps, LocationSummary::kNoCall);
-    summary->set_in(0, Location::RequiresRegister());
-    summary->set_in(1, Location::RequiresRegister());
-    summary->set_out(Location::RequiresRegister());
-    summary->set_temp(0, Location::RequiresRegister());
-    return summary;
-  }
-  ASSERT(operands_class_id() == kObject);
-  return MakeCallSummary();
-}
-
-
 void RelationalOpComp::EmitNativeCode(FlowGraphCompiler* compiler) {
   if (operands_class_id() == kSmi) {
     EmitSmiComparisonOp(compiler, *locs(), kind(), NULL,