More compact code for strict compare with 0.

runtime/vm/flow_graph_compiler_ia32.cc

 // Copyright (c) 2012, 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_IA32.
 #if defined(TARGET_ARCH_IA32)
 
 #include "vm/flow_graph_compiler.h"
 
 #include "lib/error.h"
@@ skipping 1107 matching lines @@
     GenerateDartCall(deopt_id,
                      token_pos,
                      &StubCode::CallStaticFunctionLabel(),
                      PcDescriptors::kFuncCall,
                      locs);
   }
   __ Drop(argument_count);
 }
 
 
+void FlowGraphCompiler::EmitEqualityRegConstCompare(Register reg,
+                                                    const Object& obj) {
+  if (obj.IsSmi() && (Smi::Cast(obj).Value() == 0)) {
+    __ testl(reg, reg);
+  } else {
+    __ CompareObject(reg, obj);
+  }
+}
+
+
 void FlowGraphCompiler::LoadDoubleOrSmiToXmm(XmmRegister result,
                                              Register reg,
                                              Register temp,
                                              Label* not_double_or_smi) {
   Label is_smi, done;
   __ testl(reg, Immediate(kSmiTagMask));
   __ j(ZERO, &is_smi);
   __ CompareClassId(reg, kDoubleCid, temp);
   __ j(NOT_EQUAL, not_double_or_smi);
   __ movsd(result, FieldAddress(reg, Double::value_offset()));
@@ skipping 229 matching lines @@
   __ popl(ECX);
   __ popl(EAX);
 }
 
 
 #undef __
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_IA32