Use (more) xor on FP register to load it with 0.0.

runtime/vm/flow_graph_compiler_ia32.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_IA32.
 #if defined(TARGET_ARCH_IA32)
 
 #include "vm/flow_graph_compiler.h"
 
 #include "vm/ast_printer.h"
@@ skipping 1576 matching lines @@
       }
     } else if (destination.IsFpuRegister()) {
       const Double& constant = Double::Cast(source.constant());
       uword addr = FlowGraphBuilder::FindDoubleConstant(constant.value());
       if (addr == 0) {
         __ pushl(EAX);
         __ LoadObject(EAX, constant);
         __ movsd(destination.fpu_reg(),
             FieldAddress(EAX, Double::value_offset()));
         __ popl(EAX);
+      } else if (Utils::DoublesBitEqual(constant.value(), 0.0)) {
+        __ xorps(destination.fpu_reg(), destination.fpu_reg());
       } else {
         __ movsd(destination.fpu_reg(), Address::Absolute(addr));
       }
     } else if (destination.IsDoubleStackSlot()) {
       const Double& constant = Double::Cast(source.constant());
       uword addr = FlowGraphBuilder::FindDoubleConstant(constant.value());
       if (addr == 0) {
         __ pushl(EAX);
         __ LoadObject(EAX, constant);
         __ movsd(XMM0, FieldAddress(EAX, Double::value_offset()));
         __ popl(EAX);
+      } else if (Utils::DoublesBitEqual(constant.value(), 0.0)) {
+        __ xorps(XMM0, XMM0);
       } else {
         __ movsd(XMM0, Address::Absolute(addr));
       }
       __ movsd(destination.ToStackSlotAddress(), XMM0);
     } else {
       ASSERT(destination.IsStackSlot());
       StoreObject(destination.ToStackSlotAddress(), source.constant());
     }
   }
 
@@ skipping 147 matching lines @@
   __ movups(reg, Address(ESP, 0));
   __ addl(ESP, Immediate(kFpuRegisterSize));
 }
 
 
 #undef __
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_IA32