Fixed a bug in isNegate intrinsified code, fixed negation for doubles (handling of negative zeros...

runtime/vm/opt_code_generator_ia32.cc

 // Copyright (c) 2011, 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/opt_code_generator.h"
 
 #include "vm/assembler_macros.h"
@@ skipping 852 matching lines @@
     ASSERT(kResultRegister == EAX);
     __ popl(kOperandRegister);
   } else if (info.is_temp()) {
     __ movl(kResultRegister, kOperandRegister);
   } else {
     const Double& double_object =
         Double::ZoneHandle(Double::New(0.0, Heap::kOld));
     __ LoadObject(kResultRegister, double_object);
   }
   __ movsd(XMM0, FieldAddress(kOperandRegister, Double::value_offset()));
-  __ xorps(XMM1, XMM1);  // 0.0 -> XMM1.
   ASSERT(node->kind() == Token::kSUB);
-  __ subsd(XMM1, XMM0);
-  __ movsd(FieldAddress(kResultRegister, Double::value_offset()), XMM1);
+  __ DoubleNegate(XMM0);
+  __ movsd(FieldAddress(kResultRegister, Double::value_offset()), XMM0);
   if (CodeGenerator::IsResultNeeded(node)) {
     if (node->info() != NULL) {
       node->info()->set_is_temp(using_temp);
       node->info()->set_is_class(&double_class_);
     }
     HandleResult(node, kResultRegister);
   }
 }
 
 
@@ skipping 2237 matching lines @@
     }
   }
   // TODO(srdjan): Implement unary kSUB (negate) Mint.
   CodeGenerator::VisitUnaryOpNode(node);
 }
 
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_IA32