Implement some conditional moves instructions for ia32/x64. Use them in MinMax instruction implemen…

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 "lib/error.h"
@@ skipping 3796 matching lines @@
       __ j(NOT_ZERO, &done, Assembler::kNearJump);  // Negative -> return left.
     } else {
       ASSERT(left == result);
       __ j(ZERO, &done, Assembler::kNearJump);  // Positive -> return left.
     }
     __ movsd(result, right);
     __ Bind(&done);
     return;
   }
 
-  Label done;
   ASSERT(result_cid() == kSmiCid);
   Register left = locs()->in(0).reg();
   Register right = locs()->in(1).reg();
   Register result = locs()->out().reg();
   __ cmpq(left, right);
   ASSERT(result == left);
   if (is_min) {
-    __ j(LESS_EQUAL, &done, Assembler::kNearJump);
+    __ cmovgeq(result, right);
   } else {
-    __ j(GREATER_EQUAL, &done, Assembler::kNearJump);
+    __ cmovlessq(result, right);
   }
-  __ movq(result, right);
-  __ Bind(&done);
 }
 
 
 void UnarySmiOpInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   Register value = locs()->in(0).reg();
   ASSERT(value == locs()->out().reg());
   switch (op_kind()) {
     case Token::kNEGATE: {
       Label* deopt = compiler->AddDeoptStub(deopt_id(),
                                             kDeoptUnaryOp);
@@ skipping 710 matching lines @@
                          PcDescriptors::kOther,
                          locs());
   __ Drop(2);  // Discard type arguments and receiver.
 }
 
 }  // namespace dart
 
 #undef __
 
 #endif  // defined TARGET_ARCH_X64