Add stack check in loops so that loops can be stopped. Optimize relational operations.

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 967 matching lines @@
     __ cmpl(temp_reg, Immediate(class_ids[i]));
     if (i == class_ids.length() - 1) {
       __ j(NOT_EQUAL, deopt);
     } else {
       __ j(EQUAL, &is_ok, Assembler::kNearJump);
     }
   }
   __ Bind(&is_ok);
 }
 
+
+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);
+  __ LoadClassId(temp, reg);
+  __ cmpl(temp, Immediate(kDouble));
+  __ j(NOT_EQUAL, not_double_or_smi);
+  __ movsd(result, FieldAddress(reg, Double::value_offset()));
+  __ jmp(&done);
+  __ Bind(&is_smi);
+  __ movl(temp, reg);
+  __ SmiUntag(temp);
+  __ cvtsi2sd(result, temp);
+  __ Bind(&done);
+}
+
+
 #undef __
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_IA32