Implement a simple register allocator that tries to keep instruction results in registers.

runtime/vm/assembler_x64.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"
 #if defined(TARGET_ARCH_X64)
 
 #include "vm/assembler.h"
 #include "vm/heap.h"
 #include "vm/memory_region.h"
@@ skipping 1309 matching lines @@
 }
 
 
 void Assembler::MoveRegister(Register to, Register from) {
   if (to != from) {
     movq(to, from);
   }
 }
 
 
+void Assembler::PushRegister(Register r) {
+  pushq(r);
+}
+
+
+void Assembler::PopRegister(Register r) {
+  popq(r);
+}
+
+
 void Assembler::AddImmediate(Register reg, const Immediate& imm) {
   int64_t value = imm.value();
   if (value > 0) {
     if (value == 1) {
       incq(reg);
     } else if (value != 0) {
       addq(reg, imm);
     }
   } else if (value < 0) {
     value = -value;
@@ skipping 324 matching lines @@
     comments.SetCommentAt(i, comments_[i]->comment());
   }
 
   return comments;
 }
 
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64