Cleanup of contexts in the full code generator.

Review URL: http://codereview.chromium.org/3449004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@5511 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/ast.h

@@ -172,18 +172,6 @@ class Statement: public AstNode {
 
 class Expression: public AstNode {
  public:
-  enum Context {
-    // Not assigned a context yet, or else will not be visited during
-    // code generation.
-    kUninitialized,
-    // Evaluated for its side effects.
-    kEffect,
-    // Evaluated for its value (and side effects).
-    kValue,
-    // Evaluated for control flow (and side effects).
-    kTest
-  };
-
   Expression() : bitfields_(0) {}
 
   virtual Expression* AsExpression()  { return this; }

src/ia32/macro-assembler-ia32.cc

@@ -1361,6 +1361,13 @@ void MacroAssembler::Drop(int stack_elements) {
 }
 
 
+void MacroAssembler::Move(Register dst, Register src) {
+  if (!dst.is(src)) {
+    mov(dst, src);
+  }
+}
+
+
 void MacroAssembler::Move(Register dst, Handle<Object> value) {
   mov(dst, value);
 }

src/ia32/macro-assembler-ia32.h

@@ -505,6 +505,9 @@ class MacroAssembler: public Assembler {
 
   void Call(Label* target) { call(target); }
 
+  // Move if the registers are not identical.
+  void Move(Register target, Register source);
+
   void Move(Register target, Handle<Object> value);
 
   Handle<Object> CodeObject() { return code_object_; }

src/x64/macro-assembler-x64.cc

@@ -1207,6 +1207,15 @@ SmiIndex MacroAssembler::SmiToNegativeIndex(Register dst,
 }
 
 
+void MacroAssembler::Move(Register dst, Register src) {
+  if (!dst.is(src)) {
+    movq(dst, src);
+  }
+}
+
+
+
+
 void MacroAssembler::Move(Register dst, Handle<Object> source) {
   ASSERT(!source->IsFailure());
   if (source->IsSmi()) {

src/x64/macro-assembler-x64.h

@@ -557,6 +557,9 @@ class MacroAssembler: public Assembler {
   void Set(Register dst, int64_t x);
   void Set(const Operand& dst, int64_t x);
 
+  // Move if the registers are not identical.
+  void Move(Register target, Register source);
+
   // Handle support
   void Move(Register dst, Handle<Object> source);
   void Move(const Operand& dst, Handle<Object> source);