A64: Tidy up Push and Pop TODOs.

src/a64/macro-assembler-a64.h

Index: src/a64/macro-assembler-a64.h
diff --git a/src/a64/macro-assembler-a64.h b/src/a64/macro-assembler-a64.h
index 7b8dd3f806734d3f4dfed8b984998b39da58b402..59fa9131cbd70b619a0a1cfc847c3bf8ad1ba050 100644
--- a/src/a64/macro-assembler-a64.h
+++ b/src/a64/macro-assembler-a64.h
@@ -28,6 +28,8 @@
 #ifndef V8_A64_MACRO_ASSEMBLER_A64_H_
 #define V8_A64_MACRO_ASSEMBLER_A64_H_
 
+#include <vector>
+
 #include "v8globals.h"
 #include "globals.h"
 
@@ -516,7 +518,8 @@ class MacroAssembler : public Assembler {
   }
 
   // Push the specified register 'count' times.
-  void PushMultipleTimes(int count, Register src);
+  void PushMultipleTimes(CPURegister src, Register count);
+  void PushMultipleTimes(CPURegister src, int count);
 
   // This is a convenience method for pushing a single Handle<Object>.
   inline void Push(Handle<Object> handle);
@@ -530,6 +533,35 @@ class MacroAssembler : public Assembler {
     Pop(dst);
   }
 
+  // Sometimes callers need to push or pop multiple registers in a way that is
+  // difficult to structure efficiently for fixed Push or Pop calls. This scope
+  // allows push requests to be queued up, then flushed at once. The
+  // MacroAssembler will try to generate the most efficient sequence required.
+  //
+  // Unlike the other Push and Pop macros, PushPopQueue can handle mixed sets of
+  // register sizes and types.
+  class PushPopQueue {
+   public:
+    explicit PushPopQueue(MacroAssembler* masm) : masm_(masm), size_(0) { }
+
+    ~PushPopQueue() {
+      ASSERT(queued_.empty());
+    }
+
+    void Queue(const CPURegister& rt) {
+      size_ += rt.SizeInBytes();
+      queued_.push_back(rt);
+    }
+
+    void PushQueued();
+    void PopQueued();
+
+   private:
+    MacroAssembler* masm_;
+    int size_;
+    std::vector<CPURegister> queued_;
+  };
+
   // Poke 'src' onto the stack. The offset is in bytes.
   //
   // If the current stack pointer (according to StackPointer()) is csp, then
@@ -2002,9 +2034,12 @@ class MacroAssembler : public Assembler {
 
   // Perform necessary maintenance operations before a push or pop.
   //
-  // Note that size is per register, and is specified in bytes.
-  void PrepareForPush(int count, int size);
-  void PrepareForPop(int count, int size);
+  // Note that size is specified in bytes.
+  void PrepareForPush(Operand total_size);
+  void PrepareForPop(Operand total_size);
+
+  void PrepareForPush(int count, int size) { PrepareForPush(count * size); }
+  void PrepareForPop(int count, int size) { PrepareForPop(count * size); }
 
   // Call Printf. On a native build, a simple call will be generated, but if the
   // simulator is being used then a suitable pseudo-instruction is used. The