Custom stack for IVM. 2-3x faster.

src/alloy/backend/ivm/ivm_stack.h

@@ -0,0 +1,57 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2013 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#ifndef ALLOY_BACKEND_IVM_IVM_STACK_H_
+#define ALLOY_BACKEND_IVM_IVM_STACK_H_
+
+#include <alloy/core.h>
+
+#include <alloy/backend/ivm/ivm_intcode.h>
+
+
+namespace alloy {
+namespace backend {
+namespace ivm {
+
+
+class IVMStack {
+public:
+  IVMStack();
+  ~IVMStack();
+
+  Register* Alloc(size_t register_count);
+  void Free(size_t register_count);
+
+private:
+  class Chunk {
+  public:
+    Chunk(size_t chunk_size);
+    ~Chunk();
+
+    Chunk*    prev;
+    Chunk*    next;
+
+    size_t    capacity;
+    uint8_t*  buffer;
+    size_t    offset;
+  };
+
+private:
+  size_t    chunk_size_;
+  Chunk*    head_chunk_;
+  Chunk*    active_chunk_;
+};
+
+
+}  // namespace ivm
+}  // namespace backend
+}  // namespace alloy
+
+
+#endif  // ALLOY_BACKEND_IVM_IVM_STACK_H_