From e2505772ab260c79d0075728082c907a90dab7ca Mon Sep 17 00:00:00 2001
From: Richard-Qin-X <richard.qin.001@gmail.com>
Date: Sat, 1 Aug 2026 05:01:57 +0800
Subject: [CodeGen] Add machine IR value semantics

Add strongly typed machine indices, lane masks, instruction flags, fixed-point branch probabilities, and preserved-register masks.

Model immutable machine memory operands with explicit base identity, size, alignment, address space, alias information, and validated atomic operation and ordering rules. Cover normal, boundary, and invalid combinations in standalone tests.
---
 backend/include/rcc/CodeGen/RegisterMask.h | 39 ++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)
 create mode 100644 backend/include/rcc/CodeGen/RegisterMask.h

(limited to 'backend/include/rcc/CodeGen/RegisterMask.h')

diff --git a/backend/include/rcc/CodeGen/RegisterMask.h b/backend/include/rcc/CodeGen/RegisterMask.h
new file mode 100644
index 0000000..d5a5b71
--- /dev/null
+++ b/backend/include/rcc/CodeGen/RegisterMask.h
@@ -0,0 +1,39 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef RCC_CODEGEN_REGISTERMASK_H
+#define RCC_CODEGEN_REGISTERMASK_H
+
+#include "rcc/CodeGen/Register.h"
+
+#include <cstddef>
+#include <cstdint>
+#include <span>
+#include <utility>
+#include <vector>
+
+namespace rcc {
+
+class RegisterMask final {
+public:
+  explicit RegisterMask(std::vector<std::uint64_t> PreservedWords)
+      : PreservedWords(std::move(PreservedWords)) {}
+
+  [[nodiscard]] bool preserves(PhysicalRegister PhysReg) const noexcept;
+
+  [[nodiscard]] bool clobbers(PhysicalRegister PhysReg) const noexcept {
+    return !preserves(PhysReg);
+  }
+
+  [[nodiscard]] std::span<const std::uint64_t> words() const noexcept {
+    return PreservedWords;
+  }
+
+  friend bool operator==(const RegisterMask &Left, const RegisterMask &Right) = default;
+
+private:
+  std::vector<std::uint64_t> PreservedWords;
+};
+
+} // namespace rcc
+
+#endif // RCC_CODEGEN_REGISTERMASK_H
-- 
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