From b7716aba458fb3d49742f7a3c169deee7345396e Mon Sep 17 00:00:00 2001
From: Richard-Qin-X <richard.qin.001@gmail.com>
Date: Tue, 11 Aug 2026 19:36:06 +0800
Subject: [RISCV] Honor invocation subtarget features

---
 backend/include/rcc/Target/RISCV/RISCVSubtarget.h | 47 +++++++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 backend/include/rcc/Target/RISCV/RISCVSubtarget.h

(limited to 'backend/include/rcc/Target/RISCV/RISCVSubtarget.h')

diff --git a/backend/include/rcc/Target/RISCV/RISCVSubtarget.h b/backend/include/rcc/Target/RISCV/RISCVSubtarget.h
new file mode 100644
index 0000000..d5f088f
--- /dev/null
+++ b/backend/include/rcc/Target/RISCV/RISCVSubtarget.h
@@ -0,0 +1,47 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef RCC_TARGET_RISCV_RISCVSUBTARGET_H
+#define RCC_TARGET_RISCV_RISCVSUBTARGET_H
+
+#include "rcc/Support/Error.h"
+
+#include <cstdint>
+#include <span>
+#include <string>
+
+namespace rcc::riscv {
+
+enum class RISCVExtension : std::uint8_t {
+  I,
+  M,
+  A,
+  F,
+  D,
+  C,
+  Zicsr,
+  Zifencei,
+  Zacas,
+  Zabha,
+  Count,
+};
+
+class RISCVSubtargetFeatures final {
+public:
+  [[nodiscard]] static Expected<RISCVSubtargetFeatures>
+  fromFeatureList(std::span<const std::string> Features);
+  [[nodiscard]] static RISCVSubtargetFeatures rv64gc() noexcept;
+
+  [[nodiscard]] bool has(RISCVExtension Extension) const noexcept;
+
+  friend bool operator==(const RISCVSubtargetFeatures &Left,
+                         const RISCVSubtargetFeatures &Right) = default;
+
+private:
+  explicit constexpr RISCVSubtargetFeatures(std::uint16_t Enabled) noexcept : Enabled(Enabled) {}
+
+  std::uint16_t Enabled = 0;
+};
+
+} // namespace rcc::riscv
+
+#endif // RCC_TARGET_RISCV_RISCVSUBTARGET_H
-- 
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