From 495c675771f43cfa12ab7a426a538be72fec1805 Mon Sep 17 00:00:00 2001
From: Richard-Qin-X <richard.qin.001@gmail.com>
Date: Sun, 9 Aug 2026 17:03:19 +0800
Subject: [CodeGen] Implement machine optimization and scheduling

---
 backend/lib/CodeGen/MachineCombinerPattern.cpp | 50 ++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)
 create mode 100644 backend/lib/CodeGen/MachineCombinerPattern.cpp

(limited to 'backend/lib/CodeGen/MachineCombinerPattern.cpp')

diff --git a/backend/lib/CodeGen/MachineCombinerPattern.cpp b/backend/lib/CodeGen/MachineCombinerPattern.cpp
new file mode 100644
index 0000000..b1c3c96
--- /dev/null
+++ b/backend/lib/CodeGen/MachineCombinerPattern.cpp
@@ -0,0 +1,50 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "rcc/CodeGen/MachineCombinerPattern.h"
+
+#include <cstddef>
+#include <ranges>
+#include <string>
+#include <unordered_set>
+#include <utility>
+
+namespace rcc {
+
+Expected<TargetMachineCombinerInfo>
+TargetMachineCombinerInfo::create(std::vector<MachineCombinerPattern> Patterns) {
+  TargetMachineCombinerInfo Result(std::move(Patterns));
+  std::unordered_set<std::string> Names;
+  for (const MachineCombinerPattern &Pattern : Result.Patterns) {
+    if (Pattern.Name.empty() || !Pattern.RootOpcode.isValid() || Pattern.Stages == 0 ||
+        !Names.insert(Pattern.Name).second) {
+      return makeUnexpected(ErrorCode::InvalidArgument,
+                            "machine combiner pattern has an invalid identity or stage mask");
+    }
+    for (const MachineCombinerPredicate &Predicate : Pattern.Predicates) {
+      switch (Predicate.Kind) {
+      case MachineCombinerPredicateKind::ImmediateEquals:
+      case MachineCombinerPredicateKind::PhysicalRegisterEquals:
+      case MachineCombinerPredicateKind::RegisterIsVirtual:
+      case MachineCombinerPredicateKind::RegisterIsPhysical:
+        break;
+      case MachineCombinerPredicateKind::RegisterEquals:
+        if (Predicate.Operand == Predicate.OtherOperand) {
+          return makeUnexpected(ErrorCode::InvalidArgument,
+                                "register equality pattern compares an operand with itself");
+        }
+        break;
+      }
+    }
+    Result.MatchTable[Pattern.RootOpcode].push_back(Pattern);
+  }
+  return Result;
+}
+
+std::span<const MachineCombinerPattern>
+TargetMachineCombinerInfo::patterns(Opcode RootOpcode) const noexcept {
+  const auto Position = MatchTable.find(RootOpcode);
+  return Position == MatchTable.end() ? std::span<const MachineCombinerPattern>{}
+                                      : std::span<const MachineCombinerPattern>(Position->second);
+}
+
+} // namespace rcc
-- 
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