From 8a4bb6e3b0bffa0ed79b51347b12ee4293b622a7 Mon Sep 17 00:00:00 2001
From: Richard-Qin-X <richard.qin.001@gmail.com>
Date: Sat, 22 Aug 2026 18:49:08 +0800
Subject: [CodeGen] Generate RISC-V macro fusion rules

---
 backend/include/rcc/TableGen/Record.h | 47 +++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)

(limited to 'backend/include/rcc/TableGen')

diff --git a/backend/include/rcc/TableGen/Record.h b/backend/include/rcc/TableGen/Record.h
index 9f3477f..9ebfb7f 100644
--- a/backend/include/rcc/TableGen/Record.h
+++ b/backend/include/rcc/TableGen/Record.h
@@ -143,6 +143,52 @@ struct SourceSchedulingClass final {
   TextRange Range;
 };
 
+struct SourceMacroFusionOpcodePair final {
+  std::string FirstOpcodeSymbol;
+  std::string SecondOpcodeSymbol;
+  TextRange Range;
+};
+
+struct SourceMacroFusionImmediatePredicate final {
+  std::string Instruction;
+  std::uint32_t OperandIndex = 0;
+  std::int64_t Minimum = 0;
+  std::int64_t Maximum = 0;
+  TextRange Range;
+};
+
+struct SourceMacroFusionRegisterInequality final {
+  std::string Instruction;
+  std::uint32_t LeftOperand = 0;
+  std::uint32_t RightOperand = 0;
+  TextRange Range;
+};
+
+struct SourceMacroFusionImmediateRelation final {
+  std::string Kind;
+  std::uint32_t FirstOperand = 0;
+  std::uint32_t SecondOperand = 0;
+  TextRange Range;
+};
+
+struct SourceMacroFusionRule final {
+  std::string Symbol;
+  std::string Feature;
+  std::vector<std::string> FirstOpcodeSymbols;
+  std::vector<std::string> SecondOpcodeSymbols;
+  std::vector<SourceMacroFusionOpcodePair> OpcodePairs;
+  std::vector<SourceMacroFusionImmediatePredicate> ImmediatePredicates;
+  std::vector<SourceMacroFusionRegisterInequality> RegisterInequalities;
+  std::vector<SourceMacroFusionImmediateRelation> ImmediateRelations;
+  std::uint32_t FirstDefinitionOperand = 0;
+  std::uint32_t SecondUseOperand = 0;
+  std::uint32_t SecondDefinitionOperand = 0;
+  std::optional<std::uint32_t> CommutableSecondUseOperand;
+  bool RequireSingleNonDebugUse = false;
+  bool RequireSecondDestinationTie = false;
+  TextRange Range;
+};
+
 struct SourceEncodingCategory final {
   std::uint32_t ID = 0;
   std::string Symbol;
@@ -394,6 +440,7 @@ struct DescriptionAST final {
   std::vector<SourceInstruction> Instructions;
   std::vector<SourceSelectionRule> SelectionRules;
   std::vector<SourceCombinerRule> CombinerRules;
+  std::vector<SourceMacroFusionRule> MacroFusionRules;
 };
 
 [[nodiscard]] std::string lowerASCII(std::string_view Value);
-- 
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