From ca25d25d4c5131491a50b1a94e63e9b2d3c34ed4 Mon Sep 17 00:00:00 2001
From: Richard-Qin-X <richard.qin.001@gmail.com>
Date: Sun, 16 Aug 2026 16:13:12 +0800
Subject: [RISCV][GlobalISel] Select comparisons against zero

---
 .../rcc/CodeGen/GlobalISel/GIMatchTableExecutor.h  |  5 +++++
 backend/include/rcc/TableGen/Record.h              | 23 ++++++++++++++++++++++
 2 files changed, 28 insertions(+)

(limited to 'backend/include')

diff --git a/backend/include/rcc/CodeGen/GlobalISel/GIMatchTableExecutor.h b/backend/include/rcc/CodeGen/GlobalISel/GIMatchTableExecutor.h
index 807cb4a..7cceca3 100644
--- a/backend/include/rcc/CodeGen/GlobalISel/GIMatchTableExecutor.h
+++ b/backend/include/rcc/CodeGen/GlobalISel/GIMatchTableExecutor.h
@@ -27,8 +27,13 @@ enum class GIMatchTableOpcode : std::uint8_t {
   CheckOperandType,
   CheckOperandBank,
   CheckOperandClass,
+  CheckIntegerPredicate,
+  CheckOperandDefConstant,
   MutateOpcode,
+  RenderOperand,
+  RenderPhysicalRegister,
   AppendImmediate,
+  EraseOperandDefinition,
   Complete,
 };
 
diff --git a/backend/include/rcc/TableGen/Record.h b/backend/include/rcc/TableGen/Record.h
index 94308c7..4378af8 100644
--- a/backend/include/rcc/TableGen/Record.h
+++ b/backend/include/rcc/TableGen/Record.h
@@ -229,16 +229,39 @@ struct SourceSelectionOperandClassPredicate final {
   TextRange Range;
 };
 
+struct SourceSelectionIntegerPredicate final {
+  std::uint32_t OperandIndex = 0;
+  std::string Predicate;
+  TextRange Range;
+};
+
+struct SourceSelectionOperandDefConstantPredicate final {
+  std::uint32_t OperandIndex = 0;
+  std::int64_t Value = 0;
+  TextRange Range;
+};
+
+struct SourceSelectionOperandRenderer final {
+  std::optional<std::uint32_t> OperandIndex;
+  std::string PhysicalRegisterSymbol;
+  std::vector<std::string> Flags;
+  TextRange Range;
+};
+
 struct SourceSelectionRule final {
   std::string Symbol;
   std::uint32_t Priority = 0;
   std::string MatchOpcodeSymbol;
   std::optional<SourceSelectionTypePredicate> ResultType;
+  std::optional<SourceSelectionIntegerPredicate> IntegerPredicate;
   std::vector<SourceSelectionOperandTypePredicate> OperandTypes;
   std::vector<SourceSelectionOperandBankPredicate> OperandBanks;
   std::vector<SourceSelectionOperandClassPredicate> OperandClasses;
+  std::vector<SourceSelectionOperandDefConstantPredicate> OperandDefConstants;
   std::string ResultOpcodeSymbol;
+  std::optional<std::vector<SourceSelectionOperandRenderer>> OperandRenderers;
   std::vector<std::int64_t> AppendedImmediates;
+  std::vector<std::uint32_t> EraseOperandDefinitions;
   TextRange Range;
 };
 
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