From f5c592905e6e1ef4b78337d76c8215e543607b8d Mon Sep 17 00:00:00 2001
From: Richard-Qin-X <richard.qin.001@gmail.com>
Date: Mon, 17 Aug 2026 03:16:26 +0800
Subject: [RISCV][GlobalISel] Generate conditional branch selection

---
 backend/utils/TableGen/Common/CodeGenSelection.cpp | 17 ++++++++++++++++-
 backend/utils/TableGen/Common/CodeGenTarget.h      |  1 +
 2 files changed, 17 insertions(+), 1 deletion(-)

(limited to 'backend/utils/TableGen/Common')

diff --git a/backend/utils/TableGen/Common/CodeGenSelection.cpp b/backend/utils/TableGen/Common/CodeGenSelection.cpp
index 95a924f..df9bf7b 100644
--- a/backend/utils/TableGen/Common/CodeGenSelection.cpp
+++ b/backend/utils/TableGen/Common/CodeGenSelection.cpp
@@ -355,9 +355,22 @@ bool CodeGenTarget::normalizeSelectionRules(NormalizedTargetModel &Result) {
       NormalizedSelectionDefUsePredicate NormalizedPredicate{
           .RootOperandIndex = Predicate.RootOperandIndex,
           .Opcode = *DefOpcode,
+          .IntegerPredicate = std::nullopt,
           .Captures = {},
           .OperandDefConstants = {},
       };
+      if (Predicate.IntegerPredicate) {
+        const auto Integer = integerPredicateValue(Predicate.IntegerPredicate->Predicate);
+        if (!Integer) {
+          fail(Predicate.IntegerPredicate->Range,
+               "selection def-use integer predicate is not a recognized integer predicate");
+          return false;
+        }
+        NormalizedPredicate.IntegerPredicate = {
+            .OperandIndex = Predicate.IntegerPredicate->OperandIndex,
+            .Predicate = *Integer,
+        };
+      }
       std::unordered_set<std::uint32_t> CapturedOperands;
       for (const SourceSelectionDefUseCapture &Capture : Predicate.Captures) {
         if (!isIdentifier(Capture.Symbol) ||
@@ -390,7 +403,9 @@ bool CodeGenTarget::normalizeSelectionRules(NormalizedTargetModel &Result) {
         });
       }
       Normalized.DefUsePredicates.push_back(std::move(NormalizedPredicate));
-      Normalized.Specificity += 1U + static_cast<std::uint32_t>(Predicate.Captures.size()) +
+      Normalized.Specificity += 1U +
+                                static_cast<std::uint32_t>(Predicate.IntegerPredicate.has_value()) +
+                                static_cast<std::uint32_t>(Predicate.Captures.size()) +
                                 static_cast<std::uint32_t>(Predicate.OperandDefConstants.size());
     }
 
diff --git a/backend/utils/TableGen/Common/CodeGenTarget.h b/backend/utils/TableGen/Common/CodeGenTarget.h
index d66cfee..97e1447 100644
--- a/backend/utils/TableGen/Common/CodeGenTarget.h
+++ b/backend/utils/TableGen/Common/CodeGenTarget.h
@@ -217,6 +217,7 @@ struct NormalizedSelectionDefUseCapture final {
 struct NormalizedSelectionDefUsePredicate final {
   std::uint32_t RootOperandIndex = 0;
   std::uint32_t Opcode = 0;
+  std::optional<NormalizedSelectionIntegerPredicate> IntegerPredicate;
   std::vector<NormalizedSelectionDefUseCapture> Captures;
   std::vector<NormalizedSelectionOperandDefConstantPredicate> OperandDefConstants;
 };
-- 
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