[llvm] [IR] Make UnaryInstruction::classof recognize FreezeInst. (PR #107944)

[Jorge Gorbe Moya via llvm-commits]

https://github.com/slackito created https://github.com/llvm/llvm-project/pull/107944

None

>From 93dfac98c544be97b0c2101a6768fc3fb54e2c5c Mon Sep 17 00:00:00 2001
From: Jorge Gorbe Moya <jgorbe at google.com>
Date: Mon, 9 Sep 2024 17:59:08 -0700
Subject: [PATCH] [IR] Make UnaryInstruction::classof recognize FreezeInst.

---
 llvm/include/llvm/IR/InstrTypes.h      |  1 +
 llvm/unittests/IR/InstructionsTest.cpp | 14 ++++++++++++++
 2 files changed, 15 insertions(+)

diff --git a/llvm/include/llvm/IR/InstrTypes.h b/llvm/include/llvm/IR/InstrTypes.h
index 6fddedd86e97b8..4cbf0d2106eeb6 100644
--- a/llvm/include/llvm/IR/InstrTypes.h
+++ b/llvm/include/llvm/IR/InstrTypes.h
@@ -85,6 +85,7 @@ class UnaryInstruction : public Instruction {
            I->getOpcode() == Instruction::Load ||
            I->getOpcode() == Instruction::VAArg ||
            I->getOpcode() == Instruction::ExtractValue ||
+           I->getOpcode() == Instruction::Freeze ||
            (I->getOpcode() >= CastOpsBegin && I->getOpcode() < CastOpsEnd);
   }
   static bool classof(const Value *V) {
diff --git a/llvm/unittests/IR/InstructionsTest.cpp b/llvm/unittests/IR/InstructionsTest.cpp
index 529edc88ebc331..97a5c0a39800b8 100644
--- a/llvm/unittests/IR/InstructionsTest.cpp
+++ b/llvm/unittests/IR/InstructionsTest.cpp
@@ -1733,6 +1733,20 @@ TEST(InstructionsTest, BranchWeightOverflow) {
   ASSERT_EQ(ProfWeight, UINT32_MAX);
 }
 
+TEST(InstructionsTest, FreezeInst) {
+  LLVMContext C;
+  std::unique_ptr<Module> M = parseIR(C,
+                                      R"(
+      define void @foo(i8 %arg) {
+        freeze i8 %arg
+        ret void
+  }
+  )");
+  ASSERT_TRUE(M);
+  Value *FI = &M->getFunction("foo")->getEntryBlock().front();
+  EXPECT_TRUE(isa<UnaryInstruction>(FI));
+}
+
 TEST(InstructionsTest, AllocaInst) {
   LLVMContext Ctx;
   std::unique_ptr<Module> M = parseIR(Ctx, R"(