[llvm] Replace `UndefValue::get` with `PoisonValue::get` in unit test (PR #115985)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-analysis

Author: Lee Wei (leewei05)

<details>
<summary>Changes</summary>

Since these `UndefValue::get` are acted as placeholders, I think it's safe to replace them with poison values.
There are a lot of `UndefValue::get` in LLVM, I'll start fixing the ones in `unittests` while fixing the regression tests.

@<!-- -->nunoplopes @<!-- -->regehr 

---
Full diff: https://github.com/llvm/llvm-project/pull/115985.diff


1 Files Affected:

- (modified) llvm/unittests/Analysis/PhiValuesTest.cpp (+11-11) 


``````````diff
diff --git a/llvm/unittests/Analysis/PhiValuesTest.cpp b/llvm/unittests/Analysis/PhiValuesTest.cpp
index 149feb15d999f1..1cd8c96b33c6eb 100644
--- a/llvm/unittests/Analysis/PhiValuesTest.cpp
+++ b/llvm/unittests/Analysis/PhiValuesTest.cpp
@@ -34,14 +34,14 @@ TEST(PhiValuesTest, SimplePhi) {
   BasicBlock *If = BasicBlock::Create(C, "if", F);
   BasicBlock *Else = BasicBlock::Create(C, "else", F);
   BasicBlock *Then = BasicBlock::Create(C, "then", F);
-  BranchInst::Create(If, Else, UndefValue::get(I1Ty), Entry);
+  BranchInst::Create(If, Else, PoisonValue::get(I1Ty), Entry);
   BranchInst::Create(Then, If);
   BranchInst::Create(Then, Else);
 
-  Value *Val1 = new LoadInst(I32Ty, UndefValue::get(PtrTy), "val1", Entry);
-  Value *Val2 = new LoadInst(I32Ty, UndefValue::get(PtrTy), "val2", Entry);
-  Value *Val3 = new LoadInst(I32Ty, UndefValue::get(PtrTy), "val3", Entry);
-  Value *Val4 = new LoadInst(I32Ty, UndefValue::get(PtrTy), "val4", Entry);
+  Value *Val1 = new LoadInst(I32Ty, PoisonValue::get(PtrTy), "val1", Entry);
+  Value *Val2 = new LoadInst(I32Ty, PoisonValue::get(PtrTy), "val2", Entry);
+  Value *Val3 = new LoadInst(I32Ty, PoisonValue::get(PtrTy), "val3", Entry);
+  Value *Val4 = new LoadInst(I32Ty, PoisonValue::get(PtrTy), "val4", Entry);
 
   PHINode *Phi1 = PHINode::Create(I32Ty, 2, "phi1", Then);
   Phi1->addIncoming(Val1, If);
@@ -104,17 +104,17 @@ TEST(PhiValuesTest, DependentPhi) {
   BasicBlock *If2 = BasicBlock::Create(C, "if2", F);
   BasicBlock *Else2 = BasicBlock::Create(C, "else2", F);
   BasicBlock *End = BasicBlock::Create(C, "then", F);
-  BranchInst::Create(If1, Else1, UndefValue::get(I1Ty), Entry);
+  BranchInst::Create(If1, Else1, PoisonValue::get(I1Ty), Entry);
   BranchInst::Create(Then, If1);
   BranchInst::Create(Then, Else1);
-  BranchInst::Create(If2, Else2, UndefValue::get(I1Ty), Then);
+  BranchInst::Create(If2, Else2, PoisonValue::get(I1Ty), Then);
   BranchInst::Create(End, If2);
   BranchInst::Create(End, Else2);
 
-  Value *Val1 = new LoadInst(I32Ty, UndefValue::get(PtrTy), "val1", Entry);
-  Value *Val2 = new LoadInst(I32Ty, UndefValue::get(PtrTy), "val2", Entry);
-  Value *Val3 = new LoadInst(I32Ty, UndefValue::get(PtrTy), "val3", Entry);
-  Value *Val4 = new LoadInst(I32Ty, UndefValue::get(PtrTy), "val4", Entry);
+  Value *Val1 = new LoadInst(I32Ty, PoisonValue::get(PtrTy), "val1", Entry);
+  Value *Val2 = new LoadInst(I32Ty, PoisonValue::get(PtrTy), "val2", Entry);
+  Value *Val3 = new LoadInst(I32Ty, PoisonValue::get(PtrTy), "val3", Entry);
+  Value *Val4 = new LoadInst(I32Ty, PoisonValue::get(PtrTy), "val4", Entry);
 
   PHINode *Phi1 = PHINode::Create(I32Ty, 2, "phi1", Then);
   Phi1->addIncoming(Val1, If1);

``````````

</details>


https://github.com/llvm/llvm-project/pull/115985