[clang] [Metadata] Change placeholder from `undef` to `poison` (PR #131469)

[Pedro Lobo via cfe-commits]

https://github.com/pedroclobo created 
https://github.com/llvm/llvm-project/pull/131469
Replace `undef` constant metadata uses with `poison`.

>From 7df6eb58c29f35eef3845c3ba5f76edb902272f4 Mon Sep 17 00:00:00 2001
From: Pedro Lobo <pedro.l...@tecnico.ulisboa.pt>
Date: Sat, 15 Mar 2025 20:10:34 +0000
Subject: [PATCH] [Metadata] Change placeholder from `undef` to `poison`

Replace `undef` constant metadata uses with `poison`.
---
 clang/lib/CodeGen/CodeGenFunction.cpp         | 2 +-
 clang/test/CodeGenCUDASPIRV/spirv-attrs.cu    | 2 +-
 clang/test/CodeGenOpenCL/kernel-attributes.cl | 4 ++--
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/clang/lib/CodeGen/CodeGenFunction.cpp 
b/clang/lib/CodeGen/CodeGenFunction.cpp
index 447192bc7f60c..a7fdfa6273dd4 100644
--- a/clang/lib/CodeGen/CodeGenFunction.cpp
+++ b/clang/lib/CodeGen/CodeGenFunction.cpp
@@ -640,7 +640,7 @@ void CodeGenFunction::EmitKernelMetadata(const FunctionDecl 
*FD,
         HintQTy->isSignedIntegerType() ||
         (HintEltQTy && HintEltQTy->getElementType()->isSignedIntegerType());
     llvm::Metadata *AttrMDArgs[] = {
-        llvm::ConstantAsMetadata::get(llvm::UndefValue::get(
+        llvm::ConstantAsMetadata::get(llvm::PoisonValue::get(
             CGM.getTypes().ConvertType(A->getTypeHint()))),
         llvm::ConstantAsMetadata::get(llvm::ConstantInt::get(
             llvm::IntegerType::get(Context, 32),
diff --git a/clang/test/CodeGenCUDASPIRV/spirv-attrs.cu 
b/clang/test/CodeGenCUDASPIRV/spirv-attrs.cu
index 466aee00717a0..30989e3e9a86a 100644
--- a/clang/test/CodeGenCUDASPIRV/spirv-attrs.cu
+++ b/clang/test/CodeGenCUDASPIRV/spirv-attrs.cu
@@ -24,5 +24,5 @@ __global__ void intel_reqd_sub_group_size_64() {}
 
 // CHECK: ![[WG_SIZE]] = !{i32 128, i32 1, i32 1}
 // CHECK: ![[WG_HINT]] = !{i32 2, i32 2, i32 2}
-// CHECK: ![[VEC_HINT]] = !{i32 undef, i32 1}
+// CHECK: ![[VEC_HINT]] = !{i32 poison, i32 1}
 // CHECK: ![[SUB_GRP]] = !{i32 64}
diff --git a/clang/test/CodeGenOpenCL/kernel-attributes.cl 
b/clang/test/CodeGenOpenCL/kernel-attributes.cl
index c9ecb144c9f36..3625138f96330 100644
--- a/clang/test/CodeGenOpenCL/kernel-attributes.cl
+++ b/clang/test/CodeGenOpenCL/kernel-attributes.cl
@@ -11,8 +11,8 @@ kernel __attribute__((vec_type_hint(uint4))) 
__attribute__((work_group_size_hint
 kernel __attribute__((intel_reqd_sub_group_size(8))) void kernel3(int a) {}
 // CHECK: define {{(dso_local )?}}spir_kernel void @kernel3(i32 {{[^%]*}}%a) 
{{[^{]+}} !intel_reqd_sub_group_size ![[MD5:[0-9]+]]
 
-// CHECK: [[MD1]] = !{i32 undef, i32 1}
+// CHECK: [[MD1]] = !{i32 poison, i32 1}
 // CHECK: [[MD2]] = !{i32 1, i32 2, i32 4}
-// CHECK: [[MD3]] = !{<4 x i32> undef, i32 0}
+// CHECK: [[MD3]] = !{<4 x i32> poison, i32 0}
 // CHECK: [[MD4]] = !{i32 8, i32 16, i32 32}
 // CHECK: [[MD5]] = !{i32 8}

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