[clang] 6eb32a2 - [clang] Change placeholder from `undef` to `poison` (#131533)

[via cfe-commits]

Author: Pedro Lobo
Date: 2025-03-17T10:49:18Z
New Revision: 6eb32a2fa0d16bea03f22dd2078f53da6d9352cd

URL: https://github.com/llvm/llvm-project/commit/6eb32a2fa0d16bea03f22dd2078f53da6d9352cd
DIFF: https://github.com/llvm/llvm-project/commit/6eb32a2fa0d16bea03f22dd2078f53da6d9352cd.diff

LOG: [clang] Change placeholder from `undef` to `poison` (#131533)

Return a `poison` value, instead of `undef`, if there is no available
SEH info.

Added: 
    

Modified: 
    clang/lib/CodeGen/CGException.cpp

Removed: 
    


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diff  --git a/clang/lib/CodeGen/CGException.cpp b/clang/lib/CodeGen/CGException.cpp
index 5a395c924333e..b4b8c2952b02b 100644
--- a/clang/lib/CodeGen/CGException.cpp
+++ b/clang/lib/CodeGen/CGException.cpp
@@ -2145,7 +2145,7 @@ llvm::Value *CodeGenFunction::EmitSEHExceptionInfo() {
   // Sema should diagnose calling this builtin outside of a filter context, but
   // don't crash if we screw up.
   if (!SEHInfo)
-    return llvm::UndefValue::get(Int8PtrTy);
+    return llvm::PoisonValue::get(Int8PtrTy);
   assert(SEHInfo->getType() == Int8PtrTy);
   return SEHInfo;
 }