llvmorg-github-actions[bot] wrote:

<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Timm Baeder (tbaederr)

<details>
<summary>Changes</summary>

If they are checked.

---
Full diff: https://github.com/llvm/llvm-project/pull/200723.diff


2 Files Affected:

- (modified) clang/lib/AST/ByteCode/Compiler.cpp (+2) 
- (modified) clang/test/AST/ByteCode/cxx23.cpp (+4) 


``````````diff
diff --git a/clang/lib/AST/ByteCode/Compiler.cpp 
b/clang/lib/AST/ByteCode/Compiler.cpp
index 774a853950837..322c1f827223b 100644
--- a/clang/lib/AST/ByteCode/Compiler.cpp
+++ b/clang/lib/AST/ByteCode/Compiler.cpp
@@ -3570,6 +3570,8 @@ bool Compiler<Emitter>::VisitCXXDynamicCastExpr(const 
CXXDynamicCastExpr *E) {
   if (!this->emitCheckDynamicCast(E))
     return false;
 
+  if (DiscardResult)
+    return this->emitPopPtr(E);
   return true;
 }
 
diff --git a/clang/test/AST/ByteCode/cxx23.cpp 
b/clang/test/AST/ByteCode/cxx23.cpp
index 7b2d1c6e7e1e1..4619023af83e6 100644
--- a/clang/test/AST/ByteCode/cxx23.cpp
+++ b/clang/test/AST/ByteCode/cxx23.cpp
@@ -641,4 +641,8 @@ namespace DynamicCast {
                                                   // all23-note {{dynamic_cast 
applied to object 'a' whose dynamic type is not constant}} \
                                                   // all20-note {{function 
parameter 'a' with unknown value cannot be used in a constant expression}}
   }
+
+  struct S {};
+  constexpr S s;
+  constexpr int foo = (dynamic_cast<const S &>(s), 0);
 }

``````````

</details>


https://github.com/llvm/llvm-project/pull/200723
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