[clang] [clang][bytecode] Fix discarded builtin_complex (PR #180539)

[Timm Baeder via cfe-commits]

https://github.com/tbaederr created https://github.com/llvm/llvm-project/pull/180539

This is the only builtin that returns a non-primitive type I think.

>From 649e98054b9af191e8037eddd4f9a94f4c011138 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Timm=20B=C3=A4der?= <tbaeder at redhat.com>
Date: Mon, 9 Feb 2026 16:15:56 +0100
Subject: [PATCH] [clang][bytecode] Fix discarded builtin_complex

This is the only builtin that returns a non-primitive type I think.
---
 clang/lib/AST/ByteCode/Compiler.cpp | 6 ++----
 clang/test/AST/ByteCode/complex.cpp | 2 ++
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/clang/lib/AST/ByteCode/Compiler.cpp b/clang/lib/AST/ByteCode/Compiler.cpp
index a0138c402e143..b981cd3c7090d 100644
--- a/clang/lib/AST/ByteCode/Compiler.cpp
+++ b/clang/lib/AST/ByteCode/Compiler.cpp
@@ -5212,10 +5212,8 @@ bool Compiler<Emitter>::VisitBuiltinCallExpr(const CallExpr *E,
   if (!this->emitCallBI(E, BuiltinID, E))
     return false;
 
-  if (DiscardResult && !ReturnType->isVoidType()) {
-    assert(ReturnT);
-    return this->emitPop(*ReturnT, E);
-  }
+  if (DiscardResult && !ReturnType->isVoidType())
+    return this->emitPop(ReturnT.value_or(PT_Ptr), E);
 
   return true;
 }
diff --git a/clang/test/AST/ByteCode/complex.cpp b/clang/test/AST/ByteCode/complex.cpp
index 68a8e78d5b25b..4440f201bb059 100644
--- a/clang/test/AST/ByteCode/complex.cpp
+++ b/clang/test/AST/ByteCode/complex.cpp
@@ -319,6 +319,8 @@ namespace Builtin {
 
 
   constexpr _Complex float C = __builtin_complex(10.0f, 20.0); // both-error {{arguments are of different types}}
+
+  constexpr int Discarded = (__builtin_complex(1., 2.), 12);
 }
 
 namespace Cmp {