[clang] [clang][bytecode]Fix-constant-eval-complex-discard (PR #177731)

[via cfe-commits]

https://github.com/FYLGQ updated https://github.com/llvm/llvm-project/pull/177731

>From 128f0bf6edc86c0f1c1fd279466afccc95e1ebfc Mon Sep 17 00:00:00 2001
From: FYLGQ <799648409 at qq.com>
Date: Sat, 24 Jan 2026 10:58:51 +0800
Subject: [PATCH 1/2] fix-constant-eval-complex-discard

---
 clang/lib/AST/ByteCode/Compiler.cpp                    | 3 ++-
 clang/lib/AST/ByteCode/constant-eval-complex-discard.c | 6 ++++++
 2 files changed, 8 insertions(+), 1 deletion(-)
 create mode 100644 clang/lib/AST/ByteCode/constant-eval-complex-discard.c

diff --git a/clang/lib/AST/ByteCode/Compiler.cpp b/clang/lib/AST/ByteCode/Compiler.cpp
index 272d08f5e455c..d864fdc5d7e6d 100644
--- a/clang/lib/AST/ByteCode/Compiler.cpp
+++ b/clang/lib/AST/ByteCode/Compiler.cpp
@@ -7406,7 +7406,8 @@ bool Compiler<Emitter>::emitComplexComparison(const Expr *LHS, const Expr *RHS,
                                               const BinaryOperator *E) {
   assert(E->isComparisonOp());
   assert(!Initializing);
-  assert(!DiscardResult);
+  if (DiscardResult)
+    return true;
 
   PrimType ElemT;
   bool LHSIsComplex;
diff --git a/clang/lib/AST/ByteCode/constant-eval-complex-discard.c b/clang/lib/AST/ByteCode/constant-eval-complex-discard.c
new file mode 100644
index 0000000000000..1d111fc049cc1
--- /dev/null
+++ b/clang/lib/AST/ByteCode/constant-eval-complex-discard.c
@@ -0,0 +1,6 @@
+// RUN: %clang_cc1 -std=c11 -fsyntax-only -fexperimental-new-constant-interpreter %s
+
+void foo(void) {
+  // Complex comparison evaluated in a discarded context.
+  (void)(0 && (1i == 1i));
+}

>From b71ec175022ef25291c4bffb5bea65748730c430 Mon Sep 17 00:00:00 2001
From: FYLGQ <799648409 at qq.com>
Date: Sat, 24 Jan 2026 12:36:01 +0800
Subject: [PATCH 2/2] Move test file constant-eval-complex-discard.c to
 clang/test/AST/ByteCode

---
 clang/{lib => test}/AST/ByteCode/constant-eval-complex-discard.c | 0
 1 file changed, 0 insertions(+), 0 deletions(-)
 rename clang/{lib => test}/AST/ByteCode/constant-eval-complex-discard.c (100%)

diff --git a/clang/lib/AST/ByteCode/constant-eval-complex-discard.c b/clang/test/AST/ByteCode/constant-eval-complex-discard.c
similarity index 100%
rename from clang/lib/AST/ByteCode/constant-eval-complex-discard.c
rename to clang/test/AST/ByteCode/constant-eval-complex-discard.c