[clang] [clang][bytecode] Check CarrayOutPtr in subcl more thorougly (PR #203172)

[Timm Baeder via cfe-commits]

https://github.com/tbaederr created https://github.com/llvm/llvm-project/pull/203172

Use the local `isReadable` check.

>From a008a0c2c5823625ad9f54dc1b52ca265924f1b3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Timm=20B=C3=A4der?= <tbaeder at redhat.com>
Date: Thu, 11 Jun 2026 07:05:01 +0200
Subject: [PATCH] [clang][bytecode] Check CarrayOutPtr in subcl more thorougly

Use the local `isReadable` check.
---
 clang/lib/AST/ByteCode/InterpBuiltin.cpp | 2 +-
 clang/test/AST/ByteCode/builtins.c       | 4 ++++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/clang/lib/AST/ByteCode/InterpBuiltin.cpp b/clang/lib/AST/ByteCode/InterpBuiltin.cpp
index 08fc8252d0708..4326142aba81f 100644
--- a/clang/lib/AST/ByteCode/InterpBuiltin.cpp
+++ b/clang/lib/AST/ByteCode/InterpBuiltin.cpp
@@ -984,7 +984,7 @@ static bool interp__builtin_carryop(InterpState &S, CodePtr OpPC,
   if (!popToAPSInt(S.Stk, LHST, LHS))
     return false;
 
-  if (CarryOutPtr.isDummy() || !CarryOutPtr.isBlockPointer())
+  if (!isReadable(CarryOutPtr))
     return false;
 
   APSInt CarryOut;
diff --git a/clang/test/AST/ByteCode/builtins.c b/clang/test/AST/ByteCode/builtins.c
index dc19d197d0a2e..8af1c5cc90616 100644
--- a/clang/test/AST/ByteCode/builtins.c
+++ b/clang/test/AST/ByteCode/builtins.c
@@ -37,3 +37,7 @@ const int compared = strcmp(_str, (const char *)_str2); // both-error {{initiali
 
 int ptrint = __builtin_bswap64("") == 0x1234 ? 1 : 0; // both-error {{incompatible pointer to integer conversion}} \
                                                       // both-error {{initializer element is not a compile-time constant}}
+
+void subclNonReadable() {
+  if(__builtin_subcl(0, 0, 0, &(*({ struct {} x; &x; }))) != 0) {} // both-error {{incompatible pointer types}}
+}