[clang][bytecode] Reject memcpy sizes with element size remainder (#119209)

1 files changed, 10 insertions, 0 deletions

diff --git a/clang/test/AST/ByteCode/builtin-functions.cpp b/clang/test/AST/ByteCode/builtin-functions.cpp
index bd453d6..a67b6b6 100644
--- a/clang/test/AST/ByteCode/builtin-functions.cpp
+++ b/clang/test/AST/ByteCode/builtin-functions.cpp
@@ -1197,4 +1197,14 @@ namespace BuiltinMemcpy {
     return b;
   }
   static_assert(simpleMove() == 12);
+
+  constexpr int memcpyTypeRem() { // ref-error {{never produces a constant expression}}
+    int a = 12;
+    int b = 0;
+    __builtin_memmove(&b, &a, 1); // both-note {{'memmove' not supported: size to copy (1) is not a multiple of size of element type 'int'}} \
+                                  // ref-note {{not supported}}
+    return b;
+  }
+  static_assert(memcpyTypeRem() == 12); // both-error {{not an integral constant expression}} \
+                                        // both-note {{in call to}}
 }