================
@@ -0,0 +1,38 @@
+// RUN: %clang_cc1 -fno-rtti -triple aarch64-windows-msvc
-fdump-record-layouts -fsyntax-only %s 2>/dev/null \
+// RUN: | FileCheck %s -check-prefix CHECK-ARM64
+// RUN: %clang_cc1 -fno-rtti -triple arm64ec-windows-msvc
-fdump-record-layouts -fsyntax-only %s 2>/dev/null \
+// RUN: | FileCheck %s -check-prefix CHECK-X64
+// RUN: %clang_cc1 -fno-rtti -triple x86_64-windows-msvc -fdump-record-layouts
-fsyntax-only %s 2>/dev/null \
+// RUN: | FileCheck %s -check-prefix CHECK-X64
+
+// On Arm64 (but not Arm64EC or x64), MSVC reuses the tail padding of an
+// over-aligned base class for a subsequent base class.
+
+struct alignas(16) Type {
+ long long a, b, c;
----------------
efriedma-quic wrote:
Some potential variations to test:
- ensure this works for alignas on individual fields as well.
- ensure we insert necessary padding before an overaligned base.
https://github.com/llvm/llvm-project/pull/210461
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