Index: lib/Basic/Targets/ARM.cpp
===================================================================
--- lib/Basic/Targets/ARM.cpp
+++ lib/Basic/Targets/ARM.cpp
@@ -309,8 +309,9 @@
   setAtomic();
 
   // Maximum alignment for ARM NEON data types should be 64-bits (AAPCS)
+  // as well the default alignment
   if (IsAAPCS && (Triple.getEnvironment() != llvm::Triple::Android))
-    MaxVectorAlign = 64;
+    DefaultAlignForAttributeAligned = MaxVectorAlign = 64;
 
   // Do force alignment of members that follow zero length bitfields.  If
   // the alignment of the zero-length bitfield is greater than the member
Index: test/CodeGen/ARM/exception-alignment.cpp
===================================================================
--- /dev/null
+++ test/CodeGen/ARM/exception-alignment.cpp
@@ -0,0 +1,19 @@
+// Bug: https://bugs.llvm.org/show_bug.cgi?id=42668
+// REQUIRES: arm-registered-target
+// RUN: %clang --target=arm-arm-none-eabi -march=armv8-a -S -emit-llvm -Os -o - %s | FileCheck --check-prefixes=CHECK,A8 %s
+// RUN: %clang --target=arm-linux-androideabi -march=armv8-a -S -emit-llvm -Os -o - %s | FileCheck --check-prefixes=CHECK,A16 %s
+// CHECK: [[E:%[A-z0-9]+]] = tail call i8* @__cxa_allocate_exception
+// CHECK-NEXT: [[BC:%[A-z0-9]+]] = bitcast i8* [[E]] to <2 x i64>*
+// A8-NEXT: store <2 x i64> <i64 1, i64 2>, <2 x i64>* [[BC]], align 8
+// A16-NEXT: store <2 x i64> <i64 1, i64 2>, <2 x i64>* [[BC]], align 16
+#include <arm_neon.h>
+
+int main(void) {
+  try {
+    throw vld1q_u64(((const uint64_t[2]){1, 2}));
+  } catch (uint64x2_t exc) {
+    return 0;
+  }
+  return 1;
+}
+
Index: test/SemaCXX/warn-overaligned-type-thrown.cpp
===================================================================
--- test/SemaCXX/warn-overaligned-type-thrown.cpp
+++ test/SemaCXX/warn-overaligned-type-thrown.cpp
@@ -2,11 +2,12 @@
 // RUN: %clang_cc1 -triple arm64-apple-ios10 -verify -fsyntax-only -std=c++11 -fcxx-exceptions -fexceptions -DUNDERALIGNED %s
 // RUN: %clang_cc1 -triple arm64-apple-tvos10 -verify -fsyntax-only -std=c++11 -fcxx-exceptions -fexceptions -DUNDERALIGNED %s
 // RUN: %clang_cc1 -triple arm64-apple-watchos4 -verify -fsyntax-only -std=c++11 -fcxx-exceptions -fexceptions -DUNDERALIGNED %s
+// RUN: %clang_cc1 -triple arm-linux-gnueabi -verify -fsyntax-only -std=c++11 -fcxx-exceptions -fexceptions  -DUNDERALIGNED %s
 // RUN: %clang_cc1 -triple x86_64-apple-macosx10.14 -verify -fsyntax-only -std=c++11 -fcxx-exceptions -fexceptions %s
 // RUN: %clang_cc1 -triple arm64-apple-ios12 -verify -fsyntax-only -std=c++11 -fcxx-exceptions -fexceptions %s
 // RUN: %clang_cc1 -triple arm64-apple-tvos12 -verify -fsyntax-only -std=c++11 -fcxx-exceptions -fexceptions %s
 // RUN: %clang_cc1 -triple arm64-apple-watchos5 -verify -fsyntax-only -std=c++11 -fcxx-exceptions -fexceptions %s
-// RUN: %clang_cc1 -triple arm-linux-gnueabi -verify -fsyntax-only -std=c++11 -fcxx-exceptions -fexceptions %s
+// RUN: %clang_cc1 -triple arm-linux-androideabi -verify -fsyntax-only -std=c++11 -fcxx-exceptions -fexceptions %s
 // RUN: %clang_cc1 -triple aarch64-linux-gnueabi -verify -fsyntax-only -std=c++11 -fcxx-exceptions -fexceptions %s
 // RUN: %clang_cc1 -triple mipsel-linux-gnu -verify -fsyntax-only -std=c++11 -fcxx-exceptions -fexceptions %s
 // RUN: %clang_cc1 -triple mips64el-linux-gnu -verify -fsyntax-only -std=c++11 -fcxx-exceptions -fexceptions %s