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diff --git a/src/google/protobuf/stubs/atomicops_internals_arm64_gcc.h b/src/google/protobuf/stubs/atomicops_internals_arm64_gcc.h
deleted file mode 100644
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--- a/src/google/protobuf/stubs/atomicops_internals_arm64_gcc.h
+++ /dev/null
@@ -1,325 +0,0 @@
-// Protocol Buffers - Google's data interchange format
-// Copyright 2012 Google Inc. All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-// * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-// * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-// * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// This file is an internal atomic implementation, use atomicops.h instead.
-
-#ifndef GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_ARM64_GCC_H_
-#define GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_ARM64_GCC_H_
-
-namespace google {
-namespace protobuf {
-namespace internal {
-
-inline void MemoryBarrierInternal() {
- __asm__ __volatile__ ("dmb ish" ::: "memory"); // NOLINT
-}
-
-// NoBarrier versions of the operation include "memory" in the clobber list.
-// This is not required for direct usage of the NoBarrier versions of the
-// operations. However this is required for correctness when they are used as
-// part of the Acquire or Release versions, to ensure that nothing from outside
-// the call is reordered between the operation and the memory barrier. This does
-// not change the code generated, so has no or minimal impact on the
-// NoBarrier operations.
-
-inline Atomic32 NoBarrier_CompareAndSwap(volatile Atomic32* ptr,
- Atomic32 old_value,
- Atomic32 new_value) {
- Atomic32 prev;
- int32_t temp;
-
- __asm__ __volatile__ ( // NOLINT
- "0: \n\t"
- "ldxr %w[prev], %[ptr] \n\t" // Load the previous value.
- "cmp %w[prev], %w[old_value] \n\t"
- "bne 1f \n\t"
- "stxr %w[temp], %w[new_value], %[ptr] \n\t" // Try to store the new value.
- "cbnz %w[temp], 0b \n\t" // Retry if it did not work.
- "1: \n\t"
- : [prev]"=&r" (prev),
- [temp]"=&r" (temp),
- [ptr]"+Q" (*ptr)
- : [old_value]"IJr" (old_value),
- [new_value]"r" (new_value)
- : "cc", "memory"
- ); // NOLINT
-
- return prev;
-}
-
-inline Atomic32 NoBarrier_AtomicExchange(volatile Atomic32* ptr,
- Atomic32 new_value) {
- Atomic32 result;
- int32_t temp;
-
- __asm__ __volatile__ ( // NOLINT
- "0: \n\t"
- "ldxr %w[result], %[ptr] \n\t" // Load the previous value.
- "stxr %w[temp], %w[new_value], %[ptr] \n\t" // Try to store the new value.
- "cbnz %w[temp], 0b \n\t" // Retry if it did not work.
- : [result]"=&r" (result),
- [temp]"=&r" (temp),
- [ptr]"+Q" (*ptr)
- : [new_value]"r" (new_value)
- : "memory"
- ); // NOLINT
-
- return result;
-}
-
-inline Atomic32 NoBarrier_AtomicIncrement(volatile Atomic32* ptr,
- Atomic32 increment) {
- Atomic32 result;
- int32_t temp;
-
- __asm__ __volatile__ ( // NOLINT
- "0: \n\t"
- "ldxr %w[result], %[ptr] \n\t" // Load the previous value.
- "add %w[result], %w[result], %w[increment]\n\t"
- "stxr %w[temp], %w[result], %[ptr] \n\t" // Try to store the result.
- "cbnz %w[temp], 0b \n\t" // Retry on failure.
- : [result]"=&r" (result),
- [temp]"=&r" (temp),
- [ptr]"+Q" (*ptr)
- : [increment]"IJr" (increment)
- : "memory"
- ); // NOLINT
-
- return result;
-}
-
-inline Atomic32 Barrier_AtomicIncrement(volatile Atomic32* ptr,
- Atomic32 increment) {
- MemoryBarrierInternal();
- Atomic32 result = NoBarrier_AtomicIncrement(ptr, increment);
- MemoryBarrierInternal();
-
- return result;
-}
-
-inline Atomic32 Acquire_CompareAndSwap(volatile Atomic32* ptr,
- Atomic32 old_value,
- Atomic32 new_value) {
- Atomic32 prev = NoBarrier_CompareAndSwap(ptr, old_value, new_value);
- MemoryBarrierInternal();
-
- return prev;
-}
-
-inline Atomic32 Release_CompareAndSwap(volatile Atomic32* ptr,
- Atomic32 old_value,
- Atomic32 new_value) {
- MemoryBarrierInternal();
- Atomic32 prev = NoBarrier_CompareAndSwap(ptr, old_value, new_value);
-
- return prev;
-}
-
-inline void NoBarrier_Store(volatile Atomic32* ptr, Atomic32 value) {
- *ptr = value;
-}
-
-inline void Acquire_Store(volatile Atomic32* ptr, Atomic32 value) {
- *ptr = value;
- MemoryBarrierInternal();
-}
-
-inline void Release_Store(volatile Atomic32* ptr, Atomic32 value) {
- __asm__ __volatile__ ( // NOLINT
- "stlr %w[value], %[ptr] \n\t"
- : [ptr]"=Q" (*ptr)
- : [value]"r" (value)
- : "memory"
- ); // NOLINT
-}
-
-inline Atomic32 NoBarrier_Load(volatile const Atomic32* ptr) {
- return *ptr;
-}
-
-inline Atomic32 Acquire_Load(volatile const Atomic32* ptr) {
- Atomic32 value;
-
- __asm__ __volatile__ ( // NOLINT
- "ldar %w[value], %[ptr] \n\t"
- : [value]"=r" (value)
- : [ptr]"Q" (*ptr)
- : "memory"
- ); // NOLINT
-
- return value;
-}
-
-inline Atomic32 Release_Load(volatile const Atomic32* ptr) {
- MemoryBarrierInternal();
- return *ptr;
-}
-
-// 64-bit versions of the operations.
-// See the 32-bit versions for comments.
-
-inline Atomic64 NoBarrier_CompareAndSwap(volatile Atomic64* ptr,
- Atomic64 old_value,
- Atomic64 new_value) {
- Atomic64 prev;
- int32_t temp;
-
- __asm__ __volatile__ ( // NOLINT
- "0: \n\t"
- "ldxr %[prev], %[ptr] \n\t"
- "cmp %[prev], %[old_value] \n\t"
- "bne 1f \n\t"
- "stxr %w[temp], %[new_value], %[ptr] \n\t"
- "cbnz %w[temp], 0b \n\t"
- "1: \n\t"
- : [prev]"=&r" (prev),
- [temp]"=&r" (temp),
- [ptr]"+Q" (*ptr)
- : [old_value]"IJr" (old_value),
- [new_value]"r" (new_value)
- : "cc", "memory"
- ); // NOLINT
-
- return prev;
-}
-
-inline Atomic64 NoBarrier_AtomicExchange(volatile Atomic64* ptr,
- Atomic64 new_value) {
- Atomic64 result;
- int32_t temp;
-
- __asm__ __volatile__ ( // NOLINT
- "0: \n\t"
- "ldxr %[result], %[ptr] \n\t"
- "stxr %w[temp], %[new_value], %[ptr] \n\t"
- "cbnz %w[temp], 0b \n\t"
- : [result]"=&r" (result),
- [temp]"=&r" (temp),
- [ptr]"+Q" (*ptr)
- : [new_value]"r" (new_value)
- : "memory"
- ); // NOLINT
-
- return result;
-}
-
-inline Atomic64 NoBarrier_AtomicIncrement(volatile Atomic64* ptr,
- Atomic64 increment) {
- Atomic64 result;
- int32_t temp;
-
- __asm__ __volatile__ ( // NOLINT
- "0: \n\t"
- "ldxr %[result], %[ptr] \n\t"
- "add %[result], %[result], %[increment] \n\t"
- "stxr %w[temp], %[result], %[ptr] \n\t"
- "cbnz %w[temp], 0b \n\t"
- : [result]"=&r" (result),
- [temp]"=&r" (temp),
- [ptr]"+Q" (*ptr)
- : [increment]"IJr" (increment)
- : "memory"
- ); // NOLINT
-
- return result;
-}
-
-inline Atomic64 Barrier_AtomicIncrement(volatile Atomic64* ptr,
- Atomic64 increment) {
- MemoryBarrierInternal();
- Atomic64 result = NoBarrier_AtomicIncrement(ptr, increment);
- MemoryBarrierInternal();
-
- return result;
-}
-
-inline Atomic64 Acquire_CompareAndSwap(volatile Atomic64* ptr,
- Atomic64 old_value,
- Atomic64 new_value) {
- Atomic64 prev = NoBarrier_CompareAndSwap(ptr, old_value, new_value);
- MemoryBarrierInternal();
-
- return prev;
-}
-
-inline Atomic64 Release_CompareAndSwap(volatile Atomic64* ptr,
- Atomic64 old_value,
- Atomic64 new_value) {
- MemoryBarrierInternal();
- Atomic64 prev = NoBarrier_CompareAndSwap(ptr, old_value, new_value);
-
- return prev;
-}
-
-inline void NoBarrier_Store(volatile Atomic64* ptr, Atomic64 value) {
- *ptr = value;
-}
-
-inline void Acquire_Store(volatile Atomic64* ptr, Atomic64 value) {
- *ptr = value;
- MemoryBarrierInternal();
-}
-
-inline void Release_Store(volatile Atomic64* ptr, Atomic64 value) {
- __asm__ __volatile__ ( // NOLINT
- "stlr %x[value], %[ptr] \n\t"
- : [ptr]"=Q" (*ptr)
- : [value]"r" (value)
- : "memory"
- ); // NOLINT
-}
-
-inline Atomic64 NoBarrier_Load(volatile const Atomic64* ptr) {
- return *ptr;
-}
-
-inline Atomic64 Acquire_Load(volatile const Atomic64* ptr) {
- Atomic64 value;
-
- __asm__ __volatile__ ( // NOLINT
- "ldar %x[value], %[ptr] \n\t"
- : [value]"=r" (value)
- : [ptr]"Q" (*ptr)
- : "memory"
- ); // NOLINT
-
- return value;
-}
-
-inline Atomic64 Release_Load(volatile const Atomic64* ptr) {
- MemoryBarrierInternal();
- return *ptr;
-}
-
-} // namespace internal
-} // namespace protobuf
-} // namespace google
-
-#endif // GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_ARM64_GCC_H_
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