WebSocket frame masking: use SIMD for ARM

net/websockets/websocket_frame.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/websockets/websocket_frame.h"
 
 #include <stddef.h>
 #include <algorithm>
 
 #include "base/big_endian.h"
 #include "base/logging.h"
 #include "base/rand_util.h"
 #include "net/base/io_buffer.h"
 #include "net/base/net_errors.h"
 
 namespace net {
 
 namespace {
 
 // GCC (and Clang) can transparently use vector ops. Only try to do this on
 // architectures where we know it works, otherwise gcc will attempt to emulate
 // the vector ops, which is unlikely to be efficient.
 // TODO(ricea): Add ARCH_CPU_ARM_FAMILY when arm_neon=1 becomes the default.
-#if defined(COMPILER_GCC) && defined(ARCH_CPU_X86_FAMILY) && !defined(OS_NACL)
+#if defined(COMPILER_GCC) &&                                          \
+    (defined(ARCH_CPU_X86_FAMILY) || defined(ARCH_CPU_ARM_FAMILY)) && \
+    !defined(OS_NACL)
 
 using PackedMaskType = uint32_t __attribute__((vector_size(16)));
 
 #else
 
 using PackedMaskType = size_t;
 
-#endif  // defined(COMPILER_GCC) && defined(ARCH_CPU_X86_FAMILY) &&
+#endif  // defined(COMPILER_GCC) &&
+        // (defined(ARCH_CPU_X86_FAMILY) || defined(ARCH_CPU_ARM_FAMILY)) &&
         // !defined(OS_NACL)
 
 const uint8_t kFinalBit = 0x80;
 const uint8_t kReserved1Bit = 0x40;
 const uint8_t kReserved2Bit = 0x20;
 const uint8_t kReserved3Bit = 0x10;
 const uint8_t kOpCodeMask = 0xF;
 const uint8_t kMaskBit = 0x80;
 const uint64_t kMaxPayloadLengthWithoutExtendedLengthField = 125;
 const uint64_t kPayloadLengthWithTwoByteExtendedLengthField = 126;
@@ skipping 200 matching lines @@
   }
 
   MaskWebSocketFramePayloadByBytes(
       masking_key,
       (frame_offset + (aligned_end - data)) % kMaskingKeyLength,
       aligned_end,
       end);
 }
 
 }  // namespace net