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-rw-r--r--src/google/protobuf/stubs/port.h10
1 files changed, 8 insertions, 2 deletions
diff --git a/src/google/protobuf/stubs/port.h b/src/google/protobuf/stubs/port.h
index 6ec5e001..0afd55d7 100644
--- a/src/google/protobuf/stubs/port.h
+++ b/src/google/protobuf/stubs/port.h
@@ -252,9 +252,15 @@ static const uint64 kuint64max = GOOGLE_ULONGLONG(0xFFFFFFFFFFFFFFFF);
#define GOOGLE_GUARDED_BY(x)
#define GOOGLE_ATTRIBUTE_COLD
+#ifdef GOOGLE_PROTOBUF_DONT_USE_UNALIGNED
+# define GOOGLE_PROTOBUF_USE_UNALIGNED 0
+#else
// x86 and x86-64 can perform unaligned loads/stores directly.
-#if defined(_M_X64) || defined(__x86_64__) || \
- defined(_M_IX86) || defined(__i386__)
+# define GOOGLE_PROTOBUF_USE_UNALIGNED defined(_M_X64) || \
+ defined(__x86_64__) || defined(_M_IX86) || defined(__i386__)
+#endif
+
+#if GOOGLE_PROTOBUF_USE_UNALIGNED
#define GOOGLE_UNALIGNED_LOAD16(_p) (*reinterpret_cast<const uint16 *>(_p))
#define GOOGLE_UNALIGNED_LOAD32(_p) (*reinterpret_cast<const uint32 *>(_p))