Allow unaligned accesses for ARMv7.

src/globals.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // 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
@@ skipping 118 matching lines @@
 // the use of a simulated environment.
 #if !defined(USE_SIMULATOR)
 #if (defined(V8_TARGET_ARCH_ARM) && !defined(V8_HOST_ARCH_ARM))
 #define USE_SIMULATOR 1
 #endif
 #if (defined(V8_TARGET_ARCH_MIPS) && !defined(V8_HOST_ARCH_MIPS))
 #define USE_SIMULATOR 1
 #endif
 #endif
 
-// Define unaligned read for the target architectures supporting it.
-#if defined(V8_TARGET_ARCH_X64) || defined(V8_TARGET_ARCH_IA32)
-#define V8_TARGET_CAN_READ_UNALIGNED 1
-#elif V8_TARGET_ARCH_ARM
-// Some CPU-OS combinations allow unaligned access on ARM. We assume
-// that unaligned accesses are not allowed unless the build system
-// defines the CAN_USE_UNALIGNED_ACCESSES macro to be non-zero.
-#if CAN_USE_UNALIGNED_ACCESSES
-#define V8_TARGET_CAN_READ_UNALIGNED 1
-#endif
-#elif V8_TARGET_ARCH_MIPS
-#else
-#error Target architecture is not supported by v8
-#endif
-
 // Support for alternative bool type. This is only enabled if the code is
 // compiled with USE_MYBOOL defined. This catches some nasty type bugs.
 // For instance, 'bool b = "false";' results in b == true! This is a hidden
 // source of bugs.
 // However, redefining the bool type does have some negative impact on some
 // platforms. It gives rise to compiler warnings (i.e. with
 // MSVC) in the API header files when mixing code that uses the standard
 // bool with code that uses the redefined version.
 // This does not actually belong in the platform code, but needs to be
 // defined here because the platform code uses bool, and platform.h is
@@ skipping 247 matching lines @@
 // the backend, so both modes are represented by the kStrictMode value.
 enum StrictModeFlag {
   kNonStrictMode,
   kStrictMode
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_GLOBALS_H_