MIPS: Fix unaligned memory access.

src/objects-inl.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // Review notes:
 //
 // - The use of macros in these inline functions may seem superfluous
 // but it is absolutely needed to make sure gcc generates optimal
 // code. gcc is not happy when attempting to inline too deep.
 //
@@ skipping 1227 matching lines @@
   if (mode != SKIP_WRITE_BARRIER) {                                  \
     if (mode == UPDATE_WRITE_BARRIER) {                              \
       heap->incremental_marking()->RecordWrite(                      \
           object, HeapObject::RawField(object, offset), value);      \
     }                                                                \
     if (heap->InNewSpace(value)) {                                   \
       heap->RecordWrite(object->address(), offset);                  \
     }                                                                \
   }
 
-#ifndef V8_TARGET_ARCH_MIPS
-  #define READ_DOUBLE_FIELD(p, offset) \
-    (*reinterpret_cast<const double*>(FIELD_ADDR_CONST(p, offset)))
-#else  // V8_TARGET_ARCH_MIPS
-  // Prevent gcc from using load-double (mips ldc1) on (possibly)
-  // non-64-bit aligned HeapNumber::value.
-  static inline double read_double_field(const void* p, int offset) {
-    union conversion {
-      double d;
-      uint32_t u[2];
-    } c;
-    c.u[0] = (*reinterpret_cast<const uint32_t*>(
-        FIELD_ADDR_CONST(p, offset)));
-    c.u[1] = (*reinterpret_cast<const uint32_t*>(
-        FIELD_ADDR_CONST(p, offset + 4)));
-    return c.d;
-  }
-  #define READ_DOUBLE_FIELD(p, offset) read_double_field(p, offset)
-#endif  // V8_TARGET_ARCH_MIPS
+#define READ_DOUBLE_FIELD(p, offset) \
+  ReadDoubleValue(FIELD_ADDR_CONST(p, offset))
 
-#ifndef V8_TARGET_ARCH_MIPS
-  #define WRITE_DOUBLE_FIELD(p, offset, value) \
-    (*reinterpret_cast<double*>(FIELD_ADDR(p, offset)) = value)
-#else  // V8_TARGET_ARCH_MIPS
-  // Prevent gcc from using store-double (mips sdc1) on (possibly)
-  // non-64-bit aligned HeapNumber::value.
-  static inline void write_double_field(void* p, int offset,
-                                        double value) {
-    union conversion {
-      double d;
-      uint32_t u[2];
-    } c;
-    c.d = value;
-    (*reinterpret_cast<uint32_t*>(FIELD_ADDR(p, offset))) = c.u[0];
-    (*reinterpret_cast<uint32_t*>(FIELD_ADDR(p, offset + 4))) = c.u[1];
-  }
-  #define WRITE_DOUBLE_FIELD(p, offset, value) \
-    write_double_field(p, offset, value)
-#endif  // V8_TARGET_ARCH_MIPS
-
+#define WRITE_DOUBLE_FIELD(p, offset, value) \
+  WriteDoubleValue(FIELD_ADDR(p, offset), value)
 
 #define READ_INT_FIELD(p, offset) \
   (*reinterpret_cast<const int*>(FIELD_ADDR_CONST(p, offset)))
 
 #define WRITE_INT_FIELD(p, offset, value) \
   (*reinterpret_cast<int*>(FIELD_ADDR(p, offset)) = value)
 
 #define READ_INTPTR_FIELD(p, offset) \
   (*reinterpret_cast<const intptr_t*>(FIELD_ADDR_CONST(p, offset)))
 
@@ skipping 6060 matching lines @@
 #undef READ_SHORT_FIELD
 #undef WRITE_SHORT_FIELD
 #undef READ_BYTE_FIELD
 #undef WRITE_BYTE_FIELD
 #undef NOBARRIER_READ_BYTE_FIELD
 #undef NOBARRIER_WRITE_BYTE_FIELD
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_INL_H_