Add X32 port into V8

src/runtime.cc

 // 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.
 
 #include <stdlib.h>
 #include <limits>
 
 #include "src/v8.h"
 
 #include "src/accessors.h"
@@ skipping 9120 matching lines @@
   Object* y;
 };
 
 
 static inline ObjectPair MakePair(Object* x, Object* y) {
   ObjectPair result = {x, y};
   // Pointers x and y returned in rax and rdx, in AMD-x64-abi.
   // In Win64 they are assigned to a hidden first argument.
   return result;
 }
+#elif V8_TARGET_ARCH_X64 && V8_TARGET_ARCH_32_BIT
+// For x32 a 128-bit struct return is done as rax and rdx from the ObjectPair
+// are used in the full codegen and Crankshaft compiler. An alternative is
+// using uint64_t and modifying full codegen and Crankshaft compiler.
+struct ObjectPair {
+  Object* x;
+  uint32_t x_upper;
+  Object* y;
+  uint32_t y_upper;
+};
+
+
+static inline ObjectPair MakePair(Object* x, Object* y) {
+  ObjectPair result = {x, 0, y, 0};
+  // Pointers x and y returned in rax and rdx, in x32-abi.
+  return result;
+}
 #else
 typedef uint64_t ObjectPair;
 static inline ObjectPair MakePair(Object* x, Object* y) {
 #if defined(V8_TARGET_LITTLE_ENDIAN)
   return reinterpret_cast<uint32_t>(x) |
       (reinterpret_cast<ObjectPair>(y) << 32);
 #elif defined(V8_TARGET_BIG_ENDIAN)
     return reinterpret_cast<uint32_t>(y) |
         (reinterpret_cast<ObjectPair>(x) << 32);
 #else
@@ skipping 5958 matching lines @@
   }
   return NULL;
 }
 
 
 const Runtime::Function* Runtime::FunctionForId(Runtime::FunctionId id) {
   return &(kIntrinsicFunctions[static_cast<int>(id)]);
 }
 
 } }  // namespace v8::internal