x64 support for d-to-i (truncated)

src/ia32/code-stubs-ia32.cc

 // 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 647 matching lines @@
 
   Label check_negative, process_64_bits, done, done_no_stash;
 
   int double_offset = offset();
 
   // Account for return address and saved regs if input is esp.
   if (input_reg.is(esp)) double_offset += 3 * kPointerSize;
 
   MemOperand mantissa_operand(MemOperand(input_reg, double_offset));
   MemOperand exponent_operand(MemOperand(input_reg,
-                                         double_offset + kPointerSize));
+                                         double_offset + kDoubleSize / 2));
 
   Register scratch1;
   {
     Register scratch_candidates[3] = { ebx, edx, edi };
     for (int i = 0; i < 3; i++) {
       scratch1 = scratch_candidates[i];
       if (!final_result_reg.is(scratch1) && !input_reg.is(scratch1)) break;
     }
   }
   // Since we must use ecx for shifts below, use some other register (eax)
@@ skipping 7091 matching lines @@
   __ bind(&fast_elements_case);
   GenerateCase(masm, FAST_ELEMENTS);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32