Fix ARM build for gcc 4.2 on mac

src/arm/simulator-arm.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 3033 matching lines @@
     VFPRoundingMode mode = (instr->Bit(7) != 1) ? FPSCR_rounding_mode_
                                                 : RZ;
     ASSERT((mode == RM) || (mode == RZ) || (mode == RN));
 
     bool unsigned_integer = (instr->Bit(16) == 0);
     bool double_precision = (src_precision == kDoublePrecision);
 
     double val = double_precision ? get_double_from_d_register(src)
                                   : get_float_from_s_register(src);
 
-    int temp = unsigned_integer ? static_cast<uint32_t>(val)
-                                : static_cast<int32_t>(val);
+    int temp = unsigned_integer ? static_cast<int>(val)
+                                : static_cast<int>(val);

[Jakob Kummerow, 2012/07/16 15:06:07]

I don't think this change is correct, as it effectively ignores the
unsigned_integer bool. I think in the unsigned case you need to cast twice:
double -> uint32_t -> int, as in:

int temp = unsigned_integer
    ? static_cast<int>(static_cast<uint32_t>(val))
    : static_cast<int>(val);

 
     inv_op_vfp_flag_ = get_inv_op_vfp_flag(mode, val, unsigned_integer);
 
     double abs_diff =
       unsigned_integer ? fabs(val - static_cast<uint32_t>(temp))
                        : fabs(val - temp);
 
     inexact_vfp_flag_ = (abs_diff != 0);
 
     if (inv_op_vfp_flag_) {
@@ skipping 360 matching lines @@
   uintptr_t address = *stack_slot;
   set_register(sp, current_sp + sizeof(uintptr_t));
   return address;
 }
 
 } }  // namespace v8::internal
 
 #endif  // USE_SIMULATOR
 
 #endif  // V8_TARGET_ARCH_ARM