Change compiler to safely write unsafe smis when they are spilled from...

src/register-allocator-ia32.cc

 // Copyright 2008 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 22 matching lines @@
 namespace v8 { namespace internal {
 
 // -------------------------------------------------------------------------
 // Result implementation.
 
 void Result::ToRegister() {
   ASSERT(is_valid());
   if (is_constant()) {
     Result fresh = cgen_->allocator()->Allocate();
     ASSERT(fresh.is_valid());
-    cgen_->masm()->Set(fresh.reg(), Immediate(handle()));
+    if (cgen_->IsUnsafeSmi(handle())) {
+      cgen_->LoadUnsafeSmi(fresh.reg(), handle());
+    } else {
+      cgen_->masm()->Set(fresh.reg(), Immediate(handle()));
+    }
     // This result becomes a copy of the fresh one.
     *this = fresh;
   }
   ASSERT(is_register());
 }
 
 
 void Result::ToRegister(Register target) {
   ASSERT(is_valid());
   if (!is_register() || !reg().is(target)) {
     Result fresh = cgen_->allocator()->Allocate(target);
     ASSERT(fresh.is_valid());
     if (is_register()) {
       cgen_->masm()->mov(fresh.reg(), reg());
     } else {
       ASSERT(is_constant());
-      cgen_->masm()->Set(fresh.reg(), Immediate(handle()));
+      if (cgen_->IsUnsafeSmi(handle())) {
+        cgen_->LoadUnsafeSmi(fresh.reg(), handle());
+      } else {
+        cgen_->masm()->Set(fresh.reg(), Immediate(handle()));
+      }
     }
     *this = fresh;
   } else if (is_register() && reg().is(target)) {
     ASSERT(cgen_->has_valid_frame());
     cgen_->frame()->Spill(target);
     ASSERT(cgen_->allocator()->count(target) == 1);
   }
   ASSERT(is_register());
   ASSERT(reg().is(target));
 }
@@ skipping 42 matching lines @@
   // register if valid and return an invalid result.
   if (result.is_valid() && !result.reg().is_byte_register()) {
     result.Unuse();
     return Result(cgen_);
   }
   return result;
 }
 
 
 } }  // namespace v8::internal