Faster to number conversion

src/hydrogen-instructions.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 2292 matching lines @@
                              unique_id_,
                              r,
                              type_from_value_,
                              is_internalized_string_,
                              is_not_in_new_space_,
                              is_cell_,
                              boolean_value_);
 }
 
 
-HConstant* HConstant::CopyToTruncatedInt32(Zone* zone) const {
-  if (has_int32_value_) {
-    return new(zone) HConstant(int32_value_,
-                               Representation::Integer32(),
-                               is_not_in_new_space_,
-                               handle_);
+Maybe<HConstant*> HConstant::CopyToTruncatedInt32(Zone* zone) {
+  HConstant* res = NULL;
+  if (has_int32_value_ || has_smi_value_) {
+    res = new(zone) HConstant(int32_value_,
+                              Representation::Integer32(),
+                              is_not_in_new_space_,
+                              handle_);
+  } else if (has_double_value_) {
+    res = new(zone) HConstant(DoubleToInt32(double_value_),
+                              Representation::Integer32(),
+                              is_not_in_new_space_,
+                              handle_);
+  } else {
+    ASSERT(!HasNumberValue());
+    Maybe<HConstant*> number = CopyToTruncatedNumber(zone);
+    if (number.has_value) return number.value->CopyToTruncatedInt32(zone);
   }
-  if (has_double_value_) {
-    return new(zone) HConstant(DoubleToInt32(double_value_),
-                               Representation::Integer32(),
-                               is_not_in_new_space_,
-                               handle_);
-  }
-  return NULL;
+  return Maybe<HConstant*>(res != NULL, res);
 }
 
 
+Maybe<HConstant*> HConstant::CopyToTruncatedNumber(Zone* zone) {
+  HConstant* res = NULL;
+  if (handle()->IsBoolean()) {
+    res = handle()->BooleanValue() ?
+      new(zone) HConstant(1) : new(zone) HConstant(0);
+  } else if (handle()->IsUndefined()) {
+    res = new(zone) HConstant(OS::nan_value());
+  } else if (handle()->IsNull()) {
+    res = new(zone) HConstant(0);
+  }
+  return Maybe<HConstant*>(res != NULL, res);
+}
+
+
 void HConstant::PrintDataTo(StringStream* stream) {
   if (has_int32_value_) {
     stream->Add("%d ", int32_value_);
   } else if (has_double_value_) {
     stream->Add("%f ", FmtElm(double_value_));
   } else {
     handle()->ShortPrint(stream);
   }
 }
 
@@ skipping 1654 matching lines @@
     case kBackingStore:
       if (!name_.is_null()) stream->Add(*String::cast(*name_)->ToCString());
       stream->Add("[backing-store]");
       break;
   }
 
   stream->Add("@%d", offset());
 }
 
 } }  // namespace v8::internal