Constant-fold !<number>

src/parser.cc

Index: src/parser.cc
===================================================================
--- src/parser.cc	(revision 8271)
+++ src/parser.cc	(working copy)
@@ -2555,6 +2555,12 @@
           return NewNumberLiteral(-value);
         case Token::BIT_NOT:
           return NewNumberLiteral(~DoubleToInt32(value));
+        case Token::NOT:
+          if (!isnan(value)) {

[Kevin Millikin (Chromium), 2011/06/14 08:40:35]

Does:

bool cond = isnan(value) || (value == 0);
Handle<Object> boolean(isolate()->heap()->ToBoolean(cond));

Handle the NaN case as well?

+            Handle<Object> boolean(isolate()->heap()->ToBoolean(value == 0));
+            return new(zone()) Literal(boolean);
+          }
+          break;
         default: break;
       }
     }