diff options
Diffstat (limited to 'deps/v8/src/parser.cc')
| -rw-r--r-- | deps/v8/src/parser.cc | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/deps/v8/src/parser.cc b/deps/v8/src/parser.cc index a9a5e32e23..2b4be79a0f 100644 --- a/deps/v8/src/parser.cc +++ b/deps/v8/src/parser.cc @@ -1582,7 +1582,8 @@ VariableProxy* AstBuildingParser::Declare(Handle<String> name, // For global const variables we bind the proxy to a variable. if (mode == Variable::CONST && top_scope_->is_global_scope()) { ASSERT(resolve); // should be set by all callers - var = NEW(Variable(top_scope_, name, Variable::CONST, true, false)); + Variable::Kind kind = Variable::NORMAL; + var = NEW(Variable(top_scope_, name, Variable::CONST, true, kind)); } // If requested and we have a local variable, bind the proxy to the variable @@ -2653,10 +2654,15 @@ Expression* Parser::ParseBinaryExpression(int prec, bool accept_IN, bool* ok) { double y_val = y->AsLiteral()->handle()->Number(); int64_t y_int = static_cast<int64_t>(y_val); // There are rounding issues with this optimization, but they don't - // apply if the number to be divided with has a reciprocal that can - // be precisely represented as a floating point number. This is - // the case if the number is an integer power of 2. - if (static_cast<double>(y_int) == y_val && IsPowerOf2(y_int)) { + // apply if the number to be divided with has a reciprocal that can be + // precisely represented as a floating point number. This is the case + // if the number is an integer power of 2. Negative integer powers of + // 2 work too, but for -2, -1, 1 and 2 we don't do the strength + // reduction because the inlined optimistic idiv has a reasonable + // chance of succeeding by producing a Smi answer with no remainder. + if (static_cast<double>(y_int) == y_val && + (IsPowerOf2(y_int) || IsPowerOf2(-y_int)) && + (y_int > 2 || y_int < -2)) { y = NewNumberLiteral(1 / y_val); op = Token::MUL; } |