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# dmd.optimize

Perform constant folding.
Authors:
Walter Bright
License:
Boost License 1.0

Source optimize.d

Documentation https://dlang.org/phobos/dmd_optimize.html

Coverage https://codecov.io/gh/dlang/dmd/src/master/src/dmd/optimize.d

Expression `expandVar`(int `result`, VarDeclaration `v`);
  If variable has a const initializer, return that initializer.
  Returns:
  initializer if there is one, null if not, ErrorExp if error
Expression `Expression_optimize`(Expression `e`, int `result`, bool `keepLvalue`);
  Constant fold an Expression.
  Parameters:

  Expression `e` | expression to const fold; this may get modified in-place
  int `result` | WANTvalue, WANTexpand, or both
  bool `keepLvalue` | `e` is an lvalue, and keep it as an lvalue since it is an argument to a ref or out parameter, or the operand of & operator

  Returns:
  Constant folded version of `e`

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