Optimization
OptimizationLevel is an enum class indicating the possible degrees of optimization effort. These are arranged approximately monotonically increasing in terms of both cost to generate and expected performance improvement.
Entries
Unoptimized code, interpreted via Level One machinery. Technically the current implementation only executes Level Two code, but the default Level Two chunk relies on a Level Two instruction that simply fetches each nybblecode and interprets it.
Translate the nybblecodes quickly into an L2SimpleChunk.
The initial translation into Level Two instructions customized to a particular raw function. This at least should avoid the cost of fetching nybblecodes. It also avoids looking up monomorphic methods at execution time, and can inline or even fold calls to suitable primitives. The inlined calls to infallible primitives are simpler than the calls to fallible ones or non-primitives or polymorphic methods. Inlined primitive attempts avoid having to reify the calling continuation in the case that they're successful, but have to reify if the primitive fails.
The initial translation into Level Two instructions customized to a particular raw function. This at least should avoid the cost of fetching nybblecodes. It also avoids looking up monomorphic methods at execution time, and can inline or even fold calls to suitable primitives. The inlined calls to infallible primitives are simpler than the calls to fallible ones or non-primitives or polymorphic methods. Inlined primitive attempts avoid having to reify the calling continuation in the case that they're successful, but have to reify if the primitive fails.
Unimplemented. The idea is that at this level some inlining of non-primitives will take place, emphasizing inlining of function application. Invocations of methods that take a literal function should tend very strongly to get inlined, as the potential to turn things like continuation-based conditionals and loops into mere jumps is expected to be highly profitable.
Functions
Perform this level of optimization on the given A_RawFunction.
Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)
Returns an array containing the constants of this enum type, in the order they're declared.