Promise bytecode optimisation using staticness assertions
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bytecode optimisation staticness assertions bytecode optimisation staticness

Promise Description

bytecode optimisation using staticness assertions promise offers bytecode optimisation using staticness assertions.This is a module for applying some simple optimisations to function bytecode. By promising that a function doesn't do certain things at run-time, it's possible to apply optimisations that are not legal in the general case.As a simple example, it's possible to promise that a function doesn't modify (or care if anyone else modifies) any builtin functions by decorating it thus: @promise.constant(__builtins__) def function(): ...Such a promise will allow the builtins to be stored as direct object references in the function bytecode, avoiding name lookups during function execution.As another example, it's possible to promise that a function is pure; i.e. that it's a simple algorithm for mapping input values to an output value: @promise.pure() def calculate(a,b): return 2*a*a + 3*b + 7If a pure function is then used by another function as a constant, it can be directly inlined into the bytecode to avoid the overhead of a function call. Requirements: · Python

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