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Marius Gerbershagen authored
The previous function call sequence for ordinary global functions looked as follows. 1. check whether the function is defined, i.e. whether symbol->symbol.gfdef is not NULL 2. set the_env->function to symbol->symbol.gfdef 3. call the function pointer symbol->symbol.gfdef->cfun.entry This commit implements a performance optimization that enables us to skip the first step. The basic idea is to replace symbol->symbol.gfdef with a closure that signals an undefined-function condition. However, straightforwardly implementing this would have the disadvantage that it would consume a larger amount of memory for each symbol without a function definition. To get around this, we reorder the fields of the ecl_symbol struct such that the symbol can serve as the function object itself, introducing an entry point that is only used for undefined functions. Benchmarking shows an improvement of about 10% in thight loops compared to the old method.
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