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For C compatible variadic dispatch, the compiler now generates two entrypoints for variadic functions. An entrypoint with specialized signature that is used for direct C calls from the same file and an entrypoint with generic signature that implements the variadic to variadic dispatch, i.e. checking the number of arguments and then calling the specialized entrypoint. This approach is faster than using the wrapper functions in variadic_dispatch_table. The reasons are threefold: we save a call to ecl_process_env(), we don't need a call through a function pointer but instead use a direct call to the specialized entrypoint and we emit better code to deal with required arguments since the number of those are known. Moreover, for functions with optional arguments the new approach is less stack hungry since we can allocate an array of size smaller than ECL_C_ARGUMENTS_LIMIT to store the arguments. |
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| developer-guide | ||
| extensions | ||
| figures | ||
| indexes | ||
| introduction | ||
| standards | ||
| user-guide | ||
| .gitignore | ||
| ecl.css | ||
| macros.txi | ||
| Makefile | ||
| manual.txi | ||
| status.org | ||