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81 lines
2.8 KiB
Markdown
81 lines
2.8 KiB
Markdown
---
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title: "Enabling compiler built-ins"
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weight: 7
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---
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From: `20.24.0`
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Many of the features or options in the ETL can be enhanced by the use of compiler built-ins.
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If built-ins are available and the STL is not used, then many copy type algorithms may be declared as `constexpr`.
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Also, some type traits can detect types more correctly.
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## Controlling Macros
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If any of these are set to `1`, then the ETL will use the compiler built-ins, were applicable.
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Setting them to `0` will disable the use of the built-in.
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Setting any of these in the project or `etl_profile.h` will override any later tests.
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```cpp
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ETL_USE_BUILTIN_MEMCPY
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ETL_USE_BUILTIN_MEMCMP
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ETL_USE_BUILTIN_MEMMOVE
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ETL_USE_BUILTIN_MEMSET
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```
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```cpp
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ETL_USE_BUILTIN_IS_ASSIGNABLE
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ETL_USE_BUILTIN_IS_CONSTRUCTIBLE
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ETL_USE_BUILTIN_IS_TRIVIALLY_CONSTRUCTIBLE
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ETL_USE_BUILTIN_IS_TRIVIALLY_DESTRUCTIBLE
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ETL_USE_BUILTIN_IS_TRIVIALLY_COPYABLE
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```
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## Defining macros
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The use of built-ins can be controlled by macros.
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If `ETL_USING_MEM_BUILTINS` is defined and the corresponding macro has not already been set, then following will be set to `1`.
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```cpp
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ETL_USE_BUILTIN_MEMCPY
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ETL_USE_BUILTIN_MEMCMP
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ETL_USE_BUILTIN_MEMMOVE
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ETL_USE_BUILTIN_MEMSET
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```
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If `ETL_USING_TYPE_TRAITS_BUILTINS` is defined and the corresponding macro has not already been set, then following will be set to `1`.
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```cpp
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ETL_USE_BUILTIN_IS_ASSIGNABLE
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ETL_USE_BUILTIN_IS_CONSTRUCTIBLE
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ETL_USE_BUILTIN_IS_TRIVIALLY_CONSTRUCTIBLE
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ETL_USE_BUILTIN_IS_TRIVIALLY_DESTRUCTIBLE
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ETL_USE_BUILTIN_IS_TRIVIALLY_COPYABLE
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```
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## Detection of built-ins
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These tests occur after the above macro tests.
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The ETL will attempt to check the availability of compiler built-ins.
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If `__has_builtin` exists, then the existence of the following built-ins are checked.
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If not already defined, the corresponding macro is set according to the result.
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---
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Sets `ETL_USE_BUILTIN_MEMCPY = 1` if `__builtin_memcmp` exists, otherwise `0`.
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Sets `ETL_USE_BUILTIN_MEMCPY = 1` if `__builtin_memcpy exists`, otherwise `0`.
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Sets `ETL_USE_BUILTIN_MEMMOVE = 1` if `__builtin_memmove` exists, otherwise `0`.
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Sets `ETL_USE_BUILTIN_MEMSET = 1` if `__builtin_memset` exists, otherwise `0`.
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Sets `ETL_USE_BUILTIN_IS_ASSIGNABLE = 1` if `__is_assignable exists`, otherwise `0`.
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Sets `ETL_USE_BUILTIN_IS_CONSTRUCTIBLE = 1` if `__is_constructible` exists, otherwise `0`.
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Sets `ETL_USE_BUILTIN_IS_TRIVIALLY_CONSTRUCTIBLE = 1` if `__has_trivial_constructor` or `__is_trivially_constructible` exists, otherwise `0`.
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Sets `ETL_USE_BUILTIN_IS_TRIVIALLY_DESTRUCTIBLE = 1` if `__has_trivial_destructor` or `__is_trivially_destructible exists`, otherwise `0`.
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Sets `ETL_USE_BUILTIN_IS_TRIVIALLY_COPYABLE = 1` if `__has_trivial_copy` or `__is_trivially_copyable` exists, otherwise `0`.
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## Default
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Finally, any macro that has so far not been defined will be defined as `0`.
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