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This article mainly explains "how to optimize C++ code". The content in the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "how to optimize C++ code".

Using template specialization or specialization techniques, you can specify special optimizations when using specific modules. For example, some MCU separate the IO space from the storage space, have special instructions to operate in the IO space, and can improve speed, and these devices can be optimized by specializing the device template. Take the atmega series chips in AVR as an example:

First define the port template (in avr, port registers are generally located in IO space, so use port devices as an example)

Templateclass Port {public: static void config (const byte mode) {/ * code here*/} static void write (const bit hl) {/ * code here*/} / *. Other members*/}

Secondly, define the optimized template.

Templateclass _ Port {public: _ _ attribute__ ((always_inline, optimize ("O3")) static void config (const byte mode) {/ * code here * /} / * other member * /}

Third, declare a special or all-specialized class

Templateclass Port: public m128::_Port {}

In this way, the compiler can use the optimized code when using port A.

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