Let's talk about the cancel inline feature in Go language

Golang is a language with encapsulation and simplicity as its core design concepts. It has powerful syntax and excellent performance. Among them, inlining is a technology crucial for performance optimization. The principle of inlining is to embed the instruction of calling the function directly into the place where it is called, thus eliminating the overhead of pushing, popping and jumping. However, Go introduced a new feature after 1.9: canceling inline. In this article, we will discuss the uninlining feature in Go language and explore why it is necessary in some cases.

In the Golang language, inlining and canceling inlining are enabled by default. However, in some cases, it is necessary to cancel the inlining behavior, which can avoid the compiler's excessive optimization and the performance degradation of the program. In Go language, the way to cancel inlining is very simple, just add //go:noinline before the function declaration. Canceling inlining will prevent the instruction to call the function from being directly embedded, thus increasing the overhead of calling the function. Therefore, for most performance-critical code, you should avoid using the deinline feature.

Why do we need to cancel inlining in some cases? This is because in some cases, inlining will cause the performance of the code to decrease. So, when will this happen? First of all, when we try to inline a very large function, the compiler may give up inlining due to insufficient stack memory. At this time, canceling inlining will avoid such a situation, allowing the program to perform as best as possible. good performance. The second case is that a function is called less often. In this case, inlining will cause the program code to expand, which may have a certain negative impact on the cache. Cancel inlining can simplify the code structure and improve the performance of the program. Even better.

In addition, there are other application scenarios for canceling inlining, such as disabling inlining in debugging mode to make function calls more traceable; canceling inlining in some environments that require dynamic link libraries Functions can be exported, but this will increase a certain amount of disk space and function call overhead.

In short, inlining and canceling inlining is a commonly used performance optimization technique in the Go language. However, in some cases, canceling inlining may be necessary to ensure that the performance of the program is not affected by internal changes. decline due to adverse effects caused by the association. At the same time, we should also make it clear that canceling inlining is only suitable for improving the performance of the code to a certain extent, and cannot instantly improve the performance of the program to a completely different level. In practice, the cancel inlining feature needs to be used flexibly according to the specific situation.

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