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Compiler Logic for Function Inlining in Go
In Go, unlike C , the compiler autonomously determines which functions are appropriate for inlining. Although there is a debugging option to observe potential inlining, there is limited documentation regarding the exact criteria used by the Go compiler.
Inlining Optimization
Considering the need to execute a loop over a data set repeatedly, let's examine the code below:
func Encrypt(password []byte) ([]byte, error) { return bcrypt.GenerateFromPassword(password, 13) } for id, data := range someDataSet { newPassword, _ := Encrypt([]byte("generatedSomething")) data["password"] = newPassword someSaveCall(id, data) }
Considerations for Inlining
To potentially qualify the Encrypt function for inlining by the compiler, consider the following:
Compiler Logic
The Go compiler performs two passes for inlining:
The aggressiveness of inlining can be adjusted using the 'l' debug flag.
Recommendation
Unless performance becomes an issue, relying on the compiler's default inlining behavior is generally recommended. However, if significant performance gains are necessary, consider manually inlining small, frequently called functions to minimize overhead.
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