How Can I Disable Function Inlining in Go?

Disabling Function Inlining in Go

In certain scenarios, it may be necessary to instruct the Go compiler to avoid inlining specific functions. The built-in inlining optimization can impact code performance and visibility, leading to slower execution or difficulty debugging complex call sequences.

Using the //go:noinline Pragma

To disable inlining for a particular function, you can use the //go:noinline pragma. Simply place the directive before the desired function declaration:

//go:noinline
func isPrime(p int) bool {
    // ...
}

Disabling All Inlining

If you prefer to disable inlining for all functions in your program, you can use the -gcflags=-l flag during compilation. This option sets the Go compiler's flags to disable inlining:

go build -gcflags=-l primes.go

Additional Notes

• The use of the //go:noinline pragma provides a selective approach to disabling inlining.
• The -gcflags=-l flag offers a global disabling option, which can be useful for debugging or improving performance.
• This technique is similar to using the -O0 flag in GCC to prevent compiler optimizations.
• Consider using these options cautiously, as inlining can significantly improve code efficiency in many cases.

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