How Can I Make x86 Assembly Output from Go More Readable for Performance Tuning?

Making x86 Assembly Output Easier to Read for Performance Optimization

When examining the x86 assembly output of the Go compiler for performance optimization, the default output can be challenging to understand. This article addresses two concerns: generating an external assembly file and separating functions within the assembly code.

Generating an Assembly File

You can redirect the Go assembly output to a file using the following command:

go tool compile -S file.go > file.s

This saves the assembly code in a file named "file.s" for later analysis.

Separating Functions

To separate functions and add labels, disable the compiler optimizations with the -N flag:

go tool compile -S -N file.go

Alternatively, you can use the gccgo compiler:

gccgo -S -O0 -masm=intel test.go

gccgo will generate a file named "test.s" with assembly code that includes function boundaries and labels.

By specifying different optimization levels with -O{0-3}, you can observe the impact of optimizations on the assembly code and identify areas for potential performance improvements.

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