Easy to read Golang assembly output?

Question

I\'m interested in examining the x86 assembly output of the standard Go compiler to see if my code is really being converted into reasonably efficient assembly code; hopeful

Answer 1

I had problems with the other answers as the assembly produced provided much more information than I wanted and still not enough details. Let me explain: it provided the assembly for all libraries imported by go internally and did not provide the lines of where my code was (my code was all at the bottom of the file)

Here is what I found from the official docs:

$ GOOS=linux GOARCH=amd64 go tool compile -S x.go # or: go build -gcflags -S x.go

File:

package main

func main() {
    println(3)
}

Produces:

--- prog list "main" ---
0000 (x.go:3) TEXT    main+0(SB),$8-0
0001 (x.go:3) FUNCDATA $0,gcargs·0+0(SB)
0002 (x.go:3) FUNCDATA $1,gclocals·0+0(SB)
0003 (x.go:4) MOVQ    $3,(SP)
0004 (x.go:4) PCDATA  $0,$8
0005 (x.go:4) CALL    ,runtime.printint+0(SB)
0006 (x.go:4) PCDATA  $0,$-1
0007 (x.go:4) PCDATA  $0,$0
0008 (x.go:4) CALL    ,runtime.printnl+0(SB)
0009 (x.go:4) PCDATA  $0,$-1
0010 (x.go:5) RET     ,

So what I did was basically:

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

and it got the result I wanted!