What is that compiler up to.

go compiler flags

go build -gcflags=-S hello.go
# command-line-arguments

--- prog list "main" ---
0000 (/Users/kelseyhightower/hello.go:5) TEXT    main+0(SB),$48-0
0001 (/Users/kelseyhightower/hello.go:5) LOCALS  ,$0
0002 (/Users/kelseyhightower/hello.go:6) MOVQ    os.Stdout+0(SB),SI
0003 (/Users/kelseyhightower/hello.go:6) MOVQ    SI,(SP)
0004 (/Users/kelseyhightower/hello.go:6) LEAQ    go.string."Hello, World\n"+0(SB),SI
0005 (/Users/kelseyhightower/hello.go:6) LEAQ    8(SP),BP
0006 (/Users/kelseyhightower/hello.go:6) MOVQ    BP,DI
0007 (/Users/kelseyhightower/hello.go:6) MOVSQ   ,
0008 (/Users/kelseyhightower/hello.go:6) MOVSQ   ,
0009 (/Users/kelseyhightower/hello.go:6) CALL    ,os.(*File).WriteString+0(SB)
0010 (/Users/kelseyhightower/hello.go:7) RET     ,

--- prog list "init" ---
0011 (/Users/kelseyhightower/hello.go:7) TEXT    init+0(SB),$0-0
0012 (/Users/kelseyhightower/hello.go:7) MOVBQZX initdone·+0(SB),AX
0013 (/Users/kelseyhightower/hello.go:7) LOCALS  ,$0
0014 (/Users/kelseyhightower/hello.go:7) CMPB    AX,$0
0015 (/Users/kelseyhightower/hello.go:7) JEQ     ,21
0016 (/Users/kelseyhightower/hello.go:7) CMPB    AX,$2
0017 (/Users/kelseyhightower/hello.go:7) JNE     ,19
0018 (/Users/kelseyhightower/hello.go:7) RET     ,
0019 (/Users/kelseyhightower/hello.go:7) CALL    ,runtime.throwinit+0(SB)
0020 (/Users/kelseyhightower/hello.go:7) UNDEF   ,
0021 (/Users/kelseyhightower/hello.go:7) MOVB    $1,initdone·+0(SB)
0022 (/Users/kelseyhightower/hello.go:7) CALL    ,os.init+0(SB)
0023 (/Users/kelseyhightower/hello.go:7) MOVB    $2,initdone·+0(SB)
0024 (/Users/kelseyhightower/hello.go:7) RET     ,