various go-assembler code is generated
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Паша Бурак
Jul 13, 2021, 5:51:32 PM7/13/21
to golang-nuts
https://go.godbolt.org/z/G8K79K48G - small
https://go.godbolt.org/z/Yv853E6P3 - long
>go version go1.16 windows/amd64
On the local machine i am executing go tool compile -S main.go > main.s
in the second case, I see that the compiler sees here a local variable entering the code. Why is this happening ? why is such a different code generated?
https://go.godbolt.org/z/Yv853E6P3 - long
>go version go1.16 windows/amd64
On the local machine i am executing go tool compile -S main.go > main.s
in the second case, I see that the compiler sees here a local variable entering the code. Why is this happening ? why is such a different code generated?
Keith Randall
Jul 13, 2021, 7:27:55 PM7/13/21
to golang-nuts
The Go compiler is not very good at eliminating redundant copies of large temporaries (structs with many fields, or arrays with length>1).
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