On Tue, Apr 25, 2017 at 5:22 AM, T L <tapir....@gmail.com> wrote:
>
> package main
>
> import (
> "unsafe"
> )
>
> func alignment(p *int64) uintptr {
> return unsafe.Alignof(*p)
> // compiler doesn't know if *p is a field or a variable.
> // so compiler will treat *p as a variable, I think.
> }
>
> type T struct {
> x int64
> }
>
> func main() {
> var t T
> println( alignment(&t.x) ) // case 1
> println( unsafe.Alignof(*&t.x) ) // case 2
> println( unsafe.Alignof(t.x) ) // case 3
> // Is the case 2 equivalent to case 1 or case 3?
> }
Case 2 is equivalent to case 1. AlignOf only has special treatment
for a `Selector` (https://golang.org/ref/spec#Selectors) and *&t.x is
not a Selector.
For the gc toolchain all three cases will be the same value anyhow.
It's only gccgo that sometimes has a separate alignment for a field
and a value.
Ian
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