var arr {.align(256).}: MyArr
var obj {.align(256).}: MyObj
Run
I think this means references (or pointers) `arr` and `obj` are aligned, not
objects these references point are aligned.
type
MyArr = ref array[4, int]
MyObj = ref object
MyArrObj = ref object
arr {.align(256).}: array[4, int]
var arr {.align(256).}: MyArr
var obj {.align(256).}: MyObj
var arrObj: MyArrObj
arr = new MyArr # not aligned
obj = new MyObj # not aligned
arrObj = new MyArrObj # arrObj.arr is aligned
echo cast[uint](arr.addr).toHex # aligned
echo cast[uint](obj.addr).toHex # aligned
echo cast[uint](arr).toHex # not aligned
echo cast[uint](obj).toHex # not aligned
Run
As adding align pragma to a type is compile error, it seems defining an object
type and adding the pragma to the field is the only way to align referenced
object or array.
type
MyObj2 {.align(256).} = object # invalid pragma: align(256)
MyObj2Ref = ref MyObj2
MyArray {.align(256).} = array[4, int] # invalid pragma: align(256)
MyArrayRef = ref MyArray
Run
