[LLVMdev] fields in structure re-arranged for alignment?

[Holger Schurig]

> For example would this structure on a 32-bit machine:
>
> { i16, i32, i16 }
>
> get re-arranged to
>
> { i16, i16, i32 } or { i32, i16, i16 }

If there will ever be a re-arrangement mechanism in the future, 
then LLVM needs some way to encode the equivalent of the 
packed/align attributes of GCC.

Sometimes it is OK to re-arrange, e.g. for things that are "just" 
structs. Sometimes it's very bad to re-arrange, e.g. for 
structures that have 1:1 representations in hardware, e.g. when 
you communicate an USB URB or a WLAN packet.