Ping : H8/300 ABI Document

[Jim Wilson]

Anil Paranjape wrote:
> Structure Alignment
> Unless __attribute__ ((packed)) is attached to the declaration of a struct, each structure member is aligned 
> to a multiple of 2 bytes on H8/300 and of 4 bytes on H8/300H and H8S.

This is a maximum.  Fields get natural alignment (alignment same as 
size) up to this maximum.  So shorts are always 2 byte aligned, but 
4-byte ints get 2-byte alignment on H8/300 and 4-byte alignment on H8S.

Structure alignment is the max of the alignment of all fields.

Your suggested wording is not correct.  The structure in your example 
still has only 2-byte alignment even whwn compiled for H8S.
         .comm   _t,4,2
gives it a 4-byte size and 2-byte alignment.  This is because shorts 
always have 2-byte alignment.
-- 
Jim Wilson, GNU Tools Support, http://www.SpecifixInc.com