Rusty Russell writes:
> But we don't assume:
> union {
> TYPE t1;
> TYPE t2;
> TYPE t3;
> } union_TYPE;
>
> sizeof(union_TYPE) == sizeof(TYPE) because the ARM breaks this...
>
> So these `sane alignment' rules should be documented somewhere,
Same rules apply on ARM - the union is padded to the next 32-bit word
natural boundary, no matter what sizeof(TYPE) is. ie:
sizeof(TYPE) sizeof(union_TYPE)
1 4
2 4
4 4
_____
|_____| ------------------------------------------------- ---+---+-
| | Russell King rmk@arm.linux.org.uk --- ---
| | | | http://www.arm.linux.org.uk/~rmk/aboutme.html / / |
| +-+-+ --- -+-
/ | THE developer of ARM Linux |+| /|\
/ | | | --- |
+-+-+ ------------------------------------------------- /\\\ |
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