Does nano-malloc support target without unaligned load/store instructions?

[Can Finner]

On Fri, Jan 22, 2016 at 9:14 AM, Pei-Shiang Hung <pshung807@gmail.com> wrote:
> In nano-mallocr.c,
> 262     while (r)
> 263     {
> 264         int rem = r->size - alloc_size;
> 265         if (rem >= 0)
> 266         {
> 267             if (rem >= MALLOC_MINCHUNK)
> 268             {
> 269                 /* Find a chunk that much larger than required size, break
> 270                 * it into two chunks and return the second one */
> 271                 r->size = rem;
> 272                 r = (chunk *)((char *)r + rem);
> 273                 r->size = alloc_size;
> 274             }
>
> line 272, it is dangerous to cast 'r' to 'char *', plus 'rem', then
> cast back to 'chunk *'. What if the given 'rem' is not a word-aligned
> number? It can cause unaligned access exception.  (This does happen in
> my application.)
>
> So, does nano-malloc be designed for specific target with unaligned
> memory access instructions only(eg. ARM)?
>
>
> Thanks all.

Suppose we can support that with a little bit memory cost?  CCing Joey
about this.

Thanks,
bin


-- 
Regards.