Lpc2000

Quoting dsidlauskas1 <dsidlauskas@...>:

> Consider the following code:
>
> ============================
> char buf[]={1,2,3,4,5,6,7,8};
> int *ip, x[4];
>
> for (i=0; i<4; i++)
>    {
>    ip = (int *)&buf[i];
>    x[4]  = *ip;
>    }
> =============================
> The Keil compiler compiles this without warning, but does not produce
> the expected (for me) result in x. The problem is that Keil uses the
> LDR instruction to effect the transfer and this is valid only on 4
> byte boundaries.
>
> GCC compiles but does give a non-aligned access warning.
>
> I believe that the compiler has enough information to use byte aligned
> transfers, and should, or at least give a warning.
>
> Anybody want to weigh in on this one.

The short answer is that the code is broken.  The only semi-portable way to do
this is memcpy.

There is no requirement to provide a warning in this case AFAIK.  That's a
quality of implementation issue.

Robert