Re: shame on MISRA

Marcin Wolcendorf <wolcendo@xxxxxxxxxxxxxx> wrote:
On Sun, 22 Apr 2007 08:58:18 -0700, Arlet wrote:

On Apr 22, 12:44 pm, Marcin Wolcendorf <wolce...@xxxxxxxxxxxxxx>
wrote:

No. It doesn't. One of the rules states (I don't have them in front
of me), that you can't use signed constants (like -1U) to set
unsigned variables. -1U is a nice value of all 1s binary,
convenient for masking. Well, you can get
...

Just use ~0U

True :).
I can't recall the reason, why I didn't use it.

Yeah, now I can. It just doesn't matter. If I use ~0U it will trigger
MISRA-C rule 10.1 (An integer constant expression with negative value is
being converted to an unsigned type.) just as -1U does. No difference
from MISRA-C check point of view. It is a better way- logical operators
only, and this is a logical value- but it is not enough.

M.



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