On 03/05/13 02:03, Laszlo Ersek wrote:
> Alas these evaluate "low" twice, but I can't readily see a solution with
> single evaluation. For example
>
> #define BITS32(high, low) ((UINT32)-1 << (high) ^ (UINT32)-1 << (low))
>
> is undefined behavior for high==32 (which is valid input for the
> exclusive case).
This works though (since high >= 1):
#define BITS32(high, low) \
(~((UINT32)-1 >> 32 - (high)) ^ (UINT32)-1 << (low))
#define BITS64(high, low) \
(~((UINT64)-1 >> 64 - (high)) ^ (UINT32)-1 << (low))
Laszlo
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