Reviewed-by: Marek Olšák <marek.ol...@amd.com>
Marek
On Sun, Apr 17, 2016 at 1:43 AM, Bas Nieuwenhuizen
<b...@basnieuwenhuizen.nl> wrote:
> For use by radeonsi.
>
> v2: Make sure that it works for all 64 bits set.
>
> Signed-off-by: Bas Nieuwenhuizen <b...@basnieuwenhuizen.nl>
> ---
> src/gallium/auxiliary/util/u_math.h | 14 ++++++++++++++
> 1 file changed, 14 insertions(+)
>
> diff --git a/src/gallium/auxiliary/util/u_math.h
> b/src/gallium/auxiliary/util/u_math.h
> index b4ac0db..96c1618 100644
> --- a/src/gallium/auxiliary/util/u_math.h
> +++ b/src/gallium/auxiliary/util/u_math.h
> @@ -523,6 +523,20 @@ u_bit_scan_consecutive_range(unsigned *mask, int *start,
> int *count)
> *mask &= ~(((1 << *count) - 1) << *start);
> }
>
> +static inline void
> +u_bit_scan_consecutive_range64(uint64_t *mask, int *start, int *count)
> +{
> + if (*mask == ~0llu) {
> + *start = 0;
> + *count = 64;
> + *mask = 0;
> + return;
> + }
> + *start = ffsll(*mask) - 1;
> + *count = ffsll(~(*mask >> *start)) - 1;
> + *mask &= ~(((1llu << *count) - 1) << *start);
> +}
> +
> /**
> * Return float bits.
> */
> --
> 2.8.0
>
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