fdo-mirrors/mesa
1
0
Fork 0
mirror of https://gitlab.freedesktop.org/mesa/mesa.git synced 2026-05-06 02:58:05 +02:00
Code Issues Projects Releases Packages Wiki Activity Actions 1

gallium/util: Add u_bit_scan_consecutive_range64.

Browse source 
For use by radeonsi.

v2: Make sure that it works for all 64 bits set.

Signed-off-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
This commit is contained in:
Bas Nieuwenhuizen 2016-04-13 23:30:55 +02:00
parent 058b54c624
commit 0b6c463dac
1 changed files with 14 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

14
src/gallium/auxiliary/util/u_math.h
View file

@ -529,6 +529,20 @@ u_bit_scan_consecutive_range(unsigned *mask, int *start, int *count)
*mask &= ~(((1u << *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.
*/