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vl/vlc: add remove bits function 

Signed-off-by: Christian König <christian.koenig@amd.com>
This commit is contained in:
Christian König 2013-09-17 07:22:34 -06:00
parent fe0f9ab056
commit 9ef42a54a7
1 changed files with 12 additions and 0 deletions
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12
src/gallium/auxiliary/vl/vl_vlc.h
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@ -338,4 +338,16 @@ vl_vlc_search_byte(struct vl_vlc *vlc, unsigned num_bits, uint8_t value)
}
}
/**
* remove num_bits bits starting at pos from the bitbuffer
*/
static INLINE void
vl_vlc_removebits(struct vl_vlc *vlc, unsigned pos, unsigned num_bits)
{
uint64_t lo = (vlc->buffer & (~0UL >> (pos + num_bits))) << num_bits;
uint64_t hi = (vlc->buffer & (~0UL << (64 - pos)));
vlc->buffer = lo | hi;
vlc->invalid_bits += num_bits;
}
#endif /* vl_vlc_h */