[Mesa-dev] [PATCH v3 11/12] gallium/util: Add u_bit_scan_consecutive_range64.
Bas Nieuwenhuizen
bas at basnieuwenhuizen.nl
Tue Apr 19 09:58:04 UTC 2016
For use by radeonsi.
v2: Make sure that it works for all 64 bits set.
Signed-off-by: Bas Nieuwenhuizen <bas at basnieuwenhuizen.nl>
Reviewed-by: Marek Olšák <marek.olsak at amd.com>
---
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 d983af3..10f158b 100644
--- a/src/gallium/auxiliary/util/u_math.h
+++ b/src/gallium/auxiliary/util/u_math.h
@@ -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.
*/
--
2.8.0
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