---
libavutil/common.h | 18 ++++++++++++++++++
1 files changed, 18 insertions(+), 0 deletions(-)
diff --git a/libavutil/common.h b/libavutil/common.h
index 7e93a1a..847b8d6 100644
--- a/libavutil/common.h
+++ b/libavutil/common.h
@@ -218,6 +218,21 @@ static av_always_inline av_const int
av_popcount_c(uint32_t x)
return (x + (x >> 16)) & 0x3F;
}
+/**
+ * Count number of bits set to one in x
+ * @param x value to count bits of
+ * @return the number of bits set to one in x
+ */
+static av_always_inline av_const int av_popcount64_c(uint64_t x)
+{
+ x -= ((x >> 1) & 0x5555555555555555);
+ x = (x & 0x3333333333333333) + ((x >> 2) & 0x3333333333333333);
+ x = (x + (x >> 4)) & 0x0F0F0F0F0F0F0F0F;
+ x = (x + (x >> 8)) & 0x00FF00FF00FF00FF;
+ x = (x + (x >> 16)) & 0x0000FFFF0000FFFF;
+ return (x + (x >> 32)) & 0x7F;
+}
+
#define MKTAG(a,b,c,d) ((a) | ((b) << 8) | ((c) << 16) | ((unsigned)(d) << 24))
#define MKBETAG(a,b,c,d) ((d) | ((c) << 8) | ((b) << 16) | ((unsigned)(a) <<
24))
@@ -383,3 +398,6 @@ static av_always_inline av_const int av_popcount_c(uint32_t
x)
#ifndef av_popcount
# define av_popcount av_popcount_c
#endif
+#ifndef av_popcount64
+# define av_popcount64 av_popcount64_c
+#endif
--
1.7.8
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