diff options
Diffstat (limited to 'vendor/github.com/willf/bitset/trailing_zeros_18.go')
| -rw-r--r-- | vendor/github.com/willf/bitset/trailing_zeros_18.go | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/vendor/github.com/willf/bitset/trailing_zeros_18.go b/vendor/github.com/willf/bitset/trailing_zeros_18.go new file mode 100644 index 0000000000..c52b61be9f --- /dev/null +++ b/vendor/github.com/willf/bitset/trailing_zeros_18.go @@ -0,0 +1,14 @@ +// +build !go1.9 + +package bitset + +var deBruijn = [...]byte{ + 0, 1, 56, 2, 57, 49, 28, 3, 61, 58, 42, 50, 38, 29, 17, 4, + 62, 47, 59, 36, 45, 43, 51, 22, 53, 39, 33, 30, 24, 18, 12, 5, + 63, 55, 48, 27, 60, 41, 37, 16, 46, 35, 44, 21, 52, 32, 23, 11, + 54, 26, 40, 15, 34, 20, 31, 10, 25, 14, 19, 9, 13, 8, 7, 6, +} + +func trailingZeroes64(v uint64) uint { + return uint(deBruijn[((v&-v)*0x03f79d71b4ca8b09)>>58]) +} |