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34 lines
410 B
Go
34 lines
410 B
Go
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//+build !go1.9
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package fstests
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func leadingZeros64(x uint64) int {
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var n uint64 = 64
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if y := x >> 32; y != 0 {
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n = n - 32
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x = y
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}
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if y := x >> 16; y != 0 {
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n = n - 16
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x = y
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}
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if y := x >> 8; y != 0 {
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n = n - 8
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x = y
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}
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if y := x >> 4; y != 0 {
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n = n - 4
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x = y
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}
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if y := x >> 2; y != 0 {
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n = n - 2
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x = y
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}
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if y := x >> 1; y != 0 {
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return int(n - 2)
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}
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return int(n - x)
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}
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