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30 lines
757 B
Go
30 lines
757 B
Go
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package bitutil
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// Abs8 returns the absolute value of i (calculated without branching).
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func Abs8(i int8) int8 {
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const bits = 8
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u := uint64(i >> (bits - 1))
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return (i ^ int8(u)) + int8(u&1)
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}
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// Abs16 returns the absolute value of i (calculated without branching).
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func Abs16(i int16) int16 {
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const bits = 16
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u := uint64(i >> (bits - 1))
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return (i ^ int16(u)) + int16(u&1)
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}
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// Abs32 returns the absolute value of i (calculated without branching).
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func Abs32(i int32) int32 {
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const bits = 32
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u := uint64(i >> (bits - 1))
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return (i ^ int32(u)) + int32(u&1)
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}
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// Abs64 returns the absolute value of i (calculated without branching).
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func Abs64(i int64) int64 {
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const bits = 64
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u := uint64(i >> (bits - 1))
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return (i ^ int64(u)) + int64(u&1)
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}
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