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rand: add methods to allow greater control over PCGSource #30

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rand: add methods to allow greater control over PCGSource #30

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20a3031
rand: add methods to allow greater control over `PCGSource`
DeedleFake Apr 5, 2022
776a471
rand: rename `PCGSource.PCG` to `PCGSource.State`
DeedleFake Apr 6, 2022
7f2d908
rand: rename `PCGSource.Seed64` to `PCGSource.Seed128`
DeedleFake Apr 18, 2022
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11 changes: 11 additions & 0 deletions rand/rng.go
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Original file line number Diff line number Diff line change
Expand Up @@ -58,6 +58,17 @@ func (pcg *PCGSource) Uint64() uint64 {
return bits.RotateLeft64(pcg.high^pcg.low, -int(pcg.high>>58))
}

// Seed128 sets both the high and low bits of the generator state to the provided values.
func (pcg *PCGSource) Seed128(high, low uint64) {
pcg.high = high
pcg.low = low
}

// State returns the high and low bits of the generator state.
func (pcg *PCGSource) State() (high, low uint64) {
return pcg.high, pcg.low
}

func (pcg *PCGSource) add() {
var carry uint64
pcg.low, carry = bits.Add64(pcg.low, incLow, 0)
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