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// Copyright 2023 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package rand_test
import (
. "math/rand/v2"
"testing"
)
func BenchmarkPCG_DXSM(b *testing.B) {
var p PCG
var t uint64
for n := b.N; n > 0; n-- {
t += p.Uint64()
}
Sink = t
}
func TestPCGMarshal(t *testing.T) {
var p PCG
const (
seed1 = 0x123456789abcdef0
seed2 = 0xfedcba9876543210
want = "pcg:\x12\x34\x56\x78\x9a\xbc\xde\xf0\xfe\xdc\xba\x98\x76\x54\x32\x10"
)
p.Seed(seed1, seed2)
data, err := p.MarshalBinary()
if string(data) != want || err != nil {
t.Errorf("MarshalBinary() = %q, %v, want %q, nil", data, err, want)
}
q := PCG{}
if err := q.UnmarshalBinary([]byte(want)); err != nil {
t.Fatalf("UnmarshalBinary(): %v", err)
}
if q != p {
t.Fatalf("after round trip, q = %#x, but p = %#x", q, p)
}
qu := q.Uint64()
pu := p.Uint64()
if qu != pu {
t.Errorf("after round trip, q.Uint64() = %#x, but p.Uint64() = %#x", qu, pu)
}
}
func TestPCG(t *testing.T) {
p := NewPCG(1, 2)
want := []uint64{
0xc4f5a58656eef510,
0x9dcec3ad077dec6c,
0xc8d04605312f8088,
0xcbedc0dcb63ac19a,
0x3bf98798cae97950,
0xa8c6d7f8d485abc,
0x7ffa3780429cd279,
0x730ad2626b1c2f8e,
0x21ff2330f4a0ad99,
0x2f0901a1947094b0,
0xa9735a3cfbe36cef,
0x71ddb0a01a12c84a,
0xf0e53e77a78453bb,
0x1f173e9663be1e9d,
0x657651da3ac4115e,
0xc8987376b65a157b,
0xbb17008f5fca28e7,
0x8232bd645f29ed22,
0x12be8f07ad14c539,
0x54908a48e8e4736e,
}
for i, x := range want {
if u := p.Uint64(); u != x {
t.Errorf("PCG #%d = %#x, want %#x", i, u, x)
}
}
}
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