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Use non-copyleft RNG implementation (#51448)
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Using xorshiro128** because it is already used in the project, and licensed under CC0.
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@KevinCathcart
KevinCathcart authored May 1, 2021
1 parent bad6ea0 commit d2fba8f
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18 changes: 6 additions & 12 deletions THIRD-PARTY-NOTICES.TXT
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Expand Up @@ -669,22 +669,16 @@ ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

License notice for Xorshift RNGs
License notice for xoshiro RNGs
--------------------------------

George Marsaglia
2003-07-04
Journal of Statistical Software
License: http://creativecommons.org/licenses/by/3.0/
Written in 2018 by David Blackman and Sebastiano Vigna (vigna@acm.org)

https://www.jstatsoft.org/article/view/v008i14
https://www.jstatsoft.org/index.php/jss/article/view/v008i14/xorshift.pdf
To the extent possible under law, the author has dedicated all copyright
and related and neighboring rights to this software to the public domain
worldwide. This software is distributed without any warranty.

License notice for Xorshift (Wikipedia)
---------------------------------------

https://en.wikipedia.org/wiki/Xorshift
License: https://en.wikipedia.org/wiki/Wikipedia:Text_of_Creative_Commons_Attribution-ShareAlike_3.0_Unported_License
See <http://creativecommons.org/publicdomain/zero/1.0/>.

License for fastmod (https://github.com/lemire/fastmod)
--------------------------------------
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27 changes: 16 additions & 11 deletions ...Compiler.ReadyToRun/Compiler/DependencyAnalysis/ReadyToRun/AttributePresenceFilterNode.cs
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Expand Up @@ -5,6 +5,7 @@
using System.Collections.Generic;
using System.Collections.Immutable;
using System.Diagnostics;
using System.Numerics;
using System.Reflection.Metadata;
using System.Reflection.Metadata.Ecma335;

Expand Down Expand Up @@ -280,16 +281,20 @@ private void GetTypeNameFromTypeDefinitionHandle(TypeDefinitionHandle typeDefini
typeName = _module.MetadataReader.GetString(typeNameHandle);
}

// Algorithm "xor128" from p. 5 of Marsaglia, "Xorshift RNGs"
private uint XorShift128(uint[] state)
internal uint Xoshiro128StarStar(uint[] s)
{
uint s, t = state[3];
state[3] = state[2];
state[2] = state[1];
state[1] = s = state[0];
t ^= t << 11;
t ^= t >> 8;
return state[0] = t ^ s ^ (s >> 19);
uint result = BitOperations.RotateLeft(s[1] * 5, 7) * 9;
uint t = s[1] << 9;

s[2] ^= s[0];
s[3] ^= s[1];
s[1] ^= s[2];
s[0] ^= s[3];

s[2] ^= t;
s[3] = BitOperations.RotateLeft(s[3], 11);

return result;
}

public override ObjectData GetData(NodeFactory factory, bool relocsOnly = false)
Expand Down Expand Up @@ -341,7 +346,7 @@ public override ObjectData GetData(NodeFactory factory, bool relocsOnly = false)
uint fingerprintHash = (uint)fingerprint;
uint bucketBIndex = (bucketAIndex ^ (fingerprintHash % bucketCount));
Debug.Assert(bucketAIndex == (bucketBIndex ^ (fingerprintHash % bucketCount)));
if ((XorShift128(state) & 1) != 0) // Randomly choose which bucket to attempt to fill first
if ((Xoshiro128StarStar(state) & 1) != 0) // Randomly choose which bucket to attempt to fill first
{
uint temp = bucketAIndex;
bucketAIndex = bucketBIndex;
Expand Down Expand Up @@ -406,7 +411,7 @@ public override ObjectData GetData(NodeFactory factory, bool relocsOnly = false)
for (int n = 0; !success && n < MaxNumKicks; n++)
{
// Randomly swap an entry in bucket bucketAIndex with fingerprint
uint entryIndexInBucket = XorShift128(state) & 0x7;
uint entryIndexInBucket = Xoshiro128StarStar(state) & 0x7;
ushort temp = fingerprint;
fingerprint = pTable[(bucketAIndex * 8) + entryIndexInBucket];
pTable[(bucketAIndex * 8) + entryIndexInBucket] = temp;
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31 changes: 19 additions & 12 deletions src/coreclr/zap/zapreadytorun.cpp
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Expand Up @@ -563,16 +563,23 @@ HRESULT EnumerateAllCustomAttributes(IMDInternalImport *pMDImport, Tlambda lambd
return hr;
}

uint32_t xorshift128(uint32_t state[4])
{
/* Algorithm "xor128" from p. 5 of Marsaglia, "Xorshift RNGs" */
uint32_t s, t = state[3];
state[3] = state[2];
state[2] = state[1];
state[1] = s = state[0];
t ^= t << 11;
t ^= t >> 8;
return state[0] = t ^ s ^ (s >> 19);
static inline uint32_t RotateLeft(const uint32_t x, int k) {
return (x << k) | (x >> (32 - k));
}

uint32_t Xoshiro128StarStar(uint32_t s[]) {
const uint32_t result = RotateLeft(s[1] * 5, 7) * 9;
const uint32_t t = s[1] << 9;

s[2] ^= s[0];
s[3] ^= s[1];
s[1] ^= s[2];
s[0] ^= s[3];

s[2] ^= t;
s[3] = RotateLeft(s[3], 11);

return result;
}

HRESULT ZapImage::ComputeAttributePresenceTable(IMDInternalImport * pMDImport, SArray<UINT16> *table)
Expand Down Expand Up @@ -639,7 +646,7 @@ HRESULT ZapImage::ComputeAttributePresenceTable(IMDInternalImport * pMDImport, S

_ASSERTE(bucketAIndex == (bucketBIndex ^ (NativeFormat::NativeCuckooFilter::ComputeFingerprintHash(fingerprint) % bucketCount)));

if (xorshift128(state) & 1) // Randomly choose which bucket to attempt to fill first
if (Xoshiro128StarStar(state) & 1) // Randomly choose which bucket to attempt to fill first
{
UINT temp = bucketAIndex;
bucketAIndex = bucketBIndex;
Expand Down Expand Up @@ -701,7 +708,7 @@ HRESULT ZapImage::ComputeAttributePresenceTable(IMDInternalImport * pMDImport, S
for (int n = 0; n < MaxNumKicks; n++)
{
// Randomly swap an entry in bucket bucketAIndex with fingerprint
UINT entryIndexInBucket = xorshift128(state) & 0x7;
UINT entryIndexInBucket = Xoshiro128StarStar(state) & 0x7;
UINT16 temp = fingerprint;
fingerprint = (*table)[(bucketAIndex * 8) + entryIndexInBucket];
(*table)[(bucketAIndex * 8) + entryIndexInBucket] = temp;
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18 changes: 6 additions & 12 deletions src/installer/pkg/THIRD-PARTY-NOTICES.TXT
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Expand Up @@ -668,22 +668,16 @@ ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

License notice for Xorshift RNGs
License notice for xoshiro RNGs
--------------------------------

George Marsaglia
2003-07-04
Journal of Statistical Software
License: http://creativecommons.org/licenses/by/3.0/
Written in 2018 by David Blackman and Sebastiano Vigna (vigna@acm.org)

https://www.jstatsoft.org/article/view/v008i14
https://www.jstatsoft.org/index.php/jss/article/view/v008i14/xorshift.pdf
To the extent possible under law, the author has dedicated all copyright
and related and neighboring rights to this software to the public domain
worldwide. This software is distributed without any warranty.

License notice for Xorshift (Wikipedia)
---------------------------------------

https://en.wikipedia.org/wiki/Xorshift
License: https://en.wikipedia.org/wiki/Wikipedia:Text_of_Creative_Commons_Attribution-ShareAlike_3.0_Unported_License
See <http://creativecommons.org/publicdomain/zero/1.0/>.

License for fastmod (https://github.com/lemire/fastmod)
--------------------------------------
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