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Optimization (25% faster or so).

This commit is contained in:
jdpurcell 2015-01-17 03:55:41 +00:00
parent f1480740e3
commit f99338dc2e
1 changed files with 12 additions and 23 deletions
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35
BizHawk.Client.Common/rewind/Rewinder.cs
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@ -253,7 +253,7 @@ namespace BizHawk.Client.Common
stream.Write(currentState, 0, currentState.Length); stream.Write(currentState, 0, currentState.Length);
} }
private void CaptureRewindStateDelta(byte[] currentState, bool isSmall) private unsafe void CaptureRewindStateDelta(byte[] currentState, bool isSmall)
{ {
// in case the state sizes mismatch, capture a full state rather than trying to do anything clever // in case the state sizes mismatch, capture a full state rather than trying to do anything clever
if (currentState.Length != _lastState.Length) if (currentState.Length != _lastState.Length)
@ -278,8 +278,13 @@ namespace BizHawk.Client.Common
{ {
var writer = new BinaryWriter(ms); var writer = new BinaryWriter(ms);
writer.Write(false); // delta state writer.Write(false); // delta state
for (int i = 0; i < currentState.Length; i++) int stateLength = Math.Min(currentState.Length, _lastState.Length); // Just to be safe :)
fixed (byte* pCurrentState = &currentState[0])
fixed (byte* pLastState = &_lastState[0])
for (int i = 0; i < stateLength; i++)
{ {
bool thisByteMatches = *(pCurrentState + i) == *(pLastState + i);
if (inChangeSequence == false) if (inChangeSequence == false)
{ {
if (i >= _lastState.Length) if (i >= _lastState.Length)
@ -287,7 +292,7 @@ namespace BizHawk.Client.Common
continue; continue;
} }
if (currentState[i] == _lastState[i]) if (thisByteMatches)
{ {
continue; continue;
} }
@ -296,9 +301,10 @@ namespace BizHawk.Client.Common
beginChangeSequence = i; beginChangeSequence = i;
} }
if (i - beginChangeSequence == 254 || i == currentState.Length - 1) if (thisByteMatches || i - beginChangeSequence == 254 || i == currentState.Length - 1)
{ {
writer.Write((byte)(i - beginChangeSequence + 1)); int length = i - beginChangeSequence + (thisByteMatches ? 0 : 1);
writer.Write((byte)length);
if (isSmall) if (isSmall)
{ {
writer.Write((ushort)beginChangeSequence); writer.Write((ushort)beginChangeSequence);
@ -308,24 +314,7 @@ namespace BizHawk.Client.Common
writer.Write(beginChangeSequence); writer.Write(beginChangeSequence);
} }
writer.Write(_lastState, beginChangeSequence, i - beginChangeSequence + 1); writer.Write(_lastState, beginChangeSequence, length);
inChangeSequence = false;
continue;
}
if (currentState[i] == _lastState[i])
{
writer.Write((byte)(i - beginChangeSequence));
if (isSmall)
{
writer.Write((ushort)beginChangeSequence);
}
else
{
writer.Write(beginChangeSequence);
}
writer.Write(_lastState, beginChangeSequence, i - beginChangeSequence);
inChangeSequence = false; inChangeSequence = false;
} }
} }