ShuriZma
/
BizHawk
mirror of https://github.com/TASEmulators/BizHawk.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

35
BizHawk.Client.Common/rewind/Rewinder.cs
View File

@ -253,7 +253,7 @@ namespace BizHawk.Client.Common
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
if (currentState.Length != _lastState.Length)
@ -278,8 +278,13 @@ namespace BizHawk.Client.Common
{
var writer = new BinaryWriter(ms);
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 (i >= _lastState.Length)
@ -287,7 +292,7 @@ namespace BizHawk.Client.Common
continue;
}
if (currentState[i] == _lastState[i])
if (thisByteMatches)
{
continue;
}
@ -296,9 +301,10 @@ namespace BizHawk.Client.Common
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)
{
writer.Write((ushort)beginChangeSequence);
@ -308,24 +314,7 @@ namespace BizHawk.Client.Common
writer.Write(beginChangeSequence);
}
writer.Write(_lastState, beginChangeSequence, i - beginChangeSequence + 1);
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);
writer.Write(_lastState, beginChangeSequence, length);
inChangeSequence = false;
}
}