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JIT Sparse Function Table (#250)

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More up to date build of the JIT Sparse PR for continued development.
JIT Sparse Function Table was originally developed by riperiperi for the
original Ryujinx project, and decreased the amount of layers in the
Function Table structure, to decrease lookup times at the cost of
slightly higher RAM usage.
This PR rebalances the JIT Sparse Function Table to be a bit more RAM
intensive, but faster in workloads where the JIT Function Table is a
bottleneck. Faster RAM will see a bigger impact and slower RAM (DDR3 and
potentially slow DDR4) will see a slight performance decrease.
This PR also implements a base for a PPTC profile system that could
allow for PPTC with ExeFS mods enabled in the future.
This PR also potentially fixes a strange issue where Avalonia would time
out in some rare instances, e.g. when running ExeFS mods with TotK and a
strange controller configuration.

---------

Co-authored-by: Evan Husted <gr33m11@gmail.com>
This commit is contained in:
LotP1 2024-11-22 22:33:44 +01:00 • committed by GitHub
parent 5534001152
commit e653848a2c
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27 changed files with 990 additions and 327 deletions
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26
src/ARMeilleure/Instructions/InstEmitFlowHelper.cs
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@ -193,6 +193,8 @@ namespace ARMeilleure.Instructions
Operand hostAddress;
var table = context.FunctionTable;
// If address is mapped onto the function table, we can skip the table walk. Otherwise we fallback
// onto the dispatch stub.
if (guestAddress.Kind == OperandKind.Constant && context.FunctionTable.IsValid(guestAddress.Value))
@ -203,6 +205,30 @@ namespace ARMeilleure.Instructions
hostAddress = context.Load(OperandType.I64, hostAddressAddr);
}
else if (table.Sparse)
{
// Inline table lookup. Only enabled when the sparse function table is enabled with 2 levels.
// Deliberately attempts to avoid branches.
Operand tableBase = !context.HasPtc ?
Const(table.Base) :
Const(table.Base, Ptc.FunctionTableSymbol);
hostAddress = tableBase;
for (int i = 0; i < table.Levels.Length; i++)
{
var level = table.Levels[i];
int clearBits = 64 - (level.Index + level.Length);
Operand index = context.ShiftLeft(
context.ShiftRightUI(context.ShiftLeft(guestAddress, Const(clearBits)), Const(clearBits + level.Index)),
Const(3)
);
hostAddress = context.Load(OperandType.I64, context.Add(hostAddress, index));
}
}
else
{
hostAddress = !context.HasPtc ?