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mono-jit

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- fix alignment issue with jitcache that could cause a crash.
- Reimplement sparse-jit to only use 1 layer.
    - the old 2 layer approach basically only ever used 1 path due to the bottom-layer size, so doing a double look-up seemed wasteful.
    - changed memory block allocation stategy to allocate based on requested code range instead of the possible address-space.

Co-authored-by: LotP1 <68976644+LotP1@users.noreply.github.com>
This commit is contained in:
LotP
2026-07-10 10:03:48 -05:00
committed by KeatonTheBot
co-authored by LotP1
parent b362f837c5
commit 6c47892b94
8 changed files with 89 additions and 97 deletions
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src/ARMeilleure/Instructions/InstEmitFlowHelper.cs
+9 -12
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@@ -5,7 +5,7 @@ using ARMeilleure.IntermediateRepresentation;
using ARMeilleure.State;
using ARMeilleure.Translation;
using ARMeilleure.Translation.PTC;
using System.Linq;
using static ARMeilleure.Instructions.InstEmitHelper;
using static ARMeilleure.IntermediateRepresentation.Operand.Factory;
@@ -238,7 +238,7 @@ namespace ARMeilleure.Instructions
}
else if (table.Sparse)
{
// Inline table lookup. Only enabled when the sparse function table is enabled with 2 levels.
// Inline table lookup. Only enabled when the sparse function table is enabled with 1 level.
// Deliberately attempts to avoid branches.
Operand tableBase = !context.HasPtc ?
@@ -247,18 +247,15 @@ namespace ARMeilleure.Instructions
hostAddress = tableBase;
for (int i = 0; i < table.Levels.Length; i++)
{
AddressTableLevel level = table.Levels[i];
int clearBits = 64 - (level.Index + level.Length);
AddressTableLevel level = table.Levels.Last();
int clearBits = 64 - (level.Index + level.Length);
Operand index = context.ShiftLeft(
context.ShiftRightUI(context.ShiftLeft(guestAddress, Const(clearBits)), Const(clearBits + level.Index)),
Const(3)
);
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));
}
hostAddress = context.Load(OperandType.I64, context.Add(hostAddress, index));
}
else
{