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AOpCodeTable: Speed up instruction decoding (#284)

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This commit is contained in:
Merry 2018-07-19 06:32:37 +01:00 committed by gdkchan
parent 60f2198a1e
commit bdb6cbb435
1 changed files with 49 additions and 22 deletions
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71
ChocolArm64/AOpCodeTable.cs
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@ -4,6 +4,7 @@ using ChocolArm64.Instruction;
using ChocolArm64.Instruction32;
using ChocolArm64.State;
using System;
using System.Collections.Generic;
namespace ChocolArm64
{
@ -438,18 +439,43 @@ namespace ChocolArm64
SetA64("0>001110<<0xxxxx001110xxxxxxxxxx", AInstEmit.Zip1_V, typeof(AOpCodeSimdReg));
SetA64("0>001110<<0xxxxx011110xxxxxxxxxx", AInstEmit.Zip2_V, typeof(AOpCodeSimdReg));
#endregion
#region "Generate InstA64FastLookup Table (AArch64)"
var Tmp = new List<InstInfo>[FastLookupSize];
for (int i = 0; i < FastLookupSize; i++)
{
Tmp[i] = new List<InstInfo>();
}
foreach (var Inst in AllInstA64)
{
int Mask = ToFastLookupIndex(Inst.Mask);
int Value = ToFastLookupIndex(Inst.Value);
for (int i = 0; i < FastLookupSize; i++)
{
if ((i & Mask) == Value)
{
Tmp[i].Add(Inst);
}
}
}
for (int i = 0; i < FastLookupSize; i++)
{
InstA64FastLookup[i] = Tmp[i].ToArray();
}
#endregion
}
private class TreeNode
private class InstInfo
{
public int Mask;
public int Value;
public TreeNode Next;
public AInst Inst;
public TreeNode(int Mask, int Value, AInst Inst)
public InstInfo(int Mask, int Value, AInst Inst)
{
this.Mask = Mask;
this.Value = Value;
@ -457,8 +483,11 @@ namespace ChocolArm64
}
}
private static TreeNode InstHeadA32;
private static TreeNode InstHeadA64;
private static List<InstInfo> AllInstA32 = new List<InstInfo>();
private static List<InstInfo> AllInstA64 = new List<InstInfo>();
private static int FastLookupSize = 0x1000;
private static InstInfo[][] InstA64FastLookup = new InstInfo[FastLookupSize][];
private static void SetA32(string Encoding, AInstInterpreter Interpreter, Type Type)
{
@ -519,7 +548,7 @@ namespace ChocolArm64
if (XBits == 0)
{
InsertTop(XMask, Value, Inst, Mode);
InsertInst(XMask, Value, Inst, Mode);
return;
}
@ -535,55 +564,53 @@ namespace ChocolArm64
if (Mask != Blacklisted)
{
InsertTop(XMask, Value | Mask, Inst, Mode);
InsertInst(XMask, Value | Mask, Inst, Mode);
}
}
}
private static void InsertTop(
private static void InsertInst(
int XMask,
int Value,
AInst Inst,
AExecutionMode Mode)
{
TreeNode Node = new TreeNode(XMask, Value, Inst);
InstInfo Info = new InstInfo(XMask, Value, Inst);
if (Mode == AExecutionMode.AArch64)
{
Node.Next = InstHeadA64;
InstHeadA64 = Node;
AllInstA64.Add(Info);
}
else
{
Node.Next = InstHeadA32;
InstHeadA32 = Node;
AllInstA32.Add(Info);
}
}
public static AInst GetInstA32(int OpCode)
{
return GetInst(InstHeadA32, OpCode);
return GetInstFromList(AllInstA32, OpCode);
}
public static AInst GetInstA64(int OpCode)
{
return GetInst(InstHeadA64, OpCode);
return GetInstFromList(InstA64FastLookup[ToFastLookupIndex(OpCode)], OpCode);
}
private static AInst GetInst(TreeNode Head, int OpCode)
private static int ToFastLookupIndex(int Value)
{
TreeNode Node = Head;
return ((Value >> 10) & 0x00F) | ((Value >> 18) & 0xFF0);
}
do
private static AInst GetInstFromList(IEnumerable<InstInfo> InstList, int OpCode)
{
foreach (var Node in InstList)
{
if ((OpCode & Node.Mask) == Node.Value)
{
return Node.Inst;
}
}
while ((Node = Node.Next) != null);
return AInst.Undefined;
}