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Improve shader BRX instruction code generation (#3759)

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* Improve shader BRX instruction code generation

* Shader cache version bump, add some comments and asserts
This commit is contained in:
gdkchan 2022-10-15 20:20:16 -03:00 committed by GitHub
parent e43390c723
commit 2df16ded9b
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GPG Key ID: 4AEE18F83AFDEB23
5 changed files with 140 additions and 24 deletions
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2
Ryujinx.Graphics.Gpu/Shader/DiskCache/DiskCacheHostStorage.cs
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@ -22,7 +22,7 @@ namespace Ryujinx.Graphics.Gpu.Shader.DiskCache
private const ushort FileFormatVersionMajor = 1;
private const ushort FileFormatVersionMinor = 2;
private const uint FileFormatVersionPacked = ((uint)FileFormatVersionMajor << 16) | FileFormatVersionMinor;
private const uint CodeGenVersion = 3732;
private const uint CodeGenVersion = 3759;
private const string SharedTocFileName = "shared.toc";
private const string SharedDataFileName = "shared.data";

13
Ryujinx.Graphics.Shader/Decoders/Decoder.cs
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@ -377,6 +377,8 @@ namespace Ryujinx.Graphics.Shader.Decoders
if (lastOp.Name == InstName.Brx && block.Successors.Count == (hasNext ? 1 : 0))
{
HashSet<ulong> visited = new HashSet<ulong>();
InstBrx opBrx = new InstBrx(lastOp.RawOpCode);
ulong baseOffset = lastOp.GetAbsoluteAddress();
@ -392,9 +394,14 @@ namespace Ryujinx.Graphics.Shader.Decoders
for (int i = 0; i < cbOffsetsCount; i++)
{
uint targetOffset = config.ConstantBuffer1Read(cbBaseOffset + i * 4);
Block target = getBlock(baseOffset + targetOffset);
target.Predecessors.Add(block);
block.Successors.Add(target);
ulong targetAddress = baseOffset + targetOffset;
if (visited.Add(targetAddress))
{
Block target = getBlock(targetAddress);
target.Predecessors.Add(block);
block.Successors.Add(target);
}
}
}
}

82
Ryujinx.Graphics.Shader/Instructions/InstEmitFlowControl.cs
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@ -41,24 +41,82 @@ namespace Ryujinx.Graphics.Shader.Instructions
Operand address = context.IAdd(Register(op.SrcA, RegisterType.Gpr), Const(offset));
// Sorting the target addresses in descending order improves the code,
// since it will always check the most distant targets first, then the
// near ones. This can be easily transformed into if/else statements.
var sortedTargets = context.CurrBlock.Successors.Skip(startIndex).OrderByDescending(x => x.Address);
var targets = context.CurrBlock.Successors.Skip(startIndex);
Block lastTarget = sortedTargets.LastOrDefault();
bool allTargetsSinglePred = true;
int total = context.CurrBlock.Successors.Count - startIndex;
int count = 0;
foreach (Block possibleTarget in sortedTargets)
foreach (var target in targets.OrderBy(x => x.Address))
{
Operand label = context.GetLabel(possibleTarget.Address);
if (possibleTarget != lastTarget)
if (++count < total && (target.Predecessors.Count > 1 || target.Address <= context.CurrBlock.Address))
{
context.BranchIfTrue(label, context.ICompareEqual(address, Const((int)possibleTarget.Address)));
allTargetsSinglePred = false;
break;
}
else
}
if (allTargetsSinglePred)
{
// Chain blocks, each target block will check if the BRX target address
// matches its own address, if not, it jumps to the next target which will do the same check,
// until it reaches the last possible target, which executed unconditionally.
// We can only do this if the BRX block is the only predecessor of all target blocks.
// Additionally, this is not supported for blocks located before the current block,
// since it will be too late to insert a label, but this is something that can be improved
// in the future if necessary.
var sortedTargets = targets.OrderBy(x => x.Address);
Block currentTarget = null;
ulong firstTargetAddress = 0;
foreach (Block nextTarget in sortedTargets)
{
context.Branch(label);
if (currentTarget != null)
{
if (currentTarget.Address != nextTarget.Address)
{
context.SetBrxTarget(currentTarget.Address, address, (int)currentTarget.Address, nextTarget.Address);
}
}
else
{
firstTargetAddress = nextTarget.Address;
}
currentTarget = nextTarget;
}
context.Branch(context.GetLabel(firstTargetAddress));
}
else
{
// Emit the branches sequentially.
// This generates slightly worse code, but should work for all cases.
var sortedTargets = targets.OrderByDescending(x => x.Address);
ulong lastTargetAddress = ulong.MaxValue;
count = 0;
foreach (Block target in sortedTargets)
{
Operand label = context.GetLabel(target.Address);
if (++count < total)
{
if (target.Address != lastTargetAddress)
{
context.BranchIfTrue(label, context.ICompareEqual(address, Const((int)target.Address)));
}
lastTargetAddress = target.Address;
}
else
{
context.Branch(label);
}
}
}
}

65
Ryujinx.Graphics.Shader/Translation/EmitterContext.cs
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@ -21,8 +21,33 @@ namespace Ryujinx.Graphics.Shader.Translation
public int OperationsCount => _operations.Count;
private struct BrxTarget
{
public readonly Operand Selector;
public readonly int ExpectedValue;
public readonly ulong NextTargetAddress;
public BrxTarget(Operand selector, int expectedValue, ulong nextTargetAddress)
{
Selector = selector;
ExpectedValue = expectedValue;
NextTargetAddress = nextTargetAddress;
}
}
private class BlockLabel
{
public readonly Operand Label;
public BrxTarget BrxTarget;
public BlockLabel(Operand label)
{
Label = label;
}
}
private readonly List<Operation> _operations;
private readonly Dictionary<ulong, Operand> _labels;
private readonly Dictionary<ulong, BlockLabel> _labels;
public EmitterContext(DecodedProgram program, ShaderConfig config, bool isNonMain)
{
@ -30,7 +55,7 @@ namespace Ryujinx.Graphics.Shader.Translation
Config = config;
IsNonMain = isNonMain;
_operations = new List<Operation>();
_labels = new Dictionary<ulong, Operand>();
_labels = new Dictionary<ulong, BlockLabel>();
EmitStart();
}
@ -158,14 +183,40 @@ namespace Ryujinx.Graphics.Shader.Translation
public Operand GetLabel(ulong address)
{
if (!_labels.TryGetValue(address, out Operand label))
{
label = Label();
return EnsureBlockLabel(address).Label;
}
_labels.Add(address, label);
public void SetBrxTarget(ulong address, Operand selector, int targetValue, ulong nextTargetAddress)
{
BlockLabel blockLabel = EnsureBlockLabel(address);
Debug.Assert(blockLabel.BrxTarget.Selector == null);
blockLabel.BrxTarget = new BrxTarget(selector, targetValue, nextTargetAddress);
}
public void EnterBlock(ulong address)
{
BlockLabel blockLabel = EnsureBlockLabel(address);
MarkLabel(blockLabel.Label);
BrxTarget brxTarget = blockLabel.BrxTarget;
if (brxTarget.Selector != null)
{
this.BranchIfFalse(GetLabel(brxTarget.NextTargetAddress), this.ICompareEqual(brxTarget.Selector, Const(brxTarget.ExpectedValue)));
}
}
private BlockLabel EnsureBlockLabel(ulong address)
{
if (!_labels.TryGetValue(address, out BlockLabel blockLabel))
{
blockLabel = new BlockLabel(Label());
_labels.Add(address, blockLabel);
}
return label;
return blockLabel;
}
public void PrepareForVertexReturn()

2
Ryujinx.Graphics.Shader/Translation/Translator.cs
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@ -162,7 +162,7 @@ namespace Ryujinx.Graphics.Shader.Translation
{
context.CurrBlock = block;
context.MarkLabel(context.GetLabel(block.Address));
context.EnterBlock(block.Address);
EmitOps(context, block);
}