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Improve shader global memory to storage pass (#2200)

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* Improve shader global memory to storage pass

* Formatting and more comments

* Shader cache version bump
This commit is contained in:
gdkchan 2021-04-18 07:31:39 -03:00 committed by GitHub
parent 7719909397
commit 40e276c9b5
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GPG key ID: 4AEE18F83AFDEB23
5 changed files with 158 additions and 129 deletions
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2
Ryujinx.Graphics.Gpu/Shader/ShaderCache.cs
View file

@ -35,7 +35,7 @@ namespace Ryujinx.Graphics.Gpu.Shader
/// <summary>
/// Version of the codegen (to be changed when codegen or guest format change).
/// </summary>
private const ulong ShaderCodeGenVersion = 2163;
private const ulong ShaderCodeGenVersion = 2200;
// Progress reporting helpers
private volatile int _shaderCount;

68
Ryujinx.Graphics.Shader/Translation/Optimizations/BindlessElimination.cs
View file

@ -5,66 +5,6 @@ namespace Ryujinx.Graphics.Shader.Translation.Optimizations
{
class BindlessElimination
{
private static Operation FindBranchSource(BasicBlock block)
{
foreach (BasicBlock sourceBlock in block.Predecessors)
{
if (sourceBlock.Operations.Count > 0)
{
Operation lastOp = sourceBlock.Operations.Last.Value as Operation;
if (lastOp != null &&
((sourceBlock.Next == block && lastOp.Inst == Instruction.BranchIfFalse) ||
(sourceBlock.Branch == block && lastOp.Inst == Instruction.BranchIfTrue)))
{
return lastOp;
}
}
}
return null;
}
private static bool BlockConditionsMatch(BasicBlock currentBlock, BasicBlock queryBlock)
{
// Check if all the conditions for the query block are satisfied by the current block.
// Just checks the top-most conditional for now.
Operation currentBranch = FindBranchSource(currentBlock);
Operation queryBranch = FindBranchSource(queryBlock);
Operand currentCondition = currentBranch?.GetSource(0);
Operand queryCondition = queryBranch?.GetSource(0);
// The condition should be the same operand instance.
return currentBranch != null && queryBranch != null &&
currentBranch.Inst == queryBranch.Inst &&
currentCondition == queryCondition;
}
private static Operand FindLastOperation(Operand source, BasicBlock block)
{
if (source.AsgOp is PhiNode phiNode)
{
// This source can have a different value depending on a previous branch.
// Ensure that conditions met for that branch are also met for the current one.
// Prefer the latest sources for the phi node.
for (int i = phiNode.SourcesCount - 1; i >= 0; i--)
{
BasicBlock phiBlock = phiNode.GetBlock(i);
if (BlockConditionsMatch(block, phiBlock))
{
return phiNode.GetSource(i);
}
}
}
return source;
}
public static void RunPass(BasicBlock block, ShaderConfig config)
{
// We can turn a bindless into regular access by recognizing the pattern
@ -89,7 +29,7 @@ namespace Ryujinx.Graphics.Shader.Translation.Optimizations
texOp.Inst == Instruction.TextureSample ||
texOp.Inst == Instruction.TextureSize)
{
Operand bindlessHandle = FindLastOperation(texOp.GetSource(0), block);
Operand bindlessHandle = Utils.FindLastOperation(texOp.GetSource(0), block);
if (bindlessHandle.Type == OperandType.ConstantBuffer)
{
@ -107,8 +47,8 @@ namespace Ryujinx.Graphics.Shader.Translation.Optimizations
continue;
}
Operand src0 = FindLastOperation(handleCombineOp.GetSource(0), block);
Operand src1 = FindLastOperation(handleCombineOp.GetSource(1), block);
Operand src0 = Utils.FindLastOperation(handleCombineOp.GetSource(0), block);
Operand src1 = Utils.FindLastOperation(handleCombineOp.GetSource(1), block);
if (src0.Type != OperandType.ConstantBuffer ||
src1.Type != OperandType.ConstantBuffer || src0.GetCbufSlot() != src1.GetCbufSlot())
@ -120,7 +60,7 @@ namespace Ryujinx.Graphics.Shader.Translation.Optimizations
}
else if (texOp.Inst == Instruction.ImageLoad || texOp.Inst == Instruction.ImageStore)
{
Operand src0 = FindLastOperation(texOp.GetSource(0), block);
Operand src0 = Utils.FindLastOperation(texOp.GetSource(0), block);
if (src0.Type == OperandType.ConstantBuffer)
{

118
Ryujinx.Graphics.Shader/Translation/Optimizations/GlobalToStorage.cs
View file

@ -25,32 +25,29 @@ namespace Ryujinx.Graphics.Shader.Translation.Optimizations
{
Operand source = operation.GetSource(0);
if (source.AsgOp is Operation asgOperation)
int storageIndex = SearchForStorageBase(block, source, sbStart, sbEnd);
if (storageIndex >= 0)
{
int storageIndex = SearchForStorageBase(asgOperation, sbStart, sbEnd);
// Storage buffers are implemented using global memory access.
// If we know from where the base address of the access is loaded,
// we can guess which storage buffer it is accessing.
// We can then replace the global memory access with a storage
// buffer access.
node = ReplaceGlobalWithStorage(node, config, storageIndex);
}
else if (config.Stage == ShaderStage.Compute && operation.Inst == Instruction.LoadGlobal)
{
// Here we effectively try to replace a LDG instruction with LDC.
// The hardware only supports a limited amount of constant buffers
// so NVN "emulates" more constant buffers using global memory access.
// Here we try to replace the global access back to a constant buffer
// load.
storageIndex = SearchForStorageBase(block, source, UbeBaseOffset, UbeBaseOffset + UbeDescsSize);
if (storageIndex >= 0)
{
// Storage buffers are implemented using global memory access.
// If we know from where the base address of the access is loaded,
// we can guess which storage buffer it is accessing.
// We can then replace the global memory access with a storage
// buffer access.
node = ReplaceGlobalWithStorage(node, config, storageIndex);
}
else if (config.Stage == ShaderStage.Compute && operation.Inst == Instruction.LoadGlobal)
{
// Here we effectively try to replace a LDG instruction with LDC.
// The hardware only supports a limited amount of constant buffers
// so NVN "emulates" more constant buffers using global memory access.
// Here we try to replace the global access back to a constant buffer
// load.
storageIndex = SearchForStorageBase(asgOperation, UbeBaseOffset, UbeBaseOffset + UbeDescsSize);
if (storageIndex >= 0)
{
node = ReplaceLdgWithLdc(node, config, storageIndex);
}
node = ReplaceLdgWithLdc(node, config, storageIndex);
}
}
}
@ -184,35 +181,70 @@ namespace Ryujinx.Graphics.Shader.Translation.Optimizations
return node;
}
private static int SearchForStorageBase(Operation operation, int sbStart, int sbEnd)
private static int SearchForStorageBase(BasicBlock block, Operand globalAddress, int sbStart, int sbEnd)
{
Queue<Operation> assignments = new Queue<Operation>();
globalAddress = Utils.FindLastOperation(globalAddress, block);
assignments.Enqueue(operation);
while (assignments.TryDequeue(out operation))
if (globalAddress.Type == OperandType.ConstantBuffer)
{
for (int index = 0; index < operation.SourcesCount; index++)
return GetStorageIndex(globalAddress, sbStart, sbEnd);
}
Operation operation = globalAddress.AsgOp as Operation;
if (operation == null || operation.Inst != Instruction.Add)
{
return -1;
}
Operand src1 = operation.GetSource(0);
Operand src2 = operation.GetSource(1);
if ((src1.Type == OperandType.LocalVariable && src2.Type == OperandType.Constant) ||
(src2.Type == OperandType.LocalVariable && src1.Type == OperandType.Constant))
{
if (src1.Type == OperandType.LocalVariable)
{
Operand source = operation.GetSource(index);
operation = Utils.FindLastOperation(src1, block).AsgOp as Operation;
}
else
{
operation = Utils.FindLastOperation(src2, block).AsgOp as Operation;
}
if (source.Type == OperandType.ConstantBuffer)
{
int slot = source.GetCbufSlot();
int offset = source.GetCbufOffset();
if (operation == null || operation.Inst != Instruction.Add)
{
return -1;
}
}
if (slot == 0 && offset >= sbStart && offset < sbEnd)
{
int storageIndex = (offset - sbStart) / StorageDescSize;
for (int index = 0; index < operation.SourcesCount; index++)
{
Operand source = operation.GetSource(index);
return storageIndex;
}
}
int storageIndex = GetStorageIndex(source, sbStart, sbEnd);
if (source.AsgOp is Operation asgOperation)
{
assignments.Enqueue(asgOperation);
}
if (storageIndex != -1)
{
return storageIndex;
}
}
return -1;
}
private static int GetStorageIndex(Operand operand, int sbStart, int sbEnd)
{
if (operand.Type == OperandType.ConstantBuffer)
{
int slot = operand.GetCbufSlot();
int offset = operand.GetCbufOffset();
if (slot == 0 && offset >= sbStart && offset < sbEnd)
{
int storageIndex = (offset - sbStart) / StorageDescSize;
return storageIndex;
}
}

32
Ryujinx.Graphics.Shader/Translation/Optimizations/Optimizer.cs
View file

@ -10,11 +10,22 @@ namespace Ryujinx.Graphics.Shader.Translation.Optimizations
{
public static void RunPass(BasicBlock[] blocks, ShaderConfig config)
{
RunOptimizationPasses(blocks);
// Those passes are looking for specific patterns and only needs to run once.
for (int blkIndex = 0; blkIndex < blocks.Length; blkIndex++)
{
GlobalToStorage.RunPass(blocks[blkIndex], config);
BindlessToIndexed.RunPass(blocks[blkIndex]);
BindlessElimination.RunPass(blocks[blkIndex], config);
}
// Run optimizations one last time to remove any code that is now optimizable after above passes.
RunOptimizationPasses(blocks);
}
private static void RunOptimizationPasses(BasicBlock[] blocks)
{
bool modified;
do
@ -85,27 +96,6 @@ namespace Ryujinx.Graphics.Shader.Translation.Optimizations
}
}
while (modified);
for (int blkIndex = 0; blkIndex < blocks.Length; blkIndex++)
{
BindlessToIndexed.RunPass(blocks[blkIndex]);
BindlessElimination.RunPass(blocks[blkIndex], config);
// Try to eliminate any operations that are now unused.
LinkedListNode<INode> node = blocks[blkIndex].Operations.First;
while (node != null)
{
LinkedListNode<INode> nextNode = node.Next;
if (IsUnused(node.Value))
{
RemoveNode(blocks[blkIndex], node);
}
node = nextNode;
}
}
}
private static void PropagateCopy(Operation copyOp)

67
Ryujinx.Graphics.Shader/Translation/Optimizations/Utils.cs Normal file
View file

@ -0,0 +1,67 @@
using Ryujinx.Graphics.Shader.IntermediateRepresentation;
namespace Ryujinx.Graphics.Shader.Translation.Optimizations
{
static class Utils
{
private static Operation FindBranchSource(BasicBlock block)
{
foreach (BasicBlock sourceBlock in block.Predecessors)
{
if (sourceBlock.Operations.Count > 0)
{
Operation lastOp = sourceBlock.Operations.Last.Value as Operation;
if (lastOp != null &&
((sourceBlock.Next == block && lastOp.Inst == Instruction.BranchIfFalse) ||
(sourceBlock.Branch == block && lastOp.Inst == Instruction.BranchIfTrue)))
{
return lastOp;
}
}
}
return null;
}
private static bool BlockConditionsMatch(BasicBlock currentBlock, BasicBlock queryBlock)
{
// Check if all the conditions for the query block are satisfied by the current block.
// Just checks the top-most conditional for now.
Operation currentBranch = FindBranchSource(currentBlock);
Operation queryBranch = FindBranchSource(queryBlock);
Operand currentCondition = currentBranch?.GetSource(0);
Operand queryCondition = queryBranch?.GetSource(0);
// The condition should be the same operand instance.
return currentBranch != null && queryBranch != null &&
currentBranch.Inst == queryBranch.Inst &&
currentCondition == queryCondition;
}
public static Operand FindLastOperation(Operand source, BasicBlock block)
{
if (source.AsgOp is PhiNode phiNode)
{
// This source can have a different value depending on a previous branch.
// Ensure that conditions met for that branch are also met for the current one.
// Prefer the latest sources for the phi node.
for (int i = phiNode.SourcesCount - 1; i >= 0; i--)
{
BasicBlock phiBlock = phiNode.GetBlock(i);
if (BlockConditionsMatch(block, phiBlock))
{
return phiNode.GetSource(i);
}
}
}
return source;
}
}
}