Ryujinx/Ryujinx.Graphics.Shader/Translation/Optimizations/GlobalToStorage.cs

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using Ryujinx.Graphics.Shader.IntermediateRepresentation;
using System.Collections.Generic;
using static Ryujinx.Graphics.Shader.IntermediateRepresentation.OperandHelper;
using static Ryujinx.Graphics.Shader.Translation.GlobalMemory;
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namespace Ryujinx.Graphics.Shader.Translation.Optimizations
{
static class GlobalToStorage
{
public static void RunPass(BasicBlock block, ShaderConfig config)
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{
int sbStart = GetStorageBaseCbOffset(config.Stage);
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int sbEnd = sbStart + StorageDescsSize;
for (LinkedListNode<INode> node = block.Operations.First; node != null; node = node.Next)
{
if (!(node.Value is Operation operation))
{
continue;
}
if (UsesGlobalMemory(operation.Inst))
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{
Operand source = operation.GetSource(0);
int storageIndex = SearchForStorageBase(block, source, sbStart, sbEnd);
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(block, node, config, storageIndex);
}
else if (config.Stage == ShaderStage.Compute && operation.Inst == Instruction.LoadGlobal)
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{
// 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);
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if (storageIndex >= 0)
{
node = ReplaceLdgWithLdc(node, config, storageIndex);
}
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}
}
}
}
private static LinkedListNode<INode> ReplaceGlobalWithStorage(BasicBlock block, LinkedListNode<INode> node, ShaderConfig config, int storageIndex)
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{
Operation operation = (Operation)node.Value;
bool isAtomic = operation.Inst.IsAtomic();
bool isStg16Or8 = operation.Inst == Instruction.StoreGlobal16 || operation.Inst == Instruction.StoreGlobal8;
bool isWrite = isAtomic || operation.Inst == Instruction.StoreGlobal || isStg16Or8;
config.SetUsedStorageBuffer(storageIndex, isWrite);
Operand[] sources = new Operand[operation.SourcesCount];
sources[0] = Const(storageIndex);
sources[1] = GetStorageOffset(block, node, config, storageIndex, operation.GetSource(0), isStg16Or8);
for (int index = 2; index < operation.SourcesCount; index++)
{
sources[index] = operation.GetSource(index);
}
Operation storageOp;
if (isAtomic)
{
Instruction inst = (operation.Inst & ~Instruction.MrMask) | Instruction.MrStorage;
storageOp = new Operation(inst, operation.Dest, sources);
}
else if (operation.Inst == Instruction.LoadGlobal)
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{
storageOp = new Operation(Instruction.LoadStorage, operation.Dest, sources);
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}
else
{
Instruction storeInst = operation.Inst switch
{
Instruction.StoreGlobal16 => Instruction.StoreStorage16,
Instruction.StoreGlobal8 => Instruction.StoreStorage8,
_ => Instruction.StoreStorage
};
storageOp = new Operation(storeInst, null, sources);
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}
for (int index = 0; index < operation.SourcesCount; index++)
{
operation.SetSource(index, null);
}
LinkedListNode<INode> oldNode = node;
node = node.List.AddBefore(node, storageOp);
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node.List.Remove(oldNode);
return node;
}
private static Operand GetStorageOffset(
BasicBlock block,
LinkedListNode<INode> node,
ShaderConfig config,
int storageIndex,
Operand addrLow,
bool isStg16Or8)
{
int baseAddressCbOffset = GetStorageCbOffset(config.Stage, storageIndex);
bool storageAligned = !(config.GpuAccessor.QueryHasUnalignedStorageBuffer() || config.GpuAccessor.QueryHostStorageBufferOffsetAlignment() > Constants.StorageAlignment);
(Operand byteOffset, int constantOffset) = storageAligned ?
GetStorageOffset(block, Utils.FindLastOperation(addrLow, block), baseAddressCbOffset) :
(null, 0);
if (byteOffset == null)
{
Operand baseAddrLow = Cbuf(0, baseAddressCbOffset);
Operand baseAddrTrunc = Local();
Operand alignMask = Const(-config.GpuAccessor.QueryHostStorageBufferOffsetAlignment());
Operation andOp = new Operation(Instruction.BitwiseAnd, baseAddrTrunc, baseAddrLow, alignMask);
node.List.AddBefore(node, andOp);
Operand offset = Local();
Operation subOp = new Operation(Instruction.Subtract, offset, addrLow, baseAddrTrunc);
node.List.AddBefore(node, subOp);
byteOffset = offset;
}
else if (constantOffset != 0)
{
Operand offset = Local();
Operation addOp = new Operation(Instruction.Add, offset, byteOffset, Const(constantOffset));
node.List.AddBefore(node, addOp);
byteOffset = offset;
}
if (byteOffset != null)
{
ReplaceAddressAlignment(node.List, addrLow, byteOffset, constantOffset);
}
if (isStg16Or8)
{
return byteOffset;
}
Operand wordOffset = Local();
Operation shrOp = new Operation(Instruction.ShiftRightU32, wordOffset, byteOffset, Const(2));
node.List.AddBefore(node, shrOp);
return wordOffset;
}
private static bool IsCb0Offset(Operand operand, int offset)
{
return operand.Type == OperandType.ConstantBuffer && operand.GetCbufSlot() == 0 && operand.GetCbufOffset() == offset;
}
private static void ReplaceAddressAlignment(LinkedList<INode> list, Operand address, Operand byteOffset, int constantOffset)
{
// When we emit 16/8-bit LDG, we add extra code to determine the address alignment.
// Eliminate the storage buffer base address from this too, leaving only the byte offset.
foreach (INode useNode in address.UseOps)
{
if (useNode is Operation op && op.Inst == Instruction.BitwiseAnd)
{
Operand src1 = op.GetSource(0);
Operand src2 = op.GetSource(1);
int addressIndex = -1;
if (src1 == address && src2.Type == OperandType.Constant && src2.Value == 3)
{
addressIndex = 0;
}
else if (src2 == address && src1.Type == OperandType.Constant && src1.Value == 3)
{
addressIndex = 1;
}
if (addressIndex != -1)
{
LinkedListNode<INode> node = list.Find(op);
// Add offset calculation before the use. Needs to be on the same block.
if (node != null)
{
Operand offset = Local();
Operation addOp = new Operation(Instruction.Add, offset, byteOffset, Const(constantOffset));
list.AddBefore(node, addOp);
op.SetSource(addressIndex, offset);
}
}
}
}
}
private static (Operand, int) GetStorageOffset(BasicBlock block, Operand address, int baseAddressCbOffset)
{
if (IsCb0Offset(address, baseAddressCbOffset))
{
// Direct offset: zero.
return (Const(0), 0);
}
(address, int constantOffset) = GetStorageConstantOffset(block, address);
address = Utils.FindLastOperation(address, block);
if (IsCb0Offset(address, baseAddressCbOffset))
{
// Only constant offset
return (Const(0), constantOffset);
}
if (!(address.AsgOp is Operation offsetAdd) || offsetAdd.Inst != Instruction.Add)
{
return (null, 0);
}
Operand src1 = offsetAdd.GetSource(0);
Operand src2 = Utils.FindLastOperation(offsetAdd.GetSource(1), block);
if (IsCb0Offset(src2, baseAddressCbOffset))
{
return (src1, constantOffset);
}
else if (IsCb0Offset(src1, baseAddressCbOffset))
{
return (src2, constantOffset);
}
return (null, 0);
}
private static (Operand, int) GetStorageConstantOffset(BasicBlock block, Operand address)
{
if (!(address.AsgOp is Operation offsetAdd) || offsetAdd.Inst != Instruction.Add)
{
return (address, 0);
}
Operand src1 = offsetAdd.GetSource(0);
Operand src2 = offsetAdd.GetSource(1);
if (src2.Type != OperandType.Constant)
{
return (address, 0);
}
return (src1, src2.Value);
}
private static LinkedListNode<INode> ReplaceLdgWithLdc(LinkedListNode<INode> node, ShaderConfig config, int storageIndex)
{
Operation operation = (Operation)node.Value;
Operand GetCbufOffset()
{
Operand addrLow = operation.GetSource(0);
Operand baseAddrLow = Cbuf(0, UbeBaseOffset + storageIndex * StorageDescSize);
Operand baseAddrTrunc = Local();
Operand alignMask = Const(-config.GpuAccessor.QueryHostStorageBufferOffsetAlignment());
Operation andOp = new Operation(Instruction.BitwiseAnd, baseAddrTrunc, baseAddrLow, alignMask);
node.List.AddBefore(node, andOp);
Operand byteOffset = Local();
Operand wordOffset = Local();
Operation subOp = new Operation(Instruction.Subtract, byteOffset, addrLow, baseAddrTrunc);
Operation shrOp = new Operation(Instruction.ShiftRightU32, wordOffset, byteOffset, Const(2));
node.List.AddBefore(node, subOp);
node.List.AddBefore(node, shrOp);
return wordOffset;
}
Operand[] sources = new Operand[operation.SourcesCount];
int cbSlot = UbeFirstCbuf + storageIndex;
sources[0] = Const(cbSlot);
sources[1] = GetCbufOffset();
config.SetUsedConstantBuffer(cbSlot);
for (int index = 2; index < operation.SourcesCount; index++)
{
sources[index] = operation.GetSource(index);
}
Operation ldcOp = new Operation(Instruction.LoadConstant, operation.Dest, sources);
for (int index = 0; index < operation.SourcesCount; index++)
{
operation.SetSource(index, null);
}
LinkedListNode<INode> oldNode = node;
node = node.List.AddBefore(node, ldcOp);
node.List.Remove(oldNode);
return node;
}
private static int SearchForStorageBase(BasicBlock block, Operand globalAddress, int sbStart, int sbEnd)
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{
globalAddress = Utils.FindLastOperation(globalAddress, block);
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if (globalAddress.Type == OperandType.ConstantBuffer)
{
return GetStorageIndex(globalAddress, sbStart, sbEnd);
}
Operation operation = globalAddress.AsgOp as Operation;
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if (operation == null || operation.Inst != Instruction.Add)
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{
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)
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{
operation = Utils.FindLastOperation(src1, block).AsgOp as Operation;
}
else
{
operation = Utils.FindLastOperation(src2, block).AsgOp as Operation;
}
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if (operation == null || operation.Inst != Instruction.Add)
{
return -1;
}
}
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for (int index = 0; index < operation.SourcesCount; index++)
{
Operand source = operation.GetSource(index);
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int storageIndex = GetStorageIndex(source, sbStart, sbEnd);
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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;
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}
}
return -1;
}
}
}