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using Ryujinx.Graphics.Shader.IntermediateRepresentation;
using System.Collections.Generic;
namespace Ryujinx.Graphics.Shader.Translation.Optimizations
{
static class Utils
{
public static bool IsInputLoad(INode node)
{
return (node is Operation operation) &&
operation.Inst == Instruction.Load &&
operation.StorageKind == StorageKind.Input;
}
public static bool IsInputLoad(INode node, IoVariable ioVariable, int elemIndex)
{
if (node is not Operation operation ||
operation.Inst != Instruction.Load ||
operation.StorageKind != StorageKind.Input ||
operation.SourcesCount != 2)
{
return false;
}
Operand ioVariableSrc = operation.GetSource(0);
if (ioVariableSrc.Type != OperandType.Constant || (IoVariable)ioVariableSrc.Value != ioVariable)
{
return false;
}
Operand elemIndexSrc = operation.GetSource(1);
return elemIndexSrc.Type == OperandType.Constant && elemIndexSrc.Value == elemIndex;
}
private static bool IsSameOperand(Operand x, Operand y)
{
if (x.Type != y.Type || x.Value != y.Value)
{
return false;
}
// TODO: Handle Load operations with the same storage and the same constant parameters.
return x == y || x.Type == OperandType.Constant || x.Type == OperandType.ConstantBuffer;
}
private static bool AreAllSourcesEqual(INode node, INode otherNode)
{
if (node.SourcesCount != otherNode.SourcesCount)
{
return false;
}
for (int index = 0; index < node.SourcesCount; index++)
{
if (!IsSameOperand(node.GetSource(index), otherNode.GetSource(index)))
{
return false;
}
}
return true;
}
public static bool AreAllSourcesTheSameOperand(INode node)
{
Operand firstSrc = node.GetSource(0);
for (int index = 1; index < node.SourcesCount; index++)
{
if (!IsSameOperand(firstSrc, node.GetSource(index)))
{
return false;
}
}
return true;
}
private static Operation FindBranchSource(BasicBlock block)
{
foreach (BasicBlock sourceBlock in block.Predecessors)
{
if (sourceBlock.Operations.Count > 0)
{
if (sourceBlock.GetLastOp() is Operation lastOp && IsConditionalBranch(lastOp.Inst) && sourceBlock.Next == block)
{
return lastOp;
}
}
}
return null;
}
private static bool IsConditionalBranch(Instruction inst)
{
return inst == Instruction.BranchIfFalse || inst == Instruction.BranchIfTrue;
}
private static bool IsSameCondition(Operand currentCondition, Operand queryCondition)
{
if (currentCondition == queryCondition)
{
return true;
}
return currentCondition.AsgOp is Operation currentOperation &&
queryCondition.AsgOp is Operation queryOperation &&
currentOperation.Inst == queryOperation.Inst &&
AreAllSourcesEqual(currentOperation, queryOperation);
}
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 &&
IsSameCondition(currentCondition, queryCondition);
}
public static Operand FindLastOperation(Operand source, BasicBlock block, bool recurse = true)
{
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);
Operand phiSource = phiNode.GetSource(i);
if (BlockConditionsMatch(block, phiBlock))
{
return phiSource;
}
else if (recurse && phiSource.AsgOp is PhiNode)
{
// Phi source is another phi.
// Let's check if that phi has a block that matches our condition.
Operand match = FindLastOperation(phiSource, block, false);
if (match != phiSource)
{
return match;
}
}
}
}
return source;
}
public static void DeleteNode(LinkedListNode<INode> node, Operation operation)
{
node.List.Remove(node);
for (int srcIndex = 0; srcIndex < operation.SourcesCount; srcIndex++)
{
operation.SetSource(srcIndex, null);
}
operation.Dest = null;
}
}
}
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