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);
}
public static void RunPass(BasicBlock[] blocks, ShaderConfig config)
{
for (int blkIndex = 0; blkIndex < blocks.Length; blkIndex++)
{
GlobalToStorage.RunPass(blocks[blkIndex], config);
}
bool modified;
do
{
modified = false;
for (int blkIndex = 0; blkIndex < blocks.Length; blkIndex++)
{
BasicBlock block = blocks[blkIndex];
LinkedListNode <INode> node = block.Operations.First;
while (node != null)
{
LinkedListNode <INode> nextNode = node.Next;
bool isUnused = IsUnused(node.Value);
if (!(node.Value is Operation operation) || isUnused)
{
if (isUnused)
{
RemoveNode(block, node);
modified = true;
}
node = nextNode;
continue;
}
ConstantFolding.RunPass(operation);
Simplification.RunPass(operation);
if (DestIsLocalVar(operation))
{
if (operation.Inst == Instruction.Copy)
{
PropagateCopy(operation);
RemoveNode(block, node);
modified = true;
}
else if ((operation.Inst == Instruction.PackHalf2x16 && PropagatePack(operation)) ||
(operation.Inst == Instruction.ShuffleXor && MatchDdxOrDdy(operation)))
{
if (operation.Dest.UseOps.Count == 0)
{
RemoveNode(block, node);
}
modified = true;
}
}
node = nextNode;
}
if (BranchElimination.RunPass(block))
{
RemoveNode(block, block.Operations.Last);
modified = true;
}
}
}while (modified);
for (int blkIndex = 0; blkIndex < blocks.Length; blkIndex++)
{
BindlessToIndexed.RunPass(blocks[blkIndex]);
BindlessElimination.RunPass(blocks[blkIndex]);
// 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;
}
}
}