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https://github.com/Ryujinx/Ryujinx.git
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* Implement JIT Arm64 backend * PPTC version bump * Address some feedback from Arm64 JIT PR * Address even more PR feedback * Remove unused IsPageAligned function * Sync Qc flag before calls * Fix comment and remove unused enum * Address riperiperi PR feedback * Delete Breakpoint IR instruction that was only implemented for Arm64
252 lines
8.1 KiB
C#
252 lines
8.1 KiB
C#
using ARMeilleure.IntermediateRepresentation;
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using ARMeilleure.Translation;
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using System;
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using System.Diagnostics;
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using static ARMeilleure.IntermediateRepresentation.Operand.Factory;
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namespace ARMeilleure.CodeGen.Optimizations
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{
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static class Optimizer
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{
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public static void RunPass(ControlFlowGraph cfg)
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{
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// Scratch buffer used to store uses.
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Span<Operation> buffer = default;
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bool modified;
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do
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{
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modified = false;
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for (BasicBlock block = cfg.Blocks.Last; block != null; block = block.ListPrevious)
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{
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Operation node;
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Operation prevNode;
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for (node = block.Operations.Last; node != default; node = prevNode)
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{
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prevNode = node.ListPrevious;
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if (IsUnused(node))
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{
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RemoveNode(block, node);
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modified = true;
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continue;
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}
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else if (node.Instruction == Instruction.Phi)
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{
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continue;
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}
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ConstantFolding.RunPass(node);
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Simplification.RunPass(node);
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if (DestIsSingleLocalVar(node))
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{
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if (IsPropagableCompare(node))
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{
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modified |= PropagateCompare(ref buffer, node);
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if (modified && IsUnused(node))
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{
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RemoveNode(block, node);
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}
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}
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else if (IsPropagableCopy(node))
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{
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PropagateCopy(ref buffer, node);
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RemoveNode(block, node);
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modified = true;
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}
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}
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}
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}
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}
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while (modified);
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}
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public static void RemoveUnusedNodes(ControlFlowGraph cfg)
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{
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bool modified;
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do
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{
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modified = false;
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for (BasicBlock block = cfg.Blocks.Last; block != null; block = block.ListPrevious)
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{
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Operation node;
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Operation prevNode;
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for (node = block.Operations.Last; node != default; node = prevNode)
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{
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prevNode = node.ListPrevious;
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if (IsUnused(node))
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{
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RemoveNode(block, node);
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modified = true;
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}
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}
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}
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}
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while (modified);
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}
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private static bool PropagateCompare(ref Span<Operation> buffer, Operation compOp)
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{
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// Try to propagate Compare operations into their BranchIf uses, when these BranchIf uses are in the form
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// of:
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//
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// - BranchIf %x, 0x0, Equal ;; i.e BranchIfFalse %x
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// - BranchIf %x, 0x0, NotEqual ;; i.e BranchIfTrue %x
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//
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// The commutative property of Equal and NotEqual is taken into consideration as well.
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//
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// For example:
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//
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// %x = Compare %a, %b, comp
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// BranchIf %x, 0x0, NotEqual
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//
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// =>
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//
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// BranchIf %a, %b, comp
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static bool IsZeroBranch(Operation operation, out Comparison compType)
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{
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compType = Comparison.Equal;
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if (operation.Instruction != Instruction.BranchIf)
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{
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return false;
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}
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Operand src1 = operation.GetSource(0);
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Operand src2 = operation.GetSource(1);
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Operand comp = operation.GetSource(2);
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compType = (Comparison)comp.AsInt32();
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return (src1.Kind == OperandKind.Constant && src1.Value == 0) ||
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(src2.Kind == OperandKind.Constant && src2.Value == 0);
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}
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bool modified = false;
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Operand dest = compOp.Destination;
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Operand src1 = compOp.GetSource(0);
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Operand src2 = compOp.GetSource(1);
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Operand comp = compOp.GetSource(2);
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Comparison compType = (Comparison)comp.AsInt32();
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Span<Operation> uses = dest.GetUses(ref buffer);
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foreach (Operation use in uses)
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{
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// If operation is a BranchIf and has a constant value 0 in its RHS or LHS source operands.
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if (IsZeroBranch(use, out Comparison otherCompType))
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{
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Comparison propCompType;
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if (otherCompType == Comparison.NotEqual)
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{
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propCompType = compType;
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}
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else if (otherCompType == Comparison.Equal)
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{
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propCompType = compType.Invert();
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}
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else
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{
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continue;
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}
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use.SetSource(0, src1);
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use.SetSource(1, src2);
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use.SetSource(2, Const((int)propCompType));
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modified = true;
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}
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}
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return modified;
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}
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private static void PropagateCopy(ref Span<Operation> buffer, Operation copyOp)
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{
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// Propagate copy source operand to all uses of the destination operand.
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Operand dest = copyOp.Destination;
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Operand source = copyOp.GetSource(0);
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Span<Operation> uses = dest.GetUses(ref buffer);
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foreach (Operation use in uses)
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{
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for (int index = 0; index < use.SourcesCount; index++)
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{
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if (use.GetSource(index) == dest)
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{
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use.SetSource(index, source);
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}
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}
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}
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}
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private static void RemoveNode(BasicBlock block, Operation node)
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{
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// Remove a node from the nodes list, and also remove itself
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// from all the use lists on the operands that this node uses.
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block.Operations.Remove(node);
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for (int index = 0; index < node.SourcesCount; index++)
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{
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node.SetSource(index, default);
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}
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Debug.Assert(node.Destination == default || node.Destination.UsesCount == 0);
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node.Destination = default;
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}
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private static bool IsUnused(Operation node)
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{
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return DestIsSingleLocalVar(node) && node.Destination.UsesCount == 0 && !HasSideEffects(node);
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}
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private static bool DestIsSingleLocalVar(Operation node)
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{
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return node.DestinationsCount == 1 && node.Destination.Kind == OperandKind.LocalVariable;
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}
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private static bool HasSideEffects(Operation node)
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{
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return node.Instruction == Instruction.Call
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|| node.Instruction == Instruction.Tailcall
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|| node.Instruction == Instruction.CompareAndSwap
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|| node.Instruction == Instruction.CompareAndSwap16
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|| node.Instruction == Instruction.CompareAndSwap8;
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}
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private static bool IsPropagableCompare(Operation operation)
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{
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return operation.Instruction == Instruction.Compare;
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}
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private static bool IsPropagableCopy(Operation operation)
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{
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if (operation.Instruction != Instruction.Copy)
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{
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return false;
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}
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return operation.Destination.Type == operation.GetSource(0).Type;
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}
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}
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} |