From 6b23a2c125b9c48b5ebea92716004ef68698bb0f Mon Sep 17 00:00:00 2001
From: gdkchan <gab.dark.100@gmail.com>
Date: Wed, 17 Apr 2019 20:57:08 -0300
Subject: New shader translator implementation (#654)

* Start implementing a new shader translator

* Fix shift instructions and a typo

* Small refactoring on StructuredProgram, move RemovePhis method to a separate class

* Initial geometry shader support

* Implement TLD4

* Fix -- There's no negation on FMUL32I

* Add constant folding and algebraic simplification optimizations, nits

* Some leftovers from constant folding

* Avoid cast for constant assignments

* Add a branch elimination pass, and misc small fixes

* Remove redundant branches, add expression propagation and other improvements on the code

* Small leftovers -- add missing break and continue, remove unused properties, other improvements

* Add null check to handle empty block cases on block visitor

* Add HADD2 and HMUL2 half float shader instructions

* Optimize pack/unpack sequences, some fixes related to half float instructions

* Add TXQ, TLD, TLDS and TLD4S shader texture instructions, and some support for bindless textures, some refactoring on codegen

* Fix copy paste mistake that caused RZ to be ignored on the AST instruction

* Add workaround for conditional exit, and fix half float instruction with constant buffer

* Add missing 0.0 source for TLDS.LZ variants

* Simplify the switch for TLDS.LZ

* Texture instructions related fixes

* Implement the HFMA instruction, and some misc. fixes

* Enable constant folding on UnpackHalf2x16 instructions

* Refactor HFMA to use OpCode* for opcode decoding rather than on the helper methods

* Remove the old shader translator

* Remove ShaderDeclInfo and other unused things

* Add dual vertex shader support

* Add ShaderConfig, used to pass shader type and maximum cbuffer size

* Move and rename some instruction enums

* Move texture instructions into a separate file

* Move operand GetExpression and locals management to OperandManager

* Optimize opcode decoding using a simple list and binary search

* Add missing condition for do-while on goto elimination

* Misc. fixes on texture instructions

* Simplify TLDS switch

* Address PR feedback, and a nit
---
 .../Shader/StructuredIr/PhiFunctions.cs            | 74 ++++++++++++++++++++++
 1 file changed, 74 insertions(+)
 create mode 100644 Ryujinx.Graphics/Shader/StructuredIr/PhiFunctions.cs

(limited to 'Ryujinx.Graphics/Shader/StructuredIr/PhiFunctions.cs')

diff --git a/Ryujinx.Graphics/Shader/StructuredIr/PhiFunctions.cs b/Ryujinx.Graphics/Shader/StructuredIr/PhiFunctions.cs
new file mode 100644
index 00000000..53391b62
--- /dev/null
+++ b/Ryujinx.Graphics/Shader/StructuredIr/PhiFunctions.cs
@@ -0,0 +1,74 @@
+using Ryujinx.Graphics.Shader.IntermediateRepresentation;
+using System.Collections.Generic;
+
+namespace Ryujinx.Graphics.Shader.StructuredIr
+{
+    static class PhiFunctions
+    {
+        public static void Remove(BasicBlock[] blocks)
+        {
+            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;
+
+                    if (!(node.Value is PhiNode phi))
+                    {
+                        node = nextNode;
+
+                        continue;
+                    }
+
+                    for (int index = 0; index < phi.SourcesCount; index++)
+                    {
+                        Operand src = phi.GetSource(index);
+
+                        BasicBlock srcBlock = phi.GetBlock(index);
+
+                        Operation copyOp = new Operation(Instruction.Copy, phi.Dest, src);
+
+                        AddBeforeBranch(srcBlock, copyOp);
+                    }
+
+                    block.Operations.Remove(node);
+
+                    node = nextNode;
+                }
+            }
+        }
+
+        private static void AddBeforeBranch(BasicBlock block, INode node)
+        {
+            INode lastOp = block.GetLastOp();
+
+            if (lastOp is Operation operation && IsControlFlowInst(operation.Inst))
+            {
+                block.Operations.AddBefore(block.Operations.Last, node);
+            }
+            else
+            {
+                block.Operations.AddLast(node);
+            }
+        }
+
+        private static bool IsControlFlowInst(Instruction inst)
+        {
+            switch (inst)
+            {
+                case Instruction.Branch:
+                case Instruction.BranchIfFalse:
+                case Instruction.BranchIfTrue:
+                case Instruction.Discard:
+                case Instruction.Return:
+                    return true;
+            }
+
+            return false;
+        }
+    }
+}
\ No newline at end of file
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