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
2019-04-17 20:57:08 -03:00 · 2019-04-17 20:57:08 -03:00 · 6b23a2c125
commit 6b23a2c125
parent b2e88b04a8
207 changed files with 11514 additions and 6311 deletions
--- a/Ryujinx.Graphics/Shader/Translation/Optimizations/BranchElimination.cs
+++ b/Ryujinx.Graphics/Shader/Translation/Optimizations/BranchElimination.cs
@ -0,0 +1,64 @@
+using Ryujinx.Graphics.Shader.IntermediateRepresentation;
+using System;
+
+namespace Ryujinx.Graphics.Shader.Translation.Optimizations
+{
+    static class BranchElimination
+    {
+        public static bool Eliminate(BasicBlock block)
+        {
+            if (block.HasBranch && IsRedundantBranch((Operation)block.GetLastOp(), Next(block)))
+            {
+                block.Branch = null;
+
+                return true;
+            }
+
+            return false;
+        }
+
+        private static bool IsRedundantBranch(Operation current, BasicBlock nextBlock)
+        {
+            //Here we check that:
+            //- The current block ends with a branch.
+            //- The next block only contains a branch.
+            //- The branch on the next block is unconditional.
+            //- Both branches are jumping to the same location.
+            //In this case, the branch on the current block can be removed,
+            //as the next block is going to jump to the same place anyway.
+            if (nextBlock == null)
+            {
+                return false;
+            }
+
+            if (!(nextBlock.Operations.First?.Value is Operation next))
+            {
+                return false;
+            }
+
+            if (next.Inst != Instruction.Branch)
+            {
+                return false;
+            }
+
+            return current.Dest == next.Dest;
+        }
+
+        private static BasicBlock Next(BasicBlock block)
+        {
+            block = block.Next;
+
+            while (block != null && block.Operations.Count == 0)
+            {
+                if (block.HasBranch)
+                {
+                    throw new InvalidOperationException("Found a bogus empty block that \"ends with a branch\".");
+                }
+
+                block = block.Next;
+            }
+
+            return block;
+        }
+    }
+}