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Use a new approach for shader BRX targets (#2532)

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* Use a new approach for shader BRX targets

* Make shader cache actually work

* Improve the shader pattern matching a bit

* Extend LDC search to predecessor blocks, catches more cases

* Nit

* Only save the amount of constant buffer data actually used. Avoids crashes on partially mapped buffers

* Ignore Rd on predicate instructions, as they do not have a Rd register (catches more cases)
This commit is contained in:
gdkchan 2021-08-11 15:59:42 -03:00 committed by GitHub
parent 70f79e689b
commit d9d18439f6
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
12 changed files with 472 additions and 149 deletions
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51
Ryujinx.Graphics.Gpu/Shader/Cache/CacheCollection.cs
View file

@ -38,6 +38,11 @@ namespace Ryujinx.Graphics.Gpu.Shader.Cache
/// </summary>
RemoveManifestEntries,
/// <summary>
/// Remove entries from the hash manifest and save it, and also deletes the temporary file.
/// </summary>
RemoveManifestEntryAndTempFile,
/// <summary>
/// Flush temporary cache to archive.
/// </summary>
@ -116,6 +121,9 @@ namespace Ryujinx.Graphics.Gpu.Shader.Cache
/// </summary>
private ZipArchive _cacheArchive;
/// <summary>
/// Indicates if the cache collection supports modification.
/// </summary>
public bool IsReadOnly { get; }
/// <summary>
@ -264,6 +272,21 @@ namespace Ryujinx.Graphics.Gpu.Shader.Cache
}
}
/// <summary>
/// Remove given entry from the manifest and delete the temporary file.
/// </summary>
/// <param name="entry">Entry to remove from the manifest</param>
private void RemoveManifestEntryAndTempFile(Hash128 entry)
{
lock (_hashTable)
{
_hashTable.Remove(entry);
SaveManifest();
}
File.Delete(GenCacheTempFilePath(entry));
}
/// <summary>
/// Queue a task to flush temporary files to the archive on the worker.
/// </summary>
@ -440,6 +463,9 @@ namespace Ryujinx.Graphics.Gpu.Shader.Cache
case CacheFileOperation.RemoveManifestEntries:
RemoveManifestEntries((HashSet<Hash128>)task.Data);
break;
case CacheFileOperation.RemoveManifestEntryAndTempFile:
RemoveManifestEntryAndTempFile((Hash128)task.Data);
break;
case CacheFileOperation.FlushToArchive:
FlushToArchive();
break;
@ -472,7 +498,7 @@ namespace Ryujinx.Graphics.Gpu.Shader.Cache
{
if (IsReadOnly)
{
Logger.Warning?.Print(LogClass.Gpu, "Trying to add {keyHash} on a read-only cache, ignoring.");
Logger.Warning?.Print(LogClass.Gpu, $"Trying to add {keyHash} on a read-only cache, ignoring.");
return;
}
@ -521,7 +547,7 @@ namespace Ryujinx.Graphics.Gpu.Shader.Cache
{
if (IsReadOnly)
{
Logger.Warning?.Print(LogClass.Gpu, "Trying to replace {keyHash} on a read-only cache, ignoring.");
Logger.Warning?.Print(LogClass.Gpu, $"Trying to replace {keyHash} on a read-only cache, ignoring.");
return;
}
@ -540,6 +566,27 @@ namespace Ryujinx.Graphics.Gpu.Shader.Cache
});
}
/// <summary>
/// Removes a value at the given hash from the cache.
/// </summary>
/// <param name="keyHash">The hash of the value in the cache</param>
public void RemoveValue(ref Hash128 keyHash)
{
if (IsReadOnly)
{
Logger.Warning?.Print(LogClass.Gpu, $"Trying to remove {keyHash} on a read-only cache, ignoring.");
return;
}
// Only queue file change operations
_fileWriterWorkerQueue.Add(new CacheFileOperationTask
{
Type = CacheFileOperation.RemoveManifestEntryAndTempFile,
Data = keyHash
});
}
public void Dispose()
{
Dispose(true);

53
Ryujinx.Graphics.Gpu/Shader/Cache/CacheHelper.cs
View file

@ -371,11 +371,13 @@ namespace Ryujinx.Graphics.Gpu.Shader.Cache
/// <summary>
/// Create guest shader cache entries from the runtime contexts.
/// </summary>
/// <param name="memoryManager">The GPU memory manager in use</param>
/// <param name="channel">The GPU channel in use</param>
/// <param name="shaderContexts">The runtime contexts</param>
/// <returns>Guest shader cahe entries from the runtime contexts</returns>
public static GuestShaderCacheEntry[] CreateShaderCacheEntries(MemoryManager memoryManager, ReadOnlySpan<TranslatorContext> shaderContexts)
public static GuestShaderCacheEntry[] CreateShaderCacheEntries(GpuChannel channel, ReadOnlySpan<TranslatorContext> shaderContexts)
{
MemoryManager memoryManager = channel.MemoryManager;
int startIndex = shaderContexts.Length > 1 ? 1 : 0;
GuestShaderCacheEntry[] entries = new GuestShaderCacheEntry[shaderContexts.Length - startIndex];
@ -389,31 +391,66 @@ namespace Ryujinx.Graphics.Gpu.Shader.Cache
continue;
}
GpuAccessor gpuAccessor = context.GpuAccessor as GpuAccessor;
ulong cb1DataAddress;
int cb1DataSize = gpuAccessor?.Cb1DataSize ?? 0;
if (context.Stage == ShaderStage.Compute)
{
cb1DataAddress = channel.BufferManager.GetComputeUniformBufferAddress(1);
}
else
{
int stageIndex = context.Stage switch
{
ShaderStage.TessellationControl => 1,
ShaderStage.TessellationEvaluation => 2,
ShaderStage.Geometry => 3,
ShaderStage.Fragment => 4,
_ => 0
};
cb1DataAddress = channel.BufferManager.GetGraphicsUniformBufferAddress(stageIndex, 1);
}
int size = context.Size;
TranslatorContext translatorContext2 = i == 1 ? shaderContexts[0] : null;
int sizeA = translatorContext2 != null ? translatorContext2.Size : 0;
byte[] code = new byte[context.Size + sizeA];
byte[] code = new byte[size + cb1DataSize + sizeA];
memoryManager.GetSpan(context.Address, context.Size).CopyTo(code);
memoryManager.GetSpan(context.Address, size).CopyTo(code);
if (cb1DataAddress != 0 && cb1DataSize != 0)
{
memoryManager.Physical.GetSpan(cb1DataAddress, cb1DataSize).CopyTo(code.AsSpan().Slice(size, cb1DataSize));
}
if (translatorContext2 != null)
{
memoryManager.GetSpan(translatorContext2.Address, sizeA).CopyTo(code.AsSpan().Slice(context.Size, sizeA));
memoryManager.GetSpan(translatorContext2.Address, sizeA).CopyTo(code.AsSpan().Slice(size + cb1DataSize, sizeA));
}
GuestGpuAccessorHeader gpuAccessorHeader = CreateGuestGpuAccessorCache(context.GpuAccessor);
if (context.GpuAccessor is GpuAccessor)
if (gpuAccessor != null)
{
gpuAccessorHeader.TextureDescriptorCount = context.TextureHandlesForCache.Count;
}
GuestShaderCacheEntryHeader header = new GuestShaderCacheEntryHeader(context.Stage, context.Size, sizeA, gpuAccessorHeader);
GuestShaderCacheEntryHeader header = new GuestShaderCacheEntryHeader(
context.Stage,
size + cb1DataSize,
sizeA,
cb1DataSize,
gpuAccessorHeader);
GuestShaderCacheEntry entry = new GuestShaderCacheEntry(header, code);
if (context.GpuAccessor is GpuAccessor gpuAccessor)
if (gpuAccessor != null)
{
foreach (int textureHandle in context.TextureHandlesForCache)
{

10
Ryujinx.Graphics.Gpu/Shader/Cache/CacheManager.cs
View file

@ -114,6 +114,16 @@ namespace Ryujinx.Graphics.Gpu.Shader.Cache
_hostProgramCache.ReplaceValue(ref programCodeHash, data);
}
/// <summary>
/// Removes a shader program present in the program cache.
/// </summary>
/// <param name="programCodeHash">Target program code hash</param>
public void RemoveProgram(ref Hash128 programCodeHash)
{
_guestProgramCache.RemoveValue(ref programCodeHash);
_hostProgramCache.RemoveValue(ref programCodeHash);
}
/// <summary>
/// Get all guest program hashes.
/// </summary>

8
Ryujinx.Graphics.Gpu/Shader/Cache/Definition/GuestShaderCacheEntryHeader.cs
View file

@ -40,9 +40,9 @@ namespace Ryujinx.Graphics.Gpu.Shader.Cache.Definition
public int SizeA;
/// <summary>
/// Unused/reserved.
/// Constant buffer 1 data size.
/// </summary>
public int Reserved4;
public int Cb1DataSize;
/// <summary>
/// The header of the cached gpu accessor.
@ -55,12 +55,14 @@ namespace Ryujinx.Graphics.Gpu.Shader.Cache.Definition
/// <param name="stage">The stage of this shader</param>
/// <param name="size">The size of the code section</param>
/// <param name="sizeA">The size of the code2 section if present (Vertex A)</param>
/// <param name="cb1DataSize">Constant buffer 1 data size</param>
/// <param name="gpuAccessorHeader">The header of the cached gpu accessor</param>
public GuestShaderCacheEntryHeader(ShaderStage stage, int size, int sizeA, GuestGpuAccessorHeader gpuAccessorHeader) : this()
public GuestShaderCacheEntryHeader(ShaderStage stage, int size, int sizeA, int cb1DataSize, GuestGpuAccessorHeader gpuAccessorHeader) : this()
{
Stage = stage;
Size = size;
SizeA = sizeA;
Cb1DataSize = cb1DataSize;
GpuAccessorHeader = gpuAccessorHeader;
}
}

20
Ryujinx.Graphics.Gpu/Shader/CachedGpuAccessor.cs
View file

@ -11,6 +11,7 @@ namespace Ryujinx.Graphics.Gpu.Shader
{
private readonly GpuContext _context;
private readonly ReadOnlyMemory<byte> _data;
private readonly ReadOnlyMemory<byte> _cb1Data;
private readonly GuestGpuAccessorHeader _header;
private readonly Dictionary<int, GuestTextureDescriptor> _textureDescriptors;
@ -19,12 +20,19 @@ namespace Ryujinx.Graphics.Gpu.Shader
/// </summary>
/// <param name="context">GPU context</param>
/// <param name="data">The data of the shader</param>
/// <param name="cb1Data">The constant buffer 1 data of the shader</param>
/// <param name="header">The cache of the GPU accessor</param>
/// <param name="guestTextureDescriptors">The cache of the texture descriptors</param>
public CachedGpuAccessor(GpuContext context, ReadOnlyMemory<byte> data, GuestGpuAccessorHeader header, Dictionary<int, GuestTextureDescriptor> guestTextureDescriptors)
public CachedGpuAccessor(
GpuContext context,
ReadOnlyMemory<byte> data,
ReadOnlyMemory<byte> cb1Data,
GuestGpuAccessorHeader header,
Dictionary<int, GuestTextureDescriptor> guestTextureDescriptors)
{
_context = context;
_data = data;
_cb1Data = cb1Data;
_header = header;
_textureDescriptors = new Dictionary<int, GuestTextureDescriptor>();
@ -34,6 +42,16 @@ namespace Ryujinx.Graphics.Gpu.Shader
}
}
/// <summary>
/// Reads data from the constant buffer 1.
/// </summary>
/// <param name="offset">Offset in bytes to read from</param>
/// <returns>Value at the given offset</returns>
public uint ConstantBuffer1Read(int offset)
{
return MemoryMarshal.Cast<byte, uint>(_cb1Data.Span.Slice(offset))[0];
}
/// <summary>
/// Prints a log message.
/// </summary>

21
Ryujinx.Graphics.Gpu/Shader/GpuAccessor.cs
View file

@ -20,6 +20,8 @@ namespace Ryujinx.Graphics.Gpu.Shader
private readonly int _localMemorySize;
private readonly int _sharedMemorySize;
public int Cb1DataSize { get; private set; }
/// <summary>
/// Creates a new instance of the GPU state accessor for graphics shader translation.
/// </summary>
@ -67,6 +69,25 @@ namespace Ryujinx.Graphics.Gpu.Shader
_sharedMemorySize = sharedMemorySize;
}
/// <summary>
/// Reads data from the constant buffer 1.
/// </summary>
/// <param name="offset">Offset in bytes to read from</param>
/// <returns>Value at the given offset</returns>
public uint ConstantBuffer1Read(int offset)
{
if (Cb1DataSize < offset + 4)
{
Cb1DataSize = offset + 4;
}
ulong baseAddress = _compute
? _channel.BufferManager.GetComputeUniformBufferAddress(1)
: _channel.BufferManager.GetGraphicsUniformBufferAddress(_stageIndex, 1);
return _channel.MemoryManager.Physical.Read<uint>(baseAddress + (ulong)offset);
}
/// <summary>
/// Prints a log message.
/// </summary>

59
Ryujinx.Graphics.Gpu/Shader/ShaderCache.cs
View file

@ -38,7 +38,7 @@ namespace Ryujinx.Graphics.Gpu.Shader
/// <summary>
/// Version of the codegen (to be changed when codegen or guest format change).
/// </summary>
private const ulong ShaderCodeGenVersion = 2469;
private const ulong ShaderCodeGenVersion = 2530;
// Progress reporting helpers
private volatile int _shaderCount;
@ -112,7 +112,7 @@ namespace Ryujinx.Graphics.Gpu.Shader
int programIndex = 0;
List<ShaderCompileTask> activeTasks = new List<ShaderCompileTask>();
AutoResetEvent taskDoneEvent = new AutoResetEvent(false);
using AutoResetEvent taskDoneEvent = new AutoResetEvent(false);
// This thread dispatches tasks to do shader translation, and creates programs that OpenGL will link in the background.
// The program link status is checked in a non-blocking manner so that multiple shaders can be compiled at once.
@ -191,7 +191,14 @@ namespace Ryujinx.Graphics.Gpu.Shader
Task compileTask = Task.Run(() =>
{
IGpuAccessor gpuAccessor = new CachedGpuAccessor(_context, entry.Code, entry.Header.GpuAccessorHeader, entry.TextureDescriptors);
var binaryCode = new Memory<byte>(entry.Code);
var gpuAccessor = new CachedGpuAccessor(
_context,
binaryCode,
binaryCode.Slice(binaryCode.Length - entry.Header.Cb1DataSize),
entry.Header.GpuAccessorHeader,
entry.TextureDescriptors);
var options = new TranslationOptions(TargetLanguage.Glsl, TargetApi.OpenGL, DefaultFlags | TranslationFlags.Compute);
program = Translator.CreateContext(0, gpuAccessor, options).Translate(out shaderProgramInfo);
@ -199,12 +206,20 @@ namespace Ryujinx.Graphics.Gpu.Shader
task.OnTask(compileTask, (bool _, ShaderCompileTask task) =>
{
if (task.IsFaulted)
{
Logger.Warning?.Print(LogClass.Gpu, $"Host shader {key} is corrupted or incompatible, discarding...");
_cacheManager.RemoveProgram(ref key);
return true; // Exit early, the decoding step failed.
}
ShaderCodeHolder shader = new ShaderCodeHolder(program, shaderProgramInfo, entry.Code);
Logger.Info?.Print(LogClass.Gpu, $"Host shader {key} got invalidated, rebuilding from guest...");
// Compile shader and create program as the shader program binary got invalidated.
shader.HostShader = _context.Renderer.CompileShader(ShaderStage.Compute, shader.Program.Code);
shader.HostShader = _context.Renderer.CompileShader(ShaderStage.Compute, program.Code);
hostProgram = _context.Renderer.CreateProgram(new IShader[] { shader.HostShader }, null);
task.OnCompiled(hostProgram, (bool isNewProgramValid, ShaderCompileTask task) =>
@ -298,7 +313,14 @@ namespace Ryujinx.Graphics.Gpu.Shader
}
else
{
IGpuAccessor gpuAccessor = new CachedGpuAccessor(_context, entry.Code, entry.Header.GpuAccessorHeader, entry.TextureDescriptors);
var binaryCode = new Memory<byte>(entry.Code);
var gpuAccessor = new CachedGpuAccessor(
_context,
binaryCode,
binaryCode.Slice(binaryCode.Length - entry.Header.Cb1DataSize),
entry.Header.GpuAccessorHeader,
entry.TextureDescriptors);
var options = new TranslationOptions(TargetLanguage.Glsl, TargetApi.OpenGL, flags);
var options2 = new TranslationOptions(TargetLanguage.Glsl, TargetApi.OpenGL, flags | TranslationFlags.VertexA);
@ -310,7 +332,7 @@ namespace Ryujinx.Graphics.Gpu.Shader
}
// NOTE: Vertex B comes first in the shader cache.
byte[] code = entry.Code.AsSpan().Slice(0, entry.Header.Size).ToArray();
byte[] code = entry.Code.AsSpan().Slice(0, entry.Header.Size - entry.Header.Cb1DataSize).ToArray();
byte[] code2 = entry.Code.AsSpan().Slice(entry.Header.Size, entry.Header.SizeA).ToArray();
shaders[i] = new ShaderCodeHolder(program, shaderProgramInfo, code, code2);
@ -326,13 +348,22 @@ namespace Ryujinx.Graphics.Gpu.Shader
}
else
{
IGpuAccessor gpuAccessor = new CachedGpuAccessor(_context, entry.Code, entry.Header.GpuAccessorHeader, entry.TextureDescriptors);
var binaryCode = new Memory<byte>(entry.Code);
var gpuAccessor = new CachedGpuAccessor(
_context,
binaryCode,
binaryCode.Slice(binaryCode.Length - entry.Header.Cb1DataSize),
entry.Header.GpuAccessorHeader,
entry.TextureDescriptors);
var options = new TranslationOptions(TargetLanguage.Glsl, TargetApi.OpenGL, flags);
program = Translator.CreateContext(0, gpuAccessor, options, counts).Translate(out shaderProgramInfo);
}
shaders[i] = new ShaderCodeHolder(program, shaderProgramInfo, entry.Code);
byte[] code = entry.Code.AsSpan().Slice(0, entry.Header.Size - entry.Header.Cb1DataSize).ToArray();
shaders[i] = new ShaderCodeHolder(program, shaderProgramInfo, code);
}
shaderPrograms.Add(program);
@ -341,6 +372,14 @@ namespace Ryujinx.Graphics.Gpu.Shader
task.OnTask(compileTask, (bool _, ShaderCompileTask task) =>
{
if (task.IsFaulted)
{
Logger.Warning?.Print(LogClass.Gpu, $"Host shader {key} is corrupted or incompatible, discarding...");
_cacheManager.RemoveProgram(ref key);
return true; // Exit early, the decoding step failed.
}
// If the host program was rejected by the gpu driver or isn't in cache, try to build from program sources again.
if (!isHostProgramValid)
{
@ -537,7 +576,7 @@ namespace Ryujinx.Graphics.Gpu.Shader
isShaderCacheReadOnly = _cacheManager.IsReadOnly;
// Compute hash and prepare data for shader disk cache comparison.
shaderCacheEntries = CacheHelper.CreateShaderCacheEntries(channel.MemoryManager, shaderContexts);
shaderCacheEntries = CacheHelper.CreateShaderCacheEntries(channel, shaderContexts);
programCodeHash = CacheHelper.ComputeGuestHashFromCache(shaderCacheEntries);
}
@ -659,7 +698,7 @@ namespace Ryujinx.Graphics.Gpu.Shader
isShaderCacheReadOnly = _cacheManager.IsReadOnly;
// Compute hash and prepare data for shader disk cache comparison.
shaderCacheEntries = CacheHelper.CreateShaderCacheEntries(channel.MemoryManager, shaderContexts);
shaderCacheEntries = CacheHelper.CreateShaderCacheEntries(channel, shaderContexts);
programCodeHash = CacheHelper.ComputeGuestHashFromCache(shaderCacheEntries, tfd);
}

3
Ryujinx.Graphics.Gpu/Shader/ShaderCompileTask.cs
View file

@ -1,5 +1,4 @@
using Ryujinx.Graphics.GAL;
using System;
using System.Threading;
using System.Threading.Tasks;
@ -20,6 +19,8 @@ namespace Ryujinx.Graphics.Gpu.Shader
private ShaderCompileTaskCallback _action;
private AutoResetEvent _taskDoneEvent;
public bool IsFaulted => _programsTask.IsFaulted;
/// <summary>
/// Create a new shader compile task, with an event to signal whenever a subtask completes.
/// </summary>

36
Ryujinx.Graphics.Shader/Decoders/Block.cs
View file

@ -8,10 +8,38 @@ namespace Ryujinx.Graphics.Shader.Decoders
public ulong Address { get; set; }
public ulong EndAddress { get; set; }
public Block Next { get; set; }
public Block Branch { get; set; }
private Block _next;
private Block _branch;
public OpCodeBranchIndir BrIndir { get; set; }
public Block Next
{
get
{
return _next;
}
set
{
_next?.Predecessors.Remove(this);
value?.Predecessors.Add(this);
_next = value;
}
}
public Block Branch
{
get
{
return _branch;
}
set
{
_branch?.Predecessors.Remove(this);
value?.Predecessors.Add(this);
_branch = value;
}
}
public HashSet<Block> Predecessors { get; }
public List<OpCode> OpCodes { get; }
public List<OpCodePush> PushOpCodes { get; }
@ -20,6 +48,8 @@ namespace Ryujinx.Graphics.Shader.Decoders
{
Address = address;
Predecessors = new HashSet<Block>();
OpCodes = new List<OpCode>();
PushOpCodes = new List<OpCodePush>();
}

207
Ryujinx.Graphics.Shader/Decoders/Decoder.cs
View file

@ -9,8 +9,6 @@ namespace Ryujinx.Graphics.Shader.Decoders
{
static class Decoder
{
public const ulong ShaderEndDelimiter = 0xe2400fffff87000f;
public static Block[][] Decode(IGpuAccessor gpuAccessor, ulong startAddress, out bool hasBindless)
{
hasBindless = false;
@ -51,6 +49,10 @@ namespace Ryujinx.Graphics.Shader.Decoders
GetBlock(funcAddress);
bool hasNewTarget;
do
{
while (workQueue.TryDequeue(out Block currBlock))
{
// Check if the current block is inside another block.
@ -117,22 +119,6 @@ namespace Ryujinx.Graphics.Shader.Decoders
currBlock.Branch = GetBlock(opBr.GetAbsoluteAddress());
}
}
else if (lastOp is OpCodeBranchIndir opBrIndir)
{
// An indirect branch could go anywhere, we don't know the target.
// Those instructions are usually used on a switch to jump table
// compiler optimization, and in those cases the possible targets
// seems to be always right after the BRX itself. We can assume
// that the possible targets are all the blocks in-between the
// instruction right after the BRX, and the common target that
// all the "cases" should eventually jump to, acting as the
// switch break.
Block firstTarget = GetBlock(currBlock.EndAddress);
firstTarget.BrIndir = opBrIndir;
opBrIndir.PossibleTargets.Add(firstTarget);
}
if (!IsUnconditionalBranch(lastOp))
{
@ -151,23 +137,9 @@ namespace Ryujinx.Graphics.Shader.Decoders
{
blocks.Add(currBlock);
}
// Do we have a block after the current one?
if (currBlock.BrIndir != null && HasBlockAfter(gpuAccessor, currBlock, startAddress))
{
bool targetVisited = visited.ContainsKey(currBlock.EndAddress);
Block possibleTarget = GetBlock(currBlock.EndAddress);
currBlock.BrIndir.PossibleTargets.Add(possibleTarget);
if (!targetVisited)
{
possibleTarget.BrIndir = currBlock.BrIndir;
}
}
}
// Propagate SSY/PBK addresses into their uses (SYNC/BRK).
foreach (Block block in blocks.Where(x => x.PushOpCodes.Count != 0))
{
for (int pushOpIndex = 0; pushOpIndex < block.PushOpCodes.Count; pushOpIndex++)
@ -176,25 +148,47 @@ namespace Ryujinx.Graphics.Shader.Decoders
}
}
// Try to find target for BRX (indirect branch) instructions.
hasNewTarget = false;
foreach (Block block in blocks)
{
if (block.GetLastOp() is OpCodeBranchIndir opBrIndir && opBrIndir.PossibleTargets.Count == 0)
{
ulong baseOffset = opBrIndir.Address + 8 + (ulong)opBrIndir.Offset;
// An indirect branch could go anywhere,
// try to get the possible target offsets from the constant buffer.
(int cbBaseOffset, int cbOffsetsCount) = FindBrxTargetRange(block, opBrIndir.Ra.Index);
if (cbOffsetsCount != 0)
{
hasNewTarget = true;
}
for (int i = 0; i < cbOffsetsCount; i++)
{
uint targetOffset = gpuAccessor.ConstantBuffer1Read(cbBaseOffset + i * 4);
Block target = GetBlock(baseOffset + targetOffset);
opBrIndir.PossibleTargets.Add(target);
target.Predecessors.Add(block);
}
}
}
// If we discovered new branch targets from the BRX instruction,
// we need another round of decoding to decode the new blocks.
// Additionally, we may have more SSY/PBK targets to propagate,
// and new BRX instructions.
}
while (hasNewTarget);
funcs.Add(blocks.ToArray());
}
return funcs.ToArray();
}
private static bool HasBlockAfter(IGpuAccessor gpuAccessor, Block currBlock, ulong startAdddress)
{
if (!gpuAccessor.MemoryMapped(startAdddress + currBlock.EndAddress) ||
!gpuAccessor.MemoryMapped(startAdddress + currBlock.EndAddress + 7))
{
return false;
}
ulong inst = gpuAccessor.MemoryRead<ulong>(startAdddress + currBlock.EndAddress);
return inst != 0UL && inst != ShaderEndDelimiter;
}
private static bool BinarySearch(List<Block> blocks, ulong address, out int index)
{
index = 0;
@ -320,6 +314,115 @@ namespace Ryujinx.Graphics.Shader.Decoders
opCode is OpCodeExit;
}
private static (int, int) FindBrxTargetRange(Block block, int brxReg)
{
// Try to match the following pattern:
//
// IMNMX.U32 Rx, Rx, UpperBound, PT
// SHL Rx, Rx, 0x2
// LDC Rx, c[0x1][Rx+BaseOffset]
//
// Here, Rx is an arbitrary register, "UpperBound" and "BaseOffset" are constants.
// The above pattern is assumed to be generated by the compiler before BRX,
// as the instruction is usually used to implement jump tables for switch statement optimizations.
// On a successful match, "BaseOffset" is the offset in bytes where the jump offsets are
// located on the constant buffer, and "UpperBound" is the total number of offsets for the BRX, minus 1.
HashSet<Block> visited = new HashSet<Block>();
var ldcLocation = FindFirstRegWrite(visited, new BlockLocation(block, block.OpCodes.Count - 1), brxReg);
if (ldcLocation.Block == null || ldcLocation.Block.OpCodes[ldcLocation.Index] is not OpCodeLdc opLdc)
{
return (0, 0);
}
if (opLdc.Slot != 1 || opLdc.IndexMode != CbIndexMode.Default)
{
return (0, 0);
}
var shlLocation = FindFirstRegWrite(visited, ldcLocation, opLdc.Ra.Index);
if (shlLocation.Block == null || shlLocation.Block.OpCodes[shlLocation.Index] is not OpCodeAluImm opShl)
{
return (0, 0);
}
if (opShl.Emitter != InstEmit.Shl || opShl.Immediate != 2)
{
return (0, 0);
}
var imnmxLocation = FindFirstRegWrite(visited, shlLocation, opShl.Ra.Index);
if (imnmxLocation.Block == null || imnmxLocation.Block.OpCodes[imnmxLocation.Index] is not OpCodeAluImm opImnmx)
{
return (0, 0);
}
bool isImnmxS32 = opImnmx.RawOpCode.Extract(48);
if (opImnmx.Emitter != InstEmit.Imnmx || isImnmxS32 || !opImnmx.Predicate39.IsPT || opImnmx.InvertP)
{
return (0, 0);
}
return (opLdc.Offset, opImnmx.Immediate + 1);
}
private struct BlockLocation
{
public Block Block { get; }
public int Index { get; }
public BlockLocation(Block block, int index)
{
Block = block;
Index = index;
}
}
private static BlockLocation FindFirstRegWrite(HashSet<Block> visited, BlockLocation location, int regIndex)
{
Queue<BlockLocation> toVisit = new Queue<BlockLocation>();
toVisit.Enqueue(location);
visited.Add(location.Block);
while (toVisit.TryDequeue(out var currentLocation))
{
Block block = currentLocation.Block;
for (int i = currentLocation.Index - 1; i >= 0; i--)
{
if (WritesToRegister(block.OpCodes[i], regIndex))
{
return new BlockLocation(block, i);
}
}
foreach (Block predecessor in block.Predecessors)
{
if (visited.Add(predecessor))
{
toVisit.Enqueue(new BlockLocation(predecessor, predecessor.OpCodes.Count));
}
}
}
return new BlockLocation(null, 0);
}
private static bool WritesToRegister(OpCode opCode, int regIndex)
{
// Predicate instruction only ever writes to predicate, so we shouldn't check those.
if (opCode.Emitter == InstEmit.Fsetp ||
opCode.Emitter == InstEmit.Hsetp2 ||
opCode.Emitter == InstEmit.Isetp ||
opCode.Emitter == InstEmit.R2p)
{
return false;
}
return opCode is IOpCodeRd opRd && opRd.Rd.Index == regIndex;
}
private enum MergeType
{
Brk = 0,
@ -388,6 +491,8 @@ namespace Ryujinx.Graphics.Shader.Decoders
{
OpCodePush pushOp = currBlock.PushOpCodes[pushOpIndex];
Block target = blocks[pushOp.GetAbsoluteAddress()];
Stack<PathBlockState> workQueue = new Stack<PathBlockState>();
HashSet<Block> visited = new HashSet<Block>();
@ -497,10 +602,12 @@ namespace Ryujinx.Graphics.Shader.Decoders
if (branchStack.Count == 0)
{
// If the entire stack was consumed, then the current pop instruction
// just consumed the address from out push instruction.
op.Targets.Add(pushOp, op.Targets.Count);
pushOp.PopOps.TryAdd(op, Local());
// just consumed the address from our push instruction.
if (op.Targets.TryAdd(pushOp, op.Targets.Count))
{
pushOp.PopOps.Add(op, Local());
target.Predecessors.Add(current);
}
}
else
{

5
Ryujinx.Graphics.Shader/IGpuAccessor.cs
View file

@ -7,6 +7,11 @@
// No default log output.
}
uint ConstantBuffer1Read(int offset)
{
return 0;
}
T MemoryRead<T>(ulong address) where T : unmanaged;
bool MemoryMapped(ulong address)

6
Ryujinx.Graphics.Shader/Instructions/InstEmitFlow.cs
View file

@ -25,6 +25,12 @@ namespace Ryujinx.Graphics.Shader.Instructions
{
OpCodeBranchIndir op = (OpCodeBranchIndir)context.CurrOp;
if (op.PossibleTargets.Count == 0)
{
context.Config.GpuAccessor.Log($"Failed to find targets for BRX instruction at 0x{op.Address:X}.");
return;
}
int offset = (int)op.Address + 8 + op.Offset;
Operand address = context.IAdd(Register(op.Ra), Const(offset));