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Remove barrier on Intel if control flow is potentially divergent (#5044)

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* Remove barrier on Intel if control flow is potentially divergent

* Shader cache version bump
This commit is contained in:
gdkchan 2023-06-08 17:43:16 -03:00 • committed by GitHub
parent fe30c03cac
commit 2cdcfe46d8
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GPG key ID: 4AEE18F83AFDEB23
10 changed files with 64 additions and 8 deletions
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7
src/Ryujinx.Graphics.Shader/CodeGen/Spirv/CodeGenContext.cs
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@ -76,6 +76,9 @@ namespace Ryujinx.Graphics.Shader.CodeGen.Spirv
public SpirvDelegates Delegates { get; }
public bool IsMainFunction { get; private set; }
public bool MayHaveReturned { get; set; }
public CodeGenContext(
StructuredProgramInfo info,
ShaderConfig config,
@ -108,8 +111,10 @@ namespace Ryujinx.Graphics.Shader.CodeGen.Spirv
Delegates = new SpirvDelegates(this);
}
public void StartFunction()
public void StartFunction(bool isMainFunction)
{
IsMainFunction = isMainFunction;
MayHaveReturned = false;
_locals.Clear();
_localForArgs.Clear();
_funcArgs.Clear();

12
src/Ryujinx.Graphics.Shader/CodeGen/Spirv/Instructions.cs
View file

@ -242,6 +242,16 @@ namespace Ryujinx.Graphics.Shader.CodeGen.Spirv
private static OperationResult GenerateBarrier(CodeGenContext context, AstOperation operation)
{
// Barrier on divergent control flow paths may cause the GPU to hang,
// so skip emitting the barrier for those cases.
if (!context.Config.GpuAccessor.QueryHostSupportsShaderBarrierDivergence() &&
(context.CurrentBlock.Type != AstBlockType.Main || context.MayHaveReturned || !context.IsMainFunction))
{
context.Config.GpuAccessor.Log($"Shader has barrier on potentially divergent block, the barrier will be removed.");
return OperationResult.Invalid;
}
context.ControlBarrier(
context.Constant(context.TypeU32(), Scope.Workgroup),
context.Constant(context.TypeU32(), Scope.Workgroup),
@ -1092,6 +1102,8 @@ namespace Ryujinx.Graphics.Shader.CodeGen.Spirv
private static OperationResult GenerateReturn(CodeGenContext context, AstOperation operation)
{
context.MayHaveReturned = true;
if (operation.SourcesCount != 0)
{
context.ReturnValue(context.Get(context.CurrentFunction.ReturnType, operation.GetSource(0)));

2
src/Ryujinx.Graphics.Shader/CodeGen/Spirv/SpirvGenerator.cs
View file

@ -148,7 +148,7 @@ namespace Ryujinx.Graphics.Shader.CodeGen.Spirv
context.CurrentFunction = function;
context.AddFunction(spvFunc);
context.StartFunction();
context.StartFunction(isMainFunction: funcIndex == 0);
Declarations.DeclareParameters(context, function);