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[ShaderCompiler] Skip EXEC selects for vector writes no lane observes

This commit is contained in:
ParantezTech 2026-10-11 01:35:27 +03:00
parent d24f6c6a85
commit 84c830f7ce
1 changed files with 23 additions and 1 deletions
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24
src/SharpEmu.ShaderCompiler.Vulkan/Gen5SpirvTranslator.cs
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@ -1420,10 +1420,12 @@ public static partial class Gen5SpirvTranslator
}
_execKnownFull = IsExecKnownFull(instruction.Pc);
_unobservedWrites = ObservationPlan()?.UnobservedWrites(instruction.Pc) ?? default;
var emitted = _pairedLanes && IsPairedLaneInstruction(instruction)
? TryEmitPairedLaneInstruction(instruction, out error)
: TryEmitInstruction(instruction, out error);
_execKnownFull = false;
_unobservedWrites = default;
if (!emitted)
{
error = $"pc=0x{instruction.Pc:X} {instruction.Opcode}: {error}";
@ -7719,9 +7721,29 @@ public static partial class Gen5SpirvTranslator
return _execFullPcs.Contains(pc);
}
private static readonly bool ExecSelectElimination = !string.Equals(
Environment.GetEnvironmentVariable("SHARPEMU_EXEC_SELECT_ELIMINATION"), "0", StringComparison.Ordinal);
private Ir.VectorRegisterSet _unobservedWrites;
private Ir.Gen5VectorObservationPlan? _observationPlan;
private bool _observationPlanBuilt;
private Ir.Gen5VectorObservationPlan? ObservationPlan()
{
if (!_observationPlanBuilt)
{
_observationPlanBuilt = true;
_observationPlan = ExecSelectElimination
? Ir.Gen5VectorObservationAnalysis.Analyze(_request.Program, wave32: _waveLaneCount == 32)
: null;
}
return _observationPlan;
}
private void StoreV(uint register, uint value, bool guardWithExec = true)
{
if (guardWithExec && !_execKnownFull)
if (guardWithExec && !_execKnownFull && !_unobservedWrites.Contains(register))
{
var active = Load(_boolType, _exec);
var oldValue = LoadV(register);