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shader: prove descriptor bounds from simplified image EXEC predicates

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This commit is contained in:
nmzik
2026-10-13 00:22:23 +02:00
parent 25e1cc7ec9
commit ed1195d1e7
4 changed files with 231 additions and 84 deletions
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src/graphics/shader/recompiler/ir/passes/ResourceTracking.cpp
+24 -4
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@@ -1656,9 +1656,10 @@ private:
const auto op = test->GetOpcode();
if (op == ValueOpcode::LogicalNot)
return UnsignedBound(test->Arg(0), value, !positive);
if (op == ValueOpcode::LogicalAnd && positive) {
const auto left = UnsignedBound(test->Arg(0), value);
return left.IsEmpty() ? UnsignedBound(test->Arg(1), value) : left;
if ((op == ValueOpcode::LogicalAnd && positive) ||
(op == ValueOpcode::LogicalOr && !positive)) {
const auto left = UnsignedBound(test->Arg(0), value, positive);
return left.IsEmpty() ? UnsignedBound(test->Arg(1), value, positive) : left;
}
if ((positive ? op == ValueOpcode::ULessThan32 : op == ValueOpcode::UGreaterThanEqual32) &&
EquivalentValue(m_program, test->Arg(0), value)) return test->Arg(1);
@@ -1684,6 +1685,24 @@ private:
return guarded ? bound : Value {};
}
Value UnsignedImageBound(Value key, const Inst& handle) const {
Value bound;
for (const auto& use: handle.Uses()) {
const auto& image = *use.user;
const auto op = image.GetOpcode();
if (use.operand != 0u || (op != ValueOpcode::ImageSampleRaw &&
op != ValueOpcode::ImageGatherRaw && op != ValueOpcode::ImageRead)) return {};
// The image's own EXEC predicate proves the range for every accessing lane;
// an EXEC-nonzero branch alone only proves that some lane is active.
const auto candidate = UnsignedBound(image.Arg(image.NumArgs() - 1u), key);
if (candidate.IsEmpty() ||
!ValidateRuntimeValue(m_program, candidate, RuntimeValueType::Integer)) return {};
if (bound.IsEmpty()) bound = candidate;
else if (!EquivalentValue(m_program, candidate, bound)) return {};
}
return bound;
}
Value SharedLoadBound(Value value, Value active) {
const auto* read = ActiveValue(value, active).TryInstruction();
if (read == nullptr || read->GetOpcode() != ValueOpcode::LoadSharedU32 ||
@@ -2417,7 +2436,8 @@ private:
// the GPU key using the same plan as other indirect image reads.
plan.retain_reads |= table_source.dword_count == 4u;
} else if (table_source.dword_count == 2u) {
const auto guarded_count = UnsignedBoundOnEntry(key, handle.Parent());
auto guarded_count = UnsignedBoundOnEntry(key, handle.Parent());
if (guarded_count.IsEmpty()) guarded_count = UnsignedImageBound(key, handle);
const auto* selector = key.Resolve().TryInstruction();
const bool bitscan = guarded_count.IsEmpty() && selector != nullptr &&
selector->GetOpcode() == ValueOpcode::FindILsb32 &&