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shader: disable DPP16 writes from EXEC-disabled sources without BOUND_CTRL

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nmzik
2026-10-25 01:29:02 +02:00
parent 67c89e0915
commit 9a20c6f738
2 changed files with 69 additions and 17 deletions
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src/graphics/shader/recompiler/backend/spirv/spirvEmitterFlow.cpp
+17 -2
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@@ -147,9 +147,24 @@ uint32_t EmitDppWriteCondition(ValueEmitContext& ctx, const IR::DppMoveFlags& fl
// Only row shifts (0x101-0x10f, 0x111-0x11f) can vacate a lane; other controls always read one.
const bool row_shift = flags.control > 0x100u && flags.control < 0x120u &&
flags.control != 0x110u;
if (!flags.bound_control && row_shift) {
if (flags.bound_control || (flags.fetch_inactive && !row_shift)) {
return writable;
}
// Without BOUND_CTRL, a vacated source or, without FI, an EXEC-disabled one disables the write.
const auto target = EmitDppTargetLane(state, flags);
if (row_shift) {
writable = Binary(state, spv::OpLogicalAnd, TypeBool(state), writable, target.valid);
}
if (!flags.fetch_inactive) {
// Vacated lanes target outside their row; wrapping keeps the ballot index in range.
auto source = target.lane;
if (row_shift) {
lane = lane != 0 ? lane : EmitSubgroupLocalInvocationId(state);
source = EmitNative<spv::OpBitFieldInsert, IR::Type::U32>(
state, lane, source, ConstantU32(state, 0), ConstantU32(state, 4));
}
writable = Binary(state, spv::OpLogicalAnd, TypeBool(state), writable,
EmitDppTargetLane(state, flags).valid);
EmitSourceLaneActive(ctx, exec, source));
}
return writable;
}